New submission from Thomas Holder <thomas.hol...@schrodinger.com>:
The attached demo application runs a Tkinter GUI and a PyQt GUI in the same thread. PyQt owns the main loop and keeps updating the Tkinter instance by calling `update()`. On Windows, when binding a "<Configure>" event, resizing the Tk window will lead to a crash: ``` Fatal Python error: PyEval_RestoreThread: NULL tstate Current thread 0x00001f1c (most recent call first): File "qt_tk_demo.py", line 50 in <module> ``` This crash happens in `_tkinter.c` in `PythonCmd` inside the `ENTER_PYTHON` macro. The issue can be fixed by using `PyGILState_Ensure` and `PyGILState_Release` instead of the `ENTER_PYTHON` macro inside the `PythonCmd` function. ---------- components: Tkinter, Windows files: qt_tk_demo.py messages: 365064 nosy: Thomas Holder, paul.moore, steve.dower, tim.golden, zach.ware priority: normal severity: normal status: open title: _tkinter PythonCmd fails to acquire GIL type: crash Added file: https://bugs.python.org/file49002/qt_tk_demo.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue40075> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
