public static Timer CreateTimer(ClrSyncManager manager, Original::TimerCallback timerCallback, object state, TimeSpan dueTime, TimeSpan period)
{
TimerRoutineArg argument = new TimerRoutineArg();
argument.callback = timerCallback;
argument.state = state;
argument.dueTime = dueTime;
argument.Period = period;
argument.selfSemaphore = new Semaphore(0, 1);
argument.parentSemaphore = new Semaphore(0, 1);
argument.disposed = false;
argument.changed = true;
Timer ret = new Timer(TimerCreateWrapper, argument, 0, Timeout.Infinite);
argument.timer = ret;
timer2tra.Add(ret, argument);
int child = manager.TaskFork();
argument.parentSemaphore.WaitOne();
manager.RegisterTaskSemaphore(child, argument.selfSemaphore, false);
manager.TaskResume(child);
return(ret);
}
// dueTime: the amount of time to delay before callback is invoked, in milliseconds.
// Specify Timeout.Infinite to prevent the timer from starting.
// Specify zero (0) to start the timer immediately.
// period: The time interval between invocations of callback, in milliseconds.
// Specify Timeout.Infinite to disable periodic signaling.
// The method specified for callback should be reentrant, because it is called on ThreadPool threads.
// The method can be executed simultaneously on two thread pool threads if the timer interval is less
// than the time required to execute the method, or if all thread pool threads are in use and the method
// is queued multiple times.
public static void TimerCreateWrapper(object start)
{
try
{
TimerRoutineArg argument = (TimerRoutineArg)start;
argument.inLoop = true;
argument.changed = false;
argument.parentSemaphore.Release();
ClrSyncManager manager = ClrSyncManager.SyncManager;
manager.ThreadBegin(argument.selfSemaphore);
Exception exception = null;
while (true)
{
manager.SetMethodInfo("Timer.read");
manager.SyncVarAccess(argument.timer, MSyncVarOp.RWVAR_READWRITE);
manager.CommitSyncVarAccess();
if (timer2tra[argument.timer].disposed)
{
// the timer only goes away when it is disposed of
// it may be disabled, but a Change can reenable it
break;
}
manager.TaskYield(); // until fairness deals with unbounded thread creation
manager.TaskYield(); // we yield twice
if (!argument.dueTime.Equals(TimeSpan.FromTicks(Timeout.Infinite)))
{
MChessChess.LeaveChess();
try
{
argument.callback(argument.state);
}
catch (Exception e) // catch recoverable exception in monitored code
{
exception = e;
}
MChessChess.EnterChess();
// If period is zero (0) or Infinite and dueTime is not Infinite, callback is invoked once;
// the periodic behavior of the timer is disabled, but can be re-enabled using the Change method.
}
if (exception != null)
{
break;
}
if (argument.changed)
{
argument.changed = false;
continue;
}
if (argument.Period.Equals(TimeSpan.FromTicks(Timeout.Infinite)) || argument.Period.Equals(TimeSpan.FromTicks(0)))
{
break;
}
}
argument.inLoop = false;
if (timer2tra[argument.timer].disposed)
{
timer2tra.Remove(argument.timer);
}
if (manager.BreakDeadlockMode)
{
MChessChess.WakeNextDeadlockedThread(false, true);
}
else if (exception == null)
{
manager.ThreadEnd(System.Threading.Thread.CurrentThread);
}
else
{
manager.Shutdown(exception);
}
}
catch (Exception e) // catch fatal error in our code
{
ClrSyncManager manager = ClrSyncManager.SyncManager;
manager.Shutdown(e);
}
}
