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/* Thread management routine header.
* Copyright (C) 1998 Kunihiro Ishiguro
*
* This file is part of GNU Zebra.
*
* GNU Zebra is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* GNU Zebra is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; see the file COPYING; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef _ZEBRA_THREAD_H
#define _ZEBRA_THREAD_H
#include <zebra.h>
#include <pthread.h>
#include <poll.h>
#include "monotime.h"
#include "frratomic.h"
#include "typesafe.h"
#include "xref.h"
#ifdef __cplusplus
extern "C" {
#endif
extern bool cputime_enabled;
extern unsigned long cputime_threshold;
/* capturing wallclock time is always enabled since it is fast (reading
* hardware TSC w/o syscalls)
*/
extern unsigned long walltime_threshold;
struct rusage_t {
#ifdef HAVE_CLOCK_THREAD_CPUTIME_ID
struct timespec cpu;
#else
struct rusage cpu;
#endif
struct timeval real;
};
#define RUSAGE_T struct rusage_t
#define GETRUSAGE(X) thread_getrusage(X)
PREDECL_LIST(thread_list);
PREDECL_HEAP(thread_timer_list);
struct fd_handler {
/* number of pfd that fit in the allocated space of pfds. This is a
* constant and is the same for both pfds and copy.
*/
nfds_t pfdsize;
/* file descriptors to monitor for i/o */
struct pollfd *pfds;
/* number of pollfds stored in pfds */
nfds_t pfdcount;
/* chunk used for temp copy of pollfds */
struct pollfd *copy;
/* number of pollfds stored in copy */
nfds_t copycount;
};
struct xref_threadsched {
struct xref xref;
const char *funcname;
const char *dest;
uint32_t thread_type;
};
/* Master of the theads. */
struct thread_master {
char *name;
struct thread **read;
struct thread **write;
struct thread_timer_list_head timer;
struct thread_list_head event, ready, unuse;
struct list *cancel_req;
bool canceled;
pthread_cond_t cancel_cond;
struct hash *cpu_record;
int io_pipe[2];
int fd_limit;
struct fd_handler handler;
unsigned long alloc;
long selectpoll_timeout;
bool spin;
bool handle_signals;
pthread_mutex_t mtx;
pthread_t owner;
bool ready_run_loop;
RUSAGE_T last_getrusage;
};
/* Thread itself. */
struct thread {
uint8_t type; /* thread type */
uint8_t add_type; /* thread type */
struct thread_list_item threaditem;
struct thread_timer_list_item timeritem;
struct thread **ref; /* external reference (if given) */
struct thread_master *master; /* pointer to the struct thread_master */
void (*func)(struct thread *); /* event function */
void *arg; /* event argument */
union {
int val; /* second argument of the event. */
int fd; /* file descriptor in case of r/w */
struct timeval sands; /* rest of time sands value. */
} u;
struct timeval real;
struct cpu_thread_history *hist; /* cache pointer to cpu_history */
unsigned long yield; /* yield time in microseconds */
const struct xref_threadsched *xref; /* origin location */
pthread_mutex_t mtx; /* mutex for thread.c functions */
bool ignore_timer_late;
};
#ifdef _FRR_ATTRIBUTE_PRINTFRR
#pragma FRR printfrr_ext "%pTH" (struct thread *)
#endif
struct cpu_thread_history {
void (*func)(struct thread *);
atomic_size_t total_cpu_warn;
atomic_size_t total_wall_warn;
atomic_size_t total_starv_warn;
atomic_size_t total_calls;
atomic_size_t total_active;
struct time_stats {
atomic_size_t total, max;
} real;
struct time_stats cpu;
atomic_uint_fast32_t types;
const char *funcname;
};
/* Struct timeval's tv_usec one second value. */
#define TIMER_SECOND_MICRO 1000000L
/* Thread types. */
#define THREAD_READ 0
#define THREAD_WRITE 1
#define THREAD_TIMER 2
#define THREAD_EVENT 3
#define THREAD_READY 4
#define THREAD_UNUSED 5
#define THREAD_EXECUTE 6
/* Thread yield time. */
#define THREAD_YIELD_TIME_SLOT 10 * 1000L /* 10ms */
#define THREAD_TIMER_STRLEN 12
/* Macros. */
#define THREAD_ARG(X) ((X)->arg)
#define THREAD_FD(X) ((X)->u.fd)
#define THREAD_VAL(X) ((X)->u.val)
/*
* Please consider this macro deprecated, and do not use it in new code.
*/
#define THREAD_OFF(thread) \
do { \
if ((thread)) \
thread_cancel(&(thread)); \
} while (0)
/*
* Macro wrappers to generate xrefs for all thread add calls. Includes
* file/line/function info for debugging/tracing.
*/
#include "lib/xref.h"
#define _xref_t_a(addfn, type, m, f, a, v, t) \
({ \
static const struct xref_threadsched _xref \
__attribute__((used)) = { \
.xref = XREF_INIT(XREFT_THREADSCHED, NULL, __func__), \
.funcname = #f, \
.dest = #t, \
.thread_type = THREAD_ ## type, \
}; \
XREF_LINK(_xref.xref); \
_thread_add_ ## addfn(&_xref, m, f, a, v, t); \
}) \
/* end */
#define thread_add_read(m,f,a,v,t) _xref_t_a(read_write, READ, m,f,a,v,t)
#define thread_add_write(m,f,a,v,t) _xref_t_a(read_write, WRITE, m,f,a,v,t)
#define thread_add_timer(m,f,a,v,t) _xref_t_a(timer, TIMER, m,f,a,v,t)
#define thread_add_timer_msec(m,f,a,v,t) _xref_t_a(timer_msec, TIMER, m,f,a,v,t)
#define thread_add_timer_tv(m,f,a,v,t) _xref_t_a(timer_tv, TIMER, m,f,a,v,t)
#define thread_add_event(m,f,a,v,t) _xref_t_a(event, EVENT, m,f,a,v,t)
#define thread_execute(m,f,a,v) \
({ \
static const struct xref_threadsched _xref \
__attribute__((used)) = { \
.xref = XREF_INIT(XREFT_THREADSCHED, NULL, __func__), \
.funcname = #f, \
.dest = NULL, \
.thread_type = THREAD_EXECUTE, \
}; \
XREF_LINK(_xref.xref); \
_thread_execute(&_xref, m, f, a, v); \
}) /* end */
/* Prototypes. */
extern struct thread_master *thread_master_create(const char *);
void thread_master_set_name(struct thread_master *master, const char *name);
extern void thread_master_free(struct thread_master *);
extern void thread_master_free_unused(struct thread_master *);
extern void _thread_add_read_write(const struct xref_threadsched *xref,
struct thread_master *master,
void (*fn)(struct thread *), void *arg,
int fd, struct thread **tref);
extern void _thread_add_timer(const struct xref_threadsched *xref,
struct thread_master *master,
void (*fn)(struct thread *), void *arg, long t,
struct thread **tref);
extern void _thread_add_timer_msec(const struct xref_threadsched *xref,
struct thread_master *master,
void (*fn)(struct thread *), void *arg,
long t, struct thread **tref);
extern void _thread_add_timer_tv(const struct xref_threadsched *xref,
struct thread_master *master,
void (*fn)(struct thread *), void *arg,
struct timeval *tv, struct thread **tref);
extern void _thread_add_event(const struct xref_threadsched *xref,
struct thread_master *master,
void (*fn)(struct thread *), void *arg, int val,
struct thread **tref);
extern void _thread_execute(const struct xref_threadsched *xref,
struct thread_master *master,
void (*fn)(struct thread *), void *arg, int val);
extern void thread_cancel(struct thread **event);
extern void thread_cancel_async(struct thread_master *, struct thread **,
void *);
/* Cancel ready tasks with an arg matching 'arg' */
extern void thread_cancel_event_ready(struct thread_master *m, void *arg);
/* Cancel all tasks with an arg matching 'arg', including timers and io */
extern void thread_cancel_event(struct thread_master *m, void *arg);
extern struct thread *thread_fetch(struct thread_master *, struct thread *);
extern void thread_call(struct thread *);
extern unsigned long thread_timer_remain_second(struct thread *);
extern struct timeval thread_timer_remain(struct thread *);
extern unsigned long thread_timer_remain_msec(struct thread *);
extern int thread_should_yield(struct thread *);
/* set yield time for thread */
extern void thread_set_yield_time(struct thread *, unsigned long);
/* Internal libfrr exports */
extern void thread_getrusage(RUSAGE_T *);
extern void thread_cmd_init(void);
/* Returns elapsed real (wall clock) time. */
extern unsigned long thread_consumed_time(RUSAGE_T *after, RUSAGE_T *before,
unsigned long *cpu_time_elapsed);
/* only for use in logging functions! */
extern pthread_key_t thread_current;
extern char *thread_timer_to_hhmmss(char *buf, int buf_size,
struct thread *t_timer);
static inline bool thread_is_scheduled(struct thread *thread)
{
if (thread)
return true;
return false;
}
/* Debug signal mask */
void debug_signals(const sigset_t *sigs);
static inline void thread_ignore_late_timer(struct thread *thread)
{
thread->ignore_timer_late = true;
}
#ifdef __cplusplus
}
#endif
#endif /* _ZEBRA_THREAD_H */
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