public unsafe void Start()
{
lock (stateLock)
{
if (!Enabled)
{
if (IsSupportedNatively(Interval))
{
var caps = new TimeCaps();
_ = timeGetDevCaps(ref caps, (uint)sizeof(TimeCaps));
var clampedInterval = Math.Clamp((uint)Interval, caps.wPeriodMin, caps.wPeriodMax);
_ = timeBeginPeriod(clampedInterval);
timerId = timeSetEvent(clampedInterval, 1, callbackDelegate, IntPtr.Zero, EventType.TIME_PERIODIC | EventType.TIME_KILL_SYNCHRONOUS);
Enabled = true;
}
else
{
Log.Write("Timer", "Unsupported interval detected, will use fallback timer. Expect high CPU usage", LogLevel.Warning);
fallbackTimer = new FallbackTimer
{
Interval = Interval
};
fallbackTimer.Elapsed += () => Elapsed?.Invoke();
fallbackTimer.Start();
Enabled = true;
}
}
}
}
public void Stop()
{
lock (stateLock)
{
if (Enabled)
{
if (fallbackTimer == null)
{
_ = timeKillEvent(timerId);
_ = timeEndPeriod((uint)Interval);
}
else
{
fallbackTimer.Stop();
fallbackTimer = null;
}
Enabled = false;
}
}
}
