1 #ifndef __LINUX_RWLOCK_H 1 #ifndef __LINUX_RWLOCK_H
2 #define __LINUX_RWLOCK_H 2 #define __LINUX_RWLOCK_H
3 3
4 #ifndef __LINUX_INSIDE_SPINLOCK_H !! 4 #ifndef __LINUX_SPINLOCK_H
5 # error "please don't include this file direct 5 # error "please don't include this file directly"
6 #endif 6 #endif
7 7
8 /* 8 /*
9 * rwlock related methods 9 * rwlock related methods
10 * 10 *
11 * split out from spinlock.h 11 * split out from spinlock.h
12 * 12 *
13 * portions Copyright 2005, Red Hat, Inc., Ing 13 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
14 * Released under the General Public License ( 14 * Released under the General Public License (GPL).
15 */ 15 */
16 16
17 #ifdef CONFIG_DEBUG_SPINLOCK 17 #ifdef CONFIG_DEBUG_SPINLOCK
18 extern void __rwlock_init(rwlock_t *lock, co 18 extern void __rwlock_init(rwlock_t *lock, const char *name,
19 struct lock_class_ 19 struct lock_class_key *key);
20 # define rwlock_init(lock) 20 # define rwlock_init(lock) \
21 do { 21 do { \
22 static struct lock_class_key __key; 22 static struct lock_class_key __key; \
23 23 \
24 __rwlock_init((lock), #lock, &__key); 24 __rwlock_init((lock), #lock, &__key); \
25 } while (0) 25 } while (0)
26 #else 26 #else
27 # define rwlock_init(lock) 27 # define rwlock_init(lock) \
28 do { *(lock) = __RW_LOCK_UNLOCKED(lock 28 do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
29 #endif 29 #endif
30 30
31 #ifdef CONFIG_DEBUG_SPINLOCK 31 #ifdef CONFIG_DEBUG_SPINLOCK
32 extern void do_raw_read_lock(rwlock_t *lock) 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)
33 extern int do_raw_read_trylock(rwlock_t *lock 34 extern int do_raw_read_trylock(rwlock_t *lock);
34 extern void do_raw_read_unlock(rwlock_t *lock 35 extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);
35 extern void do_raw_write_lock(rwlock_t *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)
36 extern int do_raw_write_trylock(rwlock_t *loc 38 extern int do_raw_write_trylock(rwlock_t *lock);
37 extern void do_raw_write_unlock(rwlock_t *loc 39 extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
38 #else 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
39 # define do_raw_read_lock(rwlock) do {__ 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)
40 # define do_raw_read_trylock(rwlock) arch_r 53 # define do_raw_read_trylock(rwlock) arch_read_trylock(&(rwlock)->raw_lock)
41 # define do_raw_read_unlock(rwlock) do {ar 54 # 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 {__ 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)
43 # define do_raw_write_trylock(rwlock) arch_w 58 # define do_raw_write_trylock(rwlock) arch_write_trylock(&(rwlock)->raw_lock)
44 # define do_raw_write_unlock(rwlock) do {ar 59 # define do_raw_write_unlock(rwlock) do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
45 #endif 60 #endif
46 61
47 /* 62 /*
48 * Define the various rw_lock methods. Note w 63 * Define the various rw_lock methods. Note we define these
49 * regardless of whether CONFIG_SMP or CONFIG_ 64 * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
50 * methods are defined as nops in the case the 65 * methods are defined as nops in the case they are not required.
51 */ 66 */
52 #define read_trylock(lock) __cond_lock(lo 67 #define read_trylock(lock) __cond_lock(lock, _raw_read_trylock(lock))
53 #define write_trylock(lock) __cond_lock(lo 68 #define write_trylock(lock) __cond_lock(lock, _raw_write_trylock(lock))
54 69
55 #define write_lock(lock) _raw_write_loc 70 #define write_lock(lock) _raw_write_lock(lock)
56 #define read_lock(lock) _raw_read_lock 71 #define read_lock(lock) _raw_read_lock(lock)
57 72
58 #ifdef CONFIG_DEBUG_LOCK_ALLOC <<
59 #define write_lock_nested(lock, subclass) <<
60 #else <<
61 #define write_lock_nested(lock, subclass) <<
62 #endif <<
63 <<
64 #if defined(CONFIG_SMP) || defined(CONFIG_DEBU 73 #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
65 74
66 #define read_lock_irqsave(lock, flags) 75 #define read_lock_irqsave(lock, flags) \
67 do { 76 do { \
68 typecheck(unsigned long, flags 77 typecheck(unsigned long, flags); \
69 flags = _raw_read_lock_irqsave 78 flags = _raw_read_lock_irqsave(lock); \
70 } while (0) 79 } while (0)
71 #define write_lock_irqsave(lock, flags) 80 #define write_lock_irqsave(lock, flags) \
72 do { 81 do { \
73 typecheck(unsigned long, flags 82 typecheck(unsigned long, flags); \
74 flags = _raw_write_lock_irqsav 83 flags = _raw_write_lock_irqsave(lock); \
75 } while (0) 84 } while (0)
76 85
77 #else 86 #else
78 87
79 #define read_lock_irqsave(lock, flags) 88 #define read_lock_irqsave(lock, flags) \
80 do { 89 do { \
81 typecheck(unsigned long, flags 90 typecheck(unsigned long, flags); \
82 _raw_read_lock_irqsave(lock, f 91 _raw_read_lock_irqsave(lock, flags); \
83 } while (0) 92 } while (0)
84 #define write_lock_irqsave(lock, flags) 93 #define write_lock_irqsave(lock, flags) \
85 do { 94 do { \
86 typecheck(unsigned long, flags 95 typecheck(unsigned long, flags); \
87 _raw_write_lock_irqsave(lock, 96 _raw_write_lock_irqsave(lock, flags); \
88 } while (0) 97 } while (0)
89 98
90 #endif 99 #endif
91 100
92 #define read_lock_irq(lock) _raw_r 101 #define read_lock_irq(lock) _raw_read_lock_irq(lock)
93 #define read_lock_bh(lock) _raw_r 102 #define read_lock_bh(lock) _raw_read_lock_bh(lock)
94 #define write_lock_irq(lock) _raw_w 103 #define write_lock_irq(lock) _raw_write_lock_irq(lock)
95 #define write_lock_bh(lock) _raw_w 104 #define write_lock_bh(lock) _raw_write_lock_bh(lock)
96 #define read_unlock(lock) _raw_r 105 #define read_unlock(lock) _raw_read_unlock(lock)
97 #define write_unlock(lock) _raw_w 106 #define write_unlock(lock) _raw_write_unlock(lock)
98 #define read_unlock_irq(lock) _raw_r 107 #define read_unlock_irq(lock) _raw_read_unlock_irq(lock)
99 #define write_unlock_irq(lock) _raw_w 108 #define write_unlock_irq(lock) _raw_write_unlock_irq(lock)
100 109
101 #define read_unlock_irqrestore(lock, flags) 110 #define read_unlock_irqrestore(lock, flags) \
102 do { 111 do { \
103 typecheck(unsigned long, flags 112 typecheck(unsigned long, flags); \
104 _raw_read_unlock_irqrestore(lo 113 _raw_read_unlock_irqrestore(lock, flags); \
105 } while (0) 114 } while (0)
106 #define read_unlock_bh(lock) _raw_r 115 #define read_unlock_bh(lock) _raw_read_unlock_bh(lock)
107 116
108 #define write_unlock_irqrestore(lock, flags) 117 #define write_unlock_irqrestore(lock, flags) \
109 do { 118 do { \
110 typecheck(unsigned long, flags 119 typecheck(unsigned long, flags); \
111 _raw_write_unlock_irqrestore(l 120 _raw_write_unlock_irqrestore(lock, flags); \
112 } while (0) 121 } while (0)
113 #define write_unlock_bh(lock) _raw_w 122 #define write_unlock_bh(lock) _raw_write_unlock_bh(lock)
114 123
115 #define write_trylock_irqsave(lock, flags) \ 124 #define write_trylock_irqsave(lock, flags) \
116 ({ \ 125 ({ \
117 local_irq_save(flags); \ 126 local_irq_save(flags); \
118 write_trylock(lock) ? \ 127 write_trylock(lock) ? \
119 1 : ({ local_irq_restore(flags); 0; }) 128 1 : ({ local_irq_restore(flags); 0; }); \
120 }) 129 })
121 <<
122 #ifdef arch_rwlock_is_contended <<
123 #define rwlock_is_contended(lock) \ <<
124 arch_rwlock_is_contended(&(lock)->raw <<
125 #else <<
126 #define rwlock_is_contended(lock) ((void <<
127 #endif /* arch_rwlock_is_contended */ <<
128 130
129 #endif /* __LINUX_RWLOCK_H */ 131 #endif /* __LINUX_RWLOCK_H */
130 132
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