mtk-lk/include/kernel/mutex.h

/*
 * Copyright (c) 2008 Travis Geiselbrecht
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files
 * (the "Software"), to deal in the Software without restriction,
 * including without limitation the rights to use, copy, modify, merge,
 * publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#ifndef __KERNEL_MUTEX_H
#define __KERNEL_MUTEX_H

#include <kernel/thread.h>

#define MUTEX_MAGIC 'mutx'

typedef struct mutex {
	int magic;
	int count;
	thread_t *holder;
	wait_queue_t wait;
} mutex_t;

/* Rules for Mutexes:
 * - Mutexes are only safe to use from thread context.
 * - Mutexes are non-recursive.
*/

void mutex_init(mutex_t *);
void mutex_destroy(mutex_t *);
status_t mutex_acquire(mutex_t *);
status_t mutex_acquire_timeout(mutex_t *, time_t); /* try to acquire the mutex with a timeout value */
status_t mutex_release(mutex_t *);

#endif