public void Enter(ref bool lockTaken)
{
if (lockTaken)
{
throw new ArgumentException("lockTaken", "lockTaken must be initialized to false");
}
if (isThreadOwnerTrackingEnabled && IsHeldByCurrentThread)
{
throw new LockRecursionException();
}
int slot = -1;
RuntimeHelpers.PrepareConstrainedRegions();
try
{
slot = Interlocked.Increment(ref ticket.Users) - 1;
ServerSpinWait wait = new ServerSpinWait();
while (slot != ticket.Value)
{
wait.SpinOnce();
while (stallTickets != null && stallTickets.TryRemove(ticket.Value))
{
++ticket.Value;
}
}
}
finally
{
if (slot == ticket.Value)
{
lockTaken = true;
threadWhoTookLock = Thread.CurrentThread.ManagedThreadId;
}
else if (slot != -1)
{
// We have been interrupted, initialize stallTickets
if (stallTickets == null)
{
Interlocked.CompareExchange(ref stallTickets, new ServerConcurrentOrderedList <int>(), null);
}
stallTickets.TryAdd(slot);
}
}
}
