Lock.php
| 1 | <?php |
| 2 | |
| 3 | namespace JetBackup\IO; |
| 4 | |
| 5 | if (!defined( '__JETBACKUP__')) die('Direct access is not allowed'); |
| 6 | |
| 7 | class Lock { |
| 8 | |
| 9 | private static $_files; |
| 10 | |
| 11 | private static function _getFile($filename) { |
| 12 | if (!file_exists($filename)) touch($filename); |
| 13 | if (!isset(self::$_files[$filename])) self::$_files[$filename] = @fopen($filename, 'r'); |
| 14 | return self::$_files[$filename]; |
| 15 | } |
| 16 | |
| 17 | private static function _closeFile($filename) { |
| 18 | if (!isset(self::$_files[$filename])) return; |
| 19 | @fclose(self::$_files[$filename]); |
| 20 | unset(self::$_files[$filename]); |
| 21 | } |
| 22 | |
| 23 | public static function LockFile($filename, $block = false): bool { |
| 24 | if (($fd = self::_getFile($filename)) === false) return false; |
| 25 | $flag = LOCK_EX; |
| 26 | if (!$block) $flag |= LOCK_NB; |
| 27 | $wouldblock = 0; |
| 28 | $ret = flock($fd, $flag, $wouldblock); |
| 29 | if ((!$block && $wouldblock) || $ret === false) return false; |
| 30 | return true; |
| 31 | } |
| 32 | |
| 33 | public static function UnlockFile($filename) { |
| 34 | if ( |
| 35 | ($fd = self::_getFile($filename)) === false || |
| 36 | flock($fd, LOCK_UN) === false |
| 37 | ) return; |
| 38 | self::_closeFile($filename); |
| 39 | } |
| 40 | } |