/*
* Copyright ( c ) 2012 , 2013 , Oracle and / or its affiliates . All rights reserved .
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER .
*
* This code is free software ; you can redistribute it and / or modify it
* under the terms of the GNU General Public License version 2 only , as
* published by the Free Software Foundation .
*
* This code is distributed in the hope that it will be useful , but WITHOUT
* ANY WARRANTY ; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE . See the GNU General Public License
* version 2 for more details ( a copy is included in the LICENSE file that
* accompanied this code ) .
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work ; if not , write to the Free Software Foundation ,
* Inc . , 51 Franklin St , Fifth Floor , Boston , MA 02110 - 1301 USA .
*
* Please contact Oracle , 500 Oracle Parkway , Redwood Shores , CA 94065 USA
* or visit www . oracle . com if you need additional information or have any
* questions .
*/
/*
* @ test
* @ bug 7190310
* @ summary Inlining WeakReference . get ( ) , and hoisting $ referent may lead to non - terminating loops
*
* @ run main / othervm / timeout = 600 - Xbatch compiler . c2 . Test7190310
*/
/*
* Note bug exhibits as infinite loop , timeout is helpful .
* It should normally finish pretty quickly , but on some especially slow machines
* it may not . The companion _ unsafe test lacks a timeout , but that is okay .
*/
package compiler.c2;
import java.lang.ref.Reference;
import java.lang.ref.ReferenceQueue;
import java.lang.ref.WeakReference;
public class Test7190310 {
private static Object str = new Object() {
public String toString() {
return "The Object" ;
}
protected void finalize() throws Throwable {
System.out.println("The Object is being finalized" );
super .finalize();
}
};
private final static ReferenceQueue<Object> rq =
new ReferenceQueue<Object>();
private final static WeakReference<Object> wr =
new WeakReference<Object>(str, rq);
public static void main(String[] args)
throws InterruptedException {
Thread reader = new Thread () {
public void run() {
while (wr.get() != null ) {
}
System.out.println("wr.get() returned null" );
}
};
Thread queueReader = new Thread () {
public void run() {
try {
Reference<? extends Object> ref = rq.remove();
System.out.println(ref);
System.out.println("queueReader returned, ref==wr is "
+ (ref == wr));
} catch (InterruptedException e) {
System.err.println("Sleep interrupted - exiting" );
}
}
};
reader.start();
queueReader.start();
Thread .sleep(1000 );
str = null ;
System.gc();
}
}
Messung V0.5 in Prozent C=97 H=64 G=81
¤ Dauer der Verarbeitung: 0.14 Sekunden
(vorverarbeitet am 2026-10-01)
¤
*© Formatika GbR, Deutschland