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and subject line #66848: xlibs: Multithreading problem in xlibs
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Date: Fri, 7 Jul 2000 08:43:38 +0400
From: Dmitry Potapov <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Multithreading problem in xlib6g
Message-ID: <[EMAIL PROTECTED]>
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Package: xlib6g
Version: 3.3.6-8
I discover this problem when use Netscape.
Some time Netscape hang with 100% CPU usage.
I look on code and find that it make infinity loop
inside XlibInc.c file:
#ifdef XTHREADS
while (dpy->flags & XlibDisplayWriting) {
ConditionWait(dpy, dpy->lock->writers);
}
#endif
where ConditionWait defined in locking.h as
#define ConditionWait(d,c) if ((d)->lock) \
(*(d)->lock->condition_wait)(c, (d)->lock->mutex)
So when (d)->lock is null then program have no chance to
leave while loop.
This problem already fixed more new version of X11
(at least in 4.0.1). So there is patch:
--- XlibInt.c.orig Sat Jul 1 14:17:42 2000
+++ XlibInt.c Fri Jul 7 08:09:53 2000
@@ -605,7 +605,11 @@
}
#ifdef XTHREADS
while (dpy->flags & XlibDisplayWriting) {
- ConditionWait(dpy, dpy->lock->writers);
+ if (dpy->lock) {
+ ConditionWait(dpy, dpy->lock->writers);
+ } else {
+ _XWaitForWritable (dpy, cv);
+ }
}
#endif
size = todo = dpy->bufptr - dpy->buffer;
Thanks,
Dmitry
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Received: (at 66848-done) by bugs.debian.org; 2 Sep 2003 10:48:43 +0000
>From [EMAIL PROTECTED] Tue Sep 02 05:48:41 2003
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Date: Tue, 2 Sep 2003 05:48:40 -0500
From: Branden Robinson <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: Re: #66848: xlibs: Multithreading problem in xlibs
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This bug was fixed upstream a while ago.
An inspection of the source reveals that it is certainly fixed in
XFree86 4.2.1, currently in Debian testing and unstable.
Closing this bug.
--=20
G. Branden Robinson | A celibate clergy is an especially
Debian GNU/Linux | good idea, because it tends to
[EMAIL PROTECTED] | suppress any hereditary propensity
http://people.debian.org/~branden/ | toward fanaticism. -- Carl Sagan
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