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101 lines
3.5 KiB
PHP
101 lines
3.5 KiB
PHP
<?php
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/*
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* Created on 12.04.2008
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* Created by Hecht
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*
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* @copyright (c) 2010 animegame.eu
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* @license http://www.gnu.org/licenses/gpl-3.0.html GNU General Public Licence
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*
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*/
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/*
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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// Eine spezielle Semaphore, die sich von gewoehnlichen Semaphoren unterscheidet
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// @Returns TRUE if ok, FALSE if not, NULL on error
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$GLOBALS['semaphorecount'] = 0;
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/**
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* Tries to grab the semaphore
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* @param string $resource the name of the resource
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*/
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function semaphoreUP($resource){
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// echo 'semaphoreUp('.$resource.')<br>' . PHP_EOL ;
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if($GLOBALS['semaphorecount'] == 0){
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ignore_user_abort(true); // Verarbeitung darf NICHT abgebrochen werden!!
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// echo 'DEBUG: kritischer Bereich betreten<br>';
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}
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// Loesche alte Ressourcen
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mysql_query('DELETE FROM semaphore WHERE TIMESTAMPDIFF(MINUTE, zeit, now()) > 5 and ressource = \''.$resource.'\'');
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$sql = 'INSERT INTO semaphore(ressource) values(\''.$resource.'\')';
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mysql_query($sql);
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if(mysql_affected_rows() > 0){
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// echo 'DEBUG: Semaphore fuer '.$ressource.' belegt!('.mysql_affected_rows().')<br>';
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$GLOBALS['semaphorecount']++;
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return true;
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}
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// echo 'DEBUG:Semaphore fuer '.$ressource.' NICHT belegt!<br>';
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if($GLOBALS['semaphorecount'] == 0){
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// echo 'DEBUG: Verlassen des kritischen Bereichs<br>';
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ignore_user_abort(false); // Verarbeitung darf wieder abgebrochen werden!!
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}
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return false;
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}
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// @Returns TRUE if ok, FALSE on Semaphore error, NULL on MYQL Error
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function semaphoreDown($resource){
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$sql = 'DELETE FROM semaphore where ressource = \''.$resource.'\'';
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mysql_query($sql);
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if(mysql_affected_rows() == 0){
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// echo 'DEBUG: Semaphore '.$ressource.' war schon freigegeben<br>';
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return false;
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}
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// echo 'DEBUG: Semaphore '.$ressource.' freigegeben<br>';
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$GLOBALS['semaphorecount']--;
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if($GLOBALS['semaphorecount'] == 0){
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// echo 'DEBUG: kritischer Bereich verlassen<br>';
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ignore_user_abort(false); // Verarbeitung darf nun wieder abgebrochen werden!!
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}
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return true;
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}
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/**
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* Diese Funktion ist nur dazu da um zu pruefen ob ueberhaupt ein Lock besteht,
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* ohne die Intension die Ressource selbst zu belegen!
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* returns true, wenn Semaphore belegt ist, false wenn nicht
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*/
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function isSemaphoreUP($ressource){
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return mysql_fetch_assoc(mysql_query('Select * from semaphore where WHERE TIMESTAMPDIFF(MINUTE, zeit, now()) > 5 and ressource = \''.$ressource.'\'')) != false;
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}
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function installSemaphoreDatabase(){
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$sql1 = 'DROP TABLE `semaphore`';
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$sql2 = 'CREATE TABLE `semaphore` (' .
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'`ressource` varchar(20) NOT NULL,' .
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'`zeit` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,' .
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'PRIMARY KEY(`ressource`),' .
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'INDEX `Zeitindex`(`zeit`)' .
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')' .
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'ENGINE = MYISAM ' .
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'COMMENT = \'Die Tabelle, die hoffentlich alle Zugriffsprobleme loesen wird\'';
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mysql_query($sql1);
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mysql_query($sql2);
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}
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?>
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