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/*

 * The elementary concurrency constructs.

 *

 * Copyright (C) 2007 Bahadir Balban

 */

#ifndef __LIB_MUTEX_H__

#define __LIB_MUTEX_H__

#include <l4/lib/string.h>

#include <l4/lib/spinlock.h>

#include <l4/lib/list.h>

#include <l4/lib/printk.h>

#include <l4/lib/wait.h>

#include INC_ARCH(mutex.h)

/* A mutex is a binary semaphore that can sleep. */

struct mutex {

        struct waitqueue_head wqh;

        unsigned int lock;

};

static inline void mutex_init(struct mutex *mutex)

{

        memset(mutex, 0, sizeof(struct mutex));

        waitqueue_head_init(&mutex->wqh);

}

int mutex_trylock(struct mutex *mutex);

int mutex_lock(struct mutex *mutex);

void mutex_unlock(struct mutex *mutex);

void mutex_unlock_async(struct mutex *mutex);

/* NOTE: Since spinlocks guard mutex acquiring & sleeping, no locks needed */

static inline int mutex_inc(unsigned int *cnt)

{

        return ++*cnt;

}

static inline int mutex_dec(unsigned int *cnt)

{

        return --*cnt;

}

#endif /* __LIB_MUTEX_H__ */