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added qse_mtx_trylock() and QSE::Mutex::trylock()

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hyung-hwan
2018-08-16 03:45:17 +00:00
parent 0aca321aee
commit 73567527f1
8 changed files with 99 additions and 9 deletions
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32
qse/lib/si/mtx.c
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@ -202,9 +202,8 @@ int qse_mtx_lock (qse_mtx_t* mtx, const qse_ntime_t* waiting_time)
/* TODO: check for B_WOULD_BLOCK */
/*if (acquire_sem_etc(mtx->hnd, 1, B_ABSOLUTE_TIMEOUT, 0) != B_NO_ERROR) return -1;*/
bigtime_t usec;
usec = QSE_SECNSEC_TO_USEC (waiting_time->sec, waiting_time->nsec);
if (acquire_sem_etc(mtx->hnd, 1, B_TIMEOUT, 0) != B_NO_ERROR) return -1;
if (acquire_sem_etc(mtx->hnd, 1, B_TIMEOUT, usec) != B_NO_ERROR) return -1;
}
else
{
@ -261,4 +260,33 @@ int qse_mtx_unlock (qse_mtx_t* mtx)
return 0;
}
int qse_mtx_trylock (qse_mtx_t* mtx)
{
#if defined(_WIN32)
if (WaitForSingleObject(mtx->hnd, 0) != WAIT_OBJECT_0) return -1;
#elif defined(__OS2__)
if (DosRequestMutexSem(mtx->hnd, 0) != NO_ERROR) return -1;
#elif defined(__DOS__)
/* nothing to do */
#elif defined(__BEOS__)
if (acquire_sem_etc(mtx->hnd, 1, B_TIMEOUT, 0) != B_NO_ERROR) return -1;
#else
#if defined(HAVE_PTHREAD_MUTEX_TRYLOCK)
if (pthread_mutex_trylock((pthread_mutex_t*)&mtx->hnd) != 0) return -1;
#elif defined(HAVE_PTHREAD_MUTEX_TIMEDLOCK)
qse_ntime_t t;
struct timespec ts;
qse_gettime (&t);
ts.tv_sec = t.sec;
ts.tv_nsec = t.nsec;
if (pthread_mutex_timedlock((pthread_mutex_t*)&mtx->hnd, &ts) != 0) return -1;
#else
/* not supported. fallback to normal pthread_mutex_lock(). <--- is this really desirable? */
if (pthread_mutex_lock ((pthread_mutex_t*)&mtx->hnd) != 0) return -1;
#endif
#endif
return 0;
}
#endif