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Fix handle leaks in test_tcl when the test is run with -R 3:3. Call explicitly Tcl_FinalizeThread() in test_returning_deeply_nested() to clean up explicitly per-thread state. The test is run in a thread because of the @run_with_limited_c_stack() decorator. On Windows, Tcl_CreateInterp() creates an event in the Tcl notifier implementation. The event is stored in per-thread state which is only cleaned up at exit. Add the private _tkinter._finalize_thread() function. (cherry picked from commit 2781ffe) Co-authored-by: Victor Stinner <vstinner@python.org>
This was referenced Nov 9, 2026
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Fix handle leaks in test_tcl when the test is run with -R 3:3. Call
explicitly Tcl_FinalizeThread() in test_returning_deeply_nested() to
clean up explicitly per-thread state. The test is run in a thread
because of the @run_with_limited_c_stack() decorator.
On Windows, Tcl_CreateInterp() creates an event in the Tcl notifier
implementation. The event is stored in per-thread state which is only
cleaned up at exit.
Add the private _tkinter._finalize_thread() function.
(cherry picked from commit 2781ffe)
Co-authored-by: Victor Stinner vstinner@python.org
Manual backport notes (3.15): the only conflict was in the generated
Modules/clinic/_tkinter.c.h(surrounding context and output checksum differ on 3.15). It was regenerated with the 3.15 Argument Clinic; the generated code is identical to main's.test_tclpasses on 3.15, including with-R 3:3.