private void DoWork()
{
/* Check frozen. */
if (FreezableClock.IsFrozen && !_pausedEvent.WaitOne())
{
return;
}
var now = ProgramTime;
/* Do sleep waiting while greater than 2 x sleep period */
var sleepWaitPeriod = SleepWaitPeriod;
if (sleepWaitPeriod.Ticks > 0)
{
while (!_stageSkipped.Value && FreezableClock.Unit.ConvertTo((long)(_nextUpdateTime - now), TimeUnit.Tick) > sleepWaitPeriod.Ticks * 2)
{
Thread.Sleep(sleepWaitPeriod);
now = ProgramTime;
}
}
/* Do busy waiting while less than 2 x sleep period */
while (now < _nextUpdateTime && !_stageSkipped.Value)
{
if (FreezableClock.IsFrozen)
{
return; /* Exit busy waiting while paused */
}
now = ProgramTime;
}
/* Actual processing procedures */
do
{
/* Reset skip state */
_stageSkipped.Reset();
/* Get next stage, exit on null (END REACHED) */
Stage stage = null;
try
{
for (;;) /* Loop only for skip */
{
stage = _stageProvider.Next();
now = ProgramTime;
var eventArgs = new StageChangedEventArgs(now, stage);
StageChanged?.Invoke(this, eventArgs);
if (stage == null)
{
eventArgs.Action = StageAction.Terminate;
}
switch (eventArgs.Action)
{
case StageAction.Terminate: /* Terminate entire program */
goto StopProgram;
case StageAction.Skip: /* Skip current stage directly */
continue;
case StageAction.Pause: /* Pause at the start of the stage */
Pause();
goto BreakOuterLoop;
default: /* Accepted */
goto BreakOuterLoop;
}
BreakOuterLoop:
break;
}
}
catch (ThreadAbortException) { throw; } /* Aborted by stopping underlying runner */
catch (Exception e) /* Process unhandled exception */
{
var eventArgs = new ExceptionEventArgs(e);
UnhandledException?.Invoke(this, eventArgs);
if (!eventArgs.Handled)
{
throw new Exception("Unhandled exception", e);
}
}
/* Update time */
if (stage != null)
{
_nextUpdateTime = now + stage.Duration;
}
continue;
/* Stop */
StopProgram:
Stop();
return;
} while (now >= _nextUpdateTime || _stageSkipped.Value); /* Check if need to move next */
}