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  1. #ifndef __LINUX_RWLOCK_H
  2. #define __LINUX_RWLOCK_H
  3.  
  4. #ifndef __LINUX_SPINLOCK_H
  5. # error "please don't include this file directly"
  6. #endif
  7.  
  8. /*
  9.  * rwlock related methods
  10.  *
  11.  * split out from spinlock.h
  12.  *
  13.  * portions Copyright 2005, Red Hat, Inc., Ingo Molnar
  14.  * Released under the General Public License (GPL).
  15.  */
  16.  
  17. #ifdef CONFIG_DEBUG_SPINLOCK
  18.   extern void __rwlock_init(rwlock_t *lock, const char *name,
  19.                             struct lock_class_key *key);
  20. # define rwlock_init(lock)                                      \
  21. do {                                                            \
  22.         static struct lock_class_key __key;                     \
  23.                                                                 \
  24.         __rwlock_init((lock), #lock, &__key);                   \
  25. } while (0)
  26. #else
  27. # define rwlock_init(lock)                                      \
  28.         do { *(lock) = __RW_LOCK_UNLOCKED(lock); } while (0)
  29. #endif
  30.  
  31. #ifdef CONFIG_DEBUG_SPINLOCK
  32.  extern void do_raw_read_lock(rwlock_t *lock) __acquires(lock);
  33. #define do_raw_read_lock_flags(lock, flags) do_raw_read_lock(lock)
  34.  extern int do_raw_read_trylock(rwlock_t *lock);
  35.  extern void do_raw_read_unlock(rwlock_t *lock) __releases(lock);
  36.  extern void do_raw_write_lock(rwlock_t *lock) __acquires(lock);
  37. #define do_raw_write_lock_flags(lock, flags) do_raw_write_lock(lock)
  38.  extern int do_raw_write_trylock(rwlock_t *lock);
  39.  extern void do_raw_write_unlock(rwlock_t *lock) __releases(lock);
  40. #else
  41. # define do_raw_read_lock(rwlock)       do {__acquire(lock); arch_read_lock(&(rwlock)->raw_lock); } while (0)
  42. # define do_raw_read_lock_flags(lock, flags) \
  43.                 do {__acquire(lock); arch_read_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)
  44. # define do_raw_read_trylock(rwlock)    arch_read_trylock(&(rwlock)->raw_lock)
  45. # define do_raw_read_unlock(rwlock)     do {arch_read_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
  46. # define do_raw_write_lock(rwlock)      do {__acquire(lock); arch_write_lock(&(rwlock)->raw_lock); } while (0)
  47. # define do_raw_write_lock_flags(lock, flags) \
  48.                 do {__acquire(lock); arch_write_lock_flags(&(lock)->raw_lock, *(flags)); } while (0)
  49. # define do_raw_write_trylock(rwlock)   arch_write_trylock(&(rwlock)->raw_lock)
  50. # define do_raw_write_unlock(rwlock)    do {arch_write_unlock(&(rwlock)->raw_lock); __release(lock); } while (0)
  51. #endif
  52.  
  53. #define read_can_lock(rwlock)           arch_read_can_lock(&(rwlock)->raw_lock)
  54. #define write_can_lock(rwlock)          arch_write_can_lock(&(rwlock)->raw_lock)
  55.  
  56. /*
  57.  * Define the various rw_lock methods.  Note we define these
  58.  * regardless of whether CONFIG_SMP or CONFIG_PREEMPT are set. The various
  59.  * methods are defined as nops in the case they are not required.
  60.  */
  61. #define read_trylock(lock)      __cond_lock(lock, _raw_read_trylock(lock))
  62. #define write_trylock(lock)     __cond_lock(lock, _raw_write_trylock(lock))
  63.  
  64. #define write_lock(lock)        _raw_write_lock(lock)
  65. #define read_lock(lock)         _raw_read_lock(lock)
  66.  
  67. #if defined(CONFIG_SMP) || defined(CONFIG_DEBUG_SPINLOCK)
  68.  
  69. #define read_lock_irqsave(lock, flags)                  \
  70.         do {                                            \
  71.                 typecheck(unsigned long, flags);        \
  72.                 flags = _raw_read_lock_irqsave(lock);   \
  73.         } while (0)
  74. #define write_lock_irqsave(lock, flags)                 \
  75.         do {                                            \
  76.                 typecheck(unsigned long, flags);        \
  77.                 flags = _raw_write_lock_irqsave(lock);  \
  78.         } while (0)
  79.  
  80. #else
  81.  
  82. #define read_lock_irqsave(lock, flags)                  \
  83.         do {                                            \
  84.                 typecheck(unsigned long, flags);        \
  85.                 _raw_read_lock_irqsave(lock, flags);    \
  86.         } while (0)
  87. #define write_lock_irqsave(lock, flags)                 \
  88.         do {                                            \
  89.                 typecheck(unsigned long, flags);        \
  90.                 _raw_write_lock_irqsave(lock, flags);   \
  91.         } while (0)
  92.  
  93. #endif
  94.  
  95. #define read_lock_irq(lock)             _raw_read_lock_irq(lock)
  96. #define read_lock_bh(lock)              _raw_read_lock_bh(lock)
  97. #define write_lock_irq(lock)            _raw_write_lock_irq(lock)
  98. #define write_lock_bh(lock)             _raw_write_lock_bh(lock)
  99. #define read_unlock(lock)               _raw_read_unlock(lock)
  100. #define write_unlock(lock)              _raw_write_unlock(lock)
  101. #define read_unlock_irq(lock)           _raw_read_unlock_irq(lock)
  102. #define write_unlock_irq(lock)          _raw_write_unlock_irq(lock)
  103.  
  104. #define read_unlock_irqrestore(lock, flags)                     \
  105.         do {                                                    \
  106.                 typecheck(unsigned long, flags);                \
  107.                 _raw_read_unlock_irqrestore(lock, flags);       \
  108.         } while (0)
  109. #define read_unlock_bh(lock)            _raw_read_unlock_bh(lock)
  110.  
  111. #define write_unlock_irqrestore(lock, flags)            \
  112.         do {                                            \
  113.                 typecheck(unsigned long, flags);        \
  114.                 _raw_write_unlock_irqrestore(lock, flags);      \
  115.         } while (0)
  116. #define write_unlock_bh(lock)           _raw_write_unlock_bh(lock)
  117.  
  118. #define write_trylock_irqsave(lock, flags) \
  119. ({ \
  120.         local_irq_save(flags); \
  121.         write_trylock(lock) ? \
  122.         1 : ({ local_irq_restore(flags); 0; }); \
  123. })
  124.  
  125. #endif /* __LINUX_RWLOCK_H */
  126.