GitLab

* src/xgselect.c (release_select_lock, acquire_select_lock):
Introduce.
(xg_select): Use `acquire_select_lock', `release_select_lock'.
* src/thread.c (release_select_lock): Introduce for non-GLib builds.
(really_call_select): Call `release_select_lock'.  Simplify by
ensuring acquisition of the lock always succeeds (bug#36609).