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 | |
42 | #ifndef arch_read_lock_flags |
43 | # define arch_read_lock_flags(lock, flags) arch_read_lock(lock) |
44 | #endif |
45 | |
46 | #ifndef arch_write_lock_flags |
47 | # define arch_write_lock_flags(lock, flags) arch_write_lock(lock) |
48 | #endif |
49 | |
50 | # define do_raw_read_lock(rwlock) do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0) |
51 | # define do_raw_read_lock_flags(lock, flags) \ |
52 | do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0) |
53 | # define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock) |
54 | # define do_raw_read_unlock(rwlock) do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) |
55 | # define do_raw_write_lock(rwlock) do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0) |
56 | # define do_raw_write_lock_flags(lock, flags) \ |
57 | do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0) |
58 | # define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock) |
59 | # define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0) |
60 | #endif |
61 | |
62 | /* |
63 | * Define the various rw_lock methods. Note we define these |
64 | * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various |
65 | * methods are defined as nops in the case they are not required. |
66 | */ |
67 | #define read_trylock(lock) __cond_lock(lock, _raw_read_trylock(lock)) |
68 | #define write_trylock(lock) __cond_lock(lock, _raw_write_trylock(lock)) |
69 | |
70 | #define write_lock(lock) _raw_write_lock(lock) |
71 | #define read_lock(lock) _raw_read_lock(lock) |
72 | |
73 | #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK) |
74 | |
75 | #define read_lock_irqsave(lock, flags) \ |
76 | do { \ |
77 | typecheck(unsigned long, flags); \ |
78 | flags = _raw_read_lock_irqsave(lock); \ |
79 | } while (0) |
80 | #define write_lock_irqsave(lock, flags) \ |
81 | do { \ |
82 | typecheck(unsigned long, flags); \ |
83 | flags = _raw_write_lock_irqsave(lock); \ |
84 | } while (0) |
85 | |
86 | #else |
87 | |
88 | #define read_lock_irqsave(lock, flags) \ |
89 | do { \ |
90 | typecheck(unsigned long, flags); \ |
91 | _raw_read_lock_irqsave(lock, flags); \ |
92 | } while (0) |
93 | #define write_lock_irqsave(lock, flags) \ |
94 | do { \ |
95 | typecheck(unsigned long, flags); \ |
96 | _raw_write_lock_irqsave(lock, flags); \ |
97 | } while (0) |
98 | |
99 | #endif |
100 | |
101 | #define read_lock_irq(lock) _raw_read_lock_irq(lock) |
102 | #define read_lock_bh(lock) _raw_read_lock_bh(lock) |
103 | #define write_lock_irq(lock) _raw_write_lock_irq(lock) |
104 | #define write_lock_bh(lock) _raw_write_lock_bh(lock) |
105 | #define read_unlock(lock) _raw_read_unlock(lock) |
106 | #define write_unlock(lock) _raw_write_unlock(lock) |
107 | #define read_unlock_irq(lock) _raw_read_unlock_irq(lock) |
108 | #define write_unlock_irq(lock) _raw_write_unlock_irq(lock) |
109 | |
110 | #define read_unlock_irqrestore(lock, flags) \ |
111 | do { \ |
112 | typecheck(unsigned long, flags); \ |
113 | _raw_read_unlock_irqrestore(lock, flags); \ |
114 | } while (0) |
115 | #define read_unlock_bh(lock) _raw_read_unlock_bh(lock) |
116 | |
117 | #define write_unlock_irqrestore(lock, flags) \ |
118 | do { \ |
119 | typecheck(unsigned long, flags); \ |
120 | _raw_write_unlock_irqrestore(lock, flags); \ |
121 | } while (0) |
122 | #define write_unlock_bh(lock) _raw_write_unlock_bh(lock) |
123 | |
124 | #define write_trylock_irqsave(lock, flags) \ |
125 | ({ \ |
126 | local_irq_save(flags); \ |
127 | write_trylock(lock) ? \ |
128 | 1 : ({ local_irq_restore(flags); 0; }); \ |
129 | }) |
130 | |
131 | #endif /* __LINUX_RWLOCK_H */ |
132 | |