+<?php
+/**
+ * Provides of semaphore semantics for restricting the number
+ * of workers that may be concurrently performing the same task.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * A default PoolCounter, which provides no locking.
+ */
+class PoolCounterNull extends PoolCounter {
+
+ public function __construct() {
+ /* No parameters needed */
+ }
+
+ public function acquireForMe() {
+ return Status::newGood( PoolCounter::LOCKED );
+ }
+
+ public function acquireForAnyone() {
+ return Status::newGood( PoolCounter::LOCKED );
+ }
+
+ public function release() {
+ return Status::newGood( PoolCounter::RELEASED );
+ }
+}