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