1 #ifndef __LINUX_RWLOCK_TYPES_H
2 #define __LINUX_RWLOCK_TYPES_H
4 #if !defined(__LINUX_SPINLOCK_TYPES_H)
5 # error "Do not include directly, include spinlock_types.h"
9 * include/linux/rwlock_types.h - generic rwlock type definitions
12 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
13 * Released under the General Public License (GPL).
16 arch_rwlock_t raw_lock;
17 #ifdef CONFIG_GENERIC_LOCKBREAK
18 unsigned int break_lock;
20 #ifdef CONFIG_DEBUG_SPINLOCK
21 unsigned int magic, owner_cpu;
24 #ifdef CONFIG_DEBUG_LOCK_ALLOC
25 struct lockdep_map dep_map;
29 #define RWLOCK_MAGIC 0xdeaf1eed
31 #ifdef CONFIG_DEBUG_LOCK_ALLOC
32 # define RW_DEP_MAP_INIT(lockname) .dep_map = { .name = #lockname }
34 # define RW_DEP_MAP_INIT(lockname)
37 #ifdef CONFIG_DEBUG_SPINLOCK
38 #define __RW_LOCK_UNLOCKED(lockname) \
39 (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \
40 .magic = RWLOCK_MAGIC, \
41 .owner = SPINLOCK_OWNER_INIT, \
43 RW_DEP_MAP_INIT(lockname) }
45 #define __RW_LOCK_UNLOCKED(lockname) \
46 (rwlock_t) { .raw_lock = __ARCH_RW_LOCK_UNLOCKED, \
47 RW_DEP_MAP_INIT(lockname) }
50 #define DEFINE_RWLOCK(name) \
51 rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
53 #endif /* __LINUX_RWLOCK_TYPES_H */