New submission from sylgar: Hello,
I have libsylvain.so which has just one function (sylvain_display()) which displays an hello world windows through QT libraries. I have this one program `sylvain' which is a single line program which calls sylvain_display from libsylvain.so. When I run `sylvain', I have some debug output from QT on the console, and the hello world window is displayed on my TV (I am running this on a Raspberry Pi with FreeBSD). Now, when I run python2.7 or python3.6, and load libsylvain.so either through the ctypes module or through a C extension module, and call the sylvain_display() function from python, I have the console log output from QT as with the `sylvain' program, but I don't have the window on my TV! I guess the rendering to the TV is done on a separate thread and this one is not called or locked? I came up with this simple test program to isolate the issue because both PyQT and PySide now don't work as expected, I have console log but no actual TV output. This used to work one year ago, I don't know what has changed in Python. Hope you guys will figure this out. libsylvain.cpp: http://dev.sylvaingarrigues.com/libsylvain.cpp sylvain.cpp (test program for libsylvain): http://dev.sylvaingarrigues.com/sylvain.cpp sylvain-ctypes.py (load libsylvain): http://dev.sylvaingarrigues.com/sylvain-ctypes.py Also tried with a C extension to rule out ctypes bug, same issue: sylvainmodule.cpp (python module wrapper): http://dev.sylvaingarrigues.com/sylvainmodule.cpp sylvain-next.pu (load sylvainmodule and sylvain_display): http://dev.sylvaingarrigues.com/sylvain-cext.py build script: http://dev.sylvaingarrigues.com/build.sh ---------- components: Extension Modules, FreeBSD, ctypes messages: 291644 nosy: koobs, sylgar priority: normal severity: normal status: open title: External library behave differently when loaded by Python (maybe thread issue) versions: Python 2.7, Python 3.3, Python 3.4, Python 3.5, Python 3.6, Python 3.7 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue30069> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
