include/linux/spinlock_types.h

   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 typedef struct {
  19         raw_spinlock_t raw_lock;
  20 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
  21         unsigned int break_lock;
  22 #endif
  23 #ifdef CONFIG_DEBUG_SPINLOCK
  24         unsigned int magic, owner_cpu;
  25         void *owner;
  26 #endif
  27 } spinlock_t;
  28
  29 #define SPINLOCK_MAGIC          0xdead4ead
  30
  31 typedef struct {
  32         raw_rwlock_t raw_lock;
  33 #if defined(CONFIG_PREEMPT) && defined(CONFIG_SMP)
  34         unsigned int break_lock;
  35 #endif
  36 #ifdef CONFIG_DEBUG_SPINLOCK
  37         unsigned int magic, owner_cpu;
  38         void *owner;
  39 #endif
  40 } rwlock_t;
  41
  42 #define RWLOCK_MAGIC            0xdeaf1eed
  43
  44 #define SPINLOCK_OWNER_INIT     ((void *)-1L)
  45
  46 #ifdef CONFIG_DEBUG_SPINLOCK
  47 # define SPIN_LOCK_UNLOCKED                                             \
  48         (spinlock_t)    {       .raw_lock = __RAW_SPIN_LOCK_UNLOCKED,   \
  49                                 .magic = SPINLOCK_MAGIC,                \
  50                                 .owner = SPINLOCK_OWNER_INIT,           \
  51                                 .owner_cpu = -1 }
  52 #define RW_LOCK_UNLOCKED                                                \
  53         (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED,     \
  54                                 .magic = RWLOCK_MAGIC,                  \
  55                                 .owner = SPINLOCK_OWNER_INIT,           \
  56                                 .owner_cpu = -1 }
  57 #else
  58 # define SPIN_LOCK_UNLOCKED \
  59         (spinlock_t)    {       .raw_lock = __RAW_SPIN_LOCK_UNLOCKED }
  60 #define RW_LOCK_UNLOCKED \
  61         (rwlock_t)      {       .raw_lock = __RAW_RW_LOCK_UNLOCKED }
  62 #endif
  63
  64 #define DEFINE_SPINLOCK(x)      spinlock_t x = SPIN_LOCK_UNLOCKED
  65 #define DEFINE_RWLOCK(x)        rwlock_t x = RW_LOCK_UNLOCKED
  66
  67 #endif /* __LINUX_SPINLOCK_TYPES_H */