release/src-rt-6.x/linux/linux-2.6/sound/core/seq/seq_lock.h

   1 #ifndef __SND_SEQ_LOCK_H
   2 #define __SND_SEQ_LOCK_H
   3
   4 #include <linux/sched.h>
   5
   6 #if defined(CONFIG_SMP) || defined(CONFIG_SND_DEBUG)
   7
   8 typedef atomic_t snd_use_lock_t;
   9
  10 /* initialize lock */
  11 #define snd_use_lock_init(lockp) atomic_set(lockp, 0)
  12
  13 /* increment lock */
  14 #define snd_use_lock_use(lockp) atomic_inc(lockp)
  15
  16 /* release lock */
  17 #define snd_use_lock_free(lockp) atomic_dec(lockp)
  18
  19 /* wait until all locks are released */
  20 void snd_use_lock_sync_helper(snd_use_lock_t *lock, const char *file, int line);
  21 #define snd_use_lock_sync(lockp) snd_use_lock_sync_helper(lockp, __BASE_FILE__, __LINE__)
  22
  23 #else /* SMP || CONFIG_SND_DEBUG */
  24
  25 typedef spinlock_t snd_use_lock_t;      /* dummy */
  26 #define snd_use_lock_init(lockp) /**/
  27 #define snd_use_lock_use(lockp) /**/
  28 #define snd_use_lock_free(lockp) /**/
  29 #define snd_use_lock_sync(lockp) /**/
  30
  31 #endif /* SMP || CONFIG_SND_DEBUG */
  32
  33 #endif /* __SND_SEQ_LOCK_H */