72 lines
2.4 KiB
C
72 lines
2.4 KiB
C
|
/* This file contains a simple thread event implementation.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <minix/mthread.h>
|
||
|
|
#include <minix/sysutil.h>
|
||
|
|
|
||
|
|
#include "event.h"
|
||
|
|
|
||
|
|
/*===========================================================================*
|
||
|
|
* driver_event_init *
|
||
|
|
*===========================================================================*/
|
||
|
|
PUBLIC void driver_event_init(event_t *event)
|
||
|
|
{
|
||
|
|
/* Initialize an event object.
|
||
|
|
*/
|
||
|
|
int r;
|
||
|
|
|
||
|
|
if ((r = mthread_mutex_init(&event->mutex, NULL)) != 0)
|
||
|
|
panic("libdriver: error initializing mutex (%d)", r);
|
||
|
|
if ((r = mthread_cond_init(&event->cond, NULL)) != 0)
|
||
|
|
panic("libdriver: error initializing condvar (%d)", r);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*===========================================================================*
|
||
|
|
* driver_event_destroy *
|
||
|
|
*===========================================================================*/
|
||
|
|
PUBLIC void driver_event_destroy(event_t *event)
|
||
|
|
{
|
||
|
|
/* Destroy an event object.
|
||
|
|
*/
|
||
|
|
int r;
|
||
|
|
|
||
|
|
if ((r = mthread_cond_destroy(&event->cond)) != 0)
|
||
|
|
panic("libdriver: error destroying condvar (%d)", r);
|
||
|
|
if ((r = mthread_mutex_destroy(&event->mutex)) != 0)
|
||
|
|
panic("libdriver: error destroying mutex (%d)", r);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*===========================================================================*
|
||
|
|
* driver_event_wait *
|
||
|
|
*===========================================================================*/
|
||
|
|
PUBLIC void driver_event_wait(event_t *event)
|
||
|
|
{
|
||
|
|
/* Wait for an event, blocking the current thread in the process.
|
||
|
|
*/
|
||
|
|
int r;
|
||
|
|
|
||
|
|
if ((r = mthread_mutex_lock(&event->mutex)) != 0)
|
||
|
|
panic("libdriver: error locking mutex (%d)", r);
|
||
|
|
if ((r = mthread_cond_wait(&event->cond, &event->mutex)) != 0)
|
||
|
|
panic("libdriver: error waiting for condvar (%d)", r);
|
||
|
|
if ((r = mthread_mutex_unlock(&event->mutex)) != 0)
|
||
|
|
panic("libdriver: error unlocking mutex (%d)", r);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*===========================================================================*
|
||
|
|
* driver_event_fire *
|
||
|
|
*===========================================================================*/
|
||
|
|
PUBLIC void driver_event_fire(event_t *event)
|
||
|
|
{
|
||
|
|
/* Fire an event, waking up any thread blocked on it without scheduling it.
|
||
|
|
*/
|
||
|
|
int r;
|
||
|
|
|
||
|
|
if ((r = mthread_mutex_lock(&event->mutex)) != 0)
|
||
|
|
panic("libdriver: error locking mutex (%d)", r);
|
||
|
|
if ((r = mthread_cond_signal(&event->cond)) != 0)
|
||
|
|
panic("libdriver: error signaling condvar (%d)", r);
|
||
|
|
if ((r = mthread_mutex_unlock(&event->mutex)) != 0)
|
||
|
|
panic("libdriver: error unlocking mutex (%d)", r);
|
||
|
|
}
|