WebSVN – HelenOS – Diff – /trunk/kernel/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 KERN_SPINLOCK_H_
#define KERN_SPINLOCK_H_
 
#include <arch/types.h>
#include <arch/barrier.h>
#include <preemption.h>
#include <atomic.h>
#include <debug.h>
 
#ifdef CONFIG_SMP
typedef struct {
#ifdef CONFIG_DEBUG_SPINLOCK
    char *name;
#endif
    atomic_t val;
} spinlock_t;
 
/*
 * 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
#define SPINLOCK_EXTERN(slname)     extern 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();
}
 
#ifdef CONFIG_DEBUG_SPINLOCK
 
extern int printf(const char *, ...);
 
#define DEADLOCK_THRESHOLD      100000000
#define DEADLOCK_PROBE_INIT(pname)  size_t pname = 0
#define DEADLOCK_PROBE(pname, value)                    \
    if ((pname)++ > (value)) {                  \
        (pname) = 0;                        \
        printf("Deadlock probe %s: exceeded threshold %u\n",    \
            "cpu%u: function=%s, line=%u\n",            \
            #pname, (value), CPU->id, __func__, __LINE__);  \
    }
#else
#define DEADLOCK_PROBE_INIT(pname)
#define DEADLOCK_PROBE(pname, value)
#endif
 
#else
 
/* On UP systems, spinlocks are effectively left out. */
#define SPINLOCK_DECLARE(name)
#define SPINLOCK_EXTERN(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()
 
#define DEADLOCK_PROBE_INIT(pname)
#define DEADLOCK_PROBE(pname, value)
 
#endif
 
#endif
 
/** @}
 */
 

Rev 3578	Rev 4490
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_SPINLOCK_H_	35	#ifndef KERN_SPINLOCK_H_
36	#define KERN_SPINLOCK_H_	36	#define KERN_SPINLOCK_H_
37		37
38	#include <arch/types.h>	38	#include <arch/types.h>
39	#include <arch/barrier.h>	39	#include <arch/barrier.h>
40	#include <preemption.h>	40	#include <preemption.h>
41	#include <atomic.h>	41	#include <atomic.h>
42	#include <debug.h>	42	#include <debug.h>
43		43
44	#ifdef CONFIG_SMP	44	#ifdef CONFIG_SMP
45	typedef struct {	45	typedef struct {
46	#ifdef CONFIG_DEBUG_SPINLOCK	46	#ifdef CONFIG_DEBUG_SPINLOCK
47	char *name;	47	char *name;
48	#endif	48	#endif
49	atomic_t val;	49	atomic_t val;
50	} spinlock_t;	50	} spinlock_t;
51		51
52	/*	52	/*
53	* SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,	53	* SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks,
54	* where the lock gets initialized in run time.	54	* where the lock gets initialized in run time.
55	*/	55	*/
56	#define SPINLOCK_DECLARE(slname) spinlock_t slname	56	#define SPINLOCK_DECLARE(slname) spinlock_t slname
57	#define SPINLOCK_EXTERN(slname) extern spinlock_t slname	57	#define SPINLOCK_EXTERN(slname) extern spinlock_t slname
58		58
59	/*	59	/*
60	* SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.	60	* SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks.
61	* It declares and initializes the lock.	61	* It declares and initializes the lock.
62	*/	62	*/
63	#ifdef CONFIG_DEBUG_SPINLOCK	63	#ifdef CONFIG_DEBUG_SPINLOCK
64	#define SPINLOCK_INITIALIZE(slname) \	64	#define SPINLOCK_INITIALIZE(slname) \
65	spinlock_t slname = { \	65	spinlock_t slname = { \
66	.name = #slname, \	66	.name = #slname, \
67	.val = { 0 } \	67	.val = { 0 } \
68	}	68	}
69	#else	69	#else
70	#define SPINLOCK_INITIALIZE(slname) \	70	#define SPINLOCK_INITIALIZE(slname) \
71	spinlock_t slname = { \	71	spinlock_t slname = { \
72	.val = { 0 } \	72	.val = { 0 } \
73	}	73	}
74	#endif	74	#endif
75		75
76	extern void spinlock_initialize(spinlock_t sl, char name);	76	extern void spinlock_initialize(spinlock_t sl, char name);
77	extern int spinlock_trylock(spinlock_t *sl);	77	extern int spinlock_trylock(spinlock_t *sl);
78	extern void spinlock_lock_debug(spinlock_t *sl);	78	extern void spinlock_lock_debug(spinlock_t *sl);
79		79
80	#ifdef CONFIG_DEBUG_SPINLOCK	80	#ifdef CONFIG_DEBUG_SPINLOCK
81	# define spinlock_lock(x) spinlock_lock_debug(x)	81	# define spinlock_lock(x) spinlock_lock_debug(x)
82	#else	82	#else
83	# define spinlock_lock(x) atomic_lock_arch(&(x)->val)	83	# define spinlock_lock(x) atomic_lock_arch(&(x)->val)
84	#endif	84	#endif
85		85
86	/** Unlock spinlock	86	/** Unlock spinlock
87	*	87	*
88	* Unlock spinlock.	88	* Unlock spinlock.
89	*	89	*
90	* @param sl Pointer to spinlock_t structure.	90	* @param sl Pointer to spinlock_t structure.
91	*/	91	*/
92	static inline void spinlock_unlock(spinlock_t *sl)	92	static inline void spinlock_unlock(spinlock_t *sl)
93	{	93	{
94	ASSERT(atomic_get(&sl->val) != 0);	94	ASSERT(atomic_get(&sl->val) != 0);
95		95
96	/*	96	/*
97	* Prevent critical section code from bleeding out this way down.	97	* Prevent critical section code from bleeding out this way down.
98	*/	98	*/
99	CS_LEAVE_BARRIER();	99	CS_LEAVE_BARRIER();
100		100
101	atomic_set(&sl->val, 0);	101	atomic_set(&sl->val, 0);
102	preemption_enable();	102	preemption_enable();
103	}	103	}
104		104
105	#ifdef CONFIG_DEBUG_SPINLOCK	105	#ifdef CONFIG_DEBUG_SPINLOCK
106		106
107	extern int printf(const char *, ...);	107	extern int printf(const char *, ...);
108		108
109	#define DEADLOCK_THRESHOLD 100000000	109	#define DEADLOCK_THRESHOLD 100000000
110	#define DEADLOCK_PROBE_INIT(pname) count_t pname = 0	110	#define DEADLOCK_PROBE_INIT(pname) size_t pname = 0
111	#define DEADLOCK_PROBE(pname, value) \	111	#define DEADLOCK_PROBE(pname, value) \
112	if ((pname)++ > (value)) { \	112	if ((pname)++ > (value)) { \
113	(pname) = 0; \	113	(pname) = 0; \
114	printf("Deadlock probe %s: exceeded threshold %u\n", \	114	printf("Deadlock probe %s: exceeded threshold %u\n", \
115	"cpu%u: function=%s, line=%u\n", \	115	"cpu%u: function=%s, line=%u\n", \
116	#pname, (value), CPU->id, __func__, __LINE__); \	116	#pname, (value), CPU->id, __func__, __LINE__); \
117	}	117	}
118	#else	118	#else
119	#define DEADLOCK_PROBE_INIT(pname)	119	#define DEADLOCK_PROBE_INIT(pname)
120	#define DEADLOCK_PROBE(pname, value)	120	#define DEADLOCK_PROBE(pname, value)
121	#endif	121	#endif
122		122
123	#else	123	#else
124		124
125	/* On UP systems, spinlocks are effectively left out. */	125	/* On UP systems, spinlocks are effectively left out. */
126	#define SPINLOCK_DECLARE(name)	126	#define SPINLOCK_DECLARE(name)
127	#define SPINLOCK_EXTERN(name)	127	#define SPINLOCK_EXTERN(name)
128	#define SPINLOCK_INITIALIZE(name)	128	#define SPINLOCK_INITIALIZE(name)
129		129
130	#define spinlock_initialize(x, name)	130	#define spinlock_initialize(x, name)
131	#define spinlock_lock(x) preemption_disable()	131	#define spinlock_lock(x) preemption_disable()
132	#define spinlock_trylock(x) (preemption_disable(), 1)	132	#define spinlock_trylock(x) (preemption_disable(), 1)
133	#define spinlock_unlock(x) preemption_enable()	133	#define spinlock_unlock(x) preemption_enable()
134		134
135	#define DEADLOCK_PROBE_INIT(pname)	135	#define DEADLOCK_PROBE_INIT(pname)
136	#define DEADLOCK_PROBE(pname, value)	136	#define DEADLOCK_PROBE(pname, value)
137		137
138	#endif	138	#endif
139		139
140	#endif	140	#endif
141		141
142	/** @}	142	/** @}
143	*/	143	*/
144		144

Subversion Repositories HelenOS

(root)/trunk/kernel/generic/include/synch/spinlock.h @ 2773 – Rev 3578 → 4490