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Fast mutexes implementation

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(spin-loop inside pthread_mutex_lock).

thr_mutex.c:
  Added spinloop in mutex_lock
my_pthread.h:
  Added definition of my_pthread_fastmutex_t
configure.in:
  Added --with-fast-mutexes switch


configure.in:
  Added --with-fast-mutexes switch
include/my_pthread.h:
  Added definition of my_pthread_fastmutex_t
mysys/thr_mutex.c:
  Added spinloop in mutex_lock
This commit is contained in:
unknown
2005-12-20 14:56:45 +01:00
parent a62aaaef7a
commit 59b4604611
3 changed files with 122 additions and 0 deletions
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31
include/my_pthread.h
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@ -547,6 +547,37 @@ void safe_mutex_end(FILE *file);
#define safe_mutex_assert_not_owner(mp)
#endif /* SAFE_MUTEX */
#if defined(MY_PTHREAD_FASTMUTEX) && !defined(SAFE_MUTEX)
typedef struct st_my_pthread_fastmutex_t
{
pthread_mutex_t mutex;
uint spins;
} my_pthread_fastmutex_t;
int my_pthread_fastmutex_init(my_pthread_fastmutex_t *mp,
const pthread_mutexattr_t *attr);
int my_pthread_fastmutex_lock(my_pthread_fastmutex_t *mp);
#undef pthread_mutex_init
#undef pthread_mutex_lock
#undef pthread_mutex_unlock
#undef pthread_mutex_destroy
#undef pthread_mutex_wait
#undef pthread_mutex_timedwait
#undef pthread_mutex_t
#undef pthread_cond_wait
#undef pthread_cond_timedwait
#undef pthread_mutex_trylock
#define pthread_mutex_init(A,B) my_pthread_fastmutex_init((A),(B))
#define pthread_mutex_lock(A) my_pthread_fastmutex_lock(A)
#define pthread_mutex_unlock(A) pthread_mutex_unlock(&(A)->mutex)
#define pthread_mutex_destroy(A) pthread_mutex_destroy(&(A)->mutex)
#define pthread_cond_wait(A,B) pthread_cond_wait((A),&(B)->mutex)
#define pthread_cond_timedwait(A,B,C) pthread_cond_timedwait((A),&(B)->mutex,(C))
#define pthread_mutex_trylock(A) pthread_mutex_trylock(&(A)->mutex)
#define pthread_mutex_t my_pthread_fastmutex_t
#endif /* defined(MY_PTHREAD_FASTMUTEX) && !defined(SAFE_MUTEX) */
/* READ-WRITE thread locking */
#ifdef HAVE_BROKEN_RWLOCK /* For OpenUnix */