Bug #61369 [Fbk->NoF]: shm_put_var problem
Edit report at https://bugs.php.net/bug.php?id=61369&edit=1
ID: 61369
Updated by: php-bugs@lists.php.net
Reported by: llongo at sata-hts dot com
Summary: shm_put_var problem
-Status: Feedback
+Status: No Feedback
Type: Bug
Package: Semaphore related
Operating System: CentOS release 6.2 (Final)
PHP Version: Irrelevant
Assigned To: cmb
Private report: N
New Comment:
No feedback was provided. The bug is being suspended because
we assume that you are no longer experiencing the problem.
If this is not the case and you are able to provide the
information that was requested earlier, please do so and
change the status of the bug back to "Re-Opened". Thank you.
Previous Comments:
------------------------------------------------------------------------
[2021-07-19 11:15:50] cmb@php.net
Is this still an issue with any of the actively supported PHP
versions[1]?
[1] <https://www.php.net/supported-versions.php>
------------------------------------------------------------------------
[2013-08-13 18:40:05] igor at scalr dot com
I have the same issue on CentOS 6.X. I found that with the same version of php and
all extensions, problem exists on CentOS 6, but everything works on CentOS 5. The
only difference is kernel version, on CentOS 6 it's 2.6.32.
Any help on this issue would be appreciated, because shm functionality is critical
for our application.
------------------------------------------------------------------------
[2012-03-13 09:03:08] llongo at sata-hts dot com
I've seen the bug with php version 5.3.3 that comes with Centos 6.2 (php-5.3.3-
3.el6_2.6.x86_64). With the same version of php in Centos 5.7 (php53-5.3.3-
1.el5_7.6) the test script works in the right way.
------------------------------------------------------------------------
[2012-03-13 08:56:37] llongo at sata-hts dot com
Description:
------------
There is a problem with shm_put_var: when you call shm_put_var with a "long"
string as value (100 chars at least) in a shared memory area with some variables
already created, after updating the other variables with successive calls to
shm_put_var, this variables become non-existent and you cannot get their values
with shm_get_var.
Test script:
---------------
<?php
$key = 1000;
$test1 = "short string";
$test2 = "long string with at least 100 characters
abcdefghilmnopqrstuvzabcdefghilmnopqrstuvzabcdefghilmnopqrstuvzabcdefghilmnopqrstuvz";
$test3 = "different short string";
$res = shm_attach($key); // attach to shared memory
if (false === shm_put_var ($res,1,$test1)) { // write var 1
echo "unable to put var 1 with ".$test1."\n";
}
if (false === shm_put_var ($res,2,$test1)) { // write var 2
echo "unable to put var 2 with ".$test1."\n";
}
if (false === shm_put_var ($res,3,$test2)) { // write var 3
echo "unable to put var 3 with ".$test2."\n";
}
if (false === shm_put_var ($res,2,$test3)) { // write again var 2 => after this put var, var 2
and 3 disappear... bug?
echo "unable to put var 2 with ".$test1."\n";
}
if (false === ($var = shm_get_var ($res,2))) { // get var 2
echo "Error reading variable 2, bug!\n";
var_dump($var);
} else {
echo "variable 2: ".$var."\n";
}
shm_remove($res); // remove shared memory
shm_detach($res);
exit;
?>
Expected result:
----------------
variable 2: different short string
Actual result:
--------------
Error reading variable 2, bug!
bool(false)
And php warning:
PHP Warning: shm_get_var(): variable key 2 doesn't exist in
/root/test_bug_shm.php on line 19
------------------------------------------------------------------------
--
Edit this bug report at https://bugs.php.net/bug.php?id=61369&edit=1
Thread (5 messages)