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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) __acquires(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) __releases(lock); | |
36 | extern void do_raw_write_lock(rwlock_t *lock) __acquires(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) __releases(lock); | |
40 | #else | |
41 | # define do_raw_read_lock(rwlock) do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0) | |
42 | # define do_raw_read_lock_flags(lock, flags) \ | |
43 | do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0) | |
44 | # define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock) | |
45 | # define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) | |
46 | # define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0) | |
47 | # define do_raw_write_lock_flags(lock, flags) \ | |
48 | do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0) | |
49 | # define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock) | |
50 | # define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) | |
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 */ |