minix/lib/libmthread/event.c
Lionel Sambuc d3d33afe9f Experimental pthread compatibility library
This patch adds pthread compatibility by using libmthread.

To use this with a program using pthreads, you have to replace
  #include <pthread>
with
  #define _MTHREADIFY_PTHREADS
  #include <minix/mthreads>

This also changes the initialization function to be a constructor, which
is implicitly called before the call to main. This allows for
conformance with pthreads, while not paying a high price by checking on
each mthread_* call whether the library has been initialized or not.

As mthread_init is now a constructor, it also has been set as static, and
relevent calls removed from programs using it.

Change-Id: I2aa375db557958d2bee9a70d285aabb990c88f00
2014-07-28 17:05:08 +02:00

134 lines
3.2 KiB
C

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