cc472d0713
The mutex must be unlocked regardless of what the return value is or it will be locked forever if the return value isn't 0.
152 lines
3.2 KiB
C
152 lines
3.2 KiB
C
/*
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* Copyright (c) 2014 Hugh Bailey <obs.jim@gmail.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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#ifdef __APPLE__
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#include <sys/time.h>
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#endif
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#include "bmem.h"
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#include "threading.h"
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struct event_data {
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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volatile bool signalled;
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bool manual;
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};
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int event_init(event_t *event, enum event_type type)
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{
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int code = 0;
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struct event_data *data = bzalloc(sizeof(struct event_data));
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if ((code = pthread_mutex_init(&data->mutex, NULL)) < 0) {
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bfree(data);
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return code;
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}
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if ((code = pthread_cond_init(&data->cond, NULL)) < 0) {
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pthread_mutex_destroy(&data->mutex);
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bfree(data);
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return code;
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}
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data->manual = (type == EVENT_TYPE_MANUAL);
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data->signalled = false;
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*event = data;
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return 0;
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}
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void event_destroy(event_t event)
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{
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if (event) {
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pthread_mutex_destroy(&event->mutex);
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pthread_cond_destroy(&event->cond);
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bfree(event);
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}
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}
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int event_wait(event_t event)
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{
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int code = 0;
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pthread_mutex_lock(&event->mutex);
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if (!event->signalled)
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code = pthread_cond_wait(&event->cond, &event->mutex);
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if (code == 0) {
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if (!event->manual)
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event->signalled = false;
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pthread_mutex_unlock(&event->mutex);
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}
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return code;
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}
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static inline void add_ms_to_ts(struct timespec *ts,
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unsigned long milliseconds)
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{
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ts->tv_sec += milliseconds/1000;
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ts->tv_nsec += (milliseconds%1000)*1000000;
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if (ts->tv_nsec > 1000000000) {
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ts->tv_sec += 1;
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ts->tv_nsec -= 1000000000;
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}
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}
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int event_timedwait(event_t event, unsigned long milliseconds)
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{
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int code = 0;
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pthread_mutex_lock(&event->mutex);
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if (!event->signalled) {
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struct timespec ts;
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#ifdef __APPLE__
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struct timeval tv;
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gettimeofday(&tv, NULL);
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ts.tv_sec = tv.tv_sec;
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ts.tv_nsec = tv.tv_usec * 1000;
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#else
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clock_gettime(CLOCK_REALTIME, &ts);
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#endif
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add_ms_to_ts(&ts, milliseconds);
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code = pthread_cond_timedwait(&event->cond, &event->mutex, &ts);
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}
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if (code == 0) {
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if (!event->manual)
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event->signalled = false;
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}
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pthread_mutex_unlock(&event->mutex);
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return code;
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}
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int event_try(event_t event)
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{
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int ret = EAGAIN;
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pthread_mutex_lock(&event->mutex);
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if (event->signalled) {
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if (!event->manual)
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event->signalled = false;
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ret = 0;
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}
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pthread_mutex_unlock(&event->mutex);
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return ret;
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}
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int event_signal(event_t event)
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{
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int code = 0;
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pthread_mutex_lock(&event->mutex);
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code = pthread_cond_signal(&event->cond);
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event->signalled = true;
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pthread_mutex_unlock(&event->mutex);
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return code;
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}
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void event_reset(event_t event)
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{
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pthread_mutex_lock(&event->mutex);
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event->signalled = false;
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pthread_mutex_unlock(&event->mutex);
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}
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