root/include/linux/rwlock_types.h

INCLUDED FROM

   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)      .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 */