WebSVN – HelenOS-historic – Diff – /kernel/trunk/generic/include/synch/spinlock.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 __SPINLOCK_H__
#define __SPINLOCK_H__
 
#include <arch/types.h>
#include <typedefs.h>
#include <preemption.h>
#include <atomic.h>
#include <debug.h>
 
#ifdef CONFIG_SMP
struct spinlock {
#ifdef CONFIG_DEBUG_SPINLOCK
    char *name;
#endif
    atomic_t val;
};
 
/*
 * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,
 * where the lock gets initialized in run time.
 */
#define SPINLOCK_DECLARE(slname)    spinlock_t slname
 
/*
 * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.
 * It declares and initializes the lock.
 */
#ifdef CONFIG_DEBUG_SPINLOCK
#define SPINLOCK_INITIALIZE(slname)     \
    spinlock_t slname = {       \
        .name = #slname,    \
        .val = { 0 }        \
    }
#else
#define SPINLOCK_INITIALIZE(slname)     \
    spinlock_t slname = {       \
        .val = { 0 }        \
    }
#endif
 
extern void spinlock_initialize(spinlock_t *sl, char *name);
extern int spinlock_trylock(spinlock_t *sl);
extern void spinlock_lock_debug(spinlock_t *sl);
 
#ifdef CONFIG_DEBUG_SPINLOCK
#  define spinlock_lock(x) spinlock_lock_debug(x)
#else
#  define spinlock_lock(x) atomic_lock_arch(&(x)->val)
#endif
 
/** Unlock spinlock
 *
 * Unlock spinlock.
 *
 * @param sl Pointer to spinlock_t structure.
 */
static inline void spinlock_unlock(spinlock_t *sl)
{
    ASSERT(atomic_get(&sl->val) != 0);
 
    /*
     * Prevent critical section code from bleeding out this way down.
     */
    CS_LEAVE_BARRIER();
   
    atomic_set(&sl->val,0);
    preemption_enable();
}
 
#else
 
/* On UP systems, spinlocks are effectively left out. */
#define SPINLOCK_DECLARE(name)
#define SPINLOCK_INITIALIZE(name)
 
#define spinlock_initialize(x,name)
#define spinlock_lock(x)        preemption_disable()
#define spinlock_trylock(x)         (preemption_disable(), 1)
#define spinlock_unlock(x)      preemption_enable()
 
#endif
 
#endif
 
 /** @}
 */
 
 

Rev 1104	Rev 1702
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
-		30	* @{
-		31	*/
-		32	/** @file
-		33	*/
-		34
29	#ifndef __SPINLOCK_H__	35	#ifndef __SPINLOCK_H__
30	#define __SPINLOCK_H__	36	#define __SPINLOCK_H__
31		37
32	#include <arch/types.h>	38	#include <arch/types.h>
33	#include <typedefs.h>	39	#include <typedefs.h>
34	#include <preemption.h>	40	#include <preemption.h>
35	#include <atomic.h>	41	#include <atomic.h>
36	#include <debug.h>	42	#include <debug.h>
37		43
38	#ifdef CONFIG_SMP	44	#ifdef CONFIG_SMP
39	struct spinlock {	45	struct spinlock {
40	#ifdef CONFIG_DEBUG_SPINLOCK	46	#ifdef CONFIG_DEBUG_SPINLOCK
41	char *name;	47	char *name;
42	#endif	48	#endif
43	atomic_t val;	49	atomic_t val;
44	};	50	};
45		51
46	/*	52	/*
47	* SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,	53	* SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,
48	* where the lock gets initialized in run time.	54	* where the lock gets initialized in run time.
49	*/	55	*/
50	#define SPINLOCK_DECLARE(slname) spinlock_t slname	56	#define SPINLOCK_DECLARE(slname) spinlock_t slname
51		57
52	/*	58	/*
53	* SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.	59	* SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.
54	* It declares and initializes the lock.	60	* It declares and initializes the lock.
55	*/	61	*/
56	#ifdef CONFIG_DEBUG_SPINLOCK	62	#ifdef CONFIG_DEBUG_SPINLOCK
57	#define SPINLOCK_INITIALIZE(slname) \	63	#define SPINLOCK_INITIALIZE(slname) \
58	spinlock_t slname = { \	64	spinlock_t slname = { \
59	.name = #slname, \	65	.name = #slname, \
60	.val = { 0 } \	66	.val = { 0 } \
61	}	67	}
62	#else	68	#else
63	#define SPINLOCK_INITIALIZE(slname) \	69	#define SPINLOCK_INITIALIZE(slname) \
64	spinlock_t slname = { \	70	spinlock_t slname = { \
65	.val = { 0 } \	71	.val = { 0 } \
66	}	72	}
67	#endif	73	#endif
68		74
69	extern void spinlock_initialize(spinlock_t sl, char name);	75	extern void spinlock_initialize(spinlock_t sl, char name);
70	extern int spinlock_trylock(spinlock_t *sl);	76	extern int spinlock_trylock(spinlock_t *sl);
71	extern void spinlock_lock_debug(spinlock_t *sl);	77	extern void spinlock_lock_debug(spinlock_t *sl);
72		78
73	#ifdef CONFIG_DEBUG_SPINLOCK	79	#ifdef CONFIG_DEBUG_SPINLOCK
74	# define spinlock_lock(x) spinlock_lock_debug(x)	80	# define spinlock_lock(x) spinlock_lock_debug(x)
75	#else	81	#else
76	# define spinlock_lock(x) atomic_lock_arch(&(x)->val)	82	# define spinlock_lock(x) atomic_lock_arch(&(x)->val)
77	#endif	83	#endif
78		84
79	/** Unlock spinlock	85	/** Unlock spinlock
80	*	86	*
81	* Unlock spinlock.	87	* Unlock spinlock.
82	*	88	*
83	* @param sl Pointer to spinlock_t structure.	89	* @param sl Pointer to spinlock_t structure.
84	*/	90	*/
85	static inline void spinlock_unlock(spinlock_t *sl)	91	static inline void spinlock_unlock(spinlock_t *sl)
86	{	92	{
87	ASSERT(atomic_get(&sl->val) != 0);	93	ASSERT(atomic_get(&sl->val) != 0);
88		94
89	/*	95	/*
90	* Prevent critical section code from bleeding out this way down.	96	* Prevent critical section code from bleeding out this way down.
91	*/	97	*/
92	CS_LEAVE_BARRIER();	98	CS_LEAVE_BARRIER();
93		99
94	atomic_set(&sl->val,0);	100	atomic_set(&sl->val,0);
95	preemption_enable();	101	preemption_enable();
96	}	102	}
97		103
98	#else	104	#else
99		105
100	/* On UP systems, spinlocks are effectively left out. */	106	/* On UP systems, spinlocks are effectively left out. */
101	#define SPINLOCK_DECLARE(name)	107	#define SPINLOCK_DECLARE(name)
102	#define SPINLOCK_INITIALIZE(name)	108	#define SPINLOCK_INITIALIZE(name)
103		109
104	#define spinlock_initialize(x,name)	110	#define spinlock_initialize(x,name)
105	#define spinlock_lock(x) preemption_disable()	111	#define spinlock_lock(x) preemption_disable()
106	#define spinlock_trylock(x) (preemption_disable(), 1)	112	#define spinlock_trylock(x) (preemption_disable(), 1)
107	#define spinlock_unlock(x) preemption_enable()	113	#define spinlock_unlock(x) preemption_enable()
108		114
109	#endif	115	#endif
110		116
111	#endif	117	#endif
-		118
-		119	/** @}
-		120	*/
-		121
112		122

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/generic/include/synch/spinlock.h – Rev 1104 → 1702