void ggLock(void *lock)
{
int *lck = lock;
int i = 0;
while (testandset(lck)) {
if (i < GGLOCK_COUNT) {
i++;
#ifdef HAVE_SCHED_YIELD
sched_yield();
#endif
} else {
#ifdef HAVE_NANOSLEEP
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = (GGLOCK_SLEEP_US*1000);
nanosleep(&ts, NULL);
#else
ggUSleep(GGLOCK_SLEEP_US);
#endif
i = 0;
}
}
return;
}
int ggTryLock(void *lock)
{
int *lck = lock;
if (testandset(lck)) return GGI_EBUSY;
return 0;
}
int
__pthread_spin_lock (pthread_spinlock_t *lock)
{
while (testandset (lock) != 0)
;
return 0;
}
/** semSignal **/
void semPost(semaphore_t *semaphore) {
/** STUBBED **/
runningTCB->inLock = 1;
while (testandset(&(semaphore->locallock)) != 0) {
tyield();
}
semaphore->count++;
if( semaphore->count <= 0 ) {
queue(readyList[0],dequeue(semaphore->waitlist));
}
semaphore->locallock = 0;
runningTCB->inLock = 0;
}
/** semWait **/
void semWait(semaphore_t *semaphore) {
/** STUBBED **/
runningTCB->inLock = 1;
while (testandset(&(semaphore->locallock)) != 0) {
tyield();
}
semaphore->count--;
if( semaphore->count < 0 ) {
queue(semaphore->waitlist, runningTCB);
semaphore->locallock = 0;
runningTCB->inLock = 0;
dispatch();
} else {
semaphore->locallock = 0;
runningTCB->inLock = 0;
}
}
int
__pthread_spin_trylock (pthread_spinlock_t *lock)
{
return testandset (lock) != 0 ? EBUSY : 0;
}