ID: 35894
User updated by: jik at kamens dot brookline dot ma dot us
Reported By: jik at kamens dot brookline dot ma dot us
-Status: Feedback
+Status: Open
Bug Type: IMAP related
Operating System: Linux
PHP Version: 5.1.1
New Comment:
You *don't* want to allow the simultaneous opening of a mailbox by two
processes. The whole point of locking is to *prevent* the simultaneous
opening of a mailbox by two processes. What the locking is *supposed*
to do is to make one process *wait* for the other one, but what it does
instead, if you don't catch the USR2 signal, is for the process that got
the lock first to *die* after *being killed* by the other one. This is
not correct behavior.
Incidentally, I just tested with a newly compiled c-client 2004g and
confirmed that the problem persists there without my patch.
Previous Comments:
------------------------------------------------------------------------
[2006-01-05 10:07:30] [EMAIL PROTECTED]
Why would you want to allow opening same mailbox by two simultaneous
processes?
------------------------------------------------------------------------
[2006-01-05 04:13:45] jik at kamens dot brookline dot ma dot us
Please look carefully at the output. The notices are not "harmless".
Note that the message "successfully opened mailbox" only appears
*once*. It should appear twice, because there are two processes who
both want to open the mailbox. It only appears once because one of the
two processes is killed by a USR2 signal as I've described.
I don't know why the patch I sent didn't help for you. It reliably
solves the problem for me. Perhaps I picked bad preprocessor symbols
and it's not actually getting compiled into the object code on your
system. Can you put debugging code in to see if the arm_signal calls
are actually happening?
Thanks.
------------------------------------------------------------------------
[2006-01-05 01:01:06] [EMAIL PROTECTED]
I get the same notices, which seem quite harmless anyway. And your
patch did not make any difference whatsoever.
------------------------------------------------------------------------
[2006-01-04 21:53:23] jik at kamens dot brookline dot ma dot us
libc-client-2002e-18.1 RPM from Fedora Core. I checked the current
c-client sources from washington.edu and they seem susceptible to this
problem as well, judging from an examination of the source code. The
USR2 functionality has been in c-client since 1993, as far as I can
tell.
------------------------------------------------------------------------
[2006-01-04 21:49:48] [EMAIL PROTECTED]
Exactly what c-client version you linked PHP with?
And how was it compiled?
------------------------------------------------------------------------
The remainder of the comments for this report are too long. To view
the rest of the comments, please view the bug report online at
http://bugs.php.net/35894
--
Edit this bug report at http://bugs.php.net/?id=35894&edit=1
