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ef12f109 TG |
1 | #ifndef __LINUX_RWLOCK_H |
2 | #define __LINUX_RWLOCK_H | |
3 | ||
2747b93e | 4 | #ifndef __LINUX_INSIDE_SPINLOCK_H |
ef12f109 TG |
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 | |
b97c4bc1 | 32 | extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock); |
9828ea9d | 33 | extern int do_raw_read_trylock(rwlock_t *lock); |
b97c4bc1 LB |
34 | extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock); |
35 | extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock); | |
9828ea9d | 36 | extern int do_raw_write_trylock(rwlock_t *lock); |
b97c4bc1 | 37 | extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock); |
ef12f109 | 38 | #else |
b97c4bc1 | 39 | # define do_raw_read_lock(rwlock) do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0) |
9828ea9d | 40 | # define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock) |
b97c4bc1 LB |
41 | # define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) |
42 | # define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0) | |
9828ea9d | 43 | # define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock) |
b97c4bc1 | 44 | # define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) |
ef12f109 TG |
45 | #endif |
46 | ||
ef12f109 TG |
47 | /* |
48 | * Define the various rw_lock methods. Note we define these | |
49 | * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various | |
50 | * methods are defined as nops in the case they are not required. | |
51 | */ | |
9c1721aa TG |
52 | #define read_trylock(lock) __cond_lock(lock, _raw_read_trylock(lock)) |
53 | #define write_trylock(lock) __cond_lock(lock, _raw_write_trylock(lock)) | |
ef12f109 | 54 | |
9c1721aa TG |
55 | #define write_lock(lock) _raw_write_lock(lock) |
56 | #define read_lock(lock) _raw_read_lock(lock) | |
ef12f109 | 57 | |
4a57d6bb MK |
58 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
59 | #define write_lock_nested(lock, subclass) _raw_write_lock_nested(lock, subclass) | |
60 | #else | |
61 | #define write_lock_nested(lock, subclass) _raw_write_lock(lock) | |
62 | #endif | |
63 | ||
ef12f109 TG |
64 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) |
65 | ||
66 | #define read_lock_irqsave(lock, flags) \ | |
67 | do { \ | |
68 | typecheck(unsigned long, flags); \ | |
9c1721aa | 69 | flags = _raw_read_lock_irqsave(lock); \ |
ef12f109 TG |
70 | } while (0) |
71 | #define write_lock_irqsave(lock, flags) \ | |
72 | do { \ | |
73 | typecheck(unsigned long, flags); \ | |
9c1721aa | 74 | flags = _raw_write_lock_irqsave(lock); \ |
ef12f109 TG |
75 | } while (0) |
76 | ||
77 | #else | |
78 | ||
79 | #define read_lock_irqsave(lock, flags) \ | |
80 | do { \ | |
81 | typecheck(unsigned long, flags); \ | |
9c1721aa | 82 | _raw_read_lock_irqsave(lock, flags); \ |
ef12f109 TG |
83 | } while (0) |
84 | #define write_lock_irqsave(lock, flags) \ | |
85 | do { \ | |
86 | typecheck(unsigned long, flags); \ | |
9c1721aa | 87 | _raw_write_lock_irqsave(lock, flags); \ |
ef12f109 TG |
88 | } while (0) |
89 | ||
90 | #endif | |
91 | ||
9c1721aa TG |
92 | #define read_lock_irq(lock) _raw_read_lock_irq(lock) |
93 | #define read_lock_bh(lock) _raw_read_lock_bh(lock) | |
94 | #define write_lock_irq(lock) _raw_write_lock_irq(lock) | |
95 | #define write_lock_bh(lock) _raw_write_lock_bh(lock) | |
96 | #define read_unlock(lock) _raw_read_unlock(lock) | |
97 | #define write_unlock(lock) _raw_write_unlock(lock) | |
98 | #define read_unlock_irq(lock) _raw_read_unlock_irq(lock) | |
99 | #define write_unlock_irq(lock) _raw_write_unlock_irq(lock) | |
100 | ||
101 | #define read_unlock_irqrestore(lock, flags) \ | |
102 | do { \ | |
103 | typecheck(unsigned long, flags); \ | |
104 | _raw_read_unlock_irqrestore(lock, flags); \ | |
ef12f109 | 105 | } while (0) |
9c1721aa | 106 | #define read_unlock_bh(lock) _raw_read_unlock_bh(lock) |
ef12f109 TG |
107 | |
108 | #define write_unlock_irqrestore(lock, flags) \ | |
109 | do { \ | |
110 | typecheck(unsigned long, flags); \ | |
9c1721aa | 111 | _raw_write_unlock_irqrestore(lock, flags); \ |
ef12f109 | 112 | } while (0) |
9c1721aa | 113 | #define write_unlock_bh(lock) _raw_write_unlock_bh(lock) |
ef12f109 TG |
114 | |
115 | #define write_trylock_irqsave(lock, flags) \ | |
116 | ({ \ | |
117 | local_irq_save(flags); \ | |
118 | write_trylock(lock) ? \ | |
119 | 1 : ({ local_irq_restore(flags); 0; }); \ | |
120 | }) | |
121 | ||
26128cb6 BG |
122 | #ifdef arch_rwlock_is_contended |
123 | #define rwlock_is_contended(lock) \ | |
124 | arch_rwlock_is_contended(&(lock)->raw_lock) | |
125 | #else | |
126 | #define rwlock_is_contended(lock) ((void)(lock), 0) | |
127 | #endif /* arch_rwlock_is_contended */ | |
128 | ||
ef12f109 | 129 | #endif /* __LINUX_RWLOCK_H */ |