tree 42740714191892071ecf183c82bb90327ecc95c4
parent ef2d2340e62d7ad3207c4cdb2c9d8e31f7615f03
author Matthias Wirth <matthias.wirth@gmail.com> 1662711660 +0200
committer Willy Tarreau <w@1wt.eu> 1662714922 +0200
encoding latin1

BUG/MINOR: signals/poller: ensure wakeup from signals

Add self-wake in signal_handler() to fix a race condition with a signal
coming in between checking signal_queue_len and entering polling sleep.

The changes in commit 43c891dda ("BUG/MINOR: signals/poller: set the
poller timeout to 0 when there are signals") were insufficient.

Move the signal_queue_len check from the poll implementations to
run_poll_loop() to keep that logic in one place.

The poll loops are terminated either by the parameter wake being set or
wake up due to a write to their poller_wr_pipe by wake_thread() in
signal_handler().

This fixes issue #1841.

Must be backported in every stable version.