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.
 */
 
/** @addtogroup sync
 * @{
 */
 
/**
 * @file
 * @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 flags Specify mode of operation.
 *
 * For exact description of possible combinations of
 * usec and flags, see comment for waitq_sleep_timeout().
 *
 * @return See comment for waitq_sleep_timeout().
 */
int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int flags)
{
    return _semaphore_down_timeout(&mtx->sem, usec, flags);
}
 
/** 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 1702 → 1757

Rev 1702		Rev 1757
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	/** @addtogroup sync	29	/** @addtogroup sync
30	* @{	30	* @{
31	*/	31	*/
32		32
33	/**	33	/**
34	* @file	34	* @file
35	* @brief Mutexes.	35	* @brief Mutexes.
36	*/	36	*/
37		37
38	#include <synch/mutex.h>	38	#include <synch/mutex.h>
39	#include <synch/semaphore.h>	39	#include <synch/semaphore.h>
40	#include <synch/synch.h>	40	#include <synch/synch.h>
41		41
42	/** Initialize mutex	42	/** Initialize mutex
43	*	43	*
44	* Initialize mutex.	44	* Initialize mutex.
45	*	45	*
46	* @param mtx Mutex.	46	* @param mtx Mutex.
47	*/	47	*/
48	void mutex_initialize(mutex_t *mtx)	48	void mutex_initialize(mutex_t *mtx)
49	{	49	{
50	semaphore_initialize(&mtx->sem, 1);	50	semaphore_initialize(&mtx->sem, 1);
51	}	51	}
52		52
53	/** Acquire mutex	53	/** Acquire mutex
54	*	54	*
55	* Acquire mutex.	55	* Acquire mutex.
56	* Timeout mode and non-blocking mode can be requested.	56	* Timeout mode and non-blocking mode can be requested.
57	*	57	*
58	* @param mtx Mutex.	58	* @param mtx Mutex.
59	* @param usec Timeout in microseconds.	59	* @param usec Timeout in microseconds.
60	* @param flags Specify mode of operation.	60	* @param flags Specify mode of operation.
61	*	61	*
62	* For exact description of possible combinations of	62	* For exact description of possible combinations of
63	* usec and flags, see comment for waitq_sleep_timeout().	63	* usec and flags, see comment for waitq_sleep_timeout().
64	*	64	*
65	* @return See comment for waitq_sleep_timeout().	65	* @return See comment for waitq_sleep_timeout().
66	*/	66	*/
67	int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int flags)	67	int _mutex_lock_timeout(mutex_t *mtx, __u32 usec, int flags)
68	{	68	{
69	return _semaphore_down_timeout(&mtx->sem, usec, flags);	69	return _semaphore_down_timeout(&mtx->sem, usec, flags);
70	}	70	}
71		71
72	/** Release mutex	72	/** Release mutex
73	*	73	*
74	* Release mutex.	74	* Release mutex.
75	*	75	*
76	* @param mtx Mutex.	76	* @param mtx Mutex.
77	*/	77	*/
78	void mutex_unlock(mutex_t *mtx)	78	void mutex_unlock(mutex_t *mtx)
79	{	79	{
80	semaphore_up(&mtx->sem);	80	semaphore_up(&mtx->sem);
81	}	81	}
82		82
83		-
84	/** @}	83	/** @}
85	*/	84	*/
86		-
87		85