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.NET Forum / Languages / C# / March 2008Threading
Hi folks, In the following code I create a thread and start it. I then call Thread.Sleep() within that thread. Will this cause the thread I created to Sleep or will it cause the main application Thread to sleep? I'm hoping it will cause the created Thread to sleep... class A { private Thread thread; public A() { thread = new Thread(new ThreadStart(Sync)); thread.IsBackground = true; thread.Priority = ThreadPriority.Normal; thread.Start(); } private void Sync() { while (true) { Thread.Sleep(10000); // do stuff } } } > Hi folks, > > In the following code I create a thread and start it. I then call > Thread.Sleep() within that thread. Will this cause the thread I > created to Sleep or will it cause the main application Thread to > sleep? I'm hoping it will cause the created Thread to sleep... Thread.Sleep causes the current thread to block - that means the thread calling the Thread.Sleep method (ie your thread). Incidentally I wonder if someone can answer me if the following code is an ok idea? I set up a "stopEvent" like this: private ManualResetEvent[] stopEvent = new ManualResetEvent[1]; Then in my thread method I have the following loop: for (; ; ) { int index = WaitHandle.WaitAny(stopEvent, 10000, false); if (index != WaitHandle.WaitTimeout) { break; } // do stuff ... } The point being I can then have a "Stop" method to stop the thread, like this: stopEvent[0].Set(); Thanks, Peter -- Not sure why you need the array and WaitAny - and indeed the other problem is that it will be spending lots of time waiting, and not much time *doing* anything. It depends what the system is - if you just want an exit condition, a volatile bool might suffice, or a [Manual|Auto]ResetEvent using the overload of WaitOne that accepts a timeout and returns a bool to indicate whether the flag was set. In other scenarios Monitor.Pulse and Monitor.Wait might be used to help synchronize - especially in scenarios like producer/consumer queues when you expect the queue to be empty, but after adding an item you want the consumer thread to wake up immediately and do something useful (and likewise when terminating it). Marc > Not sure why you need the array and WaitAny - and indeed the other > problem is that it will be spending lots of time waiting, and not [quoted text clipped - 7 lines] > want the consumer thread to wake up immediately and do something > useful (and likewise when terminating it). Hi, thanks for your reply. I do want the thread to wait, do something, and wait again... The wait is configurable, could be many minutes or an hour or so. Could this be a problem with such a long wait? Are there better ways to implement a "do something every 30 minutes" function than using a thread with a 30 minute sleep? The problem with using a bool flag is that it will wait for the timeout before checking the flag and stopping (I think), whereas if I have a "waitany" then the wait will cease as soon as the stopEvent is set. I will look at WaitOne to see what it does... /Peter -- Thanks for the confirmation Peter. I had considered using a bool to control the running of the Thread ie. private bool bRun = true; private void Sync() { while (bRun) { Thread.Sleep(10000); // do stuff } } private void StopThread() { bRun = false; } But then if you want to start the Thread again, a call to Start will throw an Exception? > Incidentally I wonder if someone can answer me if the following code is > an ok idea? [quoted text clipped - 22 lines] > Thanks, > Peter > Thanks for the confirmation Peter. > [quoted text clipped - 15 lines] > bRun = false; > } That will only work if bRun is volatile. See http://pobox.com/~skeet/csharp/threads/volatility.shtml > But then if you want to start the Thread again, a call to Start will throw > an Exception? You can't restart a thread which has terminated - you'd need to create a new thread instead.  SignatureJon Skeet - <skeet@pobox.com> http://www.pobox.com/~skeet Blog: http://www.msmvps.com/jon.skeet World class .NET training in the UK: http://iterativetraining.co.uk Thanks Jon, this is very useful for me. Dav > > Thanks for the confirmation Peter. > > [quoted text clipped - 24 lines] > You can't restart a thread which has terminated - you'd need to create > a new thread instead. That is correct. Sync will be executed by the worker thread, so the Sleep applies to the worker thread; the main thread will carry on doing whatever without interruption. Marc Thankyou for the confirmation Marc, David > That is correct. Sync will be executed by the worker thread, so the Sleep > applies to the worker thread; the main thread will carry on doing whatever > without interruption. > > Marc
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