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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 <typedefs.h> |
39 | #include <typedefs.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 | struct spinlock { |
45 | struct spinlock { |
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 | }; |
50 | }; |
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 | 57 | ||
58 | /* |
58 | /* |
59 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
59 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
60 | * It declares and initializes the lock. |
60 | * It declares and initializes the lock. |
61 | */ |
61 | */ |
62 | #ifdef CONFIG_DEBUG_SPINLOCK |
62 | #ifdef CONFIG_DEBUG_SPINLOCK |
63 | #define SPINLOCK_INITIALIZE(slname) \ |
63 | #define SPINLOCK_INITIALIZE(slname) \ |
64 | spinlock_t slname = { \ |
64 | spinlock_t slname = { \ |
65 | .name = #slname, \ |
65 | .name = #slname, \ |
66 | .val = { 0 } \ |
66 | .val = { 0 } \ |
67 | } |
67 | } |
68 | #else |
68 | #else |
69 | #define SPINLOCK_INITIALIZE(slname) \ |
69 | #define SPINLOCK_INITIALIZE(slname) \ |
70 | spinlock_t slname = { \ |
70 | spinlock_t slname = { \ |
71 | .val = { 0 } \ |
71 | .val = { 0 } \ |
72 | } |
72 | } |
73 | #endif |
73 | #endif |
74 | 74 | ||
75 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
75 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
76 | extern int spinlock_trylock(spinlock_t *sl); |
76 | extern int spinlock_trylock(spinlock_t *sl); |
77 | extern void spinlock_lock_debug(spinlock_t *sl); |
77 | extern void spinlock_lock_debug(spinlock_t *sl); |
78 | 78 | ||
79 | #ifdef CONFIG_DEBUG_SPINLOCK |
79 | #ifdef CONFIG_DEBUG_SPINLOCK |
80 | # define spinlock_lock(x) spinlock_lock_debug(x) |
80 | # define spinlock_lock(x) spinlock_lock_debug(x) |
81 | #else |
81 | #else |
82 | # define spinlock_lock(x) atomic_lock_arch(&(x)->val) |
82 | # define spinlock_lock(x) atomic_lock_arch(&(x)->val) |
83 | #endif |
83 | #endif |
84 | 84 | ||
85 | /** Unlock spinlock |
85 | /** Unlock spinlock |
86 | * |
86 | * |
87 | * Unlock spinlock. |
87 | * Unlock spinlock. |
88 | * |
88 | * |
89 | * @param sl Pointer to spinlock_t structure. |
89 | * @param sl Pointer to spinlock_t structure. |
90 | */ |
90 | */ |
91 | static inline void spinlock_unlock(spinlock_t *sl) |
91 | static inline void spinlock_unlock(spinlock_t *sl) |
92 | { |
92 | { |
93 | ASSERT(atomic_get(&sl->val) != 0); |
93 | ASSERT(atomic_get(&sl->val) != 0); |
94 | 94 | ||
95 | /* |
95 | /* |
96 | * Prevent critical section code from bleeding out this way down. |
96 | * Prevent critical section code from bleeding out this way down. |
97 | */ |
97 | */ |
98 | CS_LEAVE_BARRIER(); |
98 | CS_LEAVE_BARRIER(); |
99 | 99 | ||
100 | atomic_set(&sl->val,0); |
100 | atomic_set(&sl->val,0); |
101 | preemption_enable(); |
101 | preemption_enable(); |
102 | } |
102 | } |
103 | 103 | ||
104 | #else |
104 | #else |
105 | 105 | ||
106 | /* On UP systems, spinlocks are effectively left out. */ |
106 | /* On UP systems, spinlocks are effectively left out. */ |
107 | #define SPINLOCK_DECLARE(name) |
107 | #define SPINLOCK_DECLARE(name) |
108 | #define SPINLOCK_INITIALIZE(name) |
108 | #define SPINLOCK_INITIALIZE(name) |
109 | 109 | ||
110 | #define spinlock_initialize(x,name) |
110 | #define spinlock_initialize(x,name) |
111 | #define spinlock_lock(x) preemption_disable() |
111 | #define spinlock_lock(x) preemption_disable() |
112 | #define spinlock_trylock(x) (preemption_disable(), 1) |
112 | #define spinlock_trylock(x) (preemption_disable(), 1) |
113 | #define spinlock_unlock(x) preemption_enable() |
113 | #define spinlock_unlock(x) preemption_enable() |
114 | 114 | ||
115 | #endif |
115 | #endif |
116 | 116 | ||
117 | #endif |
117 | #endif |
118 | 118 | ||
119 | /** @} |
119 | /** @} |
120 | */ |
120 | */ |
121 | 121 |