126 lines
2.9 KiB
C
126 lines
2.9 KiB
C
#include <minix/mthread.h>
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#include "global.h"
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/*===========================================================================*
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* mthread_event_init *
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*===========================================================================*/
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PUBLIC int mthread_event_init(event)
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mthread_event_t *event; /* The event to be initialized */
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{
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/* Initialize an event object.
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*/
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int r;
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if (!event)
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return EINVAL;
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r = mthread_mutex_init(&event->mutex, NULL);
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if (r != 0)
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return r;
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r = mthread_cond_init(&event->cond, NULL);
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if (r != 0)
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mthread_mutex_destroy(&event->mutex);
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return r;
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}
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/*===========================================================================*
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* mthread_event_destroy *
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*===========================================================================*/
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PUBLIC int mthread_event_destroy(event)
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mthread_event_t *event; /* The event to be destroyed */
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{
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/* Destroy an event object.
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*/
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int r;
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if (!event)
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return EINVAL;
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r = mthread_cond_destroy(&event->cond);
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if (r != 0)
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return r;
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return mthread_mutex_destroy(&event->mutex);
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}
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/*===========================================================================*
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* mthread_event_wait *
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*===========================================================================*/
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PUBLIC int mthread_event_wait(event)
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mthread_event_t *event; /* The event to be waited on */
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{
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/* Wait for an event, blocking the current thread in the process.
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*/
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int r;
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if (!event)
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return EINVAL;
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r = mthread_mutex_lock(&event->mutex);
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if (r != 0)
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return r;
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r = mthread_cond_wait(&event->cond, &event->mutex);
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if (r != 0) {
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mthread_mutex_unlock(&event->mutex);
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return r;
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}
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return mthread_mutex_unlock(&event->mutex);
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}
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/*===========================================================================*
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* mthread_event_fire *
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*===========================================================================*/
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PUBLIC int mthread_event_fire(event)
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mthread_event_t *event; /* The event to be fired */
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{
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/* Fire an event, waking up any thread blocked on it.
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*/
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int r;
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if (!event)
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return EINVAL;
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r = mthread_mutex_lock(&event->mutex);
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if (r != 0)
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return r;
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r = mthread_cond_signal(&event->cond);
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if (r != 0) {
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mthread_mutex_unlock(&event->mutex);
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return r;
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}
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return mthread_mutex_unlock(&event->mutex);
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}
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/*===========================================================================*
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* mthread_event_fire_all *
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*===========================================================================*/
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PUBLIC int mthread_event_fire_all(event)
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mthread_event_t *event; /* The event to be fired */
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{
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/* Fire an event, waking up any thread blocked on it.
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*/
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int r;
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if (!event)
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return EINVAL;
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r = mthread_mutex_lock(&event->mutex);
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if (r != 0)
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return r;
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r = mthread_cond_broadcast(&event->cond);
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if (r != 0) {
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mthread_mutex_unlock(&event->mutex);
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return r;
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}
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return mthread_mutex_unlock(&event->mutex);
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}
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