mutex.h

 
#pragma once
 
#include <stdint.h>
#include <arch/sysenter.h>
 
#define MUTEX_INITIALIZED               1
 
#define FUTEX_STATIC_INIT       { 0xFF, 0, 0 }
 
#define FUTEX_SUCCESS                   0
#define FUTEX_FAILURE                   1
 
typedef struct {
    uint8_t state;
    uint8_t owner;
} futex_t;
 
/* Mutex structure.
 * It wraps futex, which is being operated from within
 * kernel context. Kernel is using futex internally, so
 * there is no need to use big kernel lock.
 */
typedef futex_t mutex_t;
 
int futex_init(futex_t * restrict futex);
int futex_destroy(futex_t * futex);
int futex_lock(futex_t * futex);
int futex_unlock(futex_t * futex);
int futex_trylock(futex_t * futex);