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Tracker: Bugs

3 Deadlock when python script has hook_print on DCC Chat Abort - ID: 772596

Last Update: Settings changed ( zed )

Details:

Deadlock when python script has a hook_print on "DCC
Chat Abort" and then uses xchat.command('DCC CLOSE CHAT
foo')

The attached backtrace log can be reproduced with the
attached small but functional python script in xchat
2.0.3 under linux.

When a dcc chat is open with nick and the script loaded
then
using /dccclose nick will call command "DCC CLOSE CHAT"
on nick, the problem is that the dcc abort is processed
and the script's hook on DCC CHAT Abort is called while
the DCC CLOSE command is still being processed so there
is a lock due to command while another attempt to get
the lock is made for the DCC CHAT Abort processing
causing a deadlock and hang.

Submitted:

caolan mcnamara ( caolan ) - 2003-07-16 20:47

Priority:

Status:

Closed

Resolution:

Fixed

Assigned:

Nobody/Anonymous

Category:

None

Group:

None

Visibility:

Public

Comments ( 4 )

Date: 2003-09-06 12:10 Sender: zed Logged In: YES user_id=5012 The perl plugin doesn't use any threads or locking, so I doubt it's affected. It looks like the python plugin has been orphaned.
Date: 2003-09-05 16:57 Sender: caolan Logged In: YES user_id=48034 No change I'm afraid. I wonder if the same type of deadlock affects the perl binding, or if it is a pecularity of the python plugin.
Date: 2003-08-01 09:39 Sender: zed Logged In: YES user_id=5012 Does this problem persist in 2.0.4?
Date: 2003-07-17 17:09 Sender: zed Logged In: YES user_id=5012 The Python-plugin author is: Gustavo Niemeyer <niemeyer@conectiva.com> I don't think he reads bugs here.

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Attached Files ( 2 )

Filename	Description	Download
xchat.py	sample script that shows the deadlock	Download
backtrace	backtrace on break showing attempt to gain lock while already inside python script processing	Download

Changes ( 6 )

Field	Old Value	Date	By
status_id	Open	2003-11-29 12:58	zed
close_date	-	2003-11-29 12:58	zed
resolution_id	None	2003-11-12 11:55	zed
priority	5	2003-07-16 20:49	caolan
File Added	56007: backtrace	2003-07-16 20:49	caolan
File Added	56006: xchat.py	2003-07-16 20:47	caolan

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Tracker: Bugs

Comments ( 4 )

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Attached Files ( 2 )

Changes ( 6 )

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