[3.15] gh-139145: Fix tkinter event loop in interactive mode (GH-152257) - #152291
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serhiy-storchaka merged 1 commit intoJun 26, 2026
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[3.15] gh-139145: Fix tkinter event loop in interactive mode (GH-152257)#152291serhiy-storchaka merged 1 commit intopython:3.15python/cpython:3.15from miss-islington:backport-3ffda34-3.15miss-islington/cpython:backport-3ffda34-3.15Copy head branch name to clipboard
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…-152257) When a Tcl command running its own event loop (such as vwait or wait_variable) was active and the user typed input on stdin, the event loop kept spinning at 100% CPU. The stdin file handler is now removed as soon as input becomes available. Also fix pythongh-139816: an exception raised in a callback no longer stops the event loop to wait for Enter on a Python built without readline; pending callbacks keep running until input is actually available on stdin. (cherry picked from commit 3ffda34) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: mdehoon <mjldehoon@yahoo.com> Co-authored-by: Christopher Chavez <chrischavez@gmx.us> Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Jun 26, 2026
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When a Tcl command running its own event loop (such as vwait or
wait_variable) was active and the user typed input on stdin, the event
loop kept spinning at 100% CPU. The stdin file handler is now removed as
soon as input becomes available.
Also fix gh-139816: an exception raised in a callback no longer stops the
event loop to wait for Enter on a Python built without readline; pending
callbacks keep running until input is actually available on stdin.
(cherry picked from commit 3ffda34)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-authored-by: mdehoon mjldehoon@yahoo.com
Co-authored-by: Christopher Chavez chrischavez@gmx.us
Co-authored-by: Claude Opus 4.8 noreply@anthropic.com