Quelle Collectable.java Sprache: JAVA

/*
* Copyright (c) 2019, 2022, 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
* @summary Test that virtual threads are GC'ed
* @enablePreview
* @run testng Collectable
*/

import java.lang.ref.WeakReference;
import java.util.concurrent.locks.LockSupport;

import org.testng.annotations.Test;
import static org.testng.Assert.*;

public class Collectable {

    /**
     * Test that an unstarted virtual thread can be GC"ed.
     */
    @Test
    public void testUnstartedThread() {
        var thread = Thread.ofVirtual().unstarted(() -> { });
        var ref = new WeakReference<>(thread);
        thread = null;
        waitUntilCleared(ref);
    }

    /**
     * Test that a terminated virtual thread can be GC'ed.
     */
    @Test
    public void testTerminatedThread() throws Exception {
        var thread = Thread.ofVirtual().start(() -> { });
        thread.join();
        var ref = new WeakReference<>(thread);
        thread = null;
        waitUntilCleared(ref);
    }

    private static void waitUntilCleared(WeakReference<?> ref) {
        while (ref.get() != null) {
            System.gc();
            try {
                Thread.sleep(50);
            } catch (InterruptedException ignore) { }
        }
    }
}

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