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 #define DEFINE_RWLOCK(x) rwlock_t x = __RW_LOCK_UNLOCKED(x) 47 48 #endif /* __LINUX_RWLOCK_TYPES_H */ 49