Permalink
Fetching contributors…
Cannot retrieve contributors at this time
24 lines (19 sloc) 839 Bytes
#include "upwaker.h"
#include <stdlib.h>
upwaker_t *create_upwaker(void) {
upwaker_t *upwaker = calloc(1,sizeof(upwaker_t));
ATOMIC_SET(upwaker->please_wakeup, false);
pthread_mutex_init(&upwaker->mutex,NULL);
pthread_cond_init(&upwaker->cond,NULL);
return upwaker;
}
void upwaker_sleep(upwaker_t *upwaker) {
if(ATOMIC_GET(upwaker->please_wakeup)==false)
pthread_cond_wait(&upwaker->cond,&upwaker->mutex);
ATOMIC_SET(upwaker->please_wakeup, false);
}
void upwaker_wake_up(upwaker_t *upwaker) {
ATOMIC_SET(upwaker->please_wakeup, true);
pthread_cond_broadcast(&upwaker->cond); // Must call, in case the other thread had finished the 'if' test before this function was called.
// (i.e. it is not safe to trylock the mutex to check wether to call pthread_cond_broadcast).
}