multithreaded application is crashing when system goes to standby and resumes

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Hi all,

I don't know what part of the code is throwing the exception. I have a USB autodetect feature in my application.

The exception thrown is as below:

safe handle closed

   at Microsoft.Win32.UnsafeNativeMethods.GetOverlappedResult(SafeFileHandle hFile, NativeOverlapped* lpOverlapped, Int32& lpNumberOfBytesTransferred, Boolean bWait)
   at System.IO.Ports.SerialStream.EventLoopRunner.WaitForCommEvent()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

Please help!

Posted 18-Jan-11 18:59pm

vidya_01

Updated 18-Jan-11 19:02pm

JF2015

v2

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E.F. Nijboer · Answer 1 · 2011-01-18T21:54:00

Solution 1

It is best to detect those events and stop/suspend the thread(s) when they occur. Have a look at the links below about detecting these events.

Handling OS events like Sleep, Stand-by, Hibernate, Power Status Changed, Low Battery, Critial Suspend, AC Power, Battery Power, Battery Life etc... in Windows XP and Vista.[^]

Use System Events To Protect Your Application Data[^]

Good luck!

Posted 18-Jan-11 21:54pm

E.F. Nijboer

Comments

vidya_01 19-Jan-11 4:41am

Thanks so much! The application in the below link works great! but I'm looking for a similar one in C#. Or do you any work around ?

Espen Harlinn 19-Jan-11 5:52am

5+ Good answer, backed up by informative links

#realJSOP · Answer 2 · 2011-01-18T23:34:00

Solution 2

The 2nd link was in C#. Of course, the code in the article isn't going to be an exact fit for your needs, but being a programmer, you shouldn't have any issues extracting and adapting the code you need from it, right?

Posted 18-Jan-11 23:34pm

#realJSOP

Comments

vidya_01 19-Jan-11 5:47am

I went thru that. I have implemented the following similar code in my application:
private void SystemEvents_PowerModeChanged(object sender, Microsoft.Win32.PowerModeChangedEventArgs e)
{
//The system is going into or resuming from standby
if (e.Mode == Microsoft.Win32.PowerModes.Suspend)
{
mLog.Info("System is going into standby, FST must shutdown");
clsMessageBroker.Shutdown();

}
else if (e.Mode == Microsoft.Win32.PowerModes.Resume)
{
mLog.Info("System is resuming from standby");

}
But this is not helping. I doubt the autodetect has got to do soemthing with the problem. It has a lot of handlers called thru the wndprc method, but i'm not sure how they r getting closed or which of htem is throwing the exception which is leading to the crash.