cx-zivuos/headers/zivuos/mutex.h

#ifndef CX_ZIVUOS_MUTEX_H_INCLUDED
#define CX_ZIVUOS_MUTEX_H_INCLUDED

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

typedef volatile enum zv_mutex_e {
    ZV_MUTEX_FREE,
    ZV_MUTEX_LOCKED
} zv_mutex_t;

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

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

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

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

#endif