Bug when attempting embedding widget in container with thread

[walle19]

Hi All,
I am currently working on project in which I embed an external application in a QX11EmbedContainer object. The method I use is as follows:

int embedAppInContainer(std::string& windowHint, QX11EmbedContainer* container, time_t timeout) {
    int winID = pollWIndowID(windowHint, timeout)
    if (FAIL != winID) {
        container->embedClient(winID)
        return SUCCESS
    }
}

This method works fine when performed on the main thread with no errors and the application gets embedded as intended.

When I pass this method to a boost::thread things get unstable :
Most times I execute the application I get the following error - Fatal IO error: client killed - and the app crashes and generates a core file that shows the following backtrace:

#0 raise in libc-2.19.so
#1 abort in libc-2.19.so
#2 __libc_message in libc-2.19.so
#3 _int_free in libc-2.19.so
#4 _XReply in libX11.so.6
#5 XQueryTree in libX11.so.6
#6 embedClient in libQtGui.so.4
#7 embedAppInContainer in libcontroller.so
#8 thread_proxy in libboost_thread.so.1.59.0
#9 start_thread in libpthread-2.19.so
#10 __clone in libc-2.19.so

Every few execution the method suddenly works fine and the error doesn't occur.

Any insights will be much appreciated.
Thanks

[Christian Ehrlicher]

You must not do anything in the gui outside the main gui thread!

[walle19]

@Christian-Ehrlicher Understood. Thanks for your reply