/// <summary>
/// Queue a call to complete the wait on the ThreadPool.
/// </summary>
/// <param name="registeredHandle">The handle that completed.</param>
/// <param name="timedOut">Whether or not the wait timed out.</param>
private void QueueWaitCompletion(RegisteredWaitHandle registeredHandle, bool timedOut)
{
registeredHandle.RequestCallback();
// If the handle is a repeating handle, set up the next call. Otherwise, remove it from the wait thread.
if (registeredHandle.Repeating)
{
registeredHandle.RestartTimeout();
}
else
{
UnregisterWait(registeredHandle, blocking: false); // We shouldn't block the wait thread on the unregistration.
}
ThreadPool.UnsafeQueueHighPriorityWorkItemInternal(
new CompleteWaitThreadPoolWorkItem(registeredHandle, timedOut));
}
/// <summary>
/// This method is executed on a dedicated a timer thread. Its purpose is
/// to handle timer requests and notify the TimerQueue when a timer expires.
/// </summary>
private static void TimerThread()
{
AutoResetEvent timerEvent = s_timerEvent;
List <TimerQueue> timersToFire = s_scheduledTimersToFire !;
List <TimerQueue> timers;
lock (timerEvent)
{
timers = s_scheduledTimers !;
}
int shortestWaitDurationMs = Timeout.Infinite;
while (true)
{
timerEvent.WaitOne(shortestWaitDurationMs);
long currentTimeMs = TickCount64;
shortestWaitDurationMs = int.MaxValue;
lock (timerEvent)
{
for (int i = timers.Count - 1; i >= 0; --i)
{
TimerQueue timer = timers[i];
long waitDurationMs = timer._scheduledDueTimeMs - currentTimeMs;
if (waitDurationMs <= 0)
{
timer._isScheduled = false;
timersToFire.Add(timer);
int lastIndex = timers.Count - 1;
if (i != lastIndex)
{
timers[i] = timers[lastIndex];
}
timers.RemoveAt(lastIndex);
continue;
}
if (waitDurationMs < shortestWaitDurationMs)
{
shortestWaitDurationMs = (int)waitDurationMs;
}
}
}
if (timersToFire.Count > 0)
{
foreach (TimerQueue timerToFire in timersToFire)
{
ThreadPool.UnsafeQueueHighPriorityWorkItemInternal(timerToFire);
}
timersToFire.Clear();
}
if (shortestWaitDurationMs == int.MaxValue)
{
shortestWaitDurationMs = Timeout.Infinite;
}
}
}
