Subversion Repositories c0or1k

/*

 * User space locking

 *

 * Copyright (C) 2009 Bahadir Bilgehan Balban

 */

#ifndef __L4_MUTEX_H__

#define __L4_MUTEX_H__

#if !defined(__ASSEMBLY__)

#include <l4/api/mutex.h>

struct l4_mutex {

        int lock;

} __attribute__((aligned(sizeof(int))));

void l4_mutex_init(struct l4_mutex *m);

int l4_mutex_lock(struct l4_mutex *m);

int l4_mutex_unlock(struct l4_mutex *m);

#endif

/* Mutex return value - don't mix up with mutes state */

#define L4_MUTEX_CONTENDED      -1

#define L4_MUTEX_SUCCESS        0

/*

 * Mutex states:

 * Unlocked = -1, locked = 0, anything above 0 tells

 * number of contended threads

 */

#define L4_MUTEX_LOCKED                 0

#define L4_MUTEX_UNLOCKED               -1

#define L4_MUTEX(m)     \

        struct l4_mutex m = { L4_MUTEX_UNLOCKED }

#endif /* __L4_MUTEX_H__ */