LXR linux/include/linux/rwlock

   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