ASTERISK_REGISTER_FILE no longer has any purpose so this commit removes all traces of it. Previously exported symbols removed: * __ast_register_file * __ast_unregister_file * ast_complete_source_filename This also removes the mtx_prof static variable that was declared when MTX_PROFILE was enabled. This variable was only used in lock.c so it is now initialized in that file only. ASTERISK-26480 #close Change-Id: I1074af07d71f9e159c48ef36631aa432c86f9966
483 lines
10 KiB
C
483 lines
10 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 2008, Digium, Inc.
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*
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* Russell Bryant <russell@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*!
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* \file
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* \author Russell Bryant <russell@digium.com>
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*
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* \brief pthread timing interface
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*/
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/*** MODULEINFO
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<support_level>extended</support_level>
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***/
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#include "asterisk.h"
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#include <stdbool.h>
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#include <math.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include "asterisk/module.h"
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#include "asterisk/timing.h"
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#include "asterisk/utils.h"
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#include "asterisk/astobj2.h"
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#include "asterisk/time.h"
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#include "asterisk/lock.h"
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static void *timing_funcs_handle;
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static void *pthread_timer_open(void);
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static void pthread_timer_close(void *data);
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static int pthread_timer_set_rate(void *data, unsigned int rate);
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static int pthread_timer_ack(void *data, unsigned int quantity);
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static int pthread_timer_enable_continuous(void *data);
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static int pthread_timer_disable_continuous(void *data);
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static enum ast_timer_event pthread_timer_get_event(void *data);
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static unsigned int pthread_timer_get_max_rate(void *data);
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static int pthread_timer_fd(void *data);
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static struct ast_timing_interface pthread_timing = {
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.name = "pthread",
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.priority = 0, /* use this as a last resort */
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.timer_open = pthread_timer_open,
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.timer_close = pthread_timer_close,
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.timer_set_rate = pthread_timer_set_rate,
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.timer_ack = pthread_timer_ack,
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.timer_enable_continuous = pthread_timer_enable_continuous,
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.timer_disable_continuous = pthread_timer_disable_continuous,
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.timer_get_event = pthread_timer_get_event,
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.timer_get_max_rate = pthread_timer_get_max_rate,
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.timer_fd = pthread_timer_fd,
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};
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/* 1 tick / 10 ms */
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#define MAX_RATE 100
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static struct ao2_container *pthread_timers;
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#define PTHREAD_TIMER_BUCKETS 563
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enum {
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PIPE_READ = 0,
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PIPE_WRITE = 1
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};
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enum pthread_timer_state {
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TIMER_STATE_IDLE,
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TIMER_STATE_TICKING,
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};
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struct pthread_timer {
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int pipe[2];
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enum pthread_timer_state state;
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unsigned int rate;
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/*! Interval in ms for current rate */
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unsigned int interval;
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unsigned int tick_count;
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unsigned int pending_ticks;
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struct timeval start;
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bool continuous:1;
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bool pipe_signaled:1;
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};
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static void pthread_timer_destructor(void *obj);
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static void signal_pipe(struct pthread_timer *timer);
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static void unsignal_pipe(struct pthread_timer *timer);
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static void ack_ticks(struct pthread_timer *timer, unsigned int num);
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/*!
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* \brief Data for the timing thread
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*/
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static struct {
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pthread_t thread;
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ast_mutex_t lock;
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ast_cond_t cond;
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unsigned int stop:1;
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} timing_thread;
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static void *pthread_timer_open(void)
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{
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struct pthread_timer *timer;
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int i;
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if (!(timer = ao2_alloc(sizeof(*timer), pthread_timer_destructor))) {
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errno = ENOMEM;
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return NULL;
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}
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timer->pipe[PIPE_READ] = timer->pipe[PIPE_WRITE] = -1;
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timer->state = TIMER_STATE_IDLE;
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if (pipe(timer->pipe)) {
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ao2_ref(timer, -1);
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return NULL;
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}
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for (i = 0; i < ARRAY_LEN(timer->pipe); ++i) {
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int flags = fcntl(timer->pipe[i], F_GETFL);
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flags |= O_NONBLOCK;
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fcntl(timer->pipe[i], F_SETFL, flags);
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}
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ao2_lock(pthread_timers);
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if (!ao2_container_count(pthread_timers)) {
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ast_mutex_lock(&timing_thread.lock);
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ast_cond_signal(&timing_thread.cond);
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ast_mutex_unlock(&timing_thread.lock);
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}
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ao2_link_flags(pthread_timers, timer, OBJ_NOLOCK);
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ao2_unlock(pthread_timers);
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return timer;
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}
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static void pthread_timer_close(void *data)
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{
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struct pthread_timer *timer = data;
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ao2_unlink(pthread_timers, timer);
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ao2_ref(timer, -1);
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}
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static int pthread_timer_set_rate(void *data, unsigned int rate)
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{
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struct pthread_timer *timer = data;
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if (rate > MAX_RATE) {
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ast_log(LOG_ERROR, "res_timing_pthread only supports timers at a "
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"max rate of %d / sec\n", MAX_RATE);
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errno = EINVAL;
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return -1;
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}
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ao2_lock(timer);
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if ((timer->rate = rate)) {
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timer->interval = roundf(1000.0 / ((float) rate));
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timer->start = ast_tvnow();
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timer->state = TIMER_STATE_TICKING;
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} else {
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timer->interval = 0;
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timer->start = ast_tv(0, 0);
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timer->state = TIMER_STATE_IDLE;
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}
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timer->tick_count = 0;
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ao2_unlock(timer);
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return 0;
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}
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static int pthread_timer_ack(void *data, unsigned int quantity)
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{
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struct pthread_timer *timer = data;
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ast_assert(quantity > 0);
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ao2_lock(timer);
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ack_ticks(timer, quantity);
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ao2_unlock(timer);
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return 0;
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}
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static int pthread_timer_enable_continuous(void *data)
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{
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struct pthread_timer *timer = data;
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ao2_lock(timer);
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if (!timer->continuous) {
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timer->continuous = true;
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signal_pipe(timer);
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}
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ao2_unlock(timer);
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return 0;
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}
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static int pthread_timer_disable_continuous(void *data)
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{
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struct pthread_timer *timer = data;
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ao2_lock(timer);
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if (timer->continuous) {
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timer->continuous = false;
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unsignal_pipe(timer);
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}
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ao2_unlock(timer);
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return 0;
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}
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static enum ast_timer_event pthread_timer_get_event(void *data)
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{
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struct pthread_timer *timer = data;
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enum ast_timer_event res = AST_TIMING_EVENT_EXPIRED;
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ao2_lock(timer);
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if (timer->continuous) {
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res = AST_TIMING_EVENT_CONTINUOUS;
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}
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ao2_unlock(timer);
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return res;
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}
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static unsigned int pthread_timer_get_max_rate(void *data)
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{
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return MAX_RATE;
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}
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static int pthread_timer_fd(void *data)
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{
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struct pthread_timer *timer = data;
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return timer->pipe[PIPE_READ];
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}
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static void pthread_timer_destructor(void *obj)
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{
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struct pthread_timer *timer = obj;
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if (timer->pipe[PIPE_READ] > -1) {
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close(timer->pipe[PIPE_READ]);
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timer->pipe[PIPE_READ] = -1;
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}
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if (timer->pipe[PIPE_WRITE] > -1) {
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close(timer->pipe[PIPE_WRITE]);
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timer->pipe[PIPE_WRITE] = -1;
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}
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}
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/*!
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* \note only PIPE_READ is guaranteed valid
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*/
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static int pthread_timer_hash(const void *obj, const int flags)
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{
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const struct pthread_timer *timer = obj;
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return timer->pipe[PIPE_READ];
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}
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/*!
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* \note only PIPE_READ is guaranteed valid
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*/
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static int pthread_timer_cmp(void *obj, void *arg, int flags)
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{
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struct pthread_timer *timer1 = obj, *timer2 = arg;
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return (timer1->pipe[PIPE_READ] == timer2->pipe[PIPE_READ]) ? CMP_MATCH | CMP_STOP : 0;
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}
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/*!
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* \retval 0 no timer tick needed
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* \retval non-zero write to the timing pipe needed
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*/
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static int check_timer(struct pthread_timer *timer)
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{
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struct timeval now;
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if (timer->state == TIMER_STATE_IDLE) {
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return 0;
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}
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now = ast_tvnow();
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if (timer->tick_count < (ast_tvdiff_ms(now, timer->start) / timer->interval)) {
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timer->tick_count++;
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if (!timer->tick_count) {
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/* Handle overflow. */
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timer->start = now;
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}
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return 1;
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}
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return 0;
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}
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/*!
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* \internal
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* \pre timer is locked
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*/
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static void ack_ticks(struct pthread_timer *timer, unsigned int quantity)
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{
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int pending_ticks = timer->pending_ticks;
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ast_assert(quantity);
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if (quantity > pending_ticks) {
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quantity = pending_ticks;
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}
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if (!quantity) {
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return;
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}
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timer->pending_ticks -= quantity;
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if ((0 == timer->pending_ticks) && !timer->continuous) {
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unsignal_pipe(timer);
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}
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}
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/*!
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* \internal
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* \pre timer is locked
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*/
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static void signal_pipe(struct pthread_timer *timer)
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{
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ssize_t res;
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unsigned char x = 42;
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if (timer->pipe_signaled) {
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return;
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}
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res = write(timer->pipe[PIPE_WRITE], &x, 1);
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if (-1 == res) {
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ast_log(LOG_ERROR, "Error writing to timing pipe: %s\n",
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strerror(errno));
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} else {
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timer->pipe_signaled = true;
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}
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}
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/*!
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* \internal
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* \pre timer is locked
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*/
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static void unsignal_pipe(struct pthread_timer *timer)
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{
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ssize_t res;
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unsigned long buffer;
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if (!timer->pipe_signaled) {
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return;
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}
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res = read(timer->pipe[PIPE_READ], &buffer, sizeof(buffer));
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if (-1 == res) {
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ast_log(LOG_ERROR, "Error reading from pipe: %s\n",
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strerror(errno));
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} else {
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timer->pipe_signaled = false;
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}
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}
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static int run_timer(void *obj, void *arg, int flags)
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{
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struct pthread_timer *timer = obj;
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if (timer->state == TIMER_STATE_IDLE) {
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return 0;
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}
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ao2_lock(timer);
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if (check_timer(timer)) {
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timer->pending_ticks++;
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signal_pipe(timer);
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}
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ao2_unlock(timer);
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return 0;
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}
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static void *do_timing(void *arg)
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{
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struct timeval next_wakeup = ast_tvnow();
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while (!timing_thread.stop) {
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struct timespec ts = { 0, };
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ao2_callback(pthread_timers, OBJ_NODATA, run_timer, NULL);
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next_wakeup = ast_tvadd(next_wakeup, ast_tv(0, 5000));
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ts.tv_sec = next_wakeup.tv_sec;
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ts.tv_nsec = next_wakeup.tv_usec * 1000;
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ast_mutex_lock(&timing_thread.lock);
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if (!timing_thread.stop) {
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if (ao2_container_count(pthread_timers)) {
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ast_cond_timedwait(&timing_thread.cond, &timing_thread.lock, &ts);
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} else {
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ast_cond_wait(&timing_thread.cond, &timing_thread.lock);
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}
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}
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ast_mutex_unlock(&timing_thread.lock);
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}
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return NULL;
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}
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static int init_timing_thread(void)
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{
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ast_mutex_init(&timing_thread.lock);
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ast_cond_init(&timing_thread.cond, NULL);
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if (ast_pthread_create_background(&timing_thread.thread, NULL, do_timing, NULL)) {
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ast_log(LOG_ERROR, "Unable to start timing thread.\n");
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return -1;
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}
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return 0;
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}
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static int load_module(void)
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{
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if (!(pthread_timers = ao2_container_alloc(PTHREAD_TIMER_BUCKETS,
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pthread_timer_hash, pthread_timer_cmp))) {
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return AST_MODULE_LOAD_DECLINE;
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}
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if (init_timing_thread()) {
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ao2_ref(pthread_timers, -1);
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pthread_timers = NULL;
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return AST_MODULE_LOAD_DECLINE;
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}
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return (timing_funcs_handle = ast_register_timing_interface(&pthread_timing)) ?
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AST_MODULE_LOAD_SUCCESS : AST_MODULE_LOAD_DECLINE;
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}
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static int unload_module(void)
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{
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int res;
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ast_mutex_lock(&timing_thread.lock);
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timing_thread.stop = 1;
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ast_cond_signal(&timing_thread.cond);
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ast_mutex_unlock(&timing_thread.lock);
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pthread_join(timing_thread.thread, NULL);
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if (!(res = ast_unregister_timing_interface(timing_funcs_handle))) {
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ao2_ref(pthread_timers, -1);
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pthread_timers = NULL;
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}
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return res;
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}
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AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_LOAD_ORDER, "pthread Timing Interface",
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.support_level = AST_MODULE_SUPPORT_EXTENDED,
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.load = load_module,
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.unload = unload_module,
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.load_pri = AST_MODPRI_TIMING,
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);
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