/usr/share/z-push/lib/default/simplemutex.php is in z-push-common 2.3.8-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/***********************************************
* File : simplemutex.php
* Project : Z-Push
* Descr : Implements a simple mutex using InterProcessData
*
* Created : 29.02.2012
*
* Copyright 2007 - 2016 Zarafa Deutschland GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Consult LICENSE file for details
************************************************/
class SimpleMutex extends InterProcessData {
/**
* Constructor
*/
public function __construct() {
// initialize super parameters
$this->allocate = 64;
$this->type = 5173;
parent::__construct();
if (!$this->IsActive()) {
ZLog::Write(LOGLEVEL_ERROR, "SimpleMutex not available as InterProcessData is not available. This is not recommended on duty systems and may result in corrupt user/device linking.");
}
}
/**
* Blocks the mutex.
* Method blocks until mutex is available!
* ATTENTION: make sure that you *always* release a blocked mutex!
*
* @access public
* @return boolean
*/
public function Block() {
if ($this->IsActive())
return $this->blockMutex();
ZLog::Write(LOGLEVEL_WARN, "Could not enter mutex as InterProcessData is not available. This is not recommended on duty systems and may result in corrupt user/device linking!");
return true;
}
/**
* Releases the mutex
* After the release other processes are able to block the mutex themselves.
*
* @access public
* @return boolean
*/
public function Release() {
if ($this->IsActive())
return $this->releaseMutex();
return true;
}
}
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