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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* Portions of this software are based upon public domain software
* originally written at the National Center for Supercomputing Applications,
* University of Illinois, Urbana-Champaign.
*/
/* The purpose of this file is to store the code that MOST mpm's will need
* this does not mean a function only goes into this file if every MPM needs
* it. It means that if a function is needed by more than one MPM, and
* future maintenance would be served by making the code common, then the
* function belongs here.
*
* This is going in src/main because it is not platform specific, it is
* specific to multi-process servers, but NOT to Unix. Which is why it
* does not belong in src/os/unix
*/
#ifndef APACHE_MPM_COMMON_H
#define APACHE_MPM_COMMON_H
#ifdef __cplusplus
extern "C" {
#endif
/**
* @package Multi-Processing Modules functions
*/
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h> /* for TCP_NODELAY */
#endif
/**
* Make sure all child processes that have been spawned by the parent process
* have died. This includes process registered as "other_children".
* @warning This is only defined if the MPM defines
* MPM_NEEDS_RECLAIM_CHILD_PROCESS
* @param terminate Either 1 or 0. If 1, send the child processes SIGTERM
* each time through the loop. If 0, give the process time to die
* on its own before signalling it.
* @tip This function requires that some macros are defined by the MPM: <PRE>
* MPM_SYNC_CHILD_TABLE -- sync the scoreboard image between child and parent
* MPM_CHILD_PID -- Get the pid from the specified spot in the scoreboard
* MPM_NOTE_CHILD_KILLED -- Note the child died in the scoreboard
*/
void ap_reclaim_child_processes(int terminate);
/**
* Determine if any child process has died. If no child process died, then
* this process sleeps for the amount of time specified by the MPM defined
* macro SCOREBOARD_MAINTENANCE_INTERVAL.
* @param status The return code if a process has died
* @param ret The process id of the process that died
* @param p The pool to allocate out of
*/
void ap_wait_or_timeout(ap_wait_t *status, apr_proc_t *ret, apr_pool_t *p);
/**
* Log why a child died to the error log, if the child died without the
* parent signalling it.
* @param pid The child that has died
* @param status The status returned from ap_wait_or_timeout
*/
void ap_process_child_status(apr_proc_t *pid, ap_wait_t status);
#if defined(TCP_NODELAY) && !defined(MPE) && !defined(TPF)
/**
* Turn off the nagle algorithm for the specified socket. The nagle algorithm
* says that we should delay sending partial packets in the hopes of getting
* more data. There are bad interactions between persistent connections and
* Nagle's algorithm that have severe performance penalties.
* @param s The socket to disable nagle for.
*/
void ap_sock_disable_nagle(int s);
#else
#define ap_sock_disable_nagle(s) /* NOOP */
#endif
#define AP_MPM_HARD_LIMITS_FILE "src/" APACHE_MPM_DIR "/mpm_default.h"
#ifdef __cplusplus
}
#endif
#endif /* !APACHE_MPM_COMMON_H */
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