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gh-124111: Fix TCL 9 thread detection (GH-128103)

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Michael Cho 2025-11-12 17:16:58 -05:00 • committed by GitHub
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Misc/NEWS.d/next/Library/2025-11-12-15-42-47.gh-issue-124111.hTw4OE.rst Normal file
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@ -0,0 +1,2 @@
Updated Tcl threading configuration in :mod:`_tkinter` to assume that
threads are always available in Tcl 9 and later.

4
Modules/_tkinter.c
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@ -575,8 +575,12 @@ Tkapp_New(const char *screenName, const char *className,
v->interp = Tcl_CreateInterp();
v->wantobjects = wantobjects;
#if TCL_MAJOR_VERSION >= 9
v->threaded = 1;
#else
v->threaded = Tcl_GetVar2Ex(v->interp, "tcl_platform", "threaded",
TCL_GLOBAL_ONLY) != NULL;
#endif
v->thread_id = Tcl_GetCurrentThread();
v->dispatching = 0;
v->trace = NULL;