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kernel add
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#ifndef __SND_SEQ_LOCK_H
#define __SND_SEQ_LOCK_H
#include <linux/sched.h>
#if defined(CONFIG_SMP) || defined(CONFIG_SND_DEBUG)
typedef atomic_t snd_use_lock_t;
/* initialize lock */
#define snd_use_lock_init(lockp) atomic_set(lockp, 0)
/* increment lock */
#define snd_use_lock_use(lockp) atomic_inc(lockp)
/* release lock */
#define snd_use_lock_free(lockp) atomic_dec(lockp)
/* wait until all locks are released */
void snd_use_lock_sync_helper(snd_use_lock_t *lock, const char *file, int line);
#define snd_use_lock_sync(lockp) snd_use_lock_sync_helper(lockp, __BASE_FILE__, __LINE__)
#else /* SMP || CONFIG_SND_DEBUG */
typedef spinlock_t snd_use_lock_t; /* dummy */
#define snd_use_lock_init(lockp) /**/
#define snd_use_lock_use(lockp) /**/
#define snd_use_lock_free(lockp) /**/
#define snd_use_lock_sync(lockp) /**/
#endif /* SMP || CONFIG_SND_DEBUG */
#endif /* __SND_SEQ_LOCK_H */
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