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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 | #ifndef __SPINLOCK_H__ |
29 | #ifndef __SPINLOCK_H__ |
30 | #define __SPINLOCK_H__ |
30 | #define __SPINLOCK_H__ |
31 | 31 | ||
32 | #include <arch/types.h> |
32 | #include <arch/types.h> |
33 | #include <typedefs.h> |
33 | #include <typedefs.h> |
34 | #include <preemption.h> |
34 | #include <preemption.h> |
- | 35 | #include <arch/atomic.h> |
|
35 | 36 | ||
36 | #ifdef CONFIG_SMP |
37 | #ifdef CONFIG_SMP |
37 | struct spinlock { |
38 | struct spinlock { |
38 | #ifdef CONFIG_DEBUG_SPINLOCK |
39 | #ifdef CONFIG_DEBUG_SPINLOCK |
39 | char *name; |
40 | char *name; |
40 | #endif |
41 | #endif |
41 | int val; |
42 | atomic_t val; |
42 | }; |
43 | }; |
43 | 44 | ||
44 | /* |
45 | /* |
45 | * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
46 | * SPINLOCK_DECLARE is to be used for dynamically allocated spinlocks, |
46 | * where the lock gets initialized in run time. |
47 | * where the lock gets initialized in run time. |
47 | */ |
48 | */ |
48 | #define SPINLOCK_DECLARE(slname) spinlock_t slname |
49 | #define SPINLOCK_DECLARE(slname) spinlock_t slname |
49 | 50 | ||
50 | /* |
51 | /* |
51 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
52 | * SPINLOCK_INITIALIZE is to be used for statically allocated spinlocks. |
52 | * It declares and initializes the lock. |
53 | * It declares and initializes the lock. |
53 | */ |
54 | */ |
54 | #ifdef CONFIG_DEBUG_SPINLOCK |
55 | #ifdef CONFIG_DEBUG_SPINLOCK |
55 | #define SPINLOCK_INITIALIZE(slname) \ |
56 | #define SPINLOCK_INITIALIZE(slname) \ |
56 | spinlock_t slname = { \ |
57 | spinlock_t slname = { \ |
57 | .name = #slname, \ |
58 | .name = #slname, \ |
58 | .val = 0 \ |
59 | .val = { 0 } \ |
59 | } |
60 | } |
60 | #else |
61 | #else |
61 | #define SPINLOCK_INITIALIZE(slname) \ |
62 | #define SPINLOCK_INITIALIZE(slname) \ |
62 | spinlock_t slname = { \ |
63 | spinlock_t slname = { \ |
63 | .val = 0 \ |
64 | .val = { 0 } \ |
64 | } |
65 | } |
65 | #endif |
66 | #endif |
66 | 67 | ||
67 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
68 | extern void spinlock_initialize(spinlock_t *sl, char *name); |
68 | extern void spinlock_lock(spinlock_t *sl); |
69 | extern void spinlock_lock(spinlock_t *sl); |
69 | extern int spinlock_trylock(spinlock_t *sl); |
70 | extern int spinlock_trylock(spinlock_t *sl); |
70 | extern void spinlock_unlock(spinlock_t *sl); |
71 | extern void spinlock_unlock(spinlock_t *sl); |
71 | 72 | ||
72 | #else |
73 | #else |
73 | 74 | ||
74 | /* On UP systems, spinlocks are effectively left out. */ |
75 | /* On UP systems, spinlocks are effectively left out. */ |
75 | #define SPINLOCK_DECLARE(name) |
76 | #define SPINLOCK_DECLARE(name) |
76 | #define SPINLOCK_INITIALIZE(name) |
77 | #define SPINLOCK_INITIALIZE(name) |
77 | 78 | ||
78 | #define spinlock_initialize(x,name) |
79 | #define spinlock_initialize(x,name) |
79 | #define spinlock_lock(x) preemption_disable() |
80 | #define spinlock_lock(x) preemption_disable() |
80 | #define spinlock_trylock(x) (preemption_disable(), 1) |
81 | #define spinlock_trylock(x) (preemption_disable(), 1) |
81 | #define spinlock_unlock(x) preemption_enable() |
82 | #define spinlock_unlock(x) preemption_enable() |
82 | 83 | ||
83 | #endif |
84 | #endif |
84 | 85 | ||
85 | #endif |
86 | #endif |
86 | 87 |