cx-zivuos/sources/mutex.c

#include <stdint.h>
#include <stdbool.h>

#include "mutex.h"

enum zv_mutex_e zv_mutex_create() {
    return ZV_MUTEX_FREE;
}

bool zv_mutex_try_lock(zv_mutex_t *self) {
    zv_mutex_t required = ZV_MUTEX_FREE;

    return __atomic_compare_exchange_n(
        self, 
        (void *) &required, 
        ZV_MUTEX_LOCKED, 
        false, 
        __ATOMIC_ACQ_REL, 
        __ATOMIC_ACQUIRE
    );
}

bool zv_mutex_is_free(zv_mutex_t *self) {
    return __atomic_load_n(self, __ATOMIC_ACQUIRE) == ZV_MUTEX_FREE; 
}

void zv_mutex_unlock(zv_mutex_t *self) {
    __atomic_store_n(self, ZV_MUTEX_FREE, __ATOMIC_RELEASE);
}