MAGMA_DLLPORT int MAGMA_CDECL pthread_cond_wait(pthread_cond_t *cond, pthread_mutex_t *mutex)
{
int last;
if ( *mutex == PTHREAD_MUTEX_INITIALIZER ) pthread_mutex_check_for_static_initialization( mutex );
/* Avoid race condition on waiting thread counter. */
EnterCriticalSection(&cond->cs);
cond->waitCount++;
LeaveCriticalSection(&cond->cs);
/* Releases _atomically_ the mutex and wait on the semaphore until
pthread_cond_signal() or pthread_cond_broadcast() are called (by another thread). */
SignalObjectAndWait(*mutex, cond->hSem, INFINITE, FALSE);
/* Avoid race condition on waiting thread counter. */
EnterCriticalSection(&cond->cs);
cond->waitCount--; /* this thread doesn't wait any more */
/* if this is the last thread to have waited */
last = cond->waitCount == 0;
LeaveCriticalSection(&cond->cs);
/* If this thread is the last waiter thread during this particular broadcast
then let all the other threads proceed. */
if (last)
/* This call ensures that two things happen atomically: signaling the hEvt event and
waiting until "mutex" can be acquired. */
SignalObjectAndWait(cond->hEvt, *mutex, INFINITE, FALSE);
else
WaitForSingleObject(*mutex, INFINITE); /* Upon return, this thread has to own "mutex". */
return 0;
}
QUARK_DLLPORT int QUARK_CDECL pthread_mutex_trylock(pthread_mutex_t *mutex) {
DWORD rv;
if ( *mutex == PTHREAD_MUTEX_INITIALIZER ) pthread_mutex_check_for_static_initialization( mutex );
rv = WaitForSingleObject( *mutex, 0 );
switch (rv) {
case WAIT_OBJECT_0: /** the wait was succesful */
return 0;
case WAIT_FAILED: /** the wait failed */
return -1;
case WAIT_ABANDONED: /** thread killed during the wait */
return -1;
case WAIT_TIMEOUT: /** impossible because of INFINITE */
return -1;
default:
return -1;
}
}
