Description:
------------
On RHEL(or Centos) 5.6 running any available PHP package thru RedHat and the latest version of PHP (5.3.6).

Run first script provided in a browser, then while that is running, fire up the second script. The second script will not finish until the first one calls the session_write_close() function.

Test script:
---------------
=== 1.php ===
<?php
$counter=1;
$DB= mysql_connect(localhost,$user,$pass,true);
mysql_select_db("database");

session_start();
echo "Starting...\n";
while ( $counter <= 5 ) 
{
	echo "$counter ... \n";
	sleep(2);
	$counter++;
}
echo "Done!... \n";
session_write_close();
?>

=== 2.php ===
<?php
session_start();
echo "TESTING!\n";
session_write_close();
?>

Expected result:
----------------
When both scripts are run at the same time, the second script should exit (nearly) immediately after opening a session, echoing the TESTING line, then closing the session. After the while loop is done in the first script, it should exit as expected. 

Actual result:
--------------
When the both scripts are executed at the same time (or one right after the other), the second script hangs at the 'session_start()' line until the first script is done.