[pygtk] PyGtk signals and python thread lock

[Carlos Lacasta]

Hello,

I am developing a C++ multithreaded application, under linux, with
embedded python. Some of the python code has to be executed in different
threads and to solve this I release the python thread lock in the main
thread in a sequence like:

    Py_Initialize();
    if (! PyEval_ThreadsInitialized() )
    {
        PyThreadState *py_tstate = 0;
        PyEval_InitThreads();
        py_tstate = PyGILState_GetThisThreadState();
        PyEval_ReleaseThread(py_tstate);
    }

All the embedded python code is executed like

PyGILState_STATE gilstate;
gilstate = PyGILState_Ensure();

.... call python API functions ...

PyGILState_Release(gilstate);

in any of the threads.

This works perfectly OK until some of the python code uses PyGTK to
define a GUI for a particular task and the code connects to signals
emitted by the PyGTK widgets. When that happens the application crashes
immediately because nobody has the python thread lock. Is there a way of
acquiring the python thread lock before having PyGTK calling the
callbacks and release it right after ?

Regards,

Carlos