[Qt-interest] qmutex unlock - application waits?

[william.crocker at analog.com]

caius ligarius wrote:
> Hi,
> 
> Apologies for posting this for the second time, I still haven't found an 
> solution to this issue
> 
> I see something strange happening in my application. When I try to 
> select QComboBox item in my UI it just waits or freezes for a few 
> seconds and doesn't let me do anything. After pausing the code in 
> run-time I noticed that the app is getting stuck in void 
> QMutex::unlock() function.
>


Run in the debugger.
When it freezes, quickly interrupt.
Examine all threads and see if any are waiting for a mutex.
If so, see if any are hold that mutex.

Or, just in general see what the program is doing.
Is the CPU meter pegged during the freeze, etc.

Bill


> I have attached a stripped down version of my UI code (which is 
> compilable) along with .ui file for reference.
> (I have also attached solution file from VS2008 which I am using just in 
> case)
> 
> To reproduce this problem randomly keep selecting items from the 
> combo-box (top right side) and eventually it will get stuck for a few 
> seconds in the QMutex::unlock() function.
> 
> Thanks in advance,
> Caius
> 
> 
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