WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/src/synch/mutex.c


/*
 * Copyright (C) 2001-2004 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
/**
 * @file    mutex.c
 * @brief   Mutexes.
 */
 
#include <synch/mutex.h>
#include <synch/semaphore.h>
#include <synch/synch.h>
 
/** Initialize mutex
 *
 * Initialize mutex.
 *
 * @param mtx Mutex.
 */
void mutex_initialize(mutex_t *mtx)
{
    semaphore_initialize(&mtx->sem, 1);
}
 
/** Acquire mutex
 *
 * Acquire mutex.
 * Timeout mode and non-blocking mode can be requested.
 *
 * @param mtx Mutex.
 * @param usec Timeout in microseconds.
 * @param trylock Switches between blocking and non-blocking mode.
 *
 * For exact description of possible combinations of
 * usec and trylock, see comment for waitq_sleep_timeout().
 *
 * @return See comment for waitq_sleep_timeout().
 */
int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int trylock)
{
    return _semaphore_down_timeout(&mtx->sem, usec, trylock);
}
 
/** Release mutex
 *
 * Release mutex.
 *
 * @param mtx Mutex.
 */
void mutex_unlock(mutex_t *mtx)
{
    semaphore_up(&mtx->sem);
}
 

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/src/synch/mutex.c – Rev 1248 → 1264

Rev 1248		Rev 1264
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
-		29	/**
-		30	* @file mutex.c
-		31	* @brief Mutexes.
-		32	*/
-		33
29	#include <synch/mutex.h>	34	#include <synch/mutex.h>
30	#include <synch/semaphore.h>	35	#include <synch/semaphore.h>
31	#include <synch/synch.h>	36	#include <synch/synch.h>
32		37
33	/** Initialize mutex	38	/** Initialize mutex
34	*	39	*
35	* Initialize mutex.	40	* Initialize mutex.
36	*	41	*
37	* @param mtx Mutex.	42	* @param mtx Mutex.
38	*/	43	*/
39	void mutex_initialize(mutex_t *mtx)	44	void mutex_initialize(mutex_t *mtx)
40	{	45	{
41	semaphore_initialize(&mtx->sem, 1);	46	semaphore_initialize(&mtx->sem, 1);
42	}	47	}
43		48
44	/** Acquire mutex	49	/** Acquire mutex
45	*	50	*
46	* Acquire mutex.	51	* Acquire mutex.
47	* Timeout mode and non-blocking mode can be requested.	52	* Timeout mode and non-blocking mode can be requested.
48	*	53	*
49	* @param mtx Mutex.	54	* @param mtx Mutex.
50	* @param usec Timeout in microseconds.	55	* @param usec Timeout in microseconds.
51	* @param trylock Switches between blocking and non-blocking mode.	56	* @param trylock Switches between blocking and non-blocking mode.
52	*	57	*
53	* For exact description of possible combinations of	58	* For exact description of possible combinations of
54	* usec and trylock, see comment for waitq_sleep_timeout().	59	* usec and trylock, see comment for waitq_sleep_timeout().
55	*	60	*
56	* @return See comment for waitq_sleep_timeout().	61	* @return See comment for waitq_sleep_timeout().
57	*/	62	*/
58	int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int trylock)	63	int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int trylock)
59	{	64	{
60	return _semaphore_down_timeout(&mtx->sem, usec, trylock);	65	return _semaphore_down_timeout(&mtx->sem, usec, trylock);
61	}	66	}
62		67
63	/** Release mutex	68	/** Release mutex
64	*	69	*
65	* Release mutex.	70	* Release mutex.
66	*	71	*
67	* @param mtx Mutex.	72	* @param mtx Mutex.
68	*/	73	*/
69	void mutex_unlock(mutex_t *mtx)	74	void mutex_unlock(mutex_t *mtx)
70	{	75	{
71	semaphore_up(&mtx->sem);	76	semaphore_up(&mtx->sem);
72	}	77	}
73		78