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12:11 AgentTimerTest01 - started module
12:11 Interval Task 01 - Tick
12:11 Interval Task 02 - Tick
12:11 Interval Task 03 - Tick
The thread 0x14edc has exited with code 259 (0x103).
12:12 Interval Task 01 - Tick
The thread 0x1564c has exited with code 259 (0x103).
12:13 Interval Task 01 - Tick
12:13 Interval Task 02 - Tick
The thread 0x14ea8 has exited with code 259 (0x103).
12:14 Interval Task 01 - Tick
12:14 Interval Task 03 - Tick
The thread 0x15768 has exited with code 259 (0x103).
12:15 Interval Task 01 - Tick
12:15 Interval Task 02 - Tick
The thread 0x157e0 has exited with code 259 (0x103).
12:16 Interval Task 01 - Tick
The thread 0x15518 has exited with code 0 (0x0).
The thread 0x15704 has exited with code 259 (0x103).
The thread 0x28b0 has exited with code 259 (0x103).
12:17 Interval Task 01 - Tick
12:17 Interval Task 02 - Tick
12:17 Interval Task 03 - Tick

protected void DoWork(AgentTask taskObj)
{
    this.DoAgentWork();
    DateTime targetTime = DateTime.Now;
    do
    {
        // find our target time
        targetTime = targetTime.GetFutureDateTime(this.Config.Schedule, this.Config.TimeOfDay, this.Config.DayOfWeek, this.Config.Ordinal, this.Config.Month);

        CancellationTokenSource tokenSource = new CancellationTokenSource(targetTime - DateTime.Now);
        Task waiter = new Task(() => 
        {
            SpinWait.SpinUntil( () => tokenSource.IsCancellationRequested || taskObj.CancelToken.IsCancellationRequested);
        }, tokenSource.Token);
        waiter.Start();
        waiter.Wait();
        if (!taskObj.CancelToken.IsCancellationRequested)
        {
            this.DoAgentWork();
        }
    } while (!taskObj.CancelToken.IsCancellationRequested);
}

private void DoAgentWork()
{
    Debug.WriteLine("{0} {1} - Tick", DateTime.Now.ToString("hh:mm"), this.Config.Name);
}