/// <summary>
/// Creates new timers. This method is thread-safe.
/// </summary>
/// <param name="callback">The callback.</param>
/// <param name="context">The context.</param>
/// <returns>CountdownTimerTimer.</returns>
public override CancelationTimer CreateTimer(Callback callback, object context)
{
var timer = new CountdownTimerNode(callback, context, Duration, _timers);
// Add this on the tail. (Actually, one before the tail - _timers is the sentinel tail.)
var needProd = false;
lock (_timers)
{
//if (!(_timers.Prev!.Next == _timers))
//{
// NetEventSource.Fail(this, $"Tail corruption.");
//}
// If this is the first timer in the list, we need to create a queue handle and prod the timer thread.
if (_timers.Next == _timers)
{
if (_thisHandle == IntPtr.Zero)
{
_thisHandle = (IntPtr)GCHandle.Alloc(this);
}
needProd = true;
}
timer.Next = _timers;
timer.Prev = _timers.Prev;
_timers.Prev.Next = timer;
_timers.Prev = timer;
}
// If, after we add the new tail, there is a chance that the tail is the next
// node to be processed, we need to wake up the timer thread.
if (needProd)
{
CountdownTimer.Prod();
}
return(timer);
}