bug#36609: 27.0.50; Possible race-condition in threading implementation

[dick . r . chiang]

Four attachments:

#1. Want to revert commit 9c62ffb

0001-Revert-Fix-lock-failures-in-xg_select.patch
Description: Text Data

#2. Fails on tip of master, succeeds after patch in #1.

42.el
Description: application/emacs-lisp

#3. Abridged original example, fails after patch in #1.

report.el
Description: application/emacs-lisp

Fails not necessarily because xgselect.c is wrong, but rather because
channel-recv blocks on a mutex before channel-send can get its act together.
This was hard for all to discern because OP seemed to have gone out of his way
to obfuscate his "minimum" example.

#4. What #3 probably intended, succeeds after patch in #1.

report-2.el
Description: application/emacs-lisp