Bug #7634 Updated: mysql_pconnect() + lock tables can hang server

ID: 7634 Updated by: torben Reported By: torben@php.net Old Status: Feedback Status: Open Bug Type: MySQL related Operating System: Mandrake 7.0 PHP Version: 4.0 Latest CVS (03/11/2000) New Comment: Nope, still happens. This is on Debian woody, PHP 4.1.0RC3 (haven't tried on the win32 version you posted a link to, but whatever). Same script. Previous Comments: ------------------------------------------------------------------------ [2001-11-20 19:46:00] mfischer@php.net Can you try latest RC and see if the problem persists http://phpuk.org/~james/php-4.1.0RC3-win32.zip Feedback. ------------------------------------------------------------------------ [2000-11-03 21:08:24] torben@php.net I've heard about this from a couple of sources and been looking for answers, but haven't found anything definitive. I don't even know if it's solvable. However, when using persistent connections and LOCK TABLES, if for any reason the UNLOCK TABLES never gets executed, the server ends up hanging while it waits for the lock to get released. This is reproduceable for me on every version of PHP I've tried. Example script: <?php /* -*- mode: c++; minor-mode: font -*- */ error_reporting(E_ALL); $dbh = mysql_pconnect($host, $user, $pass); /* Just to test the connection. */ if ($res = mysql_db_query($db, 'show tables', $dbh)) { while ($row = mysql_fetch_array($res, MYSQL_ASSOC)) { echo $row["Tables_in_$db"] . "<br>\n"; } } echo "<hr>\n"; $table = 'category'; echo "Locking table '$table' (if the script blocks here, then the lock never got released)...<br>\n"; flush(); if ($res = mysql_db_query('chaps', "lock tables $table write", $dbh)) { echo "OK; locked.<br>\n"; } else { echo "failed; could not lock.<br>\n"; } flush(); //$res = mysql_db_query('chaps', "unlock tables", $dbh) ?> Is this just me? ------------------------------------------------------------------------ Edit this bug report at http://bugs.php.net/?id=7634&edit=1