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<?php
class LOCK {
var $lockf;
var $rlock;
const BLOCK = 1; // Blocking wait or report error
const ALL = 2; // Lock for all setups or just for the current
const EXCLUSIVE = 2; // Exclusive lock
function __construct($name) {
global $TMP_PATH;
global $ADEI_SETUP;
$dir = $TMP_PATH . "/locks";
if (!is_dir($dir)) {
if (!@mkdir($dir, 0777 /*0755*/, true))
throw new ADEIException(translate("It is not possible to create lock directory \"$dir\""));
# When creating from apache, the 0777 mode is ignored for unknown reason
@chmod($dir, 0777);
}
if ($ADEI_SETUP) $fname = $dir . "/${ADEI_SETUP}__${name}.lock";
else $fname = $dir . "/ADEI__${name}.lock";
$umask = @umask(0);
$this->lockf = @fopen($fname, "a+");
if (!$this->lockf) {
@umask($umask);
throw new ADEIException(translate("It is not possible to create lock file \"$fname\""));
}
$fname = $dir . "/${name}.lock";
$this->rlock = @fopen($fname, "a+");
if (!$this->rlock) {
fclose($this->lockf);
@umask($umask);
throw new ADEIException(translate("It is not possible to create lock file \"$fname\""));
}
@umask($umask);
}
function __destruct() {
fclose($this->lockf);
fclose($this->rlock);
}
function Lock($flag = 0, $errmsg = false) {
if ($flag&LOCK::BLOCK) {
if ($flag&LOCK::ALL)
$res = flock($this->rlock, LOCK_EX);
else
$res = flock($this->rlock, LOCK_SH);
if (!$res) {
if ($errmsg) throw new ADEIException($errmsg);
else throw new ADEIException(translate("Locking is failed"));
}
$res = flock($this->lockf, LOCK_EX);
if (!$res) {
flock($this->rlock, LOCK_UN);
if ($errmsg) throw new ADEIException($errmsg);
else throw new ADEIException(translate("Locking is failed"));
}
} else {
if ($flag&LOCK::ALL)
$res = flock($this->rlock, LOCK_EX|LOCK_NB);
else
$res = flock($this->rlock, LOCK_SH|LOCK_NB);
if ((!$res)&&($errmsg)) throw new ADEIException($errmsg);
$res = flock($this->lockf, LOCK_EX|LOCK_NB);
if (!$res) {
flock($this->rlock, LOCK_UN);
if ($errmsg) throw new ADEIException($errmsg);
}
}
return $res;
}
function UnLock() {
flock($this->lockf, LOCK_UN);
flock($this->rlock, LOCK_UN);
}
}
?>
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