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authorJim Jagielski <jim@apache.org>2012-11-09 17:41:12 +0100
committerJim Jagielski <jim@apache.org>2012-11-09 17:41:12 +0100
commit7c3e75bdd06b7b16e2167a4cd6b17c3502c95c38 (patch)
treec9d4f0a0a0b91de5652d97053e1157a98e22823f /server/mpm/eventopt
parentremove obsolete comment from 1.3 days (diff)
downloadapache2-7c3e75bdd06b7b16e2167a4cd6b17c3502c95c38.tar.xz
apache2-7c3e75bdd06b7b16e2167a4cd6b17c3502c95c38.zip
Pull the event optimization MPM back into trunk. This
provides more eyes and allows work to continue on it... git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1407533 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'server/mpm/eventopt')
-rw-r--r--server/mpm/eventopt/Makefile.in1
-rw-r--r--server/mpm/eventopt/config.m411
-rw-r--r--server/mpm/eventopt/config3.m411
-rw-r--r--server/mpm/eventopt/equeue.c125
-rw-r--r--server/mpm/eventopt/equeue.h50
-rw-r--r--server/mpm/eventopt/eventopt.c3328
-rw-r--r--server/mpm/eventopt/fdqueue.c507
-rw-r--r--server/mpm/eventopt/fdqueue.h104
-rw-r--r--server/mpm/eventopt/mpm_default.h56
-rw-r--r--server/mpm/eventopt/pod.c113
-rw-r--r--server/mpm/eventopt/pod.h59
11 files changed, 4365 insertions, 0 deletions
diff --git a/server/mpm/eventopt/Makefile.in b/server/mpm/eventopt/Makefile.in
new file mode 100644
index 0000000000..f34af9cbd6
--- /dev/null
+++ b/server/mpm/eventopt/Makefile.in
@@ -0,0 +1 @@
+include $(top_srcdir)/build/special.mk
diff --git a/server/mpm/eventopt/config.m4 b/server/mpm/eventopt/config.m4
new file mode 100644
index 0000000000..92f2789a38
--- /dev/null
+++ b/server/mpm/eventopt/config.m4
@@ -0,0 +1,11 @@
+AC_MSG_CHECKING(if eventopt MPM supports this platform)
+if test $forking_mpms_supported != yes; then
+ AC_MSG_RESULT(no - This is not a forking platform)
+elif test $ac_cv_define_APR_HAS_THREADS != yes; then
+ AC_MSG_RESULT(no - APR does not support threads)
+elif test $have_threaded_sig_graceful != yes; then
+ AC_MSG_RESULT(no - SIG_GRACEFUL cannot be used with a threaded MPM)
+else
+ AC_MSG_RESULT(yes)
+ APACHE_MPM_SUPPORTED(eventopt, yes, yes)
+fi
diff --git a/server/mpm/eventopt/config3.m4 b/server/mpm/eventopt/config3.m4
new file mode 100644
index 0000000000..dd05deba33
--- /dev/null
+++ b/server/mpm/eventopt/config3.m4
@@ -0,0 +1,11 @@
+dnl ## XXX - Need a more thorough check of the proper flags to use
+
+APACHE_CHECK_SERF
+if test "$ac_cv_serf" = yes ; then
+ APR_ADDTO(MOD_MPM_EVENTOPT_LDADD,[\$(SERF_LIBS)])
+fi
+APACHE_SUBST(MOD_MPM_EVENTOPT_LDADD)
+
+APACHE_MPM_MODULE(eventopt, $enable_mpm_eventopt, eventopt.lo fdqueue.lo equeue.lo pod.lo,[
+ AC_CHECK_FUNCS(pthread_kill)
+], , [\$(MOD_MPM_EVENTOPT_LDADD)])
diff --git a/server/mpm/eventopt/equeue.c b/server/mpm/eventopt/equeue.c
new file mode 100644
index 0000000000..4750ab1c53
--- /dev/null
+++ b/server/mpm/eventopt/equeue.c
@@ -0,0 +1,125 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "equeue.h"
+
+#include <apr_atomic.h>
+#include <sched.h>
+
+struct ap_equeue_t {
+ apr_uint32_t nelem;
+ apr_size_t elem_size;
+ uint8_t *bytes;
+ volatile apr_uint32_t writeCount;
+ volatile apr_uint32_t readCount;
+};
+
+
+static APR_INLINE apr_uint32_t count_to_index(ap_equeue_t *eq, apr_uint32_t count)
+{
+ return (count & (eq->nelem - 1));
+}
+
+static APR_INLINE void* index_to_bytes(ap_equeue_t *eq, apr_uint32_t idx)
+{
+ apr_size_t offset = idx * eq->elem_size;
+ return (void*)&eq->bytes[offset];
+}
+
+static APR_INLINE apr_uint32_t nearest_power(apr_uint32_t num)
+{
+ apr_uint32_t n = 1;
+ while (n < num) {
+ n <<= 1;
+ }
+
+ return n;
+}
+
+#if 0
+static void dump_queue(ap_equeue_t *eq)
+{
+ apr_uint32_t i;
+
+ fprintf(stderr, "dumping %p\n", eq);
+ fprintf(stderr, " nelem: %u\n", eq->nelem);
+ fprintf(stderr, " esize: %"APR_SIZE_T_FMT"\n", eq->elem_size);
+ fprintf(stderr, " wcnt: %u\n", eq->writeCount);
+ fprintf(stderr, " rcnt: %u\n", eq->writeCount);
+ fprintf(stderr, " bytes: %p\n", eq->bytes);
+ for (i = 0; i < eq->nelem; i++) {
+ fprintf(stderr, " [%u] = %p\n", i, index_to_bytes(eq, i));
+ }
+
+ fprintf(stderr, "\n");
+ fflush(stderr);
+}
+#endif
+
+apr_status_t
+ap_equeue_create(apr_pool_t *p, apr_uint32_t nelem, apr_size_t elem_size, ap_equeue_t **eqout)
+{
+ ap_equeue_t *eq;
+
+ *eqout = NULL;
+
+ eq = apr_palloc(p, sizeof(ap_equeue_t));
+ eq->nelem = nearest_power(nelem);
+ eq->bytes = apr_palloc(p, eq->nelem * elem_size);
+ eq->elem_size = elem_size;
+ eq->writeCount = 0;
+ eq->readCount = 0;
+ *eqout = eq;
+
+ return APR_SUCCESS;
+}
+
+void *
+ap_equeue_reader_next(ap_equeue_t *eq)
+{
+ if (apr_atomic_read32(&eq->writeCount) == eq->readCount) {
+ return NULL;
+ }
+ else {
+ apr_uint32_t idx = count_to_index(eq, apr_atomic_inc32(&eq->readCount));
+ return index_to_bytes(eq, idx);
+ }
+}
+
+void *
+ap_equeue_writer_value(ap_equeue_t *eq)
+{
+ apr_uint32_t idx;
+
+ while (1) {
+ apr_uint32_t readCount = apr_atomic_read32(&eq->readCount);
+
+ if (count_to_index(eq, eq->writeCount + 1) != count_to_index(eq, readCount)) {
+ break;
+ }
+ /* TODO: research if sched_yield is even worth doing */
+ sched_yield();
+ }
+
+ idx = count_to_index(eq, eq->writeCount);
+ return index_to_bytes(eq, idx);
+}
+
+
+void ap_equeue_writer_onward(ap_equeue_t *eq)
+{
+ apr_atomic_inc32(&eq->writeCount);
+}
diff --git a/server/mpm/eventopt/equeue.h b/server/mpm/eventopt/equeue.h
new file mode 100644
index 0000000000..d3dcbd3024
--- /dev/null
+++ b/server/mpm/eventopt/equeue.h
@@ -0,0 +1,50 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _eventopt_mpm_equeue_h_
+#define _eventopt_mpm_equeue_h_
+
+#include "httpd.h"
+
+typedef struct ap_equeue_t ap_equeue_t;
+
+apr_status_t
+ap_equeue_create(apr_pool_t *p,
+ unsigned int nelem,
+ apr_size_t elem_size,
+ ap_equeue_t **eqout);
+
+
+/**
+ * Current value of the reader, returns NULL if the reader is caught up
+ * with the writer
+ */
+void* ap_equeue_reader_next(ap_equeue_t *eq);
+
+/**
+ * Returns pointer to next available write slot. May block
+ * in a spin lock if none are available.
+ */
+void* ap_equeue_writer_value(ap_equeue_t *eq);
+
+/**
+ * Move the write position up one, making the previously
+ * editted value available to the reader.
+ */
+void ap_equeue_writer_onward(ap_equeue_t *eq);
+
+
+#endif
diff --git a/server/mpm/eventopt/eventopt.c b/server/mpm/eventopt/eventopt.c
new file mode 100644
index 0000000000..24d04856e1
--- /dev/null
+++ b/server/mpm/eventopt/eventopt.c
@@ -0,0 +1,3328 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This MPM tries to fix the 'keep alive problem' in HTTP.
+ *
+ * After a client completes the first request, the client can keep the
+ * connection open to send more requests with the same socket. This can save
+ * signifigant overhead in creating TCP connections. However, the major
+ * disadvantage is that Apache traditionally keeps an entire child
+ * process/thread waiting for data from the client. To solve this problem,
+ * this MPM has a dedicated thread for handling both the Listenting sockets,
+ * and all sockets that are in a Keep Alive status.
+ *
+ * The MPM assumes the underlying apr_pollset implementation is somewhat
+ * threadsafe. This currently is only compatible with KQueue and EPoll. This
+ * enables the MPM to avoid extra high level locking or having to wake up the
+ * listener thread when a keep-alive socket needs to be sent to it.
+ *
+ * This MPM not preform well on older platforms that do not have very good
+ * threading, like Linux with a 2.4 kernel, but this does not matter, since we
+ * require EPoll or KQueue.
+ *
+ * For FreeBSD, use 5.3. It is possible to run this MPM on FreeBSD 5.2.1, if
+ * you use libkse (see `man libmap.conf`).
+ *
+ * For NetBSD, use at least 2.0.
+ *
+ * For Linux, you should use a 2.6 kernel, and make sure your glibc has epoll
+ * support compiled in.
+ *
+ */
+
+#include "apr.h"
+#include "apr_portable.h"
+#include "apr_strings.h"
+#include "apr_file_io.h"
+#include "apr_thread_proc.h"
+#include "apr_signal.h"
+#include "apr_thread_mutex.h"
+#include "apr_poll.h"
+#include "apr_ring.h"
+#include "apr_queue.h"
+#include "apr_atomic.h"
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+#include "apr_version.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#if APR_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#if APR_HAVE_SYS_WAIT_H
+#include <sys/wait.h>
+#endif
+#ifdef HAVE_SYS_PROCESSOR_H
+#include <sys/processor.h> /* for bindprocessor() */
+#endif
+
+#if !APR_HAS_THREADS
+#error The EventOpt MPM requires APR threads, but they are unavailable.
+#endif
+
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_main.h"
+#include "http_log.h"
+#include "http_config.h" /* for read_config */
+#include "http_core.h" /* for get_remote_host */
+#include "http_connection.h"
+#include "ap_mpm.h"
+#include "pod.h"
+#include "mpm_common.h"
+#include "ap_listen.h"
+#include "scoreboard.h"
+#include "fdqueue.h"
+#include "mpm_default.h"
+#include "http_vhost.h"
+#include "unixd.h"
+
+#include <signal.h>
+#include <limits.h> /* for INT_MAX */
+
+
+#include "equeue.h"
+
+#if HAVE_SERF
+#include "mod_serf.h"
+#include "serf.h"
+#endif
+
+/* Limit on the total --- clients will be locked out if more servers than
+ * this are needed. It is intended solely to keep the server from crashing
+ * when things get out of hand.
+ *
+ * We keep a hard maximum number of servers, for two reasons --- first off,
+ * in case something goes seriously wrong, we want to stop the fork bomb
+ * short of actually crashing the machine we're running on by filling some
+ * kernel table. Secondly, it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_SERVER_LIMIT
+#define DEFAULT_SERVER_LIMIT 16
+#endif
+
+/* Admin can't tune ServerLimit beyond MAX_SERVER_LIMIT. We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_SERVER_LIMIT
+#define MAX_SERVER_LIMIT 20000
+#endif
+
+/* Limit on the threads per process. Clients will be locked out if more than
+ * this are needed.
+ *
+ * We keep this for one reason it keeps the size of the scoreboard file small
+ * enough that we can read the whole thing without worrying too much about
+ * the overhead.
+ */
+#ifndef DEFAULT_THREAD_LIMIT
+#define DEFAULT_THREAD_LIMIT 64
+#endif
+
+/* Admin can't tune ThreadLimit beyond MAX_THREAD_LIMIT. We want
+ * some sort of compile-time limit to help catch typos.
+ */
+#ifndef MAX_THREAD_LIMIT
+#define MAX_THREAD_LIMIT 100000
+#endif
+
+#define MPM_CHILD_PID(i) (ap_scoreboard_image->parent[i].pid)
+
+#if !APR_VERSION_AT_LEAST(1,4,0)
+#define apr_time_from_msec(x) (x * 1000)
+#endif
+
+#ifndef MAX_SECS_TO_LINGER
+#define MAX_SECS_TO_LINGER 30
+#endif
+#define SECONDS_TO_LINGER 2
+
+/*
+ * Actual definitions of config globals
+ */
+
+#ifndef DEFAULT_WORKER_FACTOR
+#define DEFAULT_WORKER_FACTOR 2
+#endif
+#define WORKER_FACTOR_SCALE 16 /* scale factor to allow fractional values */
+static unsigned int worker_factor = DEFAULT_WORKER_FACTOR * WORKER_FACTOR_SCALE;
+
+static int threads_per_child = 0; /* Worker threads per child */
+static int ap_daemons_to_start = 0;
+static int min_spare_threads = 0;
+static int max_spare_threads = 0;
+static int ap_daemons_limit = 0;
+static int max_workers = 0;
+static int server_limit = 0;
+static int thread_limit = 0;
+static int dying = 0;
+static int workers_may_exit = 0;
+static int start_thread_may_exit = 0;
+static int listener_may_exit = 0;
+static int requests_this_child;
+static int num_listensocks = 0;
+static apr_uint32_t connection_count = 0;
+static int resource_shortage = 0;
+static fd_queue_t *worker_queue;
+static fd_queue_info_t *worker_queue_info;
+static int mpm_state = AP_MPMQ_STARTING;
+
+typedef enum {
+ TIMEOUT_WRITE_COMPLETION,
+ TIMEOUT_KEEPALIVE,
+ TIMEOUT_LINGER,
+ TIMEOUT_SHORT_LINGER
+} timeout_type_e;
+
+struct event_conn_state_t {
+ /** APR_RING of expiration timeouts */
+ APR_RING_ENTRY(event_conn_state_t) timeout_list;
+ /** the expiration time of the next keepalive timeout */
+ apr_time_t expiration_time;
+ /** connection record this struct refers to */
+ conn_rec *c;
+ /** memory pool to allocate from */
+ apr_pool_t *p;
+ /** bucket allocator */
+ apr_bucket_alloc_t *bucket_alloc;
+ /** poll file descriptor information */
+ apr_pollfd_t pfd;
+ /** public parts of the connection state */
+ conn_state_t pub;
+};
+
+typedef struct pollset_op_t {
+ timeout_type_e timeout_type;
+ event_conn_state_t *cs;
+ const char *tag;
+} pollset_op_t;
+
+
+APR_RING_HEAD(timeout_head_t, event_conn_state_t);
+struct timeout_queue {
+ struct timeout_head_t head;
+ int count;
+ const char *tag;
+};
+/*
+ * Several timeout queues that use different timeouts, so that we always can
+ * simply append to the end.
+ * write_completion_q uses TimeOut
+ * keepalive_q uses KeepAliveTimeOut
+ * linger_q uses MAX_SECS_TO_LINGER
+ * short_linger_q uses SECONDS_TO_LINGER
+ */
+static struct timeout_queue write_completion_q, keepalive_q, linger_q,
+ short_linger_q;
+static apr_pollfd_t *listener_pollfd;
+
+/*
+ * Macros for accessing struct timeout_queue.
+ * For TO_QUEUE_APPEND and TO_QUEUE_REMOVE, timeout_mutex must be held.
+ */
+#define TO_QUEUE_APPEND(q, el) \
+ do { \
+ APR_RING_INSERT_TAIL(&(q).head, el, event_conn_state_t, timeout_list); \
+ (q).count++; \
+ } while (0)
+
+#define TO_QUEUE_REMOVE(q, el) \
+ do { \
+ APR_RING_REMOVE(el, timeout_list); \
+ (q).count--; \
+ } while (0)
+
+#define TO_QUEUE_INIT(q) \
+ do { \
+ APR_RING_INIT(&(q).head, event_conn_state_t, timeout_list); \
+ (q).tag = #q; \
+ } while (0)
+
+#define TO_QUEUE_ELEM_INIT(el) APR_RING_ELEM_INIT(el, timeout_list)
+
+/*
+ * The pollset for sockets that are in any of the timeout queues. Currently
+ * we use the timeout_mutex to make sure that connections are added/removed
+ * atomically to/from both event_pollset and a timeout queue. Otherwise
+ * some confusion can happen under high load if timeout queues and pollset
+ * get out of sync.
+ * XXX: It should be possible to make the lock unnecessary in many or even all
+ * XXX: cases.
+ */
+static apr_pollset_t *event_pollset;
+
+#if HAVE_SERF
+typedef struct {
+ apr_pollset_t *pollset;
+ apr_pool_t *pool;
+} s_baton_t;
+
+static serf_context_t *g_serf;
+#endif
+
+/* The structure used to pass unique initialization info to each thread */
+typedef struct
+{
+ int pid;
+ int tid;
+ int sd;
+} proc_info;
+
+/* Structure used to pass information to the thread responsible for
+ * creating the rest of the threads.
+ */
+typedef struct
+{
+ apr_thread_t **threads;
+ apr_thread_t *listener;
+ int child_num_arg;
+ apr_threadattr_t *threadattr;
+} thread_starter;
+
+typedef enum
+{
+ PT_CSD,
+ PT_ACCEPT
+#if HAVE_SERF
+ , PT_SERF
+#endif
+} poll_type_e;
+
+typedef struct
+{
+ poll_type_e type;
+ void *baton;
+} listener_poll_type;
+
+/* data retained by event across load/unload of the module
+ * allocated on first call to pre-config hook; located on
+ * subsequent calls to pre-config hook
+ */
+typedef struct event_retained_data {
+ int first_server_limit;
+ int first_thread_limit;
+ int module_loads;
+ int sick_child_detected;
+ ap_generation_t my_generation;
+ int volatile is_graceful; /* set from signal handler */
+ int maxclients_reported;
+ /*
+ * The max child slot ever assigned, preserved across restarts. Necessary
+ * to deal with MaxRequestWorkers changes across AP_SIG_GRACEFUL restarts.
+ * We use this value to optimize routines that have to scan the entire
+ * scoreboard.
+ */
+ int max_daemons_limit;
+ /*
+ * idle_spawn_rate is the number of children that will be spawned on the
+ * next maintenance cycle if there aren't enough idle servers. It is
+ * doubled up to MAX_SPAWN_RATE, and reset only when a cycle goes by
+ * without the need to spawn.
+ */
+ int idle_spawn_rate;
+#ifndef MAX_SPAWN_RATE
+#define MAX_SPAWN_RATE (32)
+#endif
+ int hold_off_on_exponential_spawning;
+} event_retained_data;
+static event_retained_data *retained;
+
+#define ID_FROM_CHILD_THREAD(c, t) ((c * thread_limit) + t)
+
+static ap_eventopt_pod_t *pod;
+
+/* The eventopt MPM respects a couple of runtime flags that can aid
+ * in debugging. Setting the -DNO_DETACH flag will prevent the root process
+ * from detaching from its controlling terminal. Additionally, setting
+ * the -DONE_PROCESS flag (which implies -DNO_DETACH) will get you the
+ * child_main loop running in the process which originally started up.
+ * This gives you a pretty nice debugging environment. (You'll get a SIGHUP
+ * early in standalone_main; just continue through. This is the server
+ * trying to kill off any child processes which it might have lying
+ * around --- Apache doesn't keep track of their pids, it just sends
+ * SIGHUP to the process group, ignoring it in the root process.
+ * Continue through and you'll be fine.).
+ */
+
+static int one_process = 0;
+
+#ifdef DEBUG_SIGSTOP
+int raise_sigstop_flags;
+#endif
+
+static apr_pool_t *pconf; /* Pool for config stuff */
+static apr_pool_t *pchild; /* Pool for httpd child stuff */
+
+static pid_t ap_my_pid; /* Linux getpid() doesn't work except in main
+ thread. Use this instead */
+static pid_t parent_pid;
+static apr_os_thread_t *listener_os_thread;
+
+/* The LISTENER_SIGNAL signal will be sent from the main thread to the
+ * listener thread to wake it up for graceful termination (what a child
+ * process from an old generation does when the admin does "apachectl
+ * graceful"). This signal will be blocked in all threads of a child
+ * process except for the listener thread.
+ */
+#define LISTENER_SIGNAL SIGHUP
+
+/* An array of socket descriptors in use by each thread used to
+ * perform a non-graceful (forced) shutdown of the server.
+ */
+static apr_socket_t **worker_sockets;
+static ap_equeue_t **worker_equeues;
+
+static void disable_listensocks(int process_slot)
+{
+ int i;
+ for (i = 0; i < num_listensocks; i++) {
+ apr_pollset_remove(event_pollset, &listener_pollfd[i]);
+ }
+ ap_scoreboard_image->parent[process_slot].not_accepting = 1;
+}
+
+static void enable_listensocks(int process_slot)
+{
+ int i;
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00457)
+ "Accepting new connections again: "
+ "%u active conns, %u idle workers",
+ apr_atomic_read32(&connection_count),
+ ap_queue_info_get_idlers(worker_queue_info));
+ for (i = 0; i < num_listensocks; i++)
+ apr_pollset_add(event_pollset, &listener_pollfd[i]);
+ /*
+ * XXX: This is not yet optimal. If many workers suddenly become available,
+ * XXX: the parent may kill some processes off too soon.
+ */
+ ap_scoreboard_image->parent[process_slot].not_accepting = 0;
+}
+
+static void close_worker_sockets(void)
+{
+ int i;
+ for (i = 0; i < threads_per_child; i++) {
+ if (worker_sockets[i]) {
+ apr_socket_close(worker_sockets[i]);
+ worker_sockets[i] = NULL;
+ }
+ }
+}
+
+static void wakeup_listener(void)
+{
+ listener_may_exit = 1;
+ if (!listener_os_thread) {
+ /* XXX there is an obscure path that this doesn't handle perfectly:
+ * right after listener thread is created but before
+ * listener_os_thread is set, the first worker thread hits an
+ * error and starts graceful termination
+ */
+ return;
+ }
+
+ /* unblock the listener if it's waiting for a worker */
+ ap_queue_info_term(worker_queue_info);
+
+ /*
+ * we should just be able to "kill(ap_my_pid, LISTENER_SIGNAL)" on all
+ * platforms and wake up the listener thread since it is the only thread
+ * with SIGHUP unblocked, but that doesn't work on Linux
+ */
+#ifdef HAVE_PTHREAD_KILL
+ pthread_kill(*listener_os_thread, LISTENER_SIGNAL);
+#else
+ kill(ap_my_pid, LISTENER_SIGNAL);
+#endif
+}
+
+#define ST_INIT 0
+#define ST_GRACEFUL 1
+#define ST_UNGRACEFUL 2
+
+static int terminate_mode = ST_INIT;
+
+static void signal_threads(int mode)
+{
+ if (terminate_mode == mode) {
+ return;
+ }
+ terminate_mode = mode;
+ mpm_state = AP_MPMQ_STOPPING;
+
+ /* in case we weren't called from the listener thread, wake up the
+ * listener thread
+ */
+ wakeup_listener();
+
+ /* for ungraceful termination, let the workers exit now;
+ * for graceful termination, the listener thread will notify the
+ * workers to exit once it has stopped accepting new connections
+ */
+ if (mode == ST_UNGRACEFUL) {
+ workers_may_exit = 1;
+ ap_queue_interrupt_all(worker_queue);
+ close_worker_sockets(); /* forcefully kill all current connections */
+ }
+}
+
+static int event_query(int query_code, int *result, apr_status_t *rv)
+{
+ *rv = APR_SUCCESS;
+ switch (query_code) {
+ case AP_MPMQ_MAX_DAEMON_USED:
+ *result = retained->max_daemons_limit;
+ break;
+ case AP_MPMQ_IS_THREADED:
+ *result = AP_MPMQ_STATIC;
+ break;
+ case AP_MPMQ_IS_FORKED:
+ *result = AP_MPMQ_DYNAMIC;
+ break;
+ case AP_MPMQ_IS_ASYNC:
+ *result = 1;
+ break;
+ case AP_MPMQ_HAS_SERF:
+ *result = 1;
+ break;
+ case AP_MPMQ_HARD_LIMIT_DAEMONS:
+ *result = server_limit;
+ break;
+ case AP_MPMQ_HARD_LIMIT_THREADS:
+ *result = thread_limit;
+ break;
+ case AP_MPMQ_MAX_THREADS:
+ *result = threads_per_child;
+ break;
+ case AP_MPMQ_MIN_SPARE_DAEMONS:
+ *result = 0;
+ break;
+ case AP_MPMQ_MIN_SPARE_THREADS:
+ *result = min_spare_threads;
+ break;
+ case AP_MPMQ_MAX_SPARE_DAEMONS:
+ *result = 0;
+ break;
+ case AP_MPMQ_MAX_SPARE_THREADS:
+ *result = max_spare_threads;
+ break;
+ case AP_MPMQ_MAX_REQUESTS_DAEMON:
+ *result = ap_max_requests_per_child;
+ break;
+ case AP_MPMQ_MAX_DAEMONS:
+ *result = ap_daemons_limit;
+ break;
+ case AP_MPMQ_MPM_STATE:
+ *result = mpm_state;
+ break;
+ case AP_MPMQ_GENERATION:
+ *result = retained->my_generation;
+ break;
+ default:
+ *rv = APR_ENOTIMPL;
+ break;
+ }
+ return OK;
+}
+
+static void event_note_child_killed(int childnum, pid_t pid, ap_generation_t gen)
+{
+ if (childnum != -1) { /* child had a scoreboard slot? */
+ ap_run_child_status(ap_server_conf,
+ ap_scoreboard_image->parent[childnum].pid,
+ ap_scoreboard_image->parent[childnum].generation,
+ childnum, MPM_CHILD_EXITED);
+ ap_scoreboard_image->parent[childnum].pid = 0;
+ }
+ else {
+ ap_run_child_status(ap_server_conf, pid, gen, -1, MPM_CHILD_EXITED);
+ }
+}
+
+static void event_note_child_started(int slot, pid_t pid)
+{
+ ap_scoreboard_image->parent[slot].pid = pid;
+ ap_run_child_status(ap_server_conf,
+ ap_scoreboard_image->parent[slot].pid,
+ retained->my_generation, slot, MPM_CHILD_STARTED);
+}
+
+static void event_note_child_lost_slot(int slot, pid_t newpid)
+{
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00458)
+ "pid %" APR_PID_T_FMT " taking over scoreboard slot from "
+ "%" APR_PID_T_FMT "%s",
+ newpid,
+ ap_scoreboard_image->parent[slot].pid,
+ ap_scoreboard_image->parent[slot].quiescing ?
+ " (quiescing)" : "");
+ ap_run_child_status(ap_server_conf,
+ ap_scoreboard_image->parent[slot].pid,
+ ap_scoreboard_image->parent[slot].generation,
+ slot, MPM_CHILD_LOST_SLOT);
+ /* Don't forget about this exiting child process, or we
+ * won't be able to kill it if it doesn't exit by the
+ * time the server is shut down.
+ */
+ ap_register_extra_mpm_process(ap_scoreboard_image->parent[slot].pid,
+ ap_scoreboard_image->parent[slot].generation);
+}
+
+static const char *event_get_name(void)
+{
+ return "eventopt";
+}
+
+/* a clean exit from a child with proper cleanup */
+static void clean_child_exit(int code) __attribute__ ((noreturn));
+static void clean_child_exit(int code)
+{
+ mpm_state = AP_MPMQ_STOPPING;
+ if (pchild) {
+ apr_pool_destroy(pchild);
+ }
+
+ if (one_process) {
+ event_note_child_killed(/* slot */ 0, 0, 0);
+ }
+
+ exit(code);
+}
+
+static void just_die(int sig)
+{
+ clean_child_exit(0);
+}
+
+/*****************************************************************
+ * Connection structures and accounting...
+ */
+
+static int child_fatal;
+
+/* volatile because they're updated from a signal handler */
+static int volatile shutdown_pending;
+static int volatile restart_pending;
+
+static apr_status_t decrement_connection_count(void *dummy) {
+ apr_atomic_dec32(&connection_count);
+ return APR_SUCCESS;
+}
+
+/*
+ * ap_start_shutdown() and ap_start_restart(), below, are a first stab at
+ * functions to initiate shutdown or restart without relying on signals.
+ * Previously this was initiated in sig_term() and restart() signal handlers,
+ * but we want to be able to start a shutdown/restart from other sources --
+ * e.g. on Win32, from the service manager. Now the service manager can
+ * call ap_start_shutdown() or ap_start_restart() as appropiate. Note that
+ * these functions can also be called by the child processes, since global
+ * variables are no longer used to pass on the required action to the parent.
+ *
+ * These should only be called from the parent process itself, since the
+ * parent process will use the shutdown_pending and restart_pending variables
+ * to determine whether to shutdown or restart. The child process should
+ * call signal_parent() directly to tell the parent to die -- this will
+ * cause neither of those variable to be set, which the parent will
+ * assume means something serious is wrong (which it will be, for the
+ * child to force an exit) and so do an exit anyway.
+ */
+
+static void ap_start_shutdown(int graceful)
+{
+ mpm_state = AP_MPMQ_STOPPING;
+ if (shutdown_pending == 1) {
+ /* Um, is this _probably_ not an error, if the user has
+ * tried to do a shutdown twice quickly, so we won't
+ * worry about reporting it.
+ */
+ return;
+ }
+ shutdown_pending = 1;
+ retained->is_graceful = graceful;
+}
+
+/* do a graceful restart if graceful == 1 */
+static void ap_start_restart(int graceful)
+{
+ mpm_state = AP_MPMQ_STOPPING;
+ if (restart_pending == 1) {
+ /* Probably not an error - don't bother reporting it */
+ return;
+ }
+ restart_pending = 1;
+ retained->is_graceful = graceful;
+}
+
+static void sig_term(int sig)
+{
+ ap_start_shutdown(sig == AP_SIG_GRACEFUL_STOP);
+}
+
+static void restart(int sig)
+{
+ ap_start_restart(sig == AP_SIG_GRACEFUL);
+}
+
+static void set_signals(void)
+{
+#ifndef NO_USE_SIGACTION
+ struct sigaction sa;
+#endif
+
+ if (!one_process) {
+ ap_fatal_signal_setup(ap_server_conf, pconf);
+ }
+
+#ifndef NO_USE_SIGACTION
+ sigemptyset(&sa.sa_mask);
+ sa.sa_flags = 0;
+
+ sa.sa_handler = sig_term;
+ if (sigaction(SIGTERM, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00459)
+ "sigaction(SIGTERM)");
+#ifdef AP_SIG_GRACEFUL_STOP
+ if (sigaction(AP_SIG_GRACEFUL_STOP, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00460)
+ "sigaction(" AP_SIG_GRACEFUL_STOP_STRING ")");
+#endif
+#ifdef SIGINT
+ if (sigaction(SIGINT, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00461)
+ "sigaction(SIGINT)");
+#endif
+#ifdef SIGXCPU
+ sa.sa_handler = SIG_DFL;
+ if (sigaction(SIGXCPU, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00462)
+ "sigaction(SIGXCPU)");
+#endif
+#ifdef SIGXFSZ
+ /* For systems following the LFS standard, ignoring SIGXFSZ allows
+ * a write() beyond the 2GB limit to fail gracefully with E2BIG
+ * rather than terminate the process. */
+ sa.sa_handler = SIG_IGN;
+ if (sigaction(SIGXFSZ, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00463)
+ "sigaction(SIGXFSZ)");
+#endif
+#ifdef SIGPIPE
+ sa.sa_handler = SIG_IGN;
+ if (sigaction(SIGPIPE, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00464)
+ "sigaction(SIGPIPE)");
+#endif
+
+ /* we want to ignore HUPs and AP_SIG_GRACEFUL while we're busy
+ * processing one */
+ sigaddset(&sa.sa_mask, SIGHUP);
+ sigaddset(&sa.sa_mask, AP_SIG_GRACEFUL);
+ sa.sa_handler = restart;
+ if (sigaction(SIGHUP, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00465)
+ "sigaction(SIGHUP)");
+ if (sigaction(AP_SIG_GRACEFUL, &sa, NULL) < 0)
+ ap_log_error(APLOG_MARK, APLOG_WARNING, errno, ap_server_conf, APLOGNO(00466)
+ "sigaction(" AP_SIG_GRACEFUL_STRING ")");
+#else
+ if (!one_process) {
+#ifdef SIGXCPU
+ apr_signal(SIGXCPU, SIG_DFL);
+#endif /* SIGXCPU */
+#ifdef SIGXFSZ
+ apr_signal(SIGXFSZ, SIG_IGN);
+#endif /* SIGXFSZ */
+ }
+
+ apr_signal(SIGTERM, sig_term);
+#ifdef SIGHUP
+ apr_signal(SIGHUP, restart);
+#endif /* SIGHUP */
+#ifdef AP_SIG_GRACEFUL
+ apr_signal(AP_SIG_GRACEFUL, restart);
+#endif /* AP_SIG_GRACEFUL */
+#ifdef AP_SIG_GRACEFUL_STOP
+ apr_signal(AP_SIG_GRACEFUL_STOP, sig_term);
+#endif /* AP_SIG_GRACEFUL_STOP */
+#ifdef SIGPIPE
+ apr_signal(SIGPIPE, SIG_IGN);
+#endif /* SIGPIPE */
+
+#endif
+}
+
+static void process_pollop(pollset_op_t *op)
+{
+ apr_status_t rv;
+ event_conn_state_t *cs = op->cs;
+
+ switch (op->timeout_type) {
+ case TIMEOUT_WRITE_COMPLETION:
+ TO_QUEUE_APPEND(write_completion_q, cs);
+ break;
+ case TIMEOUT_KEEPALIVE:
+ TO_QUEUE_APPEND(keepalive_q, cs);
+ break;
+ case TIMEOUT_LINGER:
+ TO_QUEUE_APPEND(linger_q, cs);
+ break;
+ case TIMEOUT_SHORT_LINGER:
+ TO_QUEUE_APPEND(short_linger_q, cs);
+ break;
+ }
+
+ rv = apr_pollset_add(event_pollset, &op->cs->pfd);
+
+ if (rv != APR_SUCCESS && !APR_STATUS_IS_EEXIST(rv)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00467)
+ "%s: apr_pollset_add failure", op->tag);
+ }
+}
+
+/*
+ * close our side of the connection
+ * Pre-condition: cs is not in any timeout queue and not in the pollset,
+ * timeout_mutex is not locked
+ * return: 0 if connection is fully closed,
+ * 1 if connection is lingering
+ * may be called by listener or by worker thread.
+ * the eq may be null if called from the listener thread,
+ * and the pollset operations are done directly by this function.
+ */
+static int start_lingering_close(event_conn_state_t *cs, ap_equeue_t *eq)
+{
+ apr_status_t rv;
+
+ cs->c->sbh = NULL; /* prevent scoreboard updates from the listener
+ * worker will loop around soon and set SERVER_READY
+ */
+
+ if (ap_start_lingering_close(cs->c)) {
+ apr_pool_clear(cs->p);
+ ap_push_pool(worker_queue_info, cs->p);
+ return 0;
+ }
+ else {
+ apr_socket_t *csd = ap_get_conn_socket(cs->c);
+ pollset_op_t localv;
+ pollset_op_t *v;
+
+ if (eq) {
+ v = ap_equeue_writer_value(eq);
+ }
+ else {
+ v = &localv;
+ }
+
+#ifdef AP_DEBUG
+ {
+ rv = apr_socket_timeout_set(csd, 0);
+ AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+ }
+#else
+ apr_socket_timeout_set(csd, 0);
+#endif
+ /*
+ * If some module requested a shortened waiting period, only wait for
+ * 2s (SECONDS_TO_LINGER). This is useful for mitigating certain
+ * DoS attacks.
+ */
+ if (apr_table_get(cs->c->notes, "short-lingering-close")) {
+ cs->expiration_time =
+ apr_time_now() + apr_time_from_sec(SECONDS_TO_LINGER);
+ v->timeout_type = TIMEOUT_SHORT_LINGER;
+ v->tag = "start_lingering_close(short)";
+ cs->pub.state = CONN_STATE_LINGER_SHORT;
+ }
+ else {
+ cs->expiration_time =
+ apr_time_now() + apr_time_from_sec(MAX_SECS_TO_LINGER);
+ v->timeout_type = TIMEOUT_LINGER;
+ v->tag = "start_lingering_close(normal)";
+ cs->pub.state = CONN_STATE_LINGER_NORMAL;
+ }
+
+ cs->pfd.reqevents = APR_POLLIN | APR_POLLHUP | APR_POLLERR;
+ v->cs = cs;
+ if (eq != NULL) {
+ ap_equeue_writer_onward(eq);
+ apr_pollset_wakeup(event_pollset);
+ }
+ else {
+ process_pollop(v);
+ }
+ }
+ return 1;
+}
+
+/*
+ * forcibly close a lingering connection after the lingering period has
+ * expired
+ * Pre-condition: cs is not in any timeout queue and not in the pollset
+ * return: irrelevant (need same prototype as start_lingering_close)
+ */
+static int stop_lingering_close(event_conn_state_t *cs, ap_equeue_t *eq)
+{
+ apr_status_t rv;
+ apr_socket_t *csd = ap_get_conn_socket(cs->c);
+ ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
+ "socket reached timeout in lingering-close state");
+ rv = apr_socket_close(csd);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf, APLOGNO(00468) "error closing socket");
+ AP_DEBUG_ASSERT(0);
+ }
+ apr_pool_clear(cs->p);
+ ap_push_pool(worker_queue_info, cs->p);
+ return 0;
+}
+
+/*
+ * process one connection in the worker
+ * return: 1 if the connection has been completed,
+ * 0 if it is still open and waiting for some event
+ */
+static int process_socket(apr_thread_t *thd, apr_pool_t * p, apr_socket_t * sock,
+ event_conn_state_t * cs,
+ ap_equeue_t *eq,
+ int my_child_num,
+ int my_thread_num)
+{
+ conn_rec *c;
+ long conn_id = ID_FROM_CHILD_THREAD(my_child_num, my_thread_num);
+ int rc;
+ ap_sb_handle_t *sbh;
+
+ ap_create_sb_handle(&sbh, p, my_child_num, my_thread_num);
+
+ if (cs == NULL) { /* This is a new connection */
+ listener_poll_type *pt = apr_pcalloc(p, sizeof(*pt));
+ cs = apr_pcalloc(p, sizeof(event_conn_state_t));
+ cs->bucket_alloc = apr_bucket_alloc_create(p);
+ c = ap_run_create_connection(p, ap_server_conf, sock,
+ conn_id, sbh, cs->bucket_alloc);
+ if (!c) {
+ apr_bucket_alloc_destroy(cs->bucket_alloc);
+ apr_pool_clear(p);
+ ap_push_pool(worker_queue_info, p);
+ return 1;
+ }
+ apr_atomic_inc32(&connection_count);
+ apr_pool_cleanup_register(c->pool, NULL, decrement_connection_count, apr_pool_cleanup_null);
+ c->current_thread = thd;
+ cs->c = c;
+ c->cs = &(cs->pub);
+ cs->p = p;
+ cs->pfd.desc_type = APR_POLL_SOCKET;
+ cs->pfd.reqevents = APR_POLLIN;
+ cs->pfd.desc.s = sock;
+ pt->type = PT_CSD;
+ pt->baton = cs;
+ cs->pfd.client_data = pt;
+
+ ap_update_vhost_given_ip(c);
+
+ rc = ap_run_pre_connection(c, sock);
+ if (rc != OK && rc != DONE) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, 0, c, APLOGNO(00469)
+ "process_socket: connection aborted");
+ c->aborted = 1;
+ }
+
+ /**
+ * XXX If the platform does not have a usable way of bundling
+ * accept() with a socket readability check, like Win32,
+ * and there are measurable delays before the
+ * socket is readable due to the first data packet arriving,
+ * it might be better to create the cs on the listener thread
+ * with the state set to CONN_STATE_CHECK_REQUEST_LINE_READABLE
+ *
+ * FreeBSD users will want to enable the HTTP accept filter
+ * module in their kernel for the highest performance
+ * When the accept filter is active, sockets are kept in the
+ * kernel until a HTTP request is received.
+ */
+ cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+
+ }
+ else {
+ c = cs->c;
+ c->sbh = sbh;
+ c->current_thread = thd;
+ }
+
+ if (c->clogging_input_filters && !c->aborted) {
+ /* Since we have an input filter which 'cloggs' the input stream,
+ * like mod_ssl, lets just do the normal read from input filters,
+ * like the Worker MPM does.
+ */
+ ap_run_process_connection(c);
+ if (cs->pub.state != CONN_STATE_SUSPENDED) {
+ cs->pub.state = CONN_STATE_LINGER;
+ }
+ }
+
+read_request:
+ if (cs->pub.state == CONN_STATE_READ_REQUEST_LINE) {
+ if (!c->aborted) {
+ ap_run_process_connection(c);
+
+ /* state will be updated upon return
+ * fall thru to either wait for readability/timeout or
+ * do lingering close
+ */
+ }
+ else {
+ cs->pub.state = CONN_STATE_LINGER;
+ }
+ }
+
+ if (cs->pub.state == CONN_STATE_WRITE_COMPLETION) {
+ ap_filter_t *output_filter = c->output_filters;
+ apr_status_t rv;
+ ap_update_child_status_from_conn(sbh, SERVER_BUSY_WRITE, c);
+ while (output_filter->next != NULL) {
+ output_filter = output_filter->next;
+ }
+ rv = output_filter->frec->filter_func.out_func(output_filter, NULL);
+ if (rv != APR_SUCCESS) {
+ ap_log_cerror(APLOG_MARK, APLOG_DEBUG, rv, c, APLOGNO(00470)
+ "network write failure in core output filter");
+ cs->pub.state = CONN_STATE_LINGER;
+ }
+ else if (c->data_in_output_filters) {
+ /* Still in WRITE_COMPLETION_STATE:
+ * Set a write timeout for this connection, and let the
+ * event thread poll for writeability.
+ */
+ pollset_op_t *v = ap_equeue_writer_value(eq);
+
+ cs->expiration_time = ap_server_conf->timeout + apr_time_now();
+ cs->pfd.reqevents = APR_POLLOUT | APR_POLLHUP | APR_POLLERR;
+
+ v->cs = cs;
+ v->timeout_type = TIMEOUT_WRITE_COMPLETION;
+ v->tag = "process_socket(write_completion)";
+
+ ap_equeue_writer_onward(eq);
+ apr_pollset_wakeup(event_pollset);
+ return 1;
+ }
+ else if (c->keepalive != AP_CONN_KEEPALIVE || c->aborted ||
+ listener_may_exit) {
+ cs->pub.state = CONN_STATE_LINGER;
+ }
+ else if (c->data_in_input_filters) {
+ cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+ goto read_request;
+ }
+ else {
+ cs->pub.state = CONN_STATE_CHECK_REQUEST_LINE_READABLE;
+ }
+ }
+
+ if (cs->pub.state == CONN_STATE_LINGER) {
+ if (!start_lingering_close(cs, eq)) {
+ return 0;
+ }
+ }
+ else if (cs->pub.state == CONN_STATE_CHECK_REQUEST_LINE_READABLE) {
+ pollset_op_t *v;
+
+ /* It greatly simplifies the logic to use a single timeout value here
+ * because the new element can just be added to the end of the list and
+ * it will stay sorted in expiration time sequence. If brand new
+ * sockets are sent to the event thread for a readability check, this
+ * will be a slight behavior change - they use the non-keepalive
+ * timeout today. With a normal client, the socket will be readable in
+ * a few milliseconds anyway.
+ */
+ cs->expiration_time = ap_server_conf->keep_alive_timeout +
+ apr_time_now();
+
+ /* Add work to pollset. */
+ v = ap_equeue_writer_value(eq);
+ v->timeout_type = TIMEOUT_KEEPALIVE;
+ v->cs = cs;
+ cs->pfd.reqevents = APR_POLLIN;
+ v->tag = "process_socket(keepalive)";
+ ap_equeue_writer_onward(eq);
+ apr_pollset_wakeup(event_pollset);
+ }
+ return 1;
+}
+
+/* requests_this_child has gone to zero or below. See if the admin coded
+ "MaxConnectionsPerChild 0", and keep going in that case. Doing it this way
+ simplifies the hot path in worker_thread */
+static void check_infinite_requests(void)
+{
+ if (ap_max_requests_per_child) {
+ signal_threads(ST_GRACEFUL);
+ }
+ else {
+ requests_this_child = INT_MAX; /* keep going */
+ }
+}
+
+static void close_listeners(int process_slot, int *closed) {
+ if (!*closed) {
+ int i;
+ disable_listensocks(process_slot);
+ ap_close_listeners();
+ *closed = 1;
+ dying = 1;
+ ap_scoreboard_image->parent[process_slot].quiescing = 1;
+ for (i = 0; i < threads_per_child; ++i) {
+ ap_update_child_status_from_indexes(process_slot, i,
+ SERVER_GRACEFUL, NULL);
+ }
+ /* wake up the main thread */
+ kill(ap_my_pid, SIGTERM);
+ }
+}
+
+static void unblock_signal(int sig)
+{
+ sigset_t sig_mask;
+
+ sigemptyset(&sig_mask);
+ sigaddset(&sig_mask, sig);
+#if defined(SIGPROCMASK_SETS_THREAD_MASK)
+ sigprocmask(SIG_UNBLOCK, &sig_mask, NULL);
+#else
+ pthread_sigmask(SIG_UNBLOCK, &sig_mask, NULL);
+#endif
+}
+
+static void dummy_signal_handler(int sig)
+{
+ /* XXX If specifying SIG_IGN is guaranteed to unblock a syscall,
+ * then we don't need this goofy function.
+ */
+}
+
+
+#if HAVE_SERF
+static apr_status_t s_socket_add(void *user_baton,
+ apr_pollfd_t *pfd,
+ void *serf_baton)
+{
+ s_baton_t *s = (s_baton_t*)user_baton;
+ /* XXXXX: recycle listener_poll_types */
+ listener_poll_type *pt = ap_malloc(sizeof(*pt));
+ pt->type = PT_SERF;
+ pt->baton = serf_baton;
+ pfd->client_data = pt;
+ return apr_pollset_add(s->pollset, pfd);
+}
+
+static apr_status_t s_socket_remove(void *user_baton,
+ apr_pollfd_t *pfd,
+ void *serf_baton)
+{
+ s_baton_t *s = (s_baton_t*)user_baton;
+ listener_poll_type *pt = pfd->client_data;
+ free(pt);
+ return apr_pollset_remove(s->pollset, pfd);
+}
+#endif
+
+static apr_status_t init_pollset(apr_pool_t *p)
+{
+#if HAVE_SERF
+ s_baton_t *baton = NULL;
+#endif
+ ap_listen_rec *lr;
+ listener_poll_type *pt;
+ int i = 0;
+
+ TO_QUEUE_INIT(write_completion_q);
+ TO_QUEUE_INIT(keepalive_q);
+ TO_QUEUE_INIT(linger_q);
+ TO_QUEUE_INIT(short_linger_q);
+
+ listener_pollfd = apr_palloc(p, sizeof(apr_pollfd_t) * num_listensocks);
+ for (lr = ap_listeners; lr != NULL; lr = lr->next, i++) {
+ apr_pollfd_t *pfd;
+ AP_DEBUG_ASSERT(i < num_listensocks);
+ pfd = &listener_pollfd[i];
+ pt = apr_pcalloc(p, sizeof(*pt));
+ pfd->desc_type = APR_POLL_SOCKET;
+ pfd->desc.s = lr->sd;
+ pfd->reqevents = APR_POLLIN;
+
+ pt->type = PT_ACCEPT;
+ pt->baton = lr;
+
+ pfd->client_data = pt;
+
+ apr_socket_opt_set(pfd->desc.s, APR_SO_NONBLOCK, 1);
+ apr_pollset_add(event_pollset, pfd);
+
+ lr->accept_func = ap_unixd_accept;
+ }
+
+#if HAVE_SERF
+ baton = apr_pcalloc(p, sizeof(*baton));
+ baton->pollset = event_pollset;
+ /* TODO: subpools, threads, reuse, etc. -- currently use malloc() inside :( */
+ baton->pool = p;
+
+ g_serf = serf_context_create_ex(baton,
+ s_socket_add,
+ s_socket_remove, p);
+
+ ap_register_provider(p, "mpm_serf",
+ "instance", "0", g_serf);
+
+#endif
+
+ return APR_SUCCESS;
+}
+
+static apr_status_t push_timer2worker(timer_event_t* te)
+{
+ return ap_queue_push_timer(worker_queue, te);
+}
+
+/*
+ * Pre-condition: pfd->cs is neither in pollset nor timeout queue
+ * this function may only be called by the listener
+ */
+static apr_status_t push2worker(const apr_pollfd_t * pfd,
+ apr_pollset_t * pollset)
+{
+ listener_poll_type *pt = (listener_poll_type *) pfd->client_data;
+ event_conn_state_t *cs = (event_conn_state_t *) pt->baton;
+ apr_status_t rc;
+
+ rc = ap_queue_push(worker_queue, cs->pfd.desc.s, cs, cs->p);
+ if (rc != APR_SUCCESS) {
+ /* trash the connection; we couldn't queue the connected
+ * socket to a worker
+ */
+ apr_bucket_alloc_destroy(cs->bucket_alloc);
+ apr_socket_close(cs->pfd.desc.s);
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf, APLOGNO(00471) "push2worker: ap_queue_push failed");
+ apr_pool_clear(cs->p);
+ ap_push_pool(worker_queue_info, cs->p);
+ }
+
+ return rc;
+}
+
+/* get_worker:
+ * If *have_idle_worker_p == 0, reserve a worker thread, and set
+ * *have_idle_worker_p = 1.
+ * If *have_idle_worker_p is already 1, will do nothing.
+ * If blocking == 1, block if all workers are currently busy.
+ * If no worker was available immediately, will set *all_busy to 1.
+ * XXX: If there are no workers, we should not block immediately but
+ * XXX: close all keep-alive connections first.
+ */
+static void get_worker(int *have_idle_worker_p, int blocking, int *all_busy)
+{
+ apr_status_t rc;
+
+ if (*have_idle_worker_p) {
+ /* already reserved a worker thread - must have hit a
+ * transient error on a previous pass
+ */
+ return;
+ }
+
+ if (blocking)
+ rc = ap_queue_info_wait_for_idler(worker_queue_info, all_busy);
+ else
+ rc = ap_queue_info_try_get_idler(worker_queue_info);
+
+ if (rc == APR_SUCCESS) {
+ *have_idle_worker_p = 1;
+ }
+ else if (!blocking && rc == APR_EAGAIN) {
+ *all_busy = 1;
+ }
+ else if (!APR_STATUS_IS_EOF(rc)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf, APLOGNO(00472)
+ "ap_queue_info_wait_for_idler failed. "
+ "Attempting to shutdown process gracefully");
+ signal_threads(ST_GRACEFUL);
+ }
+}
+
+/* XXXXXX: Convert to skiplist or other better data structure
+ * (yes, this is VERY VERY VERY VERY BAD)
+ */
+
+/* Structures to reuse */
+static APR_RING_HEAD(timer_free_ring_t, timer_event_t) timer_free_ring;
+/* Active timers */
+static APR_RING_HEAD(timer_ring_t, timer_event_t) timer_ring;
+
+static apr_thread_mutex_t *g_timer_ring_mtx;
+
+static apr_status_t event_register_timed_callback(apr_time_t t,
+ ap_mpm_callback_fn_t *cbfn,
+ void *baton)
+{
+ int inserted = 0;
+ timer_event_t *ep;
+ timer_event_t *te;
+ /* oh yeah, and make locking smarter/fine grained. */
+ apr_thread_mutex_lock(g_timer_ring_mtx);
+
+ if (!APR_RING_EMPTY(&timer_free_ring, timer_event_t, link)) {
+ te = APR_RING_FIRST(&timer_free_ring);
+ APR_RING_REMOVE(te, link);
+ }
+ else {
+ /* XXXXX: lol, pool allocation without a context from any thread.Yeah. Right. MPMs Suck. */
+ te = ap_malloc(sizeof(timer_event_t));
+ APR_RING_ELEM_INIT(te, link);
+ }
+
+ te->cbfunc = cbfn;
+ te->baton = baton;
+ /* XXXXX: optimize */
+ te->when = t + apr_time_now();
+
+ /* Okay, insert sorted by when.. */
+ for (ep = APR_RING_FIRST(&timer_ring);
+ ep != APR_RING_SENTINEL(&timer_ring,
+ timer_event_t, link);
+ ep = APR_RING_NEXT(ep, link))
+ {
+ if (ep->when > te->when) {
+ inserted = 1;
+ APR_RING_INSERT_BEFORE(ep, te, link);
+ break;
+ }
+ }
+
+ if (!inserted) {
+ APR_RING_INSERT_TAIL(&timer_ring, te, timer_event_t, link);
+ }
+
+ apr_thread_mutex_unlock(g_timer_ring_mtx);
+
+ return APR_SUCCESS;
+}
+
+/*
+ * Close socket and clean up if remote closed its end while we were in
+ * lingering close.
+ * Only to be called in the listener thread;
+ * Pre-condition: cs is in one of the linger queues and in the pollset
+ */
+static void process_lingering_close(event_conn_state_t *cs, const apr_pollfd_t *pfd)
+{
+ apr_socket_t *csd = ap_get_conn_socket(cs->c);
+ char dummybuf[2048];
+ apr_size_t nbytes;
+ apr_status_t rv;
+ struct timeout_queue *q;
+ q = (cs->pub.state == CONN_STATE_LINGER_SHORT) ? &short_linger_q : &linger_q;
+
+ /* socket is already in non-blocking state */
+ do {
+ nbytes = sizeof(dummybuf);
+ rv = apr_socket_recv(csd, dummybuf, &nbytes);
+ } while (rv == APR_SUCCESS);
+
+ if (!APR_STATUS_IS_EOF(rv)) {
+ return;
+ }
+
+ rv = apr_pollset_remove(event_pollset, pfd);
+ AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+
+ rv = apr_socket_close(csd);
+ AP_DEBUG_ASSERT(rv == APR_SUCCESS);
+
+ TO_QUEUE_REMOVE(*q, cs);
+ TO_QUEUE_ELEM_INIT(cs);
+
+ apr_pool_clear(cs->p);
+ ap_push_pool(worker_queue_info, cs->p);
+}
+
+/* call 'func' for all elements of 'q' with timeout less than 'timeout_time'.
+ * Pre-condition: timeout_mutex must already be locked
+ * Post-condition: timeout_mutex will be locked again
+ */
+static void process_timeout_queue(struct timeout_queue *q,
+ apr_time_t timeout_time,
+ int (*func)(event_conn_state_t *, ap_equeue_t *eq))
+{
+ int count = 0;
+ event_conn_state_t *first, *cs, *last;
+ apr_status_t rv;
+ if (!q->count) {
+ return;
+ }
+ AP_DEBUG_ASSERT(!APR_RING_EMPTY(&q->head, event_conn_state_t, timeout_list));
+
+ cs = first = APR_RING_FIRST(&q->head);
+ while (cs != APR_RING_SENTINEL(&q->head, event_conn_state_t, timeout_list)
+ && cs->expiration_time < timeout_time) {
+ last = cs;
+ rv = apr_pollset_remove(event_pollset, &cs->pfd);
+ if (rv != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rv)) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, rv, cs->c, APLOGNO(00473)
+ "apr_pollset_remove failed");
+ }
+ cs = APR_RING_NEXT(cs, timeout_list);
+ count++;
+ }
+ if (!count)
+ return;
+
+ APR_RING_UNSPLICE(first, last, timeout_list);
+ AP_DEBUG_ASSERT(q->count >= count);
+ q->count -= count;
+ while (count) {
+ cs = APR_RING_NEXT(first, timeout_list);
+ TO_QUEUE_ELEM_INIT(first);
+ func(first, NULL);
+ first = cs;
+ count--;
+ }
+}
+
+static void * APR_THREAD_FUNC listener_thread(apr_thread_t * thd, void *dummy)
+{
+ timer_event_t *ep;
+ timer_event_t *te;
+ apr_status_t rc;
+ proc_info *ti = dummy;
+ int process_slot = ti->pid;
+ apr_pool_t *tpool = apr_thread_pool_get(thd);
+ void *csd = NULL;
+ apr_pool_t *ptrans; /* Pool for per-transaction stuff */
+ ap_listen_rec *lr;
+ int have_idle_worker = 0;
+ event_conn_state_t *cs;
+ const apr_pollfd_t *out_pfd;
+ apr_int32_t num = 0;
+ apr_interval_time_t timeout_interval;
+ apr_time_t timeout_time = 0, now, last_log;
+ listener_poll_type *pt;
+ int closed = 0, listeners_disabled = 0;
+
+ last_log = apr_time_now();
+ free(ti);
+
+ /* the following times out events that are really close in the future
+ * to prevent extra poll calls
+ *
+ * current value is .1 second
+ */
+#define TIMEOUT_FUDGE_FACTOR 100000
+#define EVENT_FUDGE_FACTOR 10000
+
+ rc = init_pollset(tpool);
+ if (rc != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+ "failed to initialize pollset, "
+ "attempting to shutdown process gracefully");
+ signal_threads(ST_GRACEFUL);
+ return NULL;
+ }
+
+ /* Unblock the signal used to wake this thread up, and set a handler for
+ * it.
+ */
+ unblock_signal(LISTENER_SIGNAL);
+ apr_signal(LISTENER_SIGNAL, dummy_signal_handler);
+
+ for (;;) {
+ int workers_were_busy = 0;
+ if (listener_may_exit) {
+ close_listeners(process_slot, &closed);
+ if (terminate_mode == ST_UNGRACEFUL
+ || apr_atomic_read32(&connection_count) == 0)
+ break;
+ }
+
+ if (requests_this_child <= 0) {
+ check_infinite_requests();
+ }
+
+ now = apr_time_now();
+ if (APLOGtrace6(ap_server_conf)) {
+ /* trace log status every second */
+ if (now - last_log > apr_time_from_msec(1000)) {
+ last_log = now;
+ ap_log_error(APLOG_MARK, APLOG_TRACE6, 0, ap_server_conf,
+ "connections: %d (write-completion: %d "
+ "keep-alive: %d lingering: %d)",
+ connection_count, write_completion_q.count,
+ keepalive_q.count,
+ linger_q.count + short_linger_q.count);
+ }
+ }
+
+ apr_thread_mutex_lock(g_timer_ring_mtx);
+ if (!APR_RING_EMPTY(&timer_ring, timer_event_t, link)) {
+ te = APR_RING_FIRST(&timer_ring);
+ if (te->when > now) {
+ timeout_interval = te->when - now;
+ }
+ else {
+ timeout_interval = 1;
+ }
+ }
+ else {
+ timeout_interval = apr_time_from_msec(100);
+ }
+ apr_thread_mutex_unlock(g_timer_ring_mtx);
+
+#if HAVE_SERF
+ rc = serf_context_prerun(g_serf);
+ if (rc != APR_SUCCESS) {
+ /* TOOD: what should do here? ugh. */
+ }
+#endif
+ rc = apr_pollset_poll(event_pollset, timeout_interval, &num, &out_pfd);
+ if (rc != APR_SUCCESS
+ && !APR_STATUS_IS_EINTR(rc)
+ && !APR_STATUS_IS_TIMEUP(rc)) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc, ap_server_conf,
+ "apr_pollset_poll failed. Attempting to "
+ "shutdown process gracefully");
+ signal_threads(ST_GRACEFUL);
+ }
+
+ if (listener_may_exit) {
+ close_listeners(process_slot, &closed);
+ if (terminate_mode == ST_UNGRACEFUL
+ || apr_atomic_read32(&connection_count) == 0)
+ break;
+ }
+
+ now = apr_time_now();
+ apr_thread_mutex_lock(g_timer_ring_mtx);
+ for (ep = APR_RING_FIRST(&timer_ring);
+ ep != APR_RING_SENTINEL(&timer_ring,
+ timer_event_t, link);
+ ep = APR_RING_FIRST(&timer_ring))
+ {
+ if (ep->when < now + EVENT_FUDGE_FACTOR) {
+ APR_RING_REMOVE(ep, link);
+ push_timer2worker(ep);
+ }
+ else {
+ break;
+ }
+ }
+ apr_thread_mutex_unlock(g_timer_ring_mtx);
+
+ while (num) {
+ pt = (listener_poll_type *) out_pfd->client_data;
+ if (pt->type == PT_CSD) {
+ /* one of the sockets is readable */
+ struct timeout_queue *remove_from_q = &write_completion_q;
+ int blocking = 1;
+ cs = (event_conn_state_t *)pt->baton;
+ switch (cs->pub.state) {
+ case CONN_STATE_CHECK_REQUEST_LINE_READABLE:
+ cs->pub.state = CONN_STATE_READ_REQUEST_LINE;
+ remove_from_q = &keepalive_q;
+ /* don't wait for a worker for a keepalive request */
+ blocking = 0;
+ /* FALL THROUGH */
+ case CONN_STATE_WRITE_COMPLETION:
+ get_worker(&have_idle_worker, blocking,
+ &workers_were_busy);
+ TO_QUEUE_REMOVE(*remove_from_q, cs);
+ rc = apr_pollset_remove(event_pollset, &cs->pfd);
+
+ /*
+ * Some of the pollset backends, like KQueue or Epoll
+ * automagically remove the FD if the socket is closed,
+ * therefore, we can accept _SUCCESS or _NOTFOUND,
+ * and we still want to keep going
+ */
+ if (rc != APR_SUCCESS && !APR_STATUS_IS_NOTFOUND(rc)) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rc, ap_server_conf,
+ "pollset remove failed");
+ start_lingering_close(cs, NULL);
+ break;
+ }
+
+ TO_QUEUE_ELEM_INIT(cs);
+ /* If we didn't get a worker immediately for a keep-alive
+ * request, we close the connection, so that the client can
+ * re-connect to a different process.
+ */
+ if (!have_idle_worker) {
+ start_lingering_close(cs, NULL);
+ break;
+ }
+ rc = push2worker(out_pfd, event_pollset);
+ if (rc != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf, "push2worker failed");
+ }
+ else {
+ have_idle_worker = 0;
+ }
+ break;
+ case CONN_STATE_LINGER_NORMAL:
+ case CONN_STATE_LINGER_SHORT:
+ process_lingering_close(cs, out_pfd);
+ break;
+ default:
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf,
+ "event_loop: unexpected state %d",
+ cs->pub.state);
+ ap_assert(0);
+ }
+ }
+ else if (pt->type == PT_ACCEPT) {
+ int skip_accept = 0;
+ int connection_count_local = connection_count;
+
+ /* A Listener Socket is ready for an accept() */
+ if (workers_were_busy) {
+ skip_accept = 1;
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+ "All workers busy, not accepting new conns"
+ "in this process");
+ }
+ else if (listeners_disabled) {
+ listeners_disabled = 0;
+ enable_listensocks(process_slot);
+ }
+ else if (connection_count_local > threads_per_child
+ + ap_queue_info_get_idlers(worker_queue_info) *
+ worker_factor / WORKER_FACTOR_SCALE)
+ {
+ skip_accept = 1;
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+ "Too many open connections (%u), "
+ "not accepting new conns in this process",
+ connection_count_local);
+ ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
+ "Idle workers: %u",
+ ap_queue_info_get_idlers(worker_queue_info));
+ }
+
+ if (skip_accept == 0) {
+ lr = (ap_listen_rec *) pt->baton;
+ ap_pop_pool(&ptrans, worker_queue_info);
+
+ if (ptrans == NULL) {
+ /* create a new transaction pool for each accepted socket */
+ apr_allocator_t *allocator;
+
+ apr_allocator_create(&allocator);
+ apr_allocator_max_free_set(allocator,
+ ap_max_mem_free);
+ apr_pool_create_ex(&ptrans, pconf, NULL, allocator);
+ apr_allocator_owner_set(allocator, ptrans);
+ if (ptrans == NULL) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf,
+ "Failed to create transaction pool");
+ signal_threads(ST_GRACEFUL);
+ return NULL;
+ }
+ }
+ apr_pool_tag(ptrans, "transaction");
+
+ get_worker(&have_idle_worker, 1, &workers_were_busy);
+ rc = lr->accept_func(&csd, lr, ptrans);
+
+ /* later we trash rv and rely on csd to indicate
+ * success/failure
+ */
+ AP_DEBUG_ASSERT(rc == APR_SUCCESS || !csd);
+
+ if (rc == APR_EGENERAL) {
+ /* E[NM]FILE, ENOMEM, etc */
+ resource_shortage = 1;
+ signal_threads(ST_GRACEFUL);
+ }
+
+ if (csd != NULL) {
+ rc = ap_queue_push(worker_queue, csd, NULL, ptrans);
+ if (rc != APR_SUCCESS) {
+ /* trash the connection; we couldn't queue the connected
+ * socket to a worker
+ */
+ apr_socket_close(csd);
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rc,
+ ap_server_conf,
+ "ap_queue_push failed");
+ apr_pool_clear(ptrans);
+ ap_push_pool(worker_queue_info, ptrans);
+ }
+ else {
+ have_idle_worker = 0;
+ }
+ }
+ else {
+ apr_pool_clear(ptrans);
+ ap_push_pool(worker_queue_info, ptrans);
+ }
+ }
+ } /* if:else on pt->type */
+#if HAVE_SERF
+ else if (pt->type == PT_SERF) {
+ /* send socket to serf. */
+ /* XXXX: this doesn't require get_worker() */
+ serf_event_trigger(g_serf, pt->baton, out_pfd);
+ }
+#endif
+ out_pfd++;
+ num--;
+ } /* while for processing poll */
+
+ {
+ /* TODO: break out to separate function */
+ int i;
+
+ for (i = 0; i < threads_per_child; i++) {
+ ap_equeue_t *eq = worker_equeues[i];
+ pollset_op_t *op = NULL;
+
+ while ((op = ap_equeue_reader_next(eq)) != NULL) {
+ process_pollop(op);
+ }
+ }
+ }
+
+ /* XXX possible optimization: stash the current time for use as
+ * r->request_time for new requests
+ */
+ now = apr_time_now();
+ /* we only do this once per 0.1s (TIMEOUT_FUDGE_FACTOR) */
+ if (now > timeout_time) {
+ struct process_score *ps;
+ timeout_time = now + TIMEOUT_FUDGE_FACTOR;
+
+ /* handle timed out sockets */
+
+ /* Step 1: keepalive timeouts */
+ /* If all workers are busy, we kill older keep-alive connections so that they
+ * may connect to another process.
+ */
+ if (workers_were_busy && keepalive_q.count) {
+ ap_log_error(APLOG_MARK, APLOG_TRACE1, 0, ap_server_conf,
+ "All workers are busy, will close %d keep-alive "
+ "connections",
+ keepalive_q.count);
+ process_timeout_queue(&keepalive_q,
+ timeout_time + ap_server_conf->keep_alive_timeout,
+ start_lingering_close);
+ }
+ else {
+ process_timeout_queue(&keepalive_q, timeout_time,
+ start_lingering_close);
+ }
+ /* Step 2: write completion timeouts */
+ process_timeout_queue(&write_completion_q, timeout_time, start_lingering_close);
+ /* Step 3: (normal) lingering close completion timeouts */
+ process_timeout_queue(&linger_q, timeout_time, stop_lingering_close);
+ /* Step 4: (short) lingering close completion timeouts */
+ process_timeout_queue(&short_linger_q, timeout_time, stop_lingering_close);
+
+ ps = ap_get_scoreboard_process(process_slot);
+ ps->write_completion = write_completion_q.count;
+ ps->lingering_close = linger_q.count + short_linger_q.count;
+ ps->keep_alive = keepalive_q.count;
+
+ ps->connections = apr_atomic_read32(&connection_count);
+ /* XXX: should count CONN_STATE_SUSPENDED and set ps->suspended */
+ }
+ if (listeners_disabled && !workers_were_busy &&
+ (int)apr_atomic_read32(&connection_count) <
+ ((int)ap_queue_info_get_idlers(worker_queue_info) - 1) *
+ worker_factor / WORKER_FACTOR_SCALE + threads_per_child)
+ {
+ listeners_disabled = 0;
+ enable_listensocks(process_slot);
+ }
+ /*
+ * XXX: do we need to set some timeout that re-enables the listensocks
+ * XXX: in case no other event occurs?
+ */
+ } /* listener main loop */
+
+ close_listeners(process_slot, &closed);
+ ap_queue_term(worker_queue);
+
+ apr_thread_exit(thd, APR_SUCCESS);
+ return NULL;
+}
+
+/* XXX For ungraceful termination/restart, we definitely don't want to
+ * wait for active connections to finish but we may want to wait
+ * for idle workers to get out of the queue code and release mutexes,
+ * since those mutexes are cleaned up pretty soon and some systems
+ * may not react favorably (i.e., segfault) if operations are attempted
+ * on cleaned-up mutexes.
+ */
+static void *APR_THREAD_FUNC worker_thread(apr_thread_t * thd, void *dummy)
+{
+ proc_info *ti = dummy;
+ int process_slot = ti->pid;
+ int thread_slot = ti->tid;
+ apr_socket_t *csd = NULL;
+ event_conn_state_t *cs;
+ apr_pool_t *ptrans; /* Pool for per-transaction stuff */
+ apr_status_t rv;
+ int is_idle = 0;
+ timer_event_t *te = NULL;
+ ap_equeue_t *eq = worker_equeues[thread_slot];
+
+ free(ti);
+
+ ap_scoreboard_image->servers[process_slot][thread_slot].pid = ap_my_pid;
+ ap_scoreboard_image->servers[process_slot][thread_slot].tid = apr_os_thread_current();
+ ap_scoreboard_image->servers[process_slot][thread_slot].generation = retained->my_generation;
+ ap_update_child_status_from_indexes(process_slot, thread_slot,
+ SERVER_STARTING, NULL);
+
+ while (!workers_may_exit) {
+ if (!is_idle) {
+ rv = ap_queue_info_set_idle(worker_queue_info, NULL);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf,
+ "ap_queue_info_set_idle failed. Attempting to "
+ "shutdown process gracefully.");
+ signal_threads(ST_GRACEFUL);
+ break;
+ }
+ is_idle = 1;
+ }
+
+ ap_update_child_status_from_indexes(process_slot, thread_slot,
+ dying ? SERVER_GRACEFUL : SERVER_READY, NULL);
+ worker_pop:
+ if (workers_may_exit) {
+ break;
+ }
+
+ te = NULL;
+ rv = ap_queue_pop_something(worker_queue, &csd, &cs, &ptrans, &te);
+
+ if (rv != APR_SUCCESS) {
+ /* We get APR_EOF during a graceful shutdown once all the
+ * connections accepted by this server process have been handled.
+ */
+ if (APR_STATUS_IS_EOF(rv)) {
+ break;
+ }
+ /* We get APR_EINTR whenever ap_queue_pop() has been interrupted
+ * from an explicit call to ap_queue_interrupt_all(). This allows
+ * us to unblock threads stuck in ap_queue_pop() when a shutdown
+ * is pending.
+ *
+ * If workers_may_exit is set and this is ungraceful termination/
+ * restart, we are bound to get an error on some systems (e.g.,
+ * AIX, which sanity-checks mutex operations) since the queue
+ * may have already been cleaned up. Don't log the "error" if
+ * workers_may_exit is set.
+ */
+ else if (APR_STATUS_IS_EINTR(rv)) {
+ goto worker_pop;
+ }
+ /* We got some other error. */
+ else if (!workers_may_exit) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf,
+ "ap_queue_pop failed");
+ }
+ continue;
+ }
+ if (te != NULL) {
+ te->cbfunc(te->baton);
+
+ {
+ apr_thread_mutex_lock(g_timer_ring_mtx);
+ APR_RING_INSERT_TAIL(&timer_free_ring, te, timer_event_t, link);
+ apr_thread_mutex_unlock(g_timer_ring_mtx);
+ }
+ }
+ else {
+ is_idle = 0;
+ worker_sockets[thread_slot] = csd;
+ rv = process_socket(thd, ptrans, csd, cs, eq, process_slot, thread_slot);
+ if (!rv) {
+ requests_this_child--;
+ }
+ worker_sockets[thread_slot] = NULL;
+ }
+ }
+
+ ap_update_child_status_from_indexes(process_slot, thread_slot,
+ dying ? SERVER_DEAD :
+ SERVER_GRACEFUL,
+ (request_rec *) NULL);
+
+ apr_thread_exit(thd, APR_SUCCESS);
+ return NULL;
+}
+
+static int check_signal(int signum)
+{
+ switch (signum) {
+ case SIGTERM:
+ case SIGINT:
+ return 1;
+ }
+ return 0;
+}
+
+
+
+static void create_listener_thread(thread_starter * ts)
+{
+ int my_child_num = ts->child_num_arg;
+ apr_threadattr_t *thread_attr = ts->threadattr;
+ proc_info *my_info;
+ apr_status_t rv;
+
+ my_info = (proc_info *) ap_malloc(sizeof(proc_info));
+ my_info->pid = my_child_num;
+ my_info->tid = -1; /* listener thread doesn't have a thread slot */
+ my_info->sd = 0;
+ rv = apr_thread_create(&ts->listener, thread_attr, listener_thread,
+ my_info, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00474)
+ "apr_thread_create: unable to create listener thread");
+ /* let the parent decide how bad this really is */
+ clean_child_exit(APEXIT_CHILDSICK);
+ }
+ apr_os_thread_get(&listener_os_thread, ts->listener);
+}
+
+/* XXX under some circumstances not understood, children can get stuck
+ * in start_threads forever trying to take over slots which will
+ * never be cleaned up; for now there is an APLOG_DEBUG message issued
+ * every so often when this condition occurs
+ */
+static void *APR_THREAD_FUNC start_threads(apr_thread_t * thd, void *dummy)
+{
+ thread_starter *ts = dummy;
+ apr_thread_t **threads = ts->threads;
+ apr_threadattr_t *thread_attr = ts->threadattr;
+ int child_num_arg = ts->child_num_arg;
+ int my_child_num = child_num_arg;
+ proc_info *my_info;
+ apr_status_t rv;
+ int i;
+ int threads_created = 0;
+ int listener_started = 0;
+ int loops;
+ int prev_threads_created;
+ int max_recycled_pools = -1;
+
+ /* We must create the fd queues before we start up the listener
+ * and worker threads. */
+ worker_queue = apr_pcalloc(pchild, sizeof(*worker_queue));
+ rv = ap_queue_init(worker_queue, threads_per_child, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "ap_queue_init() failed");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ if (ap_max_mem_free != APR_ALLOCATOR_MAX_FREE_UNLIMITED) {
+ /* If we want to conserve memory, let's not keep an unlimited number of
+ * pools & allocators.
+ * XXX: This should probably be a separate config directive
+ */
+ max_recycled_pools = threads_per_child * 3 / 4 ;
+ }
+ rv = ap_queue_info_create(&worker_queue_info, pchild,
+ threads_per_child, max_recycled_pools);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "ap_queue_info_create() failed");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ /* Create the main pollset */
+ rv = apr_pollset_create(&event_pollset,
+ threads_per_child, /* XXX don't we need more, to handle
+ * connections in K-A or lingering
+ * close?
+ */
+ pchild, APR_POLLSET_WAKEABLE|APR_POLLSET_NOCOPY);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, rv, ap_server_conf,
+ "apr_pollset_create failed; check system or user limits");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ worker_sockets = apr_pcalloc(pchild, threads_per_child
+ * sizeof(apr_socket_t *));
+
+ worker_equeues = apr_palloc(pchild, threads_per_child * sizeof(ap_equeue_t*));
+
+ for (i = 0; i < threads_per_child; i++) {
+ ap_equeue_t* eq = NULL;
+ /* TODO: research/test optimal size of queue here */
+ ap_equeue_create(pchild, 16, sizeof(pollset_op_t), &eq);
+ /* same as thread ID */
+ worker_equeues[i] = eq;
+ }
+
+ loops = prev_threads_created = 0;
+ while (1) {
+ /* threads_per_child does not include the listener thread */
+ for (i = 0; i < threads_per_child; i++) {
+ int status =
+ ap_scoreboard_image->servers[child_num_arg][i].status;
+
+ if (status != SERVER_GRACEFUL && status != SERVER_DEAD) {
+ continue;
+ }
+
+ my_info = (proc_info *) ap_malloc(sizeof(proc_info));
+ my_info->pid = my_child_num;
+ my_info->tid = i;
+ my_info->sd = 0;
+
+ /* We are creating threads right now */
+ ap_update_child_status_from_indexes(my_child_num, i,
+ SERVER_STARTING, NULL);
+ /* We let each thread update its own scoreboard entry. This is
+ * done because it lets us deal with tid better.
+ */
+ rv = apr_thread_create(&threads[i], thread_attr,
+ worker_thread, my_info, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf,
+ "apr_thread_create: unable to create worker thread");
+ /* let the parent decide how bad this really is */
+ clean_child_exit(APEXIT_CHILDSICK);
+ }
+ threads_created++;
+ }
+
+ /* Start the listener only when there are workers available */
+ if (!listener_started && threads_created) {
+ create_listener_thread(ts);
+ listener_started = 1;
+ }
+
+
+ if (start_thread_may_exit || threads_created == threads_per_child) {
+ break;
+ }
+ /* wait for previous generation to clean up an entry */
+ apr_sleep(apr_time_from_sec(1));
+ ++loops;
+ if (loops % 120 == 0) { /* every couple of minutes */
+ if (prev_threads_created == threads_created) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
+ "child %" APR_PID_T_FMT " isn't taking over "
+ "slots very quickly (%d of %d)",
+ ap_my_pid, threads_created,
+ threads_per_child);
+ }
+ prev_threads_created = threads_created;
+ }
+ }
+
+ /* What state should this child_main process be listed as in the
+ * scoreboard...?
+ * ap_update_child_status_from_indexes(my_child_num, i, SERVER_STARTING,
+ * (request_rec *) NULL);
+ *
+ * This state should be listed separately in the scoreboard, in some kind
+ * of process_status, not mixed in with the worker threads' status.
+ * "life_status" is almost right, but it's in the worker's structure, and
+ * the name could be clearer. gla
+ */
+ apr_thread_exit(thd, APR_SUCCESS);
+ return NULL;
+}
+
+static void join_workers(apr_thread_t * listener, apr_thread_t ** threads)
+{
+ int i;
+ apr_status_t rv, thread_rv;
+
+ if (listener) {
+ int iter;
+
+ /* deal with a rare timing window which affects waking up the
+ * listener thread... if the signal sent to the listener thread
+ * is delivered between the time it verifies that the
+ * listener_may_exit flag is clear and the time it enters a
+ * blocking syscall, the signal didn't do any good... work around
+ * that by sleeping briefly and sending it again
+ */
+
+ iter = 0;
+ while (iter < 10 && !dying) {
+ /* listener has not stopped accepting yet */
+ apr_sleep(apr_time_make(0, 500000));
+ wakeup_listener();
+ ++iter;
+ }
+ if (iter >= 10) {
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf, APLOGNO(00475)
+ "the listener thread didn't stop accepting");
+ }
+ else {
+ rv = apr_thread_join(&thread_rv, listener);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00476)
+ "apr_thread_join: unable to join listener thread");
+ }
+ }
+ }
+
+ for (i = 0; i < threads_per_child; i++) {
+ if (threads[i]) { /* if we ever created this thread */
+ rv = apr_thread_join(&thread_rv, threads[i]);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00477)
+ "apr_thread_join: unable to join worker "
+ "thread %d", i);
+ }
+ }
+ }
+}
+
+static void join_start_thread(apr_thread_t * start_thread_id)
+{
+ apr_status_t rv, thread_rv;
+
+ start_thread_may_exit = 1; /* tell it to give up in case it is still
+ * trying to take over slots from a
+ * previous generation
+ */
+ rv = apr_thread_join(&thread_rv, start_thread_id);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, ap_server_conf, APLOGNO(00478)
+ "apr_thread_join: unable to join the start " "thread");
+ }
+}
+
+static void child_main(int child_num_arg)
+{
+ apr_thread_t **threads;
+ apr_status_t rv;
+ thread_starter *ts;
+ apr_threadattr_t *thread_attr;
+ apr_thread_t *start_thread_id;
+
+ mpm_state = AP_MPMQ_STARTING; /* for benefit of any hooks that run as this
+ * child initializes
+ */
+ ap_my_pid = getpid();
+ ap_fatal_signal_child_setup(ap_server_conf);
+ apr_pool_create(&pchild, pconf);
+
+ /*stuff to do before we switch id's, so we have permissions. */
+ ap_reopen_scoreboard(pchild, NULL, 0);
+
+ if (ap_run_drop_privileges(pchild, ap_server_conf)) {
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ apr_thread_mutex_create(&g_timer_ring_mtx, APR_THREAD_MUTEX_DEFAULT, pchild);
+ APR_RING_INIT(&timer_free_ring, timer_event_t, link);
+ APR_RING_INIT(&timer_ring, timer_event_t, link);
+ ap_run_child_init(pchild, ap_server_conf);
+
+ /* done with init critical section */
+
+ /* Just use the standard apr_setup_signal_thread to block all signals
+ * from being received. The child processes no longer use signals for
+ * any communication with the parent process.
+ */
+ rv = apr_setup_signal_thread();
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_EMERG, rv, ap_server_conf, APLOGNO(00479)
+ "Couldn't initialize signal thread");
+ clean_child_exit(APEXIT_CHILDFATAL);
+ }
+
+ if (ap_max_requests_per_child) {
+ requests_this_child = ap_max_requests_per_child;
+ }
+ else {
+ /* coding a value of zero means infinity */
+ requests_this_child = INT_MAX;
+ }
+
+ /* Setup worker threads */
+
+ /* clear the storage; we may not create all our threads immediately,
+ * and we want a 0 entry to indicate a thread which was not created
+ */
+ threads = ap_calloc(threads_per_child, sizeof(apr_thread_t *));
+ ts = apr_palloc(pchild, sizeof(*ts));
+
+ apr_threadattr_create(&thread_attr, pchild);
+ /* 0 means PTHREAD_CREATE_JOINABLE */
+ apr_threadattr_detach_set(thread_attr, 0);
+
+ if (ap_thread_stacksize != 0) {
+ apr_threadattr_stacksize_set(thread_attr, ap_thread_stacksize);
+ }
+
+ ts->threads = threads;
+ ts->listener = NULL;
+ ts->child_num_arg = child_num_arg;
+ ts->threadattr = thread_attr;
+
+ rv = apr_thread_create(&start_thread_id, thread_attr, start_threads,
+ ts, pchild);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT, rv, ap_server_conf, APLOGNO(00480)
+ "apr_thread_create: unable to create worker thread");
+ /* let the parent decide how bad this really is */
+ clean_child_exit(APEXIT_CHILDSICK);
+ }
+
+ mpm_state = AP_MPMQ_RUNNING;
+
+ /* If we are only running in one_process mode, we will want to
+ * still handle signals. */
+ if (one_process) {
+ /* Block until we get a terminating signal. */
+ apr_signal_thread(check_signal);
+ /* make sure the start thread has finished; signal_threads()
+ * and join_workers() depend on that
+ */
+ /* XXX join_start_thread() won't be awakened if one of our
+ * threads encounters a critical error and attempts to
+ * shutdown this child
+ */
+ join_start_thread(start_thread_id);
+
+ /* helps us terminate a little more quickly than the dispatch of the
+ * signal thread; beats the Pipe of Death and the browsers
+ */
+ signal_threads(ST_UNGRACEFUL);
+
+ /* A terminating signal was received. Now join each of the
+ * workers to clean them up.
+ * If the worker already exited, then the join frees
+ * their resources and returns.
+ * If the worker hasn't exited, then this blocks until
+ * they have (then cleans up).
+ */
+ join_workers(ts->listener, threads);
+ }
+ else { /* !one_process */
+ /* remove SIGTERM from the set of blocked signals... if one of
+ * the other threads in the process needs to take us down
+ * (e.g., for MaxConnectionsPerChild) it will send us SIGTERM
+ */
+ unblock_signal(SIGTERM);
+ apr_signal(SIGTERM, dummy_signal_handler);
+ /* Watch for any messages from the parent over the POD */
+ while (1) {
+ rv = ap_eventopt_pod_check(pod);
+ if (rv == AP_NORESTART) {
+ /* see if termination was triggered while we slept */
+ switch (terminate_mode) {
+ case ST_GRACEFUL:
+ rv = AP_GRACEFUL;
+ break;
+ case ST_UNGRACEFUL:
+ rv = AP_RESTART;
+ break;
+ }
+ }
+ if (rv == AP_GRACEFUL || rv == AP_RESTART) {
+ /* make sure the start thread has finished;
+ * signal_threads() and join_workers depend on that
+ */
+ join_start_thread(start_thread_id);
+ signal_threads(rv ==
+ AP_GRACEFUL ? ST_GRACEFUL : ST_UNGRACEFUL);
+ break;
+ }
+ }
+
+ /* A terminating signal was received. Now join each of the
+ * workers to clean them up.
+ * If the worker already exited, then the join frees
+ * their resources and returns.
+ * If the worker hasn't exited, then this blocks until
+ * they have (then cleans up).
+ */
+ join_workers(ts->listener, threads);
+ }
+
+ free(threads);
+
+ clean_child_exit(resource_shortage ? APEXIT_CHILDSICK : 0);
+}
+
+static int make_child(server_rec * s, int slot)
+{
+ int pid;
+
+ if (slot + 1 > retained->max_daemons_limit) {
+ retained->max_daemons_limit = slot + 1;
+ }
+
+ if (one_process) {
+ set_signals();
+ event_note_child_started(slot, getpid());
+ child_main(slot);
+ /* NOTREACHED */
+ }
+
+ if ((pid = fork()) == -1) {
+ ap_log_error(APLOG_MARK, APLOG_ERR, errno, s, APLOGNO(00481)
+ "fork: Unable to fork new process");
+
+ /* fork didn't succeed. There's no need to touch the scoreboard;
+ * if we were trying to replace a failed child process, then
+ * server_main_loop() marked its workers SERVER_DEAD, and if
+ * we were trying to replace a child process that exited normally,
+ * its worker_thread()s left SERVER_DEAD or SERVER_GRACEFUL behind.
+ */
+
+ /* In case system resources are maxxed out, we don't want
+ Apache running away with the CPU trying to fork over and
+ over and over again. */
+ apr_sleep(apr_time_from_sec(10));
+
+ return -1;
+ }
+
+ if (!pid) {
+#ifdef HAVE_BINDPROCESSOR
+ /* By default, AIX binds to a single processor. This bit unbinds
+ * children which will then bind to another CPU.
+ */
+ int status = bindprocessor(BINDPROCESS, (int) getpid(),
+ PROCESSOR_CLASS_ANY);
+ if (status != OK)
+ ap_log_error(APLOG_MARK, APLOG_DEBUG, errno,
+ ap_server_conf, APLOGNO(00482)
+ "processor unbind failed");
+#endif
+ RAISE_SIGSTOP(MAKE_CHILD);
+
+ apr_signal(SIGTERM, just_die);
+ child_main(slot);
+ /* NOTREACHED */
+ }
+ /* else */
+ if (ap_scoreboard_image->parent[slot].pid != 0) {
+ /* This new child process is squatting on the scoreboard
+ * entry owned by an exiting child process, which cannot
+ * exit until all active requests complete.
+ */
+ event_note_child_lost_slot(slot, pid);
+ }
+ ap_scoreboard_image->parent[slot].quiescing = 0;
+ ap_scoreboard_image->parent[slot].not_accepting = 0;
+ event_note_child_started(slot, pid);
+ return 0;
+}
+
+/* start up a bunch of children */
+static void startup_children(int number_to_start)
+{
+ int i;
+
+ for (i = 0; number_to_start && i < ap_daemons_limit; ++i) {
+ if (ap_scoreboard_image->parent[i].pid != 0) {
+ continue;
+ }
+ if (make_child(ap_server_conf, i) < 0) {
+ break;
+ }
+ --number_to_start;
+ }
+}
+
+static void perform_idle_server_maintenance(void)
+{
+ int i, j;
+ int idle_thread_count;
+ worker_score *ws;
+ process_score *ps;
+ int free_length;
+ int totally_free_length = 0;
+ int free_slots[MAX_SPAWN_RATE];
+ int last_non_dead;
+ int total_non_dead;
+ int active_thread_count = 0;
+
+ /* initialize the free_list */
+ free_length = 0;
+
+ idle_thread_count = 0;
+ last_non_dead = -1;
+ total_non_dead = 0;
+
+ for (i = 0; i < ap_daemons_limit; ++i) {
+ /* Initialization to satisfy the compiler. It doesn't know
+ * that threads_per_child is always > 0 */
+ int status = SERVER_DEAD;
+ int any_dying_threads = 0;
+ int any_dead_threads = 0;
+ int all_dead_threads = 1;
+
+ if (i >= retained->max_daemons_limit
+ && totally_free_length == retained->idle_spawn_rate)
+ /* short cut if all active processes have been examined and
+ * enough empty scoreboard slots have been found
+ */
+
+ break;
+ ps = &ap_scoreboard_image->parent[i];
+ for (j = 0; j < threads_per_child; j++) {
+ ws = &ap_scoreboard_image->servers[i][j];
+ status = ws->status;
+
+ /* XXX any_dying_threads is probably no longer needed GLA */
+ any_dying_threads = any_dying_threads ||
+ (status == SERVER_GRACEFUL);
+ any_dead_threads = any_dead_threads || (status == SERVER_DEAD);
+ all_dead_threads = all_dead_threads &&
+ (status == SERVER_DEAD || status == SERVER_GRACEFUL);
+
+ /* We consider a starting server as idle because we started it
+ * at least a cycle ago, and if it still hasn't finished starting
+ * then we're just going to swamp things worse by forking more.
+ * So we hopefully won't need to fork more if we count it.
+ * This depends on the ordering of SERVER_READY and SERVER_STARTING.
+ */
+ if (ps->pid != 0) { /* XXX just set all_dead_threads in outer
+ for loop if no pid? not much else matters */
+ if (status <= SERVER_READY && !ps->quiescing && !ps->not_accepting
+ && ps->generation == retained->my_generation)
+ {
+ ++idle_thread_count;
+ }
+ if (status >= SERVER_READY && status < SERVER_GRACEFUL) {
+ ++active_thread_count;
+ }
+ }
+ }
+ if (any_dead_threads
+ && totally_free_length < retained->idle_spawn_rate
+ && free_length < MAX_SPAWN_RATE
+ && (!ps->pid /* no process in the slot */
+ || ps->quiescing)) { /* or at least one is going away */
+ if (all_dead_threads) {
+ /* great! we prefer these, because the new process can
+ * start more threads sooner. So prioritize this slot
+ * by putting it ahead of any slots with active threads.
+ *
+ * first, make room by moving a slot that's potentially still
+ * in use to the end of the array
+ */
+ free_slots[free_length] = free_slots[totally_free_length];
+ free_slots[totally_free_length++] = i;
+ }
+ else {
+ /* slot is still in use - back of the bus
+ */
+ free_slots[free_length] = i;
+ }
+ ++free_length;
+ }
+ /* XXX if (!ps->quiescing) is probably more reliable GLA */
+ if (!any_dying_threads) {
+ last_non_dead = i;
+ ++total_non_dead;
+ }
+ }
+
+ if (retained->sick_child_detected) {
+ if (active_thread_count > 0) {
+ /* some child processes appear to be working. don't kill the
+ * whole server.
+ */
+ retained->sick_child_detected = 0;
+ }
+ else {
+ /* looks like a basket case. give up.
+ */
+ shutdown_pending = 1;
+ child_fatal = 1;
+ ap_log_error(APLOG_MARK, APLOG_ALERT, 0,
+ ap_server_conf, APLOGNO(00483)
+ "No active workers found..."
+ " Apache is exiting!");
+ /* the child already logged the failure details */
+ return;
+ }
+ }
+
+ retained->max_daemons_limit = last_non_dead + 1;
+
+ if (idle_thread_count > max_spare_threads) {
+ /* Kill off one child */
+ ap_eventopt_pod_signal(pod, TRUE);
+ retained->idle_spawn_rate = 1;
+ }
+ else if (idle_thread_count < min_spare_threads) {
+ /* terminate the free list */
+ if (free_length == 0) { /* scoreboard is full, can't fork */
+
+ if (active_thread_count >= ap_daemons_limit * threads_per_child) {
+ if (!retained->maxclients_reported) {
+ /* only report this condition once */
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00484)
+ "server reached MaxRequestWorkers setting, "
+ "consider raising the MaxRequestWorkers "
+ "setting");
+ retained->maxclients_reported = 1;
+ }
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_ERR, 0, ap_server_conf, APLOGNO(00485)
+ "scoreboard is full, not at MaxRequestWorkers");
+ }
+ retained->idle_spawn_rate = 1;
+ }
+ else {
+ if (free_length > retained->idle_spawn_rate) {
+ free_length = retained->idle_spawn_rate;
+ }
+ if (retained->idle_spawn_rate >= 8) {
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00486)
+ "server seems busy, (you may need "
+ "to increase StartServers, ThreadsPerChild "
+ "or Min/MaxSpareThreads), "
+ "spawning %d children, there are around %d idle "
+ "threads, and %d total children", free_length,
+ idle_thread_count, total_non_dead);
+ }
+ for (i = 0; i < free_length; ++i) {
+ make_child(ap_server_conf, free_slots[i]);
+ }
+ /* the next time around we want to spawn twice as many if this
+ * wasn't good enough, but not if we've just done a graceful
+ */
+ if (retained->hold_off_on_exponential_spawning) {
+ --retained->hold_off_on_exponential_spawning;
+ }
+ else if (retained->idle_spawn_rate < MAX_SPAWN_RATE) {
+ retained->idle_spawn_rate *= 2;
+ }
+ }
+ }
+ else {
+ retained->idle_spawn_rate = 1;
+ }
+}
+
+static void server_main_loop(int remaining_children_to_start)
+{
+ ap_generation_t old_gen;
+ int child_slot;
+ apr_exit_why_e exitwhy;
+ int status, processed_status;
+ apr_proc_t pid;
+ int i;
+
+ while (!restart_pending && !shutdown_pending) {
+ ap_wait_or_timeout(&exitwhy, &status, &pid, pconf, ap_server_conf);
+
+ if (pid.pid != -1) {
+ processed_status = ap_process_child_status(&pid, exitwhy, status);
+ child_slot = ap_find_child_by_pid(&pid);
+ if (processed_status == APEXIT_CHILDFATAL) {
+ /* fix race condition found in PR 39311
+ * A child created at the same time as a graceful happens
+ * can find the lock missing and create a fatal error.
+ * It is not fatal for the last generation to be in this state.
+ */
+ if (child_slot < 0
+ || ap_get_scoreboard_process(child_slot)->generation
+ == retained->my_generation) {
+ shutdown_pending = 1;
+ child_fatal = 1;
+ return;
+ }
+ else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, ap_server_conf, APLOGNO(00487)
+ "Ignoring fatal error in child of previous "
+ "generation (pid %ld).",
+ (long)pid.pid);
+ retained->sick_child_detected = 1;
+ }
+ }
+ else if (processed_status == APEXIT_CHILDSICK) {
+ /* tell perform_idle_server_maintenance to check into this
+ * on the next timer pop
+ */
+ retained->sick_child_detected = 1;
+ }
+ /* non-fatal death... note that it's gone in the scoreboard. */
+ if (child_slot >= 0) {
+ for (i = 0; i < threads_per_child; i++)
+ ap_update_child_status_from_indexes(child_slot, i,
+ SERVER_DEAD,
+ (request_rec *) NULL);
+
+ event_note_child_killed(child_slot, 0, 0);
+ ap_scoreboard_image->parent[child_slot].quiescing = 0;
+ if (processed_status == APEXIT_CHILDSICK) {
+ /* resource shortage, minimize the fork rate */
+ retained->idle_spawn_rate = 1;
+ }
+ else if (remaining_children_to_start
+ && child_slot < ap_daemons_limit) {
+ /* we're still doing a 1-for-1 replacement of dead
+ * children with new children
+ */
+ make_child(ap_server_conf, child_slot);
+ --remaining_children_to_start;
+ }
+ }
+ else if (ap_unregister_extra_mpm_process(pid.pid, &old_gen) == 1) {
+
+ event_note_child_killed(-1, /* already out of the scoreboard */
+ pid.pid, old_gen);
+#if APR_HAS_OTHER_CHILD
+ }
+ else if (apr_proc_other_child_alert(&pid, APR_OC_REASON_DEATH,
+ status) == 0) {
+ /* handled */
+#endif
+ }
+ else if (retained->is_graceful) {
+ /* Great, we've probably just lost a slot in the
+ * scoreboard. Somehow we don't know about this child.
+ */
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0,
+ ap_server_conf, APLOGNO(00488)
+ "long lost child came home! (pid %ld)",
+ (long) pid.pid);
+ }
+ /* Don't perform idle maintenance when a child dies,
+ * only do it when there's a timeout. Remember only a
+ * finite number of children can die, and it's pretty
+ * pathological for a lot to die suddenly.
+ */
+ continue;
+ }
+ else if (remaining_children_to_start) {
+ /* we hit a 1 second timeout in which none of the previous
+ * generation of children needed to be reaped... so assume
+ * they're all done, and pick up the slack if any is left.
+ */
+ startup_children(remaining_children_to_start);
+ remaining_children_to_start = 0;
+ /* In any event we really shouldn't do the code below because
+ * few of the servers we just started are in the IDLE state
+ * yet, so we'd mistakenly create an extra server.
+ */
+ continue;
+ }
+
+ perform_idle_server_maintenance();
+ }
+}
+
+static int event_run(apr_pool_t * _pconf, apr_pool_t * plog, server_rec * s)
+{
+ int remaining_children_to_start;
+
+ ap_log_pid(pconf, ap_pid_fname);
+
+ if (!retained->is_graceful) {
+ if (ap_run_pre_mpm(s->process->pool, SB_SHARED) != OK) {
+ mpm_state = AP_MPMQ_STOPPING;
+ return DONE;
+ }
+ /* fix the generation number in the global score; we just got a new,
+ * cleared scoreboard
+ */
+ ap_scoreboard_image->global->running_generation = retained->my_generation;
+ }
+
+ restart_pending = shutdown_pending = 0;
+ set_signals();
+ /* Don't thrash... */
+ if (max_spare_threads < min_spare_threads + threads_per_child)
+ max_spare_threads = min_spare_threads + threads_per_child;
+
+ /* If we're doing a graceful_restart then we're going to see a lot
+ * of children exiting immediately when we get into the main loop
+ * below (because we just sent them AP_SIG_GRACEFUL). This happens pretty
+ * rapidly... and for each one that exits we may start a new one, until
+ * there are at least min_spare_threads idle threads, counting across
+ * all children. But we may be permitted to start more children than
+ * that, so we'll just keep track of how many we're
+ * supposed to start up without the 1 second penalty between each fork.
+ */
+ remaining_children_to_start = ap_daemons_to_start;
+ if (remaining_children_to_start > ap_daemons_limit) {
+ remaining_children_to_start = ap_daemons_limit;
+ }
+ if (!retained->is_graceful) {
+ startup_children(remaining_children_to_start);
+ remaining_children_to_start = 0;
+ }
+ else {
+ /* give the system some time to recover before kicking into
+ * exponential mode */
+ retained->hold_off_on_exponential_spawning = 10;
+ }
+
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00489)
+ "%s configured -- resuming normal operations",
+ ap_get_server_description());
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, ap_server_conf, APLOGNO(00490)
+ "Server built: %s", ap_get_server_built());
+ ap_log_command_line(plog, s);
+
+ mpm_state = AP_MPMQ_RUNNING;
+
+ server_main_loop(remaining_children_to_start);
+ mpm_state = AP_MPMQ_STOPPING;
+
+ if (shutdown_pending && !retained->is_graceful) {
+ /* Time to shut down:
+ * Kill child processes, tell them to call child_exit, etc...
+ */
+ ap_eventopt_pod_killpg(pod, ap_daemons_limit, FALSE);
+ ap_reclaim_child_processes(1, /* Start with SIGTERM */
+ event_note_child_killed);
+
+ if (!child_fatal) {
+ /* cleanup pid file on normal shutdown */
+ ap_remove_pid(pconf, ap_pid_fname);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0,
+ ap_server_conf, APLOGNO(00491) "caught SIGTERM, shutting down");
+ }
+ return DONE;
+ } else if (shutdown_pending) {
+ /* Time to gracefully shut down:
+ * Kill child processes, tell them to call child_exit, etc...
+ */
+ int active_children;
+ int index;
+ apr_time_t cutoff = 0;
+
+ /* Close our listeners, and then ask our children to do same */
+ ap_close_listeners();
+ ap_eventopt_pod_killpg(pod, ap_daemons_limit, TRUE);
+ ap_relieve_child_processes(event_note_child_killed);
+
+ if (!child_fatal) {
+ /* cleanup pid file on normal shutdown */
+ ap_remove_pid(pconf, ap_pid_fname);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00492)
+ "caught " AP_SIG_GRACEFUL_STOP_STRING
+ ", shutting down gracefully");
+ }
+
+ if (ap_graceful_shutdown_timeout) {
+ cutoff = apr_time_now() +
+ apr_time_from_sec(ap_graceful_shutdown_timeout);
+ }
+
+ /* Don't really exit until each child has finished */
+ shutdown_pending = 0;
+ do {
+ /* Pause for a second */
+ apr_sleep(apr_time_from_sec(1));
+
+ /* Relieve any children which have now exited */
+ ap_relieve_child_processes(event_note_child_killed);
+
+ active_children = 0;
+ for (index = 0; index < ap_daemons_limit; ++index) {
+ if (ap_mpm_safe_kill(MPM_CHILD_PID(index), 0) == APR_SUCCESS) {
+ active_children = 1;
+ /* Having just one child is enough to stay around */
+ break;
+ }
+ }
+ } while (!shutdown_pending && active_children &&
+ (!ap_graceful_shutdown_timeout || apr_time_now() < cutoff));
+
+ /* We might be here because we received SIGTERM, either
+ * way, try and make sure that all of our processes are
+ * really dead.
+ */
+ ap_eventopt_pod_killpg(pod, ap_daemons_limit, FALSE);
+ ap_reclaim_child_processes(1, event_note_child_killed);
+
+ return DONE;
+ }
+
+ /* we've been told to restart */
+ apr_signal(SIGHUP, SIG_IGN);
+
+ if (one_process) {
+ /* not worth thinking about */
+ return DONE;
+ }
+
+ /* advance to the next generation */
+ /* XXX: we really need to make sure this new generation number isn't in
+ * use by any of the children.
+ */
+ ++retained->my_generation;
+ ap_scoreboard_image->global->running_generation = retained->my_generation;
+
+ if (retained->is_graceful) {
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00493)
+ AP_SIG_GRACEFUL_STRING
+ " received. Doing graceful restart");
+ /* wake up the children...time to die. But we'll have more soon */
+ ap_eventopt_pod_killpg(pod, ap_daemons_limit, TRUE);
+
+
+ /* This is mostly for debugging... so that we know what is still
+ * gracefully dealing with existing request.
+ */
+
+ }
+ else {
+ /* Kill 'em all. Since the child acts the same on the parents SIGTERM
+ * and a SIGHUP, we may as well use the same signal, because some user
+ * pthreads are stealing signals from us left and right.
+ */
+ ap_eventopt_pod_killpg(pod, ap_daemons_limit, FALSE);
+
+ ap_reclaim_child_processes(1, /* Start with SIGTERM */
+ event_note_child_killed);
+ ap_log_error(APLOG_MARK, APLOG_NOTICE, 0, ap_server_conf, APLOGNO(00494)
+ "SIGHUP received. Attempting to restart");
+ }
+
+ return OK;
+}
+
+/* This really should be a post_config hook, but the error log is already
+ * redirected by that point, so we need to do this in the open_logs phase.
+ */
+static int event_open_logs(apr_pool_t * p, apr_pool_t * plog,
+ apr_pool_t * ptemp, server_rec * s)
+{
+ int startup = 0;
+ int level_flags = 0;
+ apr_status_t rv;
+
+ pconf = p;
+
+ /* the reverse of pre_config, we want this only the first time around */
+ if (retained->module_loads == 1) {
+ startup = 1;
+ level_flags |= APLOG_STARTUP;
+ }
+
+ if ((num_listensocks = ap_setup_listeners(ap_server_conf)) < 1) {
+ ap_log_error(APLOG_MARK, APLOG_ALERT | level_flags, 0,
+ (startup ? NULL : s),
+ "no listening sockets available, shutting down");
+ return DONE;
+ }
+
+ if (!one_process) {
+ if ((rv = ap_eventopt_pod_open(pconf, &pod))) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT | level_flags, rv,
+ (startup ? NULL : s),
+ "could not open pipe-of-death");
+ return DONE;
+ }
+ }
+ return OK;
+}
+
+static int event_pre_config(apr_pool_t * pconf, apr_pool_t * plog,
+ apr_pool_t * ptemp)
+{
+ int no_detach, debug, foreground;
+ apr_status_t rv;
+ const char *userdata_key = "mpm_eventopt_module";
+
+ mpm_state = AP_MPMQ_STARTING;
+
+ debug = ap_exists_config_define("DEBUG");
+
+ if (debug) {
+ foreground = one_process = 1;
+ no_detach = 0;
+ }
+ else {
+ one_process = ap_exists_config_define("ONE_PROCESS");
+ no_detach = ap_exists_config_define("NO_DETACH");
+ foreground = ap_exists_config_define("FOREGROUND");
+ }
+
+ /* sigh, want this only the second time around */
+ retained = ap_retained_data_get(userdata_key);
+ if (!retained) {
+ retained = ap_retained_data_create(userdata_key, sizeof(*retained));
+ retained->max_daemons_limit = -1;
+ retained->idle_spawn_rate = 1;
+ }
+ ++retained->module_loads;
+ if (retained->module_loads == 2) {
+ rv = apr_pollset_create(&event_pollset, 1, plog,
+ APR_POLLSET_WAKEABLE|APR_POLLSET_NOCOPY);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00495)
+ "apr_pollset_create failed; check system or user limits");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ apr_pollset_destroy(event_pollset);
+
+ if (!one_process && !foreground) {
+ /* before we detach, setup crash handlers to log to errorlog */
+ ap_fatal_signal_setup(ap_server_conf, pconf);
+ rv = apr_proc_detach(no_detach ? APR_PROC_DETACH_FOREGROUND
+ : APR_PROC_DETACH_DAEMONIZE);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, NULL, APLOGNO(00496)
+ "apr_proc_detach failed");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+ }
+ }
+
+ parent_pid = ap_my_pid = getpid();
+
+ ap_listen_pre_config();
+ ap_daemons_to_start = DEFAULT_START_DAEMON;
+ min_spare_threads = DEFAULT_MIN_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
+ max_spare_threads = DEFAULT_MAX_FREE_DAEMON * DEFAULT_THREADS_PER_CHILD;
+ server_limit = DEFAULT_SERVER_LIMIT;
+ thread_limit = DEFAULT_THREAD_LIMIT;
+ ap_daemons_limit = server_limit;
+ threads_per_child = DEFAULT_THREADS_PER_CHILD;
+ max_workers = ap_daemons_limit * threads_per_child;
+ ap_extended_status = 0;
+
+ return OK;
+}
+
+static int event_check_config(apr_pool_t *p, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ int startup = 0;
+
+ /* the reverse of pre_config, we want this only the first time around */
+ if (retained->module_loads == 1) {
+ startup = 1;
+ }
+
+ if (server_limit > MAX_SERVER_LIMIT) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00497)
+ "WARNING: ServerLimit of %d exceeds compile-time "
+ "limit of", server_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " %d servers, decreasing to %d.",
+ MAX_SERVER_LIMIT, MAX_SERVER_LIMIT);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00498)
+ "ServerLimit of %d exceeds compile-time limit "
+ "of %d, decreasing to match",
+ server_limit, MAX_SERVER_LIMIT);
+ }
+ server_limit = MAX_SERVER_LIMIT;
+ }
+ else if (server_limit < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00499)
+ "WARNING: ServerLimit of %d not allowed, "
+ "increasing to 1.", server_limit);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00500)
+ "ServerLimit of %d not allowed, increasing to 1",
+ server_limit);
+ }
+ server_limit = 1;
+ }
+
+ /* you cannot change ServerLimit across a restart; ignore
+ * any such attempts
+ */
+ if (!retained->first_server_limit) {
+ retained->first_server_limit = server_limit;
+ }
+ else if (server_limit != retained->first_server_limit) {
+ /* don't need a startup console version here */
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00501)
+ "changing ServerLimit to %d from original value of %d "
+ "not allowed during restart",
+ server_limit, retained->first_server_limit);
+ server_limit = retained->first_server_limit;
+ }
+
+ if (thread_limit > MAX_THREAD_LIMIT) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00502)
+ "WARNING: ThreadLimit of %d exceeds compile-time "
+ "limit of", thread_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " %d threads, decreasing to %d.",
+ MAX_THREAD_LIMIT, MAX_THREAD_LIMIT);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00503)
+ "ThreadLimit of %d exceeds compile-time limit "
+ "of %d, decreasing to match",
+ thread_limit, MAX_THREAD_LIMIT);
+ }
+ thread_limit = MAX_THREAD_LIMIT;
+ }
+ else if (thread_limit < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00504)
+ "WARNING: ThreadLimit of %d not allowed, "
+ "increasing to 1.", thread_limit);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00505)
+ "ThreadLimit of %d not allowed, increasing to 1",
+ thread_limit);
+ }
+ thread_limit = 1;
+ }
+
+ /* you cannot change ThreadLimit across a restart; ignore
+ * any such attempts
+ */
+ if (!retained->first_thread_limit) {
+ retained->first_thread_limit = thread_limit;
+ }
+ else if (thread_limit != retained->first_thread_limit) {
+ /* don't need a startup console version here */
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00506)
+ "changing ThreadLimit to %d from original value of %d "
+ "not allowed during restart",
+ thread_limit, retained->first_thread_limit);
+ thread_limit = retained->first_thread_limit;
+ }
+
+ if (threads_per_child > thread_limit) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00507)
+ "WARNING: ThreadsPerChild of %d exceeds ThreadLimit "
+ "of", threads_per_child);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " %d threads, decreasing to %d.",
+ thread_limit, thread_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " To increase, please see the ThreadLimit "
+ "directive.");
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00508)
+ "ThreadsPerChild of %d exceeds ThreadLimit "
+ "of %d, decreasing to match",
+ threads_per_child, thread_limit);
+ }
+ threads_per_child = thread_limit;
+ }
+ else if (threads_per_child < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00509)
+ "WARNING: ThreadsPerChild of %d not allowed, "
+ "increasing to 1.", threads_per_child);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00510)
+ "ThreadsPerChild of %d not allowed, increasing to 1",
+ threads_per_child);
+ }
+ threads_per_child = 1;
+ }
+
+ if (max_workers < threads_per_child) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00511)
+ "WARNING: MaxRequestWorkers of %d is less than "
+ "ThreadsPerChild of", max_workers);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " %d, increasing to %d. MaxRequestWorkers must be at "
+ "least as large",
+ threads_per_child, threads_per_child);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " as the number of threads in a single server.");
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00512)
+ "MaxRequestWorkers of %d is less than ThreadsPerChild "
+ "of %d, increasing to match",
+ max_workers, threads_per_child);
+ }
+ max_workers = threads_per_child;
+ }
+
+ ap_daemons_limit = max_workers / threads_per_child;
+
+ if (max_workers % threads_per_child) {
+ int tmp_max_workers = ap_daemons_limit * threads_per_child;
+
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00513)
+ "WARNING: MaxRequestWorkers of %d is not an integer "
+ "multiple of", max_workers);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " ThreadsPerChild of %d, decreasing to nearest "
+ "multiple %d,", threads_per_child,
+ tmp_max_workers);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " for a maximum of %d servers.",
+ ap_daemons_limit);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00514)
+ "MaxRequestWorkers of %d is not an integer multiple "
+ "of ThreadsPerChild of %d, decreasing to nearest "
+ "multiple %d", max_workers, threads_per_child,
+ tmp_max_workers);
+ }
+ max_workers = tmp_max_workers;
+ }
+
+ if (ap_daemons_limit > server_limit) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00515)
+ "WARNING: MaxRequestWorkers of %d would require %d "
+ "servers and ", max_workers, ap_daemons_limit);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " would exceed ServerLimit of %d, decreasing to %d.",
+ server_limit, server_limit * threads_per_child);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " To increase, please see the ServerLimit "
+ "directive.");
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00516)
+ "MaxRequestWorkers of %d would require %d servers and "
+ "exceed ServerLimit of %d, decreasing to %d",
+ max_workers, ap_daemons_limit, server_limit,
+ server_limit * threads_per_child);
+ }
+ ap_daemons_limit = server_limit;
+ }
+
+ /* ap_daemons_to_start > ap_daemons_limit checked in ap_mpm_run() */
+ if (ap_daemons_to_start < 0) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00517)
+ "WARNING: StartServers of %d not allowed, "
+ "increasing to 1.", ap_daemons_to_start);
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00518)
+ "StartServers of %d not allowed, increasing to 1",
+ ap_daemons_to_start);
+ }
+ ap_daemons_to_start = 1;
+ }
+
+ if (min_spare_threads < 1) {
+ if (startup) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL, APLOGNO(00519)
+ "WARNING: MinSpareThreads of %d not allowed, "
+ "increasing to 1", min_spare_threads);
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " to avoid almost certain server failure.");
+ ap_log_error(APLOG_MARK, APLOG_WARNING | APLOG_STARTUP, 0, NULL,
+ " Please read the documentation.");
+ } else {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, 0, s, APLOGNO(00520)
+ "MinSpareThreads of %d not allowed, increasing to 1",
+ min_spare_threads);
+ }
+ min_spare_threads = 1;
+ }
+
+ /* max_spare_threads < min_spare_threads + threads_per_child
+ * checked in ap_mpm_run()
+ */
+
+ return OK;
+}
+
+static void event_hooks(apr_pool_t * p)
+{
+ /* Our open_logs hook function must run before the core's, or stderr
+ * will be redirected to a file, and the messages won't print to the
+ * console.
+ */
+ static const char *const aszSucc[] = { "core.c", NULL };
+ one_process = 0;
+
+ ap_hook_open_logs(event_open_logs, NULL, aszSucc, APR_HOOK_REALLY_FIRST);
+ /* we need to set the MPM state before other pre-config hooks use MPM query
+ * to retrieve it, so register as REALLY_FIRST
+ */
+ ap_hook_pre_config(event_pre_config, NULL, NULL, APR_HOOK_REALLY_FIRST);
+ ap_hook_check_config(event_check_config, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_mpm(event_run, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_mpm_query(event_query, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_mpm_register_timed_callback(event_register_timed_callback, NULL, NULL,
+ APR_HOOK_MIDDLE);
+ ap_hook_mpm_get_name(event_get_name, NULL, NULL, APR_HOOK_MIDDLE);
+}
+
+static const char *set_daemons_to_start(cmd_parms *cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ ap_daemons_to_start = atoi(arg);
+ return NULL;
+}
+
+static const char *set_min_spare_threads(cmd_parms * cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ min_spare_threads = atoi(arg);
+ return NULL;
+}
+
+static const char *set_max_spare_threads(cmd_parms * cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ max_spare_threads = atoi(arg);
+ return NULL;
+}
+
+static const char *set_max_workers(cmd_parms * cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+ if (!strcasecmp(cmd->cmd->name, "MaxClients")) {
+ ap_log_error(APLOG_MARK, APLOG_INFO, 0, NULL, APLOGNO(00521)
+ "MaxClients is deprecated, use MaxRequestWorkers "
+ "instead.");
+ }
+ max_workers = atoi(arg);
+ return NULL;
+}
+
+static const char *set_threads_per_child(cmd_parms * cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ threads_per_child = atoi(arg);
+ return NULL;
+}
+static const char *set_server_limit (cmd_parms *cmd, void *dummy, const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ server_limit = atoi(arg);
+ return NULL;
+}
+
+static const char *set_thread_limit(cmd_parms * cmd, void *dummy,
+ const char *arg)
+{
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ thread_limit = atoi(arg);
+ return NULL;
+}
+
+static const char *set_worker_factor(cmd_parms * cmd, void *dummy,
+ const char *arg)
+{
+ double val;
+ char *endptr;
+ const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+ if (err != NULL) {
+ return err;
+ }
+
+ val = strtod(arg, &endptr);
+ if (*endptr)
+ return "error parsing value";
+
+ worker_factor = val * WORKER_FACTOR_SCALE;
+ if (worker_factor == 0)
+ worker_factor = 1;
+ return NULL;
+}
+
+
+static const command_rec event_cmds[] = {
+ LISTEN_COMMANDS,
+ AP_INIT_TAKE1("StartServers", set_daemons_to_start, NULL, RSRC_CONF,
+ "Number of child processes launched at server startup"),
+ AP_INIT_TAKE1("ServerLimit", set_server_limit, NULL, RSRC_CONF,
+ "Maximum number of child processes for this run of Apache"),
+ AP_INIT_TAKE1("MinSpareThreads", set_min_spare_threads, NULL, RSRC_CONF,
+ "Minimum number of idle threads, to handle request spikes"),
+ AP_INIT_TAKE1("MaxSpareThreads", set_max_spare_threads, NULL, RSRC_CONF,
+ "Maximum number of idle threads"),
+ AP_INIT_TAKE1("MaxClients", set_max_workers, NULL, RSRC_CONF,
+ "Deprecated name of MaxRequestWorkers"),
+ AP_INIT_TAKE1("MaxRequestWorkers", set_max_workers, NULL, RSRC_CONF,
+ "Maximum number of threads alive at the same time"),
+ AP_INIT_TAKE1("ThreadsPerChild", set_threads_per_child, NULL, RSRC_CONF,
+ "Number of threads each child creates"),
+ AP_INIT_TAKE1("ThreadLimit", set_thread_limit, NULL, RSRC_CONF,
+ "Maximum number of worker threads per child process for this "
+ "run of Apache - Upper limit for ThreadsPerChild"),
+ AP_INIT_TAKE1("AsyncRequestWorkerFactor", set_worker_factor, NULL, RSRC_CONF,
+ "How many additional connects will be accepted per idle "
+ "worker thread"),
+ AP_GRACEFUL_SHUTDOWN_TIMEOUT_COMMAND,
+ {NULL}
+};
+
+AP_DECLARE_MODULE(mpm_eventopt) = {
+ MPM20_MODULE_STUFF,
+ NULL, /* hook to run before apache parses args */
+ NULL, /* create per-directory config structure */
+ NULL, /* merge per-directory config structures */
+ NULL, /* create per-server config structure */
+ NULL, /* merge per-server config structures */
+ event_cmds, /* command apr_table_t */
+ event_hooks /* register_hooks */
+};
diff --git a/server/mpm/eventopt/fdqueue.c b/server/mpm/eventopt/fdqueue.c
new file mode 100644
index 0000000000..028bca106e
--- /dev/null
+++ b/server/mpm/eventopt/fdqueue.c
@@ -0,0 +1,507 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "fdqueue.h"
+#include "apr_atomic.h"
+
+typedef struct recycled_pool
+{
+ apr_pool_t *pool;
+ struct recycled_pool *next;
+} recycled_pool;
+
+struct fd_queue_info_t
+{
+ apr_int32_t idlers; /**
+ * 0 or positive: number of idle worker threads
+ * negative: number of threads blocked waiting
+ * for an idle worker
+ */
+ apr_thread_mutex_t *idlers_mutex;
+ apr_thread_cond_t *wait_for_idler;
+ int terminated;
+ int max_idlers;
+ int max_recycled_pools;
+ apr_uint32_t recycled_pools_count;
+ recycled_pool *recycled_pools;
+};
+
+static apr_status_t queue_info_cleanup(void *data_)
+{
+ fd_queue_info_t *qi = data_;
+ apr_thread_cond_destroy(qi->wait_for_idler);
+ apr_thread_mutex_destroy(qi->idlers_mutex);
+
+ /* Clean up any pools in the recycled list */
+ for (;;) {
+ struct recycled_pool *first_pool = qi->recycled_pools;
+ if (first_pool == NULL) {
+ break;
+ }
+ if (apr_atomic_casptr
+ ((void*) &(qi->recycled_pools), first_pool->next,
+ first_pool) == first_pool) {
+ apr_pool_destroy(first_pool->pool);
+ }
+ }
+
+ return APR_SUCCESS;
+}
+
+apr_status_t ap_queue_info_create(fd_queue_info_t ** queue_info,
+ apr_pool_t * pool, int max_idlers,
+ int max_recycled_pools)
+{
+ apr_status_t rv;
+ fd_queue_info_t *qi;
+
+ qi = apr_pcalloc(pool, sizeof(*qi));
+
+ rv = apr_thread_mutex_create(&qi->idlers_mutex, APR_THREAD_MUTEX_DEFAULT,
+ pool);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ rv = apr_thread_cond_create(&qi->wait_for_idler, pool);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ qi->recycled_pools = NULL;
+ qi->max_recycled_pools = max_recycled_pools;
+ qi->max_idlers = max_idlers;
+ apr_pool_cleanup_register(pool, qi, queue_info_cleanup,
+ apr_pool_cleanup_null);
+
+ *queue_info = qi;
+
+ return APR_SUCCESS;
+}
+
+apr_status_t ap_queue_info_set_idle(fd_queue_info_t * queue_info,
+ apr_pool_t * pool_to_recycle)
+{
+ apr_status_t rv;
+ int prev_idlers;
+
+ ap_push_pool(queue_info, pool_to_recycle);
+
+ /* Atomically increment the count of idle workers */
+ /*
+ * TODO: The atomics expect unsigned whereas we're using signed.
+ * Need to double check that they work as expected or else
+ * rework how we determine blocked.
+ */
+ prev_idlers = apr_atomic_inc32((apr_uint32_t *)&(queue_info->idlers));
+
+ /* If other threads are waiting on a worker, wake one up */
+ if (prev_idlers < 0) {
+ rv = apr_thread_mutex_lock(queue_info->idlers_mutex);
+ if (rv != APR_SUCCESS) {
+ AP_DEBUG_ASSERT(0);
+ return rv;
+ }
+ rv = apr_thread_cond_signal(queue_info->wait_for_idler);
+ if (rv != APR_SUCCESS) {
+ apr_thread_mutex_unlock(queue_info->idlers_mutex);
+ return rv;
+ }
+ rv = apr_thread_mutex_unlock(queue_info->idlers_mutex);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ }
+
+ return APR_SUCCESS;
+}
+
+apr_status_t ap_queue_info_try_get_idler(fd_queue_info_t * queue_info)
+{
+ int prev_idlers;
+ prev_idlers = apr_atomic_dec32((apr_uint32_t *)&(queue_info->idlers));
+ if (prev_idlers <= 0) {
+ apr_atomic_inc32((apr_uint32_t *)&(queue_info->idlers)); /* back out dec */
+ return APR_EAGAIN;
+ }
+ return APR_SUCCESS;
+}
+
+apr_status_t ap_queue_info_wait_for_idler(fd_queue_info_t * queue_info,
+ int *had_to_block)
+{
+ apr_status_t rv;
+ int prev_idlers;
+
+ /* Atomically decrement the idle worker count, saving the old value */
+ /* See TODO in ap_queue_info_set_idle() */
+ prev_idlers = apr_atomic_add32((apr_uint32_t *)&(queue_info->idlers), -1);
+
+ /* Block if there weren't any idle workers */
+ if (prev_idlers <= 0) {
+ rv = apr_thread_mutex_lock(queue_info->idlers_mutex);
+ if (rv != APR_SUCCESS) {
+ AP_DEBUG_ASSERT(0);
+ /* See TODO in ap_queue_info_set_idle() */
+ apr_atomic_inc32((apr_uint32_t *)&(queue_info->idlers)); /* back out dec */
+ return rv;
+ }
+ /* Re-check the idle worker count to guard against a
+ * race condition. Now that we're in the mutex-protected
+ * region, one of two things may have happened:
+ * - If the idle worker count is still negative, the
+ * workers are all still busy, so it's safe to
+ * block on a condition variable.
+ * - If the idle worker count is non-negative, then a
+ * worker has become idle since the first check
+ * of queue_info->idlers above. It's possible
+ * that the worker has also signaled the condition
+ * variable--and if so, the listener missed it
+ * because it wasn't yet blocked on the condition
+ * variable. But if the idle worker count is
+ * now non-negative, it's safe for this function to
+ * return immediately.
+ *
+ * A negative value in queue_info->idlers tells how many
+ * threads are waiting on an idle worker.
+ */
+ if (queue_info->idlers < 0) {
+ *had_to_block = 1;
+ rv = apr_thread_cond_wait(queue_info->wait_for_idler,
+ queue_info->idlers_mutex);
+ if (rv != APR_SUCCESS) {
+ apr_status_t rv2;
+ AP_DEBUG_ASSERT(0);
+ rv2 = apr_thread_mutex_unlock(queue_info->idlers_mutex);
+ if (rv2 != APR_SUCCESS) {
+ return rv2;
+ }
+ return rv;
+ }
+ }
+ rv = apr_thread_mutex_unlock(queue_info->idlers_mutex);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ }
+
+ if (queue_info->terminated) {
+ return APR_EOF;
+ }
+ else {
+ return APR_SUCCESS;
+ }
+}
+
+apr_uint32_t ap_queue_info_get_idlers(fd_queue_info_t * queue_info)
+{
+ apr_int32_t val;
+ val = (apr_int32_t)apr_atomic_read32((apr_uint32_t *)&queue_info->idlers);
+ if (val < 0)
+ return 0;
+ return val;
+}
+
+void ap_push_pool(fd_queue_info_t * queue_info,
+ apr_pool_t * pool_to_recycle)
+{
+ struct recycled_pool *new_recycle;
+ /* If we have been given a pool to recycle, atomically link
+ * it into the queue_info's list of recycled pools
+ */
+ if (!pool_to_recycle)
+ return;
+
+ if (queue_info->max_recycled_pools >= 0) {
+ apr_uint32_t cnt = apr_atomic_read32(&queue_info->recycled_pools_count);
+ if (cnt >= queue_info->max_recycled_pools) {
+ apr_pool_destroy(pool_to_recycle);
+ return;
+ }
+ apr_atomic_inc32(&queue_info->recycled_pools_count);
+ }
+
+ new_recycle = (struct recycled_pool *) apr_palloc(pool_to_recycle,
+ sizeof (*new_recycle));
+ new_recycle->pool = pool_to_recycle;
+ for (;;) {
+ /*
+ * Save queue_info->recycled_pool in local variable next because
+ * new_recycle->next can be changed after apr_atomic_casptr
+ * function call. For gory details see PR 44402.
+ */
+ struct recycled_pool *next = queue_info->recycled_pools;
+ new_recycle->next = next;
+ if (apr_atomic_casptr((void*) &(queue_info->recycled_pools),
+ new_recycle, next) == next)
+ break;
+ }
+}
+
+void ap_pop_pool(apr_pool_t ** recycled_pool, fd_queue_info_t * queue_info)
+{
+ /* Atomically pop a pool from the recycled list */
+
+ /* This function is safe only as long as it is single threaded because
+ * it reaches into the queue and accesses "next" which can change.
+ * We are OK today because it is only called from the listener thread.
+ * cas-based pushes do not have the same limitation - any number can
+ * happen concurrently with a single cas-based pop.
+ */
+
+ *recycled_pool = NULL;
+
+
+ /* Atomically pop a pool from the recycled list */
+ for (;;) {
+ struct recycled_pool *first_pool = queue_info->recycled_pools;
+ if (first_pool == NULL) {
+ break;
+ }
+ if (apr_atomic_casptr
+ ((void*) &(queue_info->recycled_pools),
+ first_pool->next, first_pool) == first_pool) {
+ *recycled_pool = first_pool->pool;
+ if (queue_info->max_recycled_pools >= 0)
+ apr_atomic_dec32(&queue_info->recycled_pools_count);
+ break;
+ }
+ }
+}
+
+apr_status_t ap_queue_info_term(fd_queue_info_t * queue_info)
+{
+ apr_status_t rv;
+ rv = apr_thread_mutex_lock(queue_info->idlers_mutex);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ queue_info->terminated = 1;
+ apr_thread_cond_broadcast(queue_info->wait_for_idler);
+ return apr_thread_mutex_unlock(queue_info->idlers_mutex);
+}
+
+/**
+ * Detects when the fd_queue_t is full. This utility function is expected
+ * to be called from within critical sections, and is not threadsafe.
+ */
+#define ap_queue_full(queue) ((queue)->nelts == (queue)->bounds)
+
+/**
+ * Detects when the fd_queue_t is empty. This utility function is expected
+ * to be called from within critical sections, and is not threadsafe.
+ */
+#define ap_queue_empty(queue) ((queue)->nelts == 0 && APR_RING_EMPTY(&queue->timers ,timer_event_t, link))
+
+/**
+ * Callback routine that is called to destroy this
+ * fd_queue_t when its pool is destroyed.
+ */
+static apr_status_t ap_queue_destroy(void *data)
+{
+ fd_queue_t *queue = data;
+
+ /* Ignore errors here, we can't do anything about them anyway.
+ * XXX: We should at least try to signal an error here, it is
+ * indicative of a programmer error. -aaron */
+ apr_thread_cond_destroy(queue->not_empty);
+ apr_thread_mutex_destroy(queue->one_big_mutex);
+
+ return APR_SUCCESS;
+}
+
+/**
+ * Initialize the fd_queue_t.
+ */
+apr_status_t ap_queue_init(fd_queue_t * queue, int queue_capacity,
+ apr_pool_t * a)
+{
+ int i;
+ apr_status_t rv;
+
+ if ((rv = apr_thread_mutex_create(&queue->one_big_mutex,
+ APR_THREAD_MUTEX_DEFAULT,
+ a)) != APR_SUCCESS) {
+ return rv;
+ }
+ if ((rv = apr_thread_cond_create(&queue->not_empty, a)) != APR_SUCCESS) {
+ return rv;
+ }
+
+ APR_RING_INIT(&queue->timers, timer_event_t, link);
+
+ queue->data = apr_palloc(a, queue_capacity * sizeof(fd_queue_elem_t));
+ queue->bounds = queue_capacity;
+ queue->nelts = 0;
+ queue->in = 0;
+ queue->out = 0;
+
+ /* Set all the sockets in the queue to NULL */
+ for (i = 0; i < queue_capacity; ++i)
+ queue->data[i].sd = NULL;
+
+ apr_pool_cleanup_register(a, queue, ap_queue_destroy,
+ apr_pool_cleanup_null);
+
+ return APR_SUCCESS;
+}
+
+/**
+ * Push a new socket onto the queue.
+ *
+ * precondition: ap_queue_info_wait_for_idler has already been called
+ * to reserve an idle worker thread
+ */
+apr_status_t ap_queue_push(fd_queue_t * queue, apr_socket_t * sd,
+ event_conn_state_t * ecs, apr_pool_t * p)
+{
+ fd_queue_elem_t *elem;
+ apr_status_t rv;
+
+ if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+
+ AP_DEBUG_ASSERT(!queue->terminated);
+ AP_DEBUG_ASSERT(!ap_queue_full(queue));
+
+ elem = &queue->data[queue->in];
+ queue->in++;
+ if (queue->in >= queue->bounds)
+ queue->in -= queue->bounds;
+ elem->sd = sd;
+ elem->ecs = ecs;
+ elem->p = p;
+ queue->nelts++;
+
+ apr_thread_cond_signal(queue->not_empty);
+
+ if ((rv = apr_thread_mutex_unlock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+
+ return APR_SUCCESS;
+}
+
+apr_status_t ap_queue_push_timer(fd_queue_t * queue, timer_event_t *te)
+{
+ apr_status_t rv;
+
+ if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+
+ AP_DEBUG_ASSERT(!queue->terminated);
+
+ APR_RING_INSERT_TAIL(&queue->timers, te, timer_event_t, link);
+
+ apr_thread_cond_signal(queue->not_empty);
+
+ if ((rv = apr_thread_mutex_unlock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+
+ return APR_SUCCESS;
+}
+
+/**
+ * Retrieves the next available socket from the queue. If there are no
+ * sockets available, it will block until one becomes available.
+ * Once retrieved, the socket is placed into the address specified by
+ * 'sd'.
+ */
+apr_status_t ap_queue_pop_something(fd_queue_t * queue, apr_socket_t ** sd,
+ event_conn_state_t ** ecs, apr_pool_t ** p,
+ timer_event_t ** te_out)
+{
+ fd_queue_elem_t *elem;
+ apr_status_t rv;
+
+ if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+
+ /* Keep waiting until we wake up and find that the queue is not empty. */
+ if (ap_queue_empty(queue)) {
+ if (!queue->terminated) {
+ apr_thread_cond_wait(queue->not_empty, queue->one_big_mutex);
+ }
+ /* If we wake up and it's still empty, then we were interrupted */
+ if (ap_queue_empty(queue)) {
+ rv = apr_thread_mutex_unlock(queue->one_big_mutex);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ if (queue->terminated) {
+ return APR_EOF; /* no more elements ever again */
+ }
+ else {
+ return APR_EINTR;
+ }
+ }
+ }
+
+ *te_out = NULL;
+
+ if (!APR_RING_EMPTY(&queue->timers, timer_event_t, link)) {
+ *te_out = APR_RING_FIRST(&queue->timers);
+ APR_RING_REMOVE(*te_out, link);
+ }
+ else {
+ elem = &queue->data[queue->out];
+ queue->out++;
+ if (queue->out >= queue->bounds)
+ queue->out -= queue->bounds;
+ queue->nelts--;
+ *sd = elem->sd;
+ *ecs = elem->ecs;
+ *p = elem->p;
+#ifdef AP_DEBUG
+ elem->sd = NULL;
+ elem->p = NULL;
+#endif /* AP_DEBUG */
+ }
+
+ rv = apr_thread_mutex_unlock(queue->one_big_mutex);
+ return rv;
+}
+
+apr_status_t ap_queue_interrupt_all(fd_queue_t * queue)
+{
+ apr_status_t rv;
+
+ if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+ apr_thread_cond_broadcast(queue->not_empty);
+ return apr_thread_mutex_unlock(queue->one_big_mutex);
+}
+
+apr_status_t ap_queue_term(fd_queue_t * queue)
+{
+ apr_status_t rv;
+
+ if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+ /* we must hold one_big_mutex when setting this... otherwise,
+ * we could end up setting it and waking everybody up just after a
+ * would-be popper checks it but right before they block
+ */
+ queue->terminated = 1;
+ if ((rv = apr_thread_mutex_unlock(queue->one_big_mutex)) != APR_SUCCESS) {
+ return rv;
+ }
+ return ap_queue_interrupt_all(queue);
+}
diff --git a/server/mpm/eventopt/fdqueue.h b/server/mpm/eventopt/fdqueue.h
new file mode 100644
index 0000000000..b867b653f9
--- /dev/null
+++ b/server/mpm/eventopt/fdqueue.h
@@ -0,0 +1,104 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file event/fdqueue.h
+ * @brief fd queue declarations
+ *
+ * @addtogroup APACHE_MPM_EVENTOPT
+ * @{
+ */
+
+#ifndef FDQUEUE_H
+#define FDQUEUE_H
+#include "httpd.h"
+#include <stdlib.h>
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+#include <apr_thread_mutex.h>
+#include <apr_thread_cond.h>
+#include <sys/types.h>
+#if APR_HAVE_SYS_SOCKET_H
+#include <sys/socket.h>
+#endif
+#include <apr_errno.h>
+
+#include "ap_mpm.h"
+
+typedef struct fd_queue_info_t fd_queue_info_t;
+typedef struct event_conn_state_t event_conn_state_t;
+
+apr_status_t ap_queue_info_create(fd_queue_info_t ** queue_info,
+ apr_pool_t * pool, int max_idlers,
+ int max_recycled_pools);
+apr_status_t ap_queue_info_set_idle(fd_queue_info_t * queue_info,
+ apr_pool_t * pool_to_recycle);
+apr_status_t ap_queue_info_try_get_idler(fd_queue_info_t * queue_info);
+apr_status_t ap_queue_info_wait_for_idler(fd_queue_info_t * queue_info,
+ int *had_to_block);
+apr_status_t ap_queue_info_term(fd_queue_info_t * queue_info);
+apr_uint32_t ap_queue_info_get_idlers(fd_queue_info_t * queue_info);
+
+struct fd_queue_elem_t
+{
+ apr_socket_t *sd;
+ apr_pool_t *p;
+ event_conn_state_t *ecs;
+};
+typedef struct fd_queue_elem_t fd_queue_elem_t;
+
+typedef struct timer_event_t timer_event_t;
+
+struct timer_event_t {
+ APR_RING_ENTRY(timer_event_t) link;
+ apr_time_t when;
+ ap_mpm_callback_fn_t *cbfunc;
+ void *baton;
+};
+
+
+struct fd_queue_t
+{
+ APR_RING_HEAD(timers_t, timer_event_t) timers;
+ fd_queue_elem_t *data;
+ unsigned int nelts;
+ unsigned int bounds;
+ unsigned int in;
+ unsigned int out;
+ apr_thread_mutex_t *one_big_mutex;
+ apr_thread_cond_t *not_empty;
+ int terminated;
+};
+typedef struct fd_queue_t fd_queue_t;
+
+void ap_pop_pool(apr_pool_t ** recycled_pool, fd_queue_info_t * queue_info);
+void ap_push_pool(fd_queue_info_t * queue_info,
+ apr_pool_t * pool_to_recycle);
+
+apr_status_t ap_queue_init(fd_queue_t * queue, int queue_capacity,
+ apr_pool_t * a);
+apr_status_t ap_queue_push(fd_queue_t * queue, apr_socket_t * sd,
+ event_conn_state_t * ecs, apr_pool_t * p);
+apr_status_t ap_queue_push_timer(fd_queue_t *queue, timer_event_t *te);
+apr_status_t ap_queue_pop_something(fd_queue_t * queue, apr_socket_t ** sd,
+ event_conn_state_t ** ecs, apr_pool_t ** p,
+ timer_event_t ** te);
+apr_status_t ap_queue_interrupt_all(fd_queue_t * queue);
+apr_status_t ap_queue_term(fd_queue_t * queue);
+
+#endif /* FDQUEUE_H */
+/** @} */
diff --git a/server/mpm/eventopt/mpm_default.h b/server/mpm/eventopt/mpm_default.h
new file mode 100644
index 0000000000..64c6db2478
--- /dev/null
+++ b/server/mpm/eventopt/mpm_default.h
@@ -0,0 +1,56 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+/**
+ * @file event/mpm_default.h
+ * @brief Event MPM defaults
+ *
+ * @defgroup APACHE_MPM_EVENTOPT EventOpt MPM
+ * @ingroup APACHE_INTERNAL
+ * @{
+ */
+
+#ifndef APACHE_MPM_DEFAULT_H
+#define APACHE_MPM_DEFAULT_H
+
+/* Number of servers to spawn off by default --- also, if fewer than
+ * this free when the caretaker checks, it will spawn more.
+ */
+#ifndef DEFAULT_START_DAEMON
+#define DEFAULT_START_DAEMON 3
+#endif
+
+/* Maximum number of *free* server processes --- more than this, and
+ * they will die off.
+ */
+
+#ifndef DEFAULT_MAX_FREE_DAEMON
+#define DEFAULT_MAX_FREE_DAEMON 10
+#endif
+
+/* Minimum --- fewer than this, and more will be created */
+
+#ifndef DEFAULT_MIN_FREE_DAEMON
+#define DEFAULT_MIN_FREE_DAEMON 3
+#endif
+
+#ifndef DEFAULT_THREADS_PER_CHILD
+#define DEFAULT_THREADS_PER_CHILD 25
+#endif
+
+#endif /* AP_MPM_DEFAULT_H */
+/** @} */
diff --git a/server/mpm/eventopt/pod.c b/server/mpm/eventopt/pod.c
new file mode 100644
index 0000000000..bf6788b09e
--- /dev/null
+++ b/server/mpm/eventopt/pod.c
@@ -0,0 +1,113 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "pod.h"
+
+#include "apr_portable.h"
+
+#if APR_HAVE_UNISTD_H
+#include <unistd.h>
+#endif
+
+APLOG_USE_MODULE(mpm_eventopt);
+
+AP_DECLARE(apr_status_t) ap_eventopt_pod_open(apr_pool_t * p, ap_eventopt_pod_t ** pod)
+{
+ apr_status_t rv;
+
+ *pod = apr_palloc(p, sizeof(**pod));
+ rv = apr_file_pipe_create(&((*pod)->pod_in), &((*pod)->pod_out), p);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+/*
+ apr_file_pipe_timeout_set((*pod)->pod_in, 0);
+*/
+ (*pod)->p = p;
+
+ /* close these before exec. */
+ apr_file_inherit_unset((*pod)->pod_in);
+ apr_file_inherit_unset((*pod)->pod_out);
+
+ return APR_SUCCESS;
+}
+
+AP_DECLARE(int) ap_eventopt_pod_check(ap_eventopt_pod_t * pod)
+{
+ char c;
+ apr_os_file_t fd;
+ int rc;
+
+ /* we need to surface EINTR so we'll have to grab the
+ * native file descriptor and do the OS read() ourselves
+ */
+ apr_os_file_get(&fd, pod->pod_in);
+ rc = read(fd, &c, 1);
+ if (rc == 1) {
+ switch (c) {
+ case RESTART_CHAR:
+ return AP_RESTART;
+ case GRACEFUL_CHAR:
+ return AP_GRACEFUL;
+ }
+ }
+ return AP_NORESTART;
+}
+
+AP_DECLARE(apr_status_t) ap_eventopt_pod_close(ap_eventopt_pod_t * pod)
+{
+ apr_status_t rv;
+
+ rv = apr_file_close(pod->pod_out);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+
+ rv = apr_file_close(pod->pod_in);
+ if (rv != APR_SUCCESS) {
+ return rv;
+ }
+ return rv;
+}
+
+static apr_status_t pod_signal_internal(ap_eventopt_pod_t * pod, int graceful)
+{
+ apr_status_t rv;
+ char char_of_death = graceful ? GRACEFUL_CHAR : RESTART_CHAR;
+ apr_size_t one = 1;
+
+ rv = apr_file_write(pod->pod_out, &char_of_death, &one);
+ if (rv != APR_SUCCESS) {
+ ap_log_error(APLOG_MARK, APLOG_WARNING, rv, ap_server_conf, APLOGNO(00522)
+ "write pipe_of_death");
+ }
+ return rv;
+}
+
+AP_DECLARE(apr_status_t) ap_eventopt_pod_signal(ap_eventopt_pod_t * pod, int graceful)
+{
+ return pod_signal_internal(pod, graceful);
+}
+
+AP_DECLARE(void) ap_eventopt_pod_killpg(ap_eventopt_pod_t * pod, int num, int graceful)
+{
+ int i;
+ apr_status_t rv = APR_SUCCESS;
+
+ for (i = 0; i < num && rv == APR_SUCCESS; i++) {
+ rv = pod_signal_internal(pod, graceful);
+ }
+}
diff --git a/server/mpm/eventopt/pod.h b/server/mpm/eventopt/pod.h
new file mode 100644
index 0000000000..b3e254d402
--- /dev/null
+++ b/server/mpm/eventopt/pod.h
@@ -0,0 +1,59 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file event/pod.h
+ * @brief pod definitions
+ *
+ * @addtogroup APACHE_MPM_EVENTOPT
+ * @{
+ */
+
+#include "apr.h"
+#include "apr_strings.h"
+#define APR_WANT_STRFUNC
+#include "apr_want.h"
+
+#include "httpd.h"
+#include "http_config.h"
+#include "http_log.h"
+#include "http_main.h"
+#include "mpm_common.h"
+#include "ap_mpm.h"
+#include "ap_listen.h"
+#include "mpm_default.h"
+
+#define RESTART_CHAR '$'
+#define GRACEFUL_CHAR '!'
+
+#define AP_RESTART 0
+#define AP_GRACEFUL 1
+
+typedef struct ap_eventopt_pod_t ap_eventopt_pod_t;
+
+struct ap_eventopt_pod_t
+{
+ apr_file_t *pod_in;
+ apr_file_t *pod_out;
+ apr_pool_t *p;
+};
+
+AP_DECLARE(apr_status_t) ap_eventopt_pod_open(apr_pool_t * p, ap_eventopt_pod_t ** pod);
+AP_DECLARE(int) ap_eventopt_pod_check(ap_eventopt_pod_t * pod);
+AP_DECLARE(apr_status_t) ap_eventopt_pod_close(ap_eventopt_pod_t * pod);
+AP_DECLARE(apr_status_t) ap_eventopt_pod_signal(ap_eventopt_pod_t * pod, int graceful);
+AP_DECLARE(void) ap_eventopt_pod_killpg(ap_eventopt_pod_t * pod, int num, int graceful);
+/** @} */
generated by cgit v1.2.3 (git 2.39.1) at 2025-02-01 16:04:32 +0100