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491 lines
10 KiB
491 lines
10 KiB
/*
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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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#include "asterisk.h"
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ASTERISK_FILE_VERSION(__FILE__, "$Revision$");
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#include <math.h>
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#include <sys/select.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 int pthread_timer_open(void);
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static void pthread_timer_close(int handle);
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static int pthread_timer_set_rate(int handle, unsigned int rate);
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static void pthread_timer_ack(int handle, unsigned int quantity);
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static int pthread_timer_enable_continuous(int handle);
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static int pthread_timer_disable_continuous(int handle);
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static enum ast_timing_event pthread_timer_get_event(int handle);
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static unsigned int pthread_timer_get_max_rate(int handle);
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static struct ast_timing_functions pthread_timing_functions = {
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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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};
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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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TIMER_STATE_CONTINUOUS,
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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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struct timeval start;
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};
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static void pthread_timer_destructor(void *obj);
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static struct pthread_timer *find_timer(int handle, int unlinkobj);
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static void write_byte(int wr_fd);
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static void read_pipe(int rd_fd, unsigned int num, int clear);
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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 int pthread_timer_open(void)
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{
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struct pthread_timer *timer;
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int fd;
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if (!(timer = ao2_alloc(sizeof(*timer), pthread_timer_destructor))) {
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errno = ENOMEM;
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return -1;
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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 -1;
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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(pthread_timers, timer);
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ao2_unlock(pthread_timers);
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fd = timer->pipe[PIPE_READ];
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ao2_ref(timer, -1);
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return fd;
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}
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static void pthread_timer_close(int handle)
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{
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struct pthread_timer *timer;
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if (!(timer = find_timer(handle, 1))) {
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return;
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}
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ao2_ref(timer, -1);
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}
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static int pthread_timer_set_rate(int handle, unsigned int rate)
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{
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struct pthread_timer *timer;
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if (!(timer = find_timer(handle, 0))) {
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errno = EINVAL;
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return -1;
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}
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if (rate > MAX_RATE) {
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ast_log(LOG_ERROR, "res_timing_pthread only supports timers at a max rate of %d / sec\n",
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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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timer->rate = rate;
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timer->state = rate ? TIMER_STATE_TICKING : TIMER_STATE_IDLE;
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timer->interval = rate ? roundf(1000.0 / ((float) rate)) : 0;
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timer->start = rate ? ast_tvnow() : ast_tv(0, 0);
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timer->tick_count = 0;
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ao2_unlock(timer);
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ao2_ref(timer, -1);
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return 0;
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}
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static void pthread_timer_ack(int handle, unsigned int quantity)
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{
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struct pthread_timer *timer;
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ast_assert(quantity > 0);
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if (!(timer = find_timer(handle, 0))) {
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return;
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}
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if (timer->state == TIMER_STATE_CONTINUOUS) {
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/* Leave the pipe alone, please! */
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return;
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}
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read_pipe(timer->pipe[PIPE_READ], quantity, 0);
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ao2_ref(timer, -1);
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}
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static int pthread_timer_enable_continuous(int handle)
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{
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struct pthread_timer *timer;
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if (!(timer = find_timer(handle, 0))) {
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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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timer->state = TIMER_STATE_CONTINUOUS;
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write_byte(timer->pipe[PIPE_WRITE]);
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ao2_unlock(timer);
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ao2_ref(timer, -1);
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return 0;
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}
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static int pthread_timer_disable_continuous(int handle)
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{
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struct pthread_timer *timer;
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if (!(timer = find_timer(handle, 0))) {
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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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timer->state = timer->rate ? TIMER_STATE_TICKING : TIMER_STATE_IDLE;
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read_pipe(timer->pipe[PIPE_READ], 0, 1);
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ao2_unlock(timer);
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ao2_ref(timer, -1);
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return 0;
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}
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static enum ast_timing_event pthread_timer_get_event(int handle)
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{
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struct pthread_timer *timer;
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enum ast_timing_event res = AST_TIMING_EVENT_EXPIRED;
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if (!(timer = find_timer(handle, 0))) {
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return res;
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}
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if (timer->state == TIMER_STATE_CONTINUOUS) {
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res = AST_TIMING_EVENT_CONTINUOUS;
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}
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ao2_ref(timer, -1);
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return res;
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}
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static unsigned int pthread_timer_get_max_rate(int handle)
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{
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return MAX_RATE;
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}
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static struct pthread_timer *find_timer(int handle, int unlinkobj)
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{
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struct pthread_timer *timer;
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struct pthread_timer tmp_timer;
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int flags = OBJ_POINTER;
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tmp_timer.pipe[PIPE_READ] = handle;
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if (unlinkobj) {
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flags |= OBJ_UNLINK;
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}
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if (!(timer = ao2_find(pthread_timers, &tmp_timer, flags))) {
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ast_assert(timer != NULL);
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return NULL;
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}
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return timer;
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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 : 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 || timer->state == TIMER_STATE_CONTINUOUS) {
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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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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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static void read_pipe(int rd_fd, unsigned int quantity, int clear)
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{
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ast_assert(quantity || clear);
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if (!quantity && clear) {
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quantity = 1;
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}
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do {
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unsigned char buf[1024];
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ssize_t res;
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fd_set rfds;
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struct timeval timeout = {
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.tv_sec = 0,
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};
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/* Make sure there is data to read */
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FD_ZERO(&rfds);
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FD_SET(rd_fd, &rfds);
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if (select(rd_fd + 1, &rfds, NULL, NULL, &timeout) != 1) {
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break;
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}
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res = read(rd_fd, buf,
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(quantity < sizeof(buf)) ? quantity : sizeof(buf));
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if (res == -1) {
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if (errno == EAGAIN) {
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continue;
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}
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ast_log(LOG_ERROR, "read failed on timing pipe: %s\n", strerror(errno));
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break;
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}
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if (clear) {
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continue;
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}
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quantity -= res;
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} while (quantity);
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}
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static void write_byte(int wr_fd)
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{
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do {
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ssize_t res;
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unsigned char x = 42;
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res = write(wr_fd, &x, 1);
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if (res == -1) {
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if (errno == EAGAIN) {
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continue;
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}
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ast_log(LOG_ERROR, "Error writing to timing pipe: %s\n", strerror(errno));
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}
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} while (0);
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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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write_byte(timer->pipe[PIPE_WRITE]);
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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_install_timing_functions(&pthread_timing_functions)) ?
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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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#if 0
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/* XXX code to stop the timing thread ... */
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ast_uninstall_timing_functions(timing_funcs_handle);
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ao2_ref(pthread_timers, -1);
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#endif
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/* This module can not currently be unloaded. No use count handling is being done. */
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return -1;
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "pthread Timing Interface");
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