Issue 8714: Delayed signals in the REPL on OpenBSD (possibly libpthread related) (original) (raw)
Created on 2010-05-14 16:26 by skrah, last changed 2022-04-11 14:57 by admin. This issue is now closed.
Messages (6)
Author: Stefan Krah (skrah) * 
Date: 2010-05-14 16:26
On OpenBSD, SIGINT handling in the REPL is delayed until further input:
Python 2.7b2+ (trunk:81162, May 14 2010, 14:47:52) [GCC 3.3.5 (propolice)] on openbsd4 Type "help", "copyright", "credits" or "license" for more information.
<= here Ctrl-C is pressed but nothing appears Only after hitting a traceback appears: Traceback (most recent call last): File "", line 1, in KeyboardInterrupt
This behavior was introduced (exposed by?) r68460.
When Python is compiled without threads, the behavior is normal.
Author: Henry Precheur (henry.precheur)
Date: 2010-05-20 01:59
The bug is also present with Python 3.1 on OpenBSD 4.7-current.
Author: Charles-François Natali (neologix) *
Date: 2011-07-23 11:08
This behavior was introduced (exposed by?) r68460.
After a quick look, I don't see anything wrong with r68460, but it might very well have exposed this problem which was lurking before.
When Python is compiled without threads, the behavior is normal.
We've already had some problems - especially on *BSD - when mixing signals and threads (and it might be even worse on OpenBSD, since pthreads are implemented in user-space). However, IIUC, in this case you only have a single thread, right?
Could you post the output of an strace (well, ktrace on OpenBSD)? Is Python compiled with readline support?
Author: Stefan Krah (skrah) *
Date: 2011-07-23 19:25
I know, the OpenBSD libpthread has problems. I listed some possible candidates in #8712.
For instance:
The comment says: "siginterrupt not reliable (does not mix well with threading"
To answer your questions:
Yes, there is only a single thread.
I only have an old OpenBSD 4.5, so it's not so useful to test there; I know Philip Guenther fixed some libpthread problems in the meantime.
Author: Stefan Krah (skrah) *
Date: 2011-07-23 19:58
I forgot: readline support is enabled, and there are known problems:
http://marc.info/?t=128327329300003&r=1&w=2
Author: Stefan Krah (skrah) *
Date: 2013-01-17 12:13
Fixed in OpenBSD 5.2.
History
Date
User
Action
Args
2022-04-11 14:57:01
admin
set
github: 52960
2013-01-17 12:13:33
skrah
set
status: open -> closed
resolution: out of date
messages: +
2011-10-17 01:07:50
vstinner
set
nosy: + vstinner
2011-07-23 19:58:55
skrah
set
messages: +
2011-07-23 19:25:57
skrah
set
messages: +
2011-07-23 11:08:23
neologix
set
nosy: + neologix
messages: +
2010-05-20 02:09:01
henry.precheur
set
versions: + Python 3.1
2010-05-20 01:59:16
henry.precheur
set
messages: +
2010-05-14 16:26:02
skrah
create