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Delayed signals in the REPL on OpenBSD (possibly libpthread related) #52960
Description
| BPO | 8714 |
|---|---|
| Nosy | @vstinner, @skrah |
Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.
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GitHub fields:
assignee = None
closed_at = <Date 2013-01-17.12:13:33.250>
created_at = <Date 2010-05-14.16:26:02.762>
labels = ['interpreter-core', 'type-bug']
title = 'Delayed signals in the REPL on OpenBSD (possibly libpthread related)'
updated_at = <Date 2013-01-17.12:13:33.249>
user = 'https://github.com/skrah'bugs.python.org fields:
activity = <Date 2013-01-17.12:13:33.249>
actor = 'skrah'
assignee = 'none'
closed = True
closed_date = <Date 2013-01-17.12:13:33.250>
closer = 'skrah'
components = ['Interpreter Core']
creation = <Date 2010-05-14.16:26:02.762>
creator = 'skrah'
dependencies = []
files = []
hgrepos = []
issue_num = 8714
keywords = []
message_count = 6.0
messages = ['105720', '106124', '140972', '141007', '141012', '180124']
nosy_count = 5.0
nosy_names = ['vstinner', 'djmdjm', 'henry.precheur', 'skrah', 'neologix']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue8714'
versions = ['Python 3.1', 'Python 2.7']
Activity
skrah commentedon May 14, 2010
On OpenBSD, SIGINT handling in the REPL is delayed until further input:
This behavior was introduced (exposed by?) r68460.
When Python is compiled without threads, the behavior is normal.
henryprecheur commentedon May 20, 2010
The bug is also present with Python 3.1 on OpenBSD 4.7-current.
neologix commentedon Jul 23, 2011
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.
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?
skrah commentedon Jul 23, 2011
I know, the OpenBSD libpthread has problems. I listed some possible
candidates in bpo-8712.
For instance:
http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/ports/lang/python/2.6/patches/Attic/patch-Lib_test_test_signal_py?rev=1.3;content-type=text%2Fplain
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.
skrah commentedon Jul 23, 2011
I forgot: readline support is enabled, and there are known problems:
http://marc.info/?t=128327329300003&r=1&w=2
skrah commentedon Jan 17, 2013
Fixed in OpenBSD 5.2.