/**
* Generates a lock filename using an MD5 hash of the `$id` and
* `$path`. Lock files are given a .lock extension
*
* @param string $id
* The name of the lock file to be obfuscated
* @param string $path
* The path the lock should be written
* @return string
*/
private static function __generateLockFileName($id, $path = null)
{
// This function is called from all others, so it is a good point to initialize Mutex handling.
if (!is_array(self::$lockFiles)) {
self::$lockFiles = array();
register_shutdown_function(array(__CLASS__, '__shutdownCleanup'));
}
if (is_null($path)) {
$path = sys_get_temp_dir();
}
// Use realpath, because shutdown function may operate in different working directory.
// So we need to be sure that path is absolute.
return rtrim(realpath($path), '/') . '/' . md5($id) . '.lock';
}
