Second Thread running under RunUserInterface generates sporadic GPF

[KristenC]

Hello Danut81,

I ran the example you posted at least 40 times and never saw a general protection fault.  When you run the example and get the crash can you go to Run>>Threads... and see what functions the threads are in? 

[Danut81]

The main thread is in ProcessSystemEvents and the secondary in the RunUserInterface.

If it doesn't crash from inside CVI try to run the .exe outside CVI. In my case it crashes from both sides.

I attach now my compiled .exe. Try to run it to and see if GPF occurs.

[Oliveira]

I had got this error in my application, when I tried to release some threads that I createrd dynamically.

Just before to release the thread I added the command:
CmtWaitForThreadPoolFunctionCompletion

So it works.

[KristenC]

Danut81,

Your executable did not crash for me either.  Did you try Oliveira's suggestion?

[Danut81]

Hi,

I don't hink that adding CmtWaitForThreadPoolFunctionCompletion will help me because the treads causes  the GPF while running not while i 'm trying to finish the thread.

I have tested the application on 4 computers and finally it had crash. How many times you have runed the application?

Sometimes it takes  more than 20 times to run it until it crashes. Try to run it a few times from Cvi and the run it from outside CVI.

Set the Sleep Policy is set to Sleep More while you run it from CVI.

I have added a test.bat file in the archive so it can run automaticaly the program. Run test.bat, i'm sure in the end it will crash.

[KristenC]

Hi,

I let it run at least 40 times and never saw a crash.  Do you only see the crash on one computer, and are unable to do it on the other 3? 

[Danut81]

Hello,

On 4 computers that i made the test  the application crashed. I also tested on 1 computer with CVI 8.1 and againg it crashed.

So, i guess it is not a problem on my system that generates the fault.

[KristenC]

I had a colleague run your program and he was able to get it to crash.  I'll ask around and see if anyone else know what could be causing this problem.

[craige]

Has anyone found a resolution to this issue? I'm having a similar problem with a program that is constructed in the same manner but in CVI 8.0.1. My application crashes occationally on the RunUserInterface but not everytime and it only crashes once I spawn a new thread which calls ProcessSystemEvents in a while(!quit) loop. Other times it fails when calling CVI table functions (InsertTableRows, GetNumTableRows). If I remove these table functions the application will crash at RunUserInterface most of the time.

Thanks,

Craig

[KristenC]

Hello Craig,

It sounds like from your post that there are a number of reasons that could be causing your different crashes.  Usually we see something happening when threads are not carefully managed.  Are you able to narrow down your program to something small that reproduces the crashes some of the time.  If you can, post your project here and I'll take a look at it.