[Bug 218652] lang/python36: thread issue in external library (both ctypes and C extension)

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218652

            Bug ID: 218652
           Summary: lang/python36: thread issue in external library (both
                    ctypes and C extension)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: python at FreeBSD.org
          Reporter: sylvain at sylvaingarrigues.com
          Assignee: python at FreeBSD.org
             Flags: maintainer-feedback?(python at FreeBSD.org)

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

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