LXR linux/include/linux/rwlock

   1#ifndef __LINUX_RWLOCK_TYPES_H
   2#define __LINUX_RWLOCK_TYPES_H
   3
   4#if !defined(__LINUX_SPINLOCK_TYPES_H)
   5# error "Do not include directly, include spinlock_types.h"
   6#endif
   7
   8#ifdef CONFIG_DEBUG_LOCK_ALLOC
   9# define RW_DEP_MAP_INIT(lockname)                                      \
  10        .dep_map = {                                                    \
  11                .name = #lockname,                                      \
  12                .wait_type_inner = LD_WAIT_CONFIG,                      \
  13        }
  14#else
  15# define RW_DEP_MAP_INIT(lockname)
  16#endif
  17
  18#ifndef CONFIG_PREEMPT_RT
  19/*
  20 * generic rwlock type definitions and initializers
  21 *
  22 * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
  23 * Released under the General Public License (GPL).
  24 */
  25typedef struct {
  26        arch_rwlock_t raw_lock;
  27#ifdef CONFIG_DEBUG_SPINLOCK
  28        unsigned int magic, owner_cpu;
  29        void *owner;
  30#endif
  31#ifdef CONFIG_DEBUG_LOCK_ALLOC
  32        struct lockdep_map dep_map;
  33#endif
  34} rwlock_t;
  35
  36#define RWLOCK_MAGIC            0xdeaf1eed
  37
  38#ifdef CONFIG_DEBUG_SPINLOCK
  39#define __RW_LOCK_UNLOCKED(lockname)                                    \
  40        (rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
  41                                .magic = RWLOCK_MAGIC,                  \
  42                                .owner = SPINLOCK_OWNER_INIT,           \
  43                                .owner_cpu = -1,                        \
  44                                RW_DEP_MAP_INIT(lockname) }
  45#else
  46#define __RW_LOCK_UNLOCKED(lockname) \
  47        (rwlock_t)      {       .raw_lock = __ARCH_RW_LOCK_UNLOCKED,    \
  48                                RW_DEP_MAP_INIT(lockname) }
  49#endif
  50
  51#define DEFINE_RWLOCK(x)        rwlock_t x = __RW_LOCK_UNLOCKED(x)
  52
  53#else /* !CONFIG_PREEMPT_RT */
  54
  55#include <linux/rwbase_rt.h>
  56
  57typedef struct {
  58        struct rwbase_rt        rwbase;
  59        atomic_t                readers;
  60#ifdef CONFIG_DEBUG_LOCK_ALLOC
  61        struct lockdep_map      dep_map;
  62#endif
  63} rwlock_t;
  64
  65#define __RWLOCK_RT_INITIALIZER(name)                                   \
  66{                                                                       \
  67        .rwbase = __RWBASE_INITIALIZER(name),                           \
  68        RW_DEP_MAP_INIT(name)                                           \
  69}
  70
  71#define __RW_LOCK_UNLOCKED(name) __RWLOCK_RT_INITIALIZER(name)
  72
  73#define DEFINE_RWLOCK(name)                                             \
  74        rwlock_t name = __RW_LOCK_UNLOCKED(name)
  75
  76#endif /* CONFIG_PREEMPT_RT */
  77
  78#endif /* __LINUX_RWLOCK_TYPES_H */
  79