WebSVN – HelenOS – Diff – /trunk/kernel/generic/include/synch/rwlock.h


/*
 * 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
 */
 
#ifndef KERN_RWLOCK_H_
#define KERN_RWLOCK_H_
 
#include <arch/types.h>
#include <synch/mutex.h>
#include <synch/synch.h>
#include <synch/spinlock.h>
 
typedef enum {
    RWLOCK_NONE,
    RWLOCK_READER,
    RWLOCK_WRITER
} rwlock_type_t;
 
typedef struct {
    SPINLOCK_DECLARE(lock);
    /**
     * Mutex for writers, readers can bypass it if readers_in is positive.
     */
    mutex_t exclusive;
    /** Number of readers in critical section. */
    count_t readers_in;
} rwlock_t;
 
#define rwlock_write_lock(rwl) \
    _rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
#define rwlock_read_lock(rwl) \
    _rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
#define rwlock_write_trylock(rwl) \
    _rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \
        SYNCH_FLAGS_NON_BLOCKING)
#define rwlock_read_trylock(rwl) \
    _rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \
        SYNCH_FLAGS_NON_BLOCKING)
#define rwlock_write_lock_timeout(rwl, usec) \
    _rwlock_write_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE)
#define rwlock_read_lock_timeout(rwl, usec) \
    _rwlock_read_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE)
 
extern void rwlock_initialize(rwlock_t *rwl);
extern void rwlock_read_unlock(rwlock_t *rwl);
extern void rwlock_write_unlock(rwlock_t *rwl);
extern int _rwlock_read_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags);
extern int _rwlock_write_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags);
 
#endif
 
/** @}
 */
 

Rev 2089	Rev 2106
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	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef KERN_RWLOCK_H_	35	#ifndef KERN_RWLOCK_H_
36	#define KERN_RWLOCK_H_	36	#define KERN_RWLOCK_H_
37		37
38	#include <arch/types.h>	38	#include <arch/types.h>
39	#include <synch/mutex.h>	39	#include <synch/mutex.h>
40	#include <synch/synch.h>	40	#include <synch/synch.h>
41	#include <synch/spinlock.h>	41	#include <synch/spinlock.h>
42		42
43	typedef enum {	43	typedef enum {
44	RWLOCK_NONE,	44	RWLOCK_NONE,
45	RWLOCK_READER,	45	RWLOCK_READER,
46	RWLOCK_WRITER	46	RWLOCK_WRITER
47	} rwlock_type_t;	47	} rwlock_type_t;
48		48
49	typedef struct {	49	typedef struct {
50	SPINLOCK_DECLARE(lock);	50	SPINLOCK_DECLARE(lock);
-		51	/**
51	mutex_t exclusive; /*< Mutex for writers, readers can bypass it if readers_in is positive. /	52	* Mutex for writers, readers can bypass it if readers_in is positive.
-		53	*/
-		54	mutex_t exclusive;
52	count_t readers_in; /*< Number of readers in critical section. /	55	/** Number of readers in critical section. */
-		56	count_t readers_in;
53	} rwlock_t;	57	} rwlock_t;
54		58
55	#define rwlock_write_lock(rwl) \	59	#define rwlock_write_lock(rwl) \
56	_rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)	60	_rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
57	#define rwlock_read_lock(rwl) \	61	#define rwlock_read_lock(rwl) \
58	_rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NONE)	62	_rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, SYNCH_FLAGS_NONE)
59	#define rwlock_write_trylock(rwl) \	63	#define rwlock_write_trylock(rwl) \
60	_rwlock_write_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING)	64	_rwlock_write_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \
-		65	SYNCH_FLAGS_NON_BLOCKING)
61	#define rwlock_read_trylock(rwl) \	66	#define rwlock_read_trylock(rwl) \
62	_rwlock_read_lock_timeout((rwl),SYNCH_NO_TIMEOUT,SYNCH_FLAGS_NON_BLOCKING)	67	_rwlock_read_lock_timeout((rwl), SYNCH_NO_TIMEOUT, \
-		68	SYNCH_FLAGS_NON_BLOCKING)
63	#define rwlock_write_lock_timeout(rwl,usec) \	69	#define rwlock_write_lock_timeout(rwl, usec) \
64	_rwlock_write_lock_timeout((rwl),(usec),SYNCH_FLAGS_NONE)	70	_rwlock_write_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE)
65	#define rwlock_read_lock_timeout(rwl,usec) \	71	#define rwlock_read_lock_timeout(rwl, usec) \
66	_rwlock_read_lock_timeout((rwl),(usec),SYNCH_FLAGS_NONE)	72	_rwlock_read_lock_timeout((rwl), (usec), SYNCH_FLAGS_NONE)
67		73
68	extern void rwlock_initialize(rwlock_t *rwl);	74	extern void rwlock_initialize(rwlock_t *rwl);
69	extern void rwlock_read_unlock(rwlock_t *rwl);	75	extern void rwlock_read_unlock(rwlock_t *rwl);
70	extern void rwlock_write_unlock(rwlock_t *rwl);	76	extern void rwlock_write_unlock(rwlock_t *rwl);
71	extern int _rwlock_read_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags);	77	extern int _rwlock_read_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags);
72	extern int _rwlock_write_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags);	78	extern int _rwlock_write_lock_timeout(rwlock_t *rwl, uint32_t usec, int flags);
73		79
74	#endif	80	#endif
75		81
76	/** @}	82	/** @}
77	*/	83	*/
78		84

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/include/synch/rwlock.h – Rev 2089 → 2106