145 lines
3.7 KiB
C
145 lines
3.7 KiB
C
/*
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* Copyright (c) 2015 John R. Bradley <jrb@turrettech.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "ff-timer.h"
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#include <libavutil/time.h>
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#include <time.h>
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#include <string.h>
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#include <assert.h>
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static void *timer_thread(void *opaque)
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{
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struct ff_timer *timer = (struct ff_timer *)opaque;
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int ret;
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while (true) {
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bool callback = false;
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pthread_mutex_lock(&timer->mutex);
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if (timer->abort) {
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pthread_mutex_unlock(&timer->mutex);
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break;
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}
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uint64_t current_time = av_gettime();
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if (current_time < timer->next_wake) {
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struct timespec sleep_time = {
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.tv_sec = timer->next_wake / AV_TIME_BASE,
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.tv_nsec = (timer->next_wake % AV_TIME_BASE) *
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1000};
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ret = pthread_cond_timedwait(
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&timer->cond, &timer->mutex, &sleep_time);
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if (ret != ETIMEDOUT) {
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// failed to wait, just sleep
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av_usleep((unsigned)(timer->next_wake -
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current_time));
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}
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pthread_mutex_unlock(&timer->mutex);
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continue;
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// we can be woken up merely to set a sooner wake time
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} else {
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// no new next_wake, sleep until we get something
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av_usleep(1000);
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}
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// we woke up for some reason
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current_time = av_gettime();
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if (timer->next_wake <= current_time || timer->needs_wake) {
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callback = true;
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timer->needs_wake = false;
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}
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pthread_mutex_unlock(&timer->mutex);
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if (callback)
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timer->callback(timer->opaque);
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}
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return NULL;
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}
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bool ff_timer_init(struct ff_timer *timer, ff_timer_callback callback,
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void *opaque)
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{
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memset(timer, 0, sizeof(struct ff_timer));
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timer->abort = false;
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timer->callback = callback;
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timer->opaque = opaque;
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if (pthread_mutexattr_init(&timer->mutexattr) != 0)
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goto fail;
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if (pthread_mutexattr_settype(&timer->mutexattr,
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PTHREAD_MUTEX_RECURSIVE))
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goto fail1;
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if (pthread_mutex_init(&timer->mutex, &timer->mutexattr) != 0)
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goto fail1;
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if (pthread_cond_init(&timer->cond, NULL) != 0)
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goto fail2;
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if (pthread_create(&timer->timer_thread, NULL, timer_thread, timer) !=
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0)
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goto fail3;
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return true;
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fail3:
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pthread_cond_destroy(&timer->cond);
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fail2:
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pthread_mutex_destroy(&timer->mutex);
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fail1:
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pthread_mutexattr_destroy(&timer->mutexattr);
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fail:
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return false;
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}
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void ff_timer_free(struct ff_timer *timer)
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{
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void *thread_result;
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assert(timer != NULL);
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pthread_mutex_lock(&timer->mutex);
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timer->abort = true;
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pthread_cond_signal(&timer->cond);
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pthread_mutex_unlock(&timer->mutex);
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pthread_join(timer->timer_thread, &thread_result);
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pthread_mutex_destroy(&timer->mutex);
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pthread_mutexattr_destroy(&timer->mutexattr);
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pthread_cond_destroy(&timer->cond);
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}
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void ff_timer_schedule(struct ff_timer *timer, uint64_t microseconds)
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{
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uint64_t cur_time = av_gettime();
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uint64_t new_wake_time = cur_time + microseconds;
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pthread_mutex_lock(&timer->mutex);
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timer->needs_wake = true;
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if (new_wake_time < timer->next_wake || cur_time > timer->next_wake)
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timer->next_wake = new_wake_time;
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pthread_cond_signal(&timer->cond);
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pthread_mutex_unlock(&timer->mutex);
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}
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