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[3.13] gh-124111: Fix TCL 9 thread detection (GH-128103) #141483

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Merged
zware merged 1 commit into from
Nov 12, 2025
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[3.13] gh-124111: Fix TCL 9 thread detection (GH-128103) #141483

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gh-124111: Fix TCL 9 thread detection (GH-128103) 
(cherry picked from commit dc09870)

Co-authored-by: Michael Cho <michael@michaelcho.dev>
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@cho-m @miss-islington
cho-m authored and miss-islington committed Nov 12, 2025
commit 7bd0cdc75f6b4ec0e4c248b60cd8618dbad240e8
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-11-12-15-42-47.gh-issue-124111.hTw4OE.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Updated Tcl threading configuration in :mod:`_tkinter` to assume that
threads are always available in Tcl 9 and later.
4 changes: 4 additions & 0 deletions Modules/_tkinter.c
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Expand Up @@ -586,8 +586,12 @@ 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;
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