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products/Sources/formale Sprachen/Java/Openjdk/test/jdk/java/lang/ThreadLocal/ (Sun/Oracle ^©) Datei vom 13.11.2022 mit Größe 2 kB

Quelle InitialValue.java Sprache: JAVA

/*
* Copyright (c) 2005, 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     5025230
* @summary Tests to see that a set nested in initialValue works OK
* @author  Pete Soper
*/
public class InitialValue implements Runnable {

    static ThreadLocal<String> other;
    static boolean passed;

    public class MyLocal extends ThreadLocal<String> {
        String val;
        protected String initialValue() {
            other = new ThreadLocal<String>();
            // This should reuse the map that the containing get() created
            // or visa versa (i.e. instead of a second map being created).
            other.set("Other");
            return "Initial";
        }
    }

    public void run() {
        MyLocal l = new MyLocal();
        // This should pick up the initial value
        String s1 = l.get();
        // And this should pick up the other local in this thread's locals map
        String s2 = other.get();
        if ((s2 != null) && s2.equals("Other")) {
            // JMM guarantees this will be visible to
            // another thread joining with this thread's
            // termination: no need for this to be volatile.
            passed = true;
        }
    }

    public static void main(String[] args) {
        // Starting with Mustang the main thread already has an initialized
        // ThreadLocal map at this point, so test with a second thread.
        Thread t = new Thread(new InitialValue());
        t.start();
        try {
            t.join();
        } catch (InterruptedException e) {
            throw new RuntimeException("Test Interrupted: failed");
        }
        if (!passed) {
            throw new RuntimeException("Test Failed");
        }
    }
}

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