94 lines
2.4 KiB
PHP
94 lines
2.4 KiB
PHP
<?php
|
|
/**
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
|
|
* License as published by the Free Software Foundation; either
|
|
* version 3 of the License, or any later version.
|
|
*
|
|
* This library 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 library. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*/
|
|
|
|
namespace OCP\Files;
|
|
use OC\Files\Filesystem;
|
|
|
|
/**
|
|
* Class Lock
|
|
* @package OC\Files
|
|
*/
|
|
class Lock {
|
|
const READ = 1;
|
|
const WRITE = 2;
|
|
|
|
/** @var string $path Filename of the file as represented in storage */
|
|
protected $path;
|
|
|
|
/** @var array $stack A stack of lock data */
|
|
protected $stack = array();
|
|
|
|
/** @var int $retries Number of lock retries to attempt */
|
|
public static $retries = 40;
|
|
|
|
/** @var int $retryInterval Milliseconds between retries */
|
|
public static $retryInterval = 50;
|
|
|
|
/**
|
|
* Constructor for the lock instance
|
|
* @param string $path Absolute pathname for a local file on which to obtain a lock
|
|
*/
|
|
public function __construct($path) {
|
|
$this->path = Filesystem::normalizePath($path);
|
|
}
|
|
|
|
/**
|
|
* @param integer $lockType A constant representing the type of lock to queue
|
|
*/
|
|
public function addLock($lockType) {
|
|
\OC_Log::write('lock', sprintf('INFO: Lock type %d requested for %s', $lockType, $this->path), \OC_Log::DEBUG);
|
|
$timeout = self::$retries;
|
|
|
|
if(!isset($this->stack[$lockType])) {
|
|
// does lockfile exist?
|
|
// yes
|
|
// Acquire exclusive lock on lockfile?
|
|
// yes
|
|
// Delete lockfile, release lock
|
|
// no
|
|
// Sleep for configurable milliseconds - start over
|
|
// no
|
|
// Acquire shared lock on original file?
|
|
// yes
|
|
// Capture handle, return for action
|
|
// no
|
|
// Sleep for configurable milliseconds - start over
|
|
$handle = 1;
|
|
|
|
$this->stack[$lockType] = array('handle' => $handle, 'count' => 0);
|
|
}
|
|
$this->stack[$lockType]['count']++;
|
|
|
|
}
|
|
|
|
/**
|
|
* Release locks on handles and files
|
|
*/
|
|
public function release($lockType) {
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Release all queued locks on the file
|
|
* @return bool
|
|
*/
|
|
public function releaseAll() {
|
|
return true;
|
|
}
|
|
|
|
} |