kernel/include/linux/rwlock_types_rt.h

   1 #ifndef __LINUX_RWLOCK_TYPES_RT_H
   2 #define __LINUX_RWLOCK_TYPES_RT_H
   3
   4 #ifndef __LINUX_SPINLOCK_TYPES_H
   5 #error "Do not include directly. Include spinlock_types.h instead"
   6 #endif
   7
   8 /*
   9  * rwlocks - rtmutex which allows single reader recursion
  10  */
  11 typedef struct {
  12         struct rt_mutex         lock;
  13         int                     read_depth;
  14         unsigned int            break_lock;
  15 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  16         struct lockdep_map      dep_map;
  17 #endif
  18 } rwlock_t;
  19
  20 #ifdef CONFIG_DEBUG_LOCK_ALLOC
  21 # define RW_DEP_MAP_INIT(lockname)      .dep_map = { .name = #lockname }
  22 #else
  23 # define RW_DEP_MAP_INIT(lockname)
  24 #endif
  25
  26 #define __RW_LOCK_UNLOCKED(name) \
  27         { .lock = __RT_MUTEX_INITIALIZER_SAVE_STATE(name.lock), \
  28           RW_DEP_MAP_INIT(name) }
  29
  30 #define DEFINE_RWLOCK(name) \
  31         rwlock_t name __cacheline_aligned_in_smp = __RW_LOCK_UNLOCKED(name)
  32
  33 #endif