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List: freedesktop-xcb
Subject: [Xcb] [Bug 22159] New: xorg-x11-libX11 with pthread isn't thread
From: bugzilla-daemon () freedesktop ! org
Date: 2009-06-08 17:43:18
Message-ID: bug-22159-13485 () http ! bugs ! freedesktop ! org/
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http://bugs.freedesktop.org/show_bug.cgi?id=22159
Summary: xorg-x11-libX11 with pthread isn't thread safe in
xcb_lock.c
Product: XCB
Version: unspecified
Platform: x86-64 (AMD64)
OS/Version: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Library
AssignedTo: xcb@lists.freedesktop.org
ReportedBy: gunnar@besdo.de
QAContact: xcb@lists.freedesktop.org
CC: mhopf@suse.de
Created an attachment (id=26551)
--> (http://bugs.freedesktop.org/attachment.cgi?id=26551)
Example code file for xcb_lock.c error
tested with openSUSE 11.1
I use the xorg-x11-libX11 library 7.4-1.29, glibc library 2.9-2.11.1.
One thread use the XDrawPoints function to put pixel to the window.
An other thread waits with XNextEvent for an event.
Every time I produce some events the program stops.
Reproducible: Sometimes
Steps to Reproduce:
1. translate the xcb_Test.c with gcc -o xcb_Test xcb_Test.c -pthread
-I/usr/include/X11 -lX11
2. run the program xcb_Test
3. to tap some keys
Actual Results:
Every time I produce some events the program stops with
xcb_lock.c:33: _XCBUnlockDisplay: Assertion
`xcb_get_request_sent(dpy->xcb->connection) == dpy->request' failed.
or
xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request))
>= 0)' failed.
In the xorg-x11-libX11-7.4-1.29.src.rpm is the file xcb_lock.c.
The file has a line
#include <pthread.h>
but nothing is used. I can translate the file without this line.
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