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system/Session/Handlers/Database/MySQLiHandler.php

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+<?php
+
+declare(strict_types=1);
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Session\Handlers\Database;
+
+use CodeIgniter\Session\Handlers\DatabaseHandler;
+
+/**
+ * Session handler for MySQLi
+ *
+ * @see \CodeIgniter\Session\Handlers\Database\MySQLiHandlerTest
+ */
+class MySQLiHandler extends DatabaseHandler
+{
+    /**
+     * Lock the session.
+     */
+    protected function lockSession(string $sessionID): bool
+    {
+        $arg = md5($sessionID . ($this->matchIP ? '_' . $this->ipAddress : ''));
+        if ($this->db->query("SELECT GET_LOCK('{$arg}', 300) AS ci_session_lock")->getRow()->ci_session_lock) {
+            $this->lock = $arg;
+
+            return true;
+        }
+
+        return $this->fail();
+    }
+
+    /**
+     * Releases the lock, if any.
+     */
+    protected function releaseLock(): bool
+    {
+        if (! $this->lock) {
+            return true;
+        }
+
+        if ($this->db->query("SELECT RELEASE_LOCK('{$this->lock}') AS ci_session_lock")->getRow()->ci_session_lock) {
+            $this->lock = false;
+
+            return true;
+        }
+
+        return $this->fail();
+    }
+}