diff options
Diffstat (limited to 'include/linux/rwlock.h')
-rw-r--r-- | include/linux/rwlock.h | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/include/linux/rwlock.h b/include/linux/rwlock.h new file mode 100644 index 000000000000..71e0b00b6f2c --- /dev/null +++ b/include/linux/rwlock.h | |||
@@ -0,0 +1,125 @@ | |||
1 | #ifndef __LINUX_RWLOCK_H | ||
2 | #define __LINUX_RWLOCK_H | ||
3 | |||
4 | #ifndef __LINUX_SPINLOCK_H | ||
5 | # error "please don't include this file directly" | ||
6 | #endif | ||
7 | |||
8 | /* | ||
9 | * rwlock related methods | ||
10 | * | ||
11 | * split out from spinlock.h | ||
12 | * | ||
13 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar | ||
14 | * Released under the General Public License (GPL). | ||
15 | */ | ||
16 | |||
17 | #ifdef CONFIG_DEBUG_SPINLOCK | ||
18 | extern void __rwlock_init(rwlock_t *lock, const char *name, | ||
19 | struct lock_class_key *key); | ||
20 | # define rwlock_init(lock) \ | ||
21 | do { \ | ||
22 | static struct lock_class_key __key; \ | ||
23 | \ | ||
24 | __rwlock_init((lock), #lock, &__key); \ | ||
25 | } while (0) | ||
26 | #else | ||
27 | # define rwlock_init(lock) \ | ||
28 | do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0) | ||
29 | #endif | ||
30 | |||
31 | #ifdef CONFIG_DEBUG_SPINLOCK | ||
32 | extern void do_raw_read_lock(rwlock_t *lock); | ||
33 | #define do_raw_read_lock_flags(lock, flags) do_raw_read_lock(lock) | ||
34 | extern int do_raw_read_trylock(rwlock_t *lock); | ||
35 | extern void do_raw_read_unlock(rwlock_t *lock); | ||
36 | extern void do_raw_write_lock(rwlock_t *lock); | ||
37 | #define do_raw_write_lock_flags(lock, flags) do_raw_write_lock(lock) | ||
38 | extern int do_raw_write_trylock(rwlock_t *lock); | ||
39 | extern void do_raw_write_unlock(rwlock_t *lock); | ||
40 | #else | ||
41 | # define do_raw_read_lock(rwlock) arch_read_lock(&(rwlock)->raw_lock) | ||
42 | # define do_raw_read_lock_flags(lock, flags) \ | ||
43 | arch_read_lock_flags(&(lock)->raw_lock, *(flags)) | ||
44 | # define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock) | ||
45 | # define do_raw_read_unlock(rwlock) arch_read_unlock(&(rwlock)->raw_lock) | ||
46 | # define do_raw_write_lock(rwlock) arch_write_lock(&(rwlock)->raw_lock) | ||
47 | # define do_raw_write_lock_flags(lock, flags) \ | ||
48 | arch_write_lock_flags(&(lock)->raw_lock, *(flags)) | ||
49 | # define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock) | ||
50 | # define do_raw_write_unlock(rwlock) arch_write_unlock(&(rwlock)->raw_lock) | ||
51 | #endif | ||
52 | |||
53 | #define read_can_lock(rwlock) arch_read_can_lock(&(rwlock)->raw_lock) | ||
54 | #define write_can_lock(rwlock) arch_write_can_lock(&(rwlock)->raw_lock) | ||
55 | |||
56 | /* | ||
57 | * Define the various rw_lock methods. Note we define these | ||
58 | * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various | ||
59 | * methods are defined as nops in the case they are not required. | ||
60 | */ | ||
61 | #define read_trylock(lock) __cond_lock(lock, _raw_read_trylock(lock)) | ||
62 | #define write_trylock(lock) __cond_lock(lock, _raw_write_trylock(lock)) | ||
63 | |||
64 | #define write_lock(lock) _raw_write_lock(lock) | ||
65 | #define read_lock(lock) _raw_read_lock(lock) | ||
66 | |||
67 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) | ||
68 | |||
69 | #define read_lock_irqsave(lock, flags) \ | ||
70 | do { \ | ||
71 | typecheck(unsigned long, flags); \ | ||
72 | flags = _raw_read_lock_irqsave(lock); \ | ||
73 | } while (0) | ||
74 | #define write_lock_irqsave(lock, flags) \ | ||
75 | do { \ | ||
76 | typecheck(unsigned long, flags); \ | ||
77 | flags = _raw_write_lock_irqsave(lock); \ | ||
78 | } while (0) | ||
79 | |||
80 | #else | ||
81 | |||
82 | #define read_lock_irqsave(lock, flags) \ | ||
83 | do { \ | ||
84 | typecheck(unsigned long, flags); \ | ||
85 | _raw_read_lock_irqsave(lock, flags); \ | ||
86 | } while (0) | ||
87 | #define write_lock_irqsave(lock, flags) \ | ||
88 | do { \ | ||
89 | typecheck(unsigned long, flags); \ | ||
90 | _raw_write_lock_irqsave(lock, flags); \ | ||
91 | } while (0) | ||
92 | |||
93 | #endif | ||
94 | |||
95 | #define read_lock_irq(lock) _raw_read_lock_irq(lock) | ||
96 | #define read_lock_bh(lock) _raw_read_lock_bh(lock) | ||
97 | #define write_lock_irq(lock) _raw_write_lock_irq(lock) | ||
98 | #define write_lock_bh(lock) _raw_write_lock_bh(lock) | ||
99 | #define read_unlock(lock) _raw_read_unlock(lock) | ||
100 | #define write_unlock(lock) _raw_write_unlock(lock) | ||
101 | #define read_unlock_irq(lock) _raw_read_unlock_irq(lock) | ||
102 | #define write_unlock_irq(lock) _raw_write_unlock_irq(lock) | ||
103 | |||
104 | #define read_unlock_irqrestore(lock, flags) \ | ||
105 | do { \ | ||
106 | typecheck(unsigned long, flags); \ | ||
107 | _raw_read_unlock_irqrestore(lock, flags); \ | ||
108 | } while (0) | ||
109 | #define read_unlock_bh(lock) _raw_read_unlock_bh(lock) | ||
110 | |||
111 | #define write_unlock_irqrestore(lock, flags) \ | ||
112 | do { \ | ||
113 | typecheck(unsigned long, flags); \ | ||
114 | _raw_write_unlock_irqrestore(lock, flags); \ | ||
115 | } while (0) | ||
116 | #define write_unlock_bh(lock) _raw_write_unlock_bh(lock) | ||
117 | |||
118 | #define write_trylock_irqsave(lock, flags) \ | ||
119 | ({ \ | ||
120 | local_irq_save(flags); \ | ||
121 | write_trylock(lock) ? \ | ||
122 | 1 : ({ local_irq_restore(flags); 0; }); \ | ||
123 | }) | ||
124 | |||
125 | #endif /* __LINUX_RWLOCK_H */ | ||