[New-bugs-announce] [issue33412] Tkinter hangs if using multiple threads and event handlers

[Ivan Pozdeev]

New submission from Ivan Pozdeev <ivan_pozdeev at mail.ru>:

With threaded Tkinter, TkinterHanders3.py from https://bugs.python.org/issue33257 (attached) hangs.

Tracing with thread_debug and a modified trace.py (to show TIDs, attached) shows that worker threads are waiting for the Tcl lock while the main thread that holds it keeps waiting for some other lock with a strange timeout:

19000: PyThread_acquire_lock_timed(00000000001B0F80, 0) called
19000: PyThread_acquire_lock(00000000001B0F80, 0) -> 0
19000: PyThread_acquire_lock_timed(00000000001B0F80, -1000000) called

Tested on 3.6 head, win7 x64, debug build.

----------
components: Tkinter
files: TkinterHanders3.py
messages: 316082
nosy: Ivan.Pozdeev
priority: normal
severity: normal
status: open
title: Tkinter hangs if using multiple threads and event handlers
type: crash
versions: Python 3.6, Python 3.7, Python 3.8
Added file: https://bugs.python.org/file47562/TkinterHanders3.py

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33412>
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