Thread freeze when trying to navigate in the menu

[Neb37]

I currently develop a monitoring software for an industrial machine.

On the main thread I process all the UI events, and in an AsyncTimer I do the data acquisition (via OPC). I protect my data structure using CmtNewLock, CmtGetLock, and CmtReleaseLock. 

The data acquired in the second thread are also used  in the main thread (graph, ...) When I access the data, I call CmtGetLock then do the processing and finish by calling CmtReleaseLock. It works well.

BUT when I navigate the menu bar,  the main thread freeze some times (or freeze after few seconds). It stopped on CmtGetLock and the UI doesn't response anymore (the menu tree is still deployed). The AsyncTimer continued and succeed to release and get the lock.

 Have you any idea about what can cause this bug ?

[Neb37]

I have also tried :

SetSystemAttribute (ATTR_ALLOW_UNSAFE_TIMER_EVENTS, 1);

but unfortunately it didn't change the result ...

[Neb37]

Here is an example of the problem.

Message Edité par Neb37 le 12-03-2008 07:12 AM

[Neb37]

Sorry for the file, it was not the good one.

[OVR_CZ · Accepted solution]

Hi,

    i reproduce your problem on my PC /WinXP,CVI7.1.1, Pentium 4 2GHz/

    it`s seems to be a bug in CmtGetLog with "OPT_TL_PROCESS_EVENTS_WHILE_WAITING" and procesing menu.

    without this attribute, your test application works OK

    try replace in code: CmtNewLock("Catalog",0 /*OPT_TL_PROCESS_EVENTS_WHILE_WAITING*/,&lock_Catalog);

[Neb37]

Thanks,

It works fine. 

It works also fine (with OPT_TL_PROCESS_EVENTS_WHILE_WAITING) when there are no timer on panels but only timer in threads.