CB24Updater::Lock

public function Lock()
{
	global $DB;

	$uniq = $this->serverUniqID;

	if ($DB->type == "MYSQL")
	{
		$dbLock = $DB->Query("SELECT GET_LOCK('".$uniq."_DBUpdater', 0) as L", false, "File: ".__FILE__."
Line: ".__LINE__);
		$arLock = $dbLock->Fetch();
		if ($arLock["L"] == "1")
			return true;
		else
			return false;
	}
	elseif ($DB->type == "ORACLE")
	{
		$dbLock = $DB->Query("
			declare
				my_lock_id number;
				my_result number;
				lock_failed exception;
				pragma exception_init(lock_failed, -54);
			begin
				my_lock_id:=dbms_utility.get_hash_value(to_char('".$uniq."_DBUpdater'), 0, 1024);
				my_result:=dbms_lock.request(my_lock_id, dbms_lock.x_mode, 0, true);
				--  Return value:
				--    0 - success
				--    1 - timeout
				--    2 - deadlock
				--    3 - parameter error
				--    4 - already own lock specified by 'id' or 'lockhandle'
				--    5 - illegal lockhandle
				if(my_result<>0 and my_result<>4)then
					raise lock_failed;
				end if;
			end;
		", true);
		return ($dbLock !== false);
	}
	else
	{
		$i = 60;
		$DB->Query("DELETE FROM b_option WHERE MODULE_ID = 'main' AND NAME = '".$uniq."_DBUpdater' AND SITE_ID IS NULL AND DATEDIFF(SECOND, CONVERT(DATETIME, DESCRIPTION), GETDATE()) > ".$i, false, "File: ".__FILE__."
Line: ".__LINE__);
		$DB->Query("SET LOCK_TIMEOUT 1", false, "File: ".__FILE__."
Line: ".__LINE__);
		$dbLock = $DB->Query("INSERT INTO b_option(MODULE_ID, NAME, SITE_ID, VALUE, DESCRIPTION) VALUES ('main', '".$uniq."_DBUpdater', NULL,  NULL, CONVERT(VARCHAR(128), GETDATE()))", true);
		$DB->Query("SET LOCK_TIMEOUT -1", false, "File: ".__FILE__."
Line: ".__LINE__);
		return ($dbLock !== false);
	}
}