include/linux/rwlock_types.h

   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_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)                                      \
  26         .dep_map = {                                                    \
  27                 .name = #lockname,                                      \
  28                 .wait_type_inner = LD_WAIT_CONFIG,                      \
  29         }
  30 #else
  31 # define RW_DEP_MAP_INIT(lockname)
  32 #endif
  33
  34 #ifdef CONFIG_DEBUG_SPINLOCK
  35 #define __RW_LOCK_UNLOCKED(lockname)                                    \
  36         (rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
  37                                 .magic = RWLOCK_MAGIC,                  \
  38                                 .owner = SPINLOCK_OWNER_INIT,           \
  39                                 .owner_cpu = -1,                        \
  40                                 RW_DEP_MAP_INIT(lockname) }
  41 #else
  42 #define __RW_LOCK_UNLOCKED(lockname) \
  43         (rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
  44                                 RW_DEP_MAP_INIT(lockname) }
  45 #endif
  46
  47 #define DEFINE_RWLOCK(x)        rwlock_t x = __RW_LOCK_UNLOCKED(x)
  48
  49 #endif /* __LINUX_RWLOCK_TYPES_H */