PHP Shared Memory (Score 1, Offtopic)

Hi!
I have a prob with shared memory in PHP and C++ I thought the /. crowd would help me...

I have a server written in C++ and my webpages are in PHP. The PHP has to communicate with the server using shared memory. This was working fine on the server running FC-1 with php-4.3.8. We recently migrated to CentOS 4.1 (Equivalent to RHEL 4.1) running php-4.3.9. The error it displays is as follows:

shmop_open(): unable to attach or create shared memory segment in /var/www/html/sharedmem.php on line 2

The server opens the shm in 666 (originally was 644) even then it was not working. I can see the shared mem open using 'ipcs' command.

The source code of PHP is as follows:

"; // These are fine

# print $shm_key;

$shm_id = shmop_open($shm_key, "a",0,0) or die("FATAL ERROR:: Unable to Access Shared Memory"); /*$shm_size = shmop_size($shm_id);
DEBUG:: print ("Shared Memory Block Size: " . $shm_size."\n");
*/ // Now lets read the string back
$data = shmop_read($shm_id, 0, $shm_size);
if (!$data) {
echo "FATAL ERROR:: Couldn't read from shared memory\n";
exit;
}
?>

Both the configs say that 'shmop' is enabled.

Can some one help me with this, I am in desperate need of this, if this fails I might have to search for an alternative and the project has to go live in a week or so. I am in desperate need of help, can any one help pls?

Regards,
Yaswanth