protected bool ConfirmShutdown()
{
if (!this.IsShuttingDown)
{
return(false);
}
Contract.Assert(this.InEventLoop, "must be invoked from an event loop");
this.CancelScheduledTasks();
if (this.gracefulShutdownStartTime == PreciseTimeSpan.Zero)
{
this.gracefulShutdownStartTime = PreciseTimeSpan.FromStart;
}
if (this.RunAllTasks() || this.RunShutdownHooks())
{
if (this.IsShutdown)
{
// Executor shut down - no new tasks anymore.
return(true);
}
// There were tasks in the queue. Wait a little bit more until no tasks are queued for the quiet period.
this.WakeUp(true);
return(false);
}
PreciseTimeSpan nanoTime = PreciseTimeSpan.FromStart;
if (this.IsShutdown || (nanoTime - this.gracefulShutdownStartTime > this.gracefulShutdownTimeout))
{
return(true);
}
if (nanoTime - this.lastExecutionTime <= this.gracefulShutdownQuietPeriod)
{
// Check if any tasks were added to the queue every 100ms.
// TODO: Change the behavior of takeTask() so that it returns on timeout.
// todo: ???
this.WakeUp(true);
Thread.Sleep(100);
return(false);
}
// No tasks were added for last quiet period - hopefully safe to shut down.
// (Hopefully because we really cannot make a guarantee that there will be no execute() calls by a user.)
return(true);
}
