public void Stop(bool immediate)
{
// Hold the lock for as little time as possible
int currentWorkItemCount;
lock (this) {
_cancellationTokenHelper.Cancel(); // dispatched onto a new thread
currentWorkItemCount = _numExecutingWorkItems;
}
if (currentWorkItemCount == 0)
{
// There was no scheduled work, so we're done
FinalShutdown();
}
}