/// <summary>
/// This is called from within the JobQueue and it has QueueModifyLock. Do not try to enqueue or dequeue anything or you risk deadlock.
/// We can safely interrogate the queue because it is ModifyLocked. It might also be EnqueueLocked or DequeueLocked, but not both.
/// </summary>
/// <param name="sender"></param>
/// <param name="newSize"></param>
private void JobQueueQueueSizeChangedEvent(object sender, int newSize)
{
// QueueModifyLock is held, meaning the queue cannot be modified, therefore it's safe to
// make decisions based on the size of the queue and it is safe to raise an event without the queue size changing during the event.
if (newSize == 0)
{
QueueIsEmpty.Set();
}
else if (_oldSize == 0)
{
QueueIsEmpty.Reset();
}
// This event must not try to enqueue or dequeue anything in the JobQueue.
QueueSizeChangedEvent?.Invoke(this, new SizeChangedEventArgs(_oldSize, newSize));
}
protected void OnThreadManagerQueueSizeChangedEvent(int oldSize, int newSize)
{
QueueSizeChangedEvent?.Invoke(this, new SizeChangedEventArgs(oldSize, newSize));
}