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 */
11typedef struct {
12 arch_rwlock_t raw_lock;
13#ifdef CONFIG_DEBUG_SPINLOCK
14 unsigned int magic, owner_cpu;
15 void *owner;
16#endif
17#ifdef CONFIG_DEBUG_LOCK_ALLOC
18 struct lockdep_map dep_map;
19#endif
20} rwlock_t;
21
22#define RWLOCK_MAGIC 0xdeaf1eed
23
24#ifdef CONFIG_DEBUG_LOCK_ALLOC
25# define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
26#else
27# define RW_DEP_MAP_INIT(lockname)
28#endif
29
30#ifdef CONFIG_DEBUG_SPINLOCK
31#define __RW_LOCK_UNLOCKED(lockname) \
32 (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \
33 .magic = RWLOCK_MAGIC, \
34 .owner = SPINLOCK_OWNER_INIT, \
35 .owner_cpu = -1, \
36 RW_DEP_MAP_INIT(lockname) }
37#else
38#define __RW_LOCK_UNLOCKED(lockname) \
39 (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \
40 RW_DEP_MAP_INIT(lockname) }
41#endif
42
43#define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x)
44
45#endif /* __LINUX_RWLOCK_TYPES_H */
46