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1 | #ifndef __LINUX_RWLOCK_TYPES_H |
2 | #define __LINUX_RWLOCK_TYPES_H |
3 | |
4 | /* |
5 | * include/linux/rwlock_types.h - generic rwlock type definitions |
6 | * and initializers |
7 | * |
8 | * portions Copyright 2005, Red Hat, Inc., Ingo Molnar |
9 | * Released under the General Public License (GPL). |
10 | */ |
11 | typedef struct { |
12 | arch_rwlock_t raw_lock; |
13 | #ifdef CONFIG_GENERIC_LOCKBREAK |
14 | unsigned int break_lock; |
15 | #endif |
16 | #ifdef CONFIG_DEBUG_SPINLOCK |
17 | unsigned int magic, owner_cpu; |
18 | void *owner; |
19 | #endif |
20 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
21 | struct lockdep_map dep_map; |
22 | #endif |
23 | } rwlock_t; |
24 | |
25 | #define RWLOCK_MAGIC 0xdeaf1eed |
26 | |
27 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
28 | # define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname } |
29 | #else |
30 | # define RW_DEP_MAP_INIT(lockname) |
31 | #endif |
32 | |
33 | #ifdef CONFIG_DEBUG_SPINLOCK |
34 | #define __RW_LOCK_UNLOCKED(lockname) \ |
35 | (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \ |
36 | .magic = RWLOCK_MAGIC, \ |
37 | .owner = SPINLOCK_OWNER_INIT, \ |
38 | .owner_cpu = -1, \ |
39 | RW_DEP_MAP_INIT(lockname) } |
40 | #else |
41 | #define __RW_LOCK_UNLOCKED(lockname) \ |
42 | (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \ |
43 | RW_DEP_MAP_INIT(lockname) } |
44 | #endif |
45 | |
46 | /* |
47 | * RW_LOCK_UNLOCKED defeat lockdep state tracking and is hence |
48 | * deprecated. |
49 | * |
50 | * Please use DEFINE_RWLOCK() or __RW_LOCK_UNLOCKED() as appropriate. |
51 | */ |
52 | #define RW_LOCK_UNLOCKED __RW_LOCK_UNLOCKED(old_style_rw_init) |
53 | |
54 | #define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x) |
55 | |
56 | #endif /* __LINUX_RWLOCK_TYPES_H */ |
57 |
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