Bug #13490 Updated: Semaphores don't release automatically
| From: | swm@php.net | Date: | Mon, 14 Jan 2002 01:27:43 +0000 |
| Subject: | Bug #13490 Updated: Semaphores don't release automatically | ||
| References: | 1 | Groups: | php.dev |
| Request: | Send a blank email to php-dev+get-76951@lists.php.net to get a copy of this message | ||
ID: 13490
Updated by: swm
Old Summary: Semaphores don't release automatically
Reported By: m@savich.ru
Old Status: Closed
Status: Open
Bug Type: Semaphore related
Operating System: FreeBSD 4.1.1
PHP Version: 4.0.6
New Comment:
My bad. Re-opened.
Previous Comments:
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[2002-01-13 14:52:51] m@savich.ru
http://www.php.net/manual/ru/function.sem-acquire.php:
"After processing a request, any semaphores acquired by the process but
not explicitly released will be released automatically and a warning
will be generated."
Therefore, it is NOT intended behaviour, because in my situation
semaphores DON'T release automatically. And any failure in php script
causes apache to hang up in few seconds, because semaphore is acquired
by dead script and all other instances can't work. This really is bug.
:-(
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[2002-01-13 08:35:48] swm@php.net
This is intended behaviour. This is how semaphores work. =)
Use sem_remove() to remove semaphores.
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[2001-09-28 19:03:32] m@savich.ru
simplest script:
<?
$id = sem_get(0xff03e3);
sem_acquire($id);
?>
modules:
'./configure' '--with-apxs=/usr/local/apache/bin/apxs' '--with-mysql'
'--enable-sysvsem' '--enable-sysvshm' '--enable-track-vars'
'--enable-sockets'
description:
When i run that script for the first time, warning doesnt appear, as it
is described in manual. All the other calls hang apache processes
without any chance for semaphore to unlock.
However, if i try such variant:
<?
set_time_limit(0);
$id = sem_get(0xff03e3);
sem_acquire($id);
sleep(1);
sem_release($id);
?>
everything works perfectly for single calls, but when I run my
crash-test, which calls the php script 200 times at once, it hangs the
semaphore again and many apache processes stay frozen.
I think, the reason is incorrect request finalization.
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Edit this bug report at http://bugs.php.net/?id=13490&edit=1