user/dev discussion of public-inbox itself
 help / color / mirror / code / Atom feed
From: Eric Wong <e@80x24.org>
To: meta@public-inbox.org
Subject: [PATCH 10/11] lei: use sleep(1) loop for infinite sleep
Date: Tue,  2 Feb 2021 22:11:42 -1000	[thread overview]
Message-ID: <20210203081143.24424-11-e@80x24.org> (raw)
In-Reply-To: <20210203081143.24424-1-e@80x24.org>

Perl may internally race and miss signals due to a lack of
self-pipe / eventfd / signalfd / EVFILT_SIGNAL usage.  While our
event loop paths avoid these problems by using signalfd or
EVFILT_SIGNAL, thse sleep() calls are not within the event loop.
---
 lib/PublicInbox/LEI.pm | 2 +-
 script/lei             | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/LEI.pm b/lib/PublicInbox/LEI.pm
index 005f6f7a..28dce0c5 100644
--- a/lib/PublicInbox/LEI.pm
+++ b/lib/PublicInbox/LEI.pm
@@ -299,7 +299,7 @@ sub x_it ($$) {
 		if (my $signum = ($code & 127)) { # usually SIGPIPE (13)
 			$SIG{PIPE} = 'DEFAULT'; # $SIG{$signum} doesn't work
 			kill $signum, $$;
-			sleep; # wait for signal
+			sleep(1) while 1; # wait for signal
 		} else {
 			$quit->($code >> 8);
 		}
diff --git a/script/lei b/script/lei
index 58f0dbe9..40c21ad8 100755
--- a/script/lei
+++ b/script/lei
@@ -116,7 +116,7 @@ Falling back to (slow) one-shot mode
 	sigchld();
 	if (my $sig = ($x_it_code & 127)) {
 		kill $sig, $$;
-		sleep;
+		sleep(1) while 1;
 	}
 	exit($x_it_code >> 8);
 } else { # for systems lacking Socket::MsgHdr or Inline::C

  parent reply	other threads:[~2021-02-03  8:11 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-03  8:11 [PATCH 00/11] lei q --stdin, shortcut names, etc Eric Wong
2021-02-03  8:11 ` [PATCH 01/11] lei: reduce FD pressure from lei2mail worker Eric Wong
2021-02-03  8:11 ` [PATCH 02/11] lei: further reduce lei2mail FD pressure Eric Wong
2021-02-03  8:11 ` [PATCH 03/11] pkt_op: rely on DS::in_loop global Eric Wong
2021-02-03  8:11 ` [PATCH 04/11] lei: err: avoid uninitialized variable warnings Eric Wong
2021-02-03  8:11 ` [PATCH 05/11] lei: propagate curl errors, improve internal consistency Eric Wong
2021-02-03  8:11 ` [PATCH 06/11] lei q: -I/--exclude/--only support globs and basenames Eric Wong
2021-02-03  8:11 ` [PATCH 07/11] lei: complete basenames for include|exclude|only Eric Wong
2021-02-03  8:11 ` [PATCH 08/11] lei: help starts pager Eric Wong
2021-02-03  8:11 ` [PATCH 09/11] lei add-external: completion for existing URL basenames Eric Wong
2021-02-03  8:11 ` Eric Wong [this message]
2021-02-03  8:11 ` [PATCH 11/11] lei q: support reading queries from stdin Eric Wong

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://public-inbox.org/README

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210203081143.24424-11-e@80x24.org \
    --to=e@80x24.org \
    --cc=meta@public-inbox.org \
    --subject='Re: [PATCH 10/11] lei: use sleep(1) loop for infinite sleep' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Code repositories for project(s) associated with this inbox:

	https://80x24.org/public-inbox.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).