public void RegisterCallback(Action onCacelledCallback)
{
if (IsCanceled)
{
onCacelledCallback();
return;
}
var sw = new SpinWaitStolen();
while (true)
{
var wasInstance = _onCancelledCallbacks;
var newInstance = wasInstance + onCacelledCallback;
if (Interlocked.CompareExchange(ref _onCancelledCallbacks, newInstance, wasInstance) == wasInstance)
break;
sw.SpinOnce();
}
}
internal bool TryEnter(bool threadBlockingAllowed = false)
{
const int spinCount = 1000;
if (!threadBlockingAllowed)
return Interlocked.CompareExchange(ref _waitersCount, 1, 0) == 0;
var spinWait = new SpinWaitStolen();
for (var i = 0; i < spinCount; i++)
{
if (Interlocked.CompareExchange(ref _waitersCount, 1, 0) == 0)
return true;
spinWait.SpinOnce();
}
if (Interlocked.Increment(ref _waitersCount) == 1)
return true;
_kernelLock.WaitOne();
return true;
}