LXR linux/include/linux/spinlock

   1#ifndef __LINUX_SPINLOCK_TYPES_H
   2#define __LINUX_SPINLOCK_TYPES_H
   3
   4/*
   5 * include/linux/spinlock_types.h - generic spinlock 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
  12#if defined(CONFIG_SMP)
  13# include <asm/spinlock_types.h>
  14#else
  15# include <linux/spinlock_types_up.h>
  16#endif
  17
  18#include <linux/lockdep.h>
  19
  20typedef struct raw_spinlock {
  21        arch_spinlock_t raw_lock;
  22#ifdef CONFIG_DEBUG_SPINLOCK
  23        unsigned int magic, owner_cpu;
  24        void *owner;
  25#endif
  26#ifdef CONFIG_DEBUG_LOCK_ALLOC
  27        struct lockdep_map dep_map;
  28#endif
  29} raw_spinlock_t;
  30
  31#define SPINLOCK_MAGIC          0xdead4ead
  32
  33#define SPINLOCK_OWNER_INIT     ((void *)-1L)
  34
  35#ifdef CONFIG_DEBUG_LOCK_ALLOC
  36# define SPIN_DEP_MAP_INIT(lockname)    .dep_map = { .name = #lockname }
  37#else
  38# define SPIN_DEP_MAP_INIT(lockname)
  39#endif
  40
  41#ifdef CONFIG_DEBUG_SPINLOCK
  42# define SPIN_DEBUG_INIT(lockname)              \
  43        .magic = SPINLOCK_MAGIC,                \
  44        .owner_cpu = -1,                        \
  45        .owner = SPINLOCK_OWNER_INIT,
  46#else
  47# define SPIN_DEBUG_INIT(lockname)
  48#endif
  49
  50#define __RAW_SPIN_LOCK_INITIALIZER(lockname)   \
  51        {                                       \
  52        .raw_lock = __ARCH_SPIN_LOCK_UNLOCKED,  \
  53        SPIN_DEBUG_INIT(lockname)               \
  54        SPIN_DEP_MAP_INIT(lockname) }
  55
  56#define __RAW_SPIN_LOCK_UNLOCKED(lockname)      \
  57        (raw_spinlock_t) __RAW_SPIN_LOCK_INITIALIZER(lockname)
  58
  59#define DEFINE_RAW_SPINLOCK(x)  raw_spinlock_t x = __RAW_SPIN_LOCK_UNLOCKED(x)
  60
  61typedef struct spinlock {
  62        union {
  63                struct raw_spinlock rlock;
  64
  65#ifdef CONFIG_DEBUG_LOCK_ALLOC
  66# define LOCK_PADSIZE (offsetof(struct raw_spinlock, dep_map))
  67                struct {
  68                        u8 __padding[LOCK_PADSIZE];
  69                        struct lockdep_map dep_map;
  70                };
  71#endif
  72        };
  73} spinlock_t;
  74
  75#define __SPIN_LOCK_INITIALIZER(lockname) \
  76        { { .rlock = __RAW_SPIN_LOCK_INITIALIZER(lockname) } }
  77
  78#define __SPIN_LOCK_UNLOCKED(lockname) \
  79        (spinlock_t ) __SPIN_LOCK_INITIALIZER(lockname)
  80
  81#define DEFINE_SPINLOCK(x)      spinlock_t x = __SPIN_LOCK_UNLOCKED(x)
  82
  83#include <linux/rwlock_types.h>
  84
  85#endif /* __LINUX_SPINLOCK_TYPES_H */
  86