public void Leave()
{
bool alreadyDecremented = false;
//nao há ninguem em espera
if (waitingCount == 0)
{
// reitro
Interlocked.Decrement(ref insideCount);
//ainda nao há ninguem À espera, retorno
if (waitingCount == 0)
{
return;
}
alreadyDecremented = true;
}
lock (myLock)
{
// nao existe thread em espera
LinkedListNode <bool> first = waitingQueue.First;
if (first == null)
{
insideCount--;
return;
}
// nao é possivel adquirir, retorno
if (alreadyDecremented && !TryAcquire())
{
return;
}
first.Value = true;
waitingCount -= 1;
waitingQueue.Remove(first);
SyncUtils.Notify(myLock, first);
}
}
