FinalizerTest.java

/*
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 * 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. Alibaba designates this
 * particular file as subject to the "Classpath" exception as provided
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 *
 * 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.
 */

/*
 * @test
 * @summary Test unpark in a finalizer  thread.
 * @requires os.family == "linux"
 * @run main/othervm   -XX:-UseBiasedLocking -XX:+EnableCoroutine -XX:+UseWispMonitor -Dcom.alibaba.wisp.transparentWispSwitch=true FinalizerTest
 */

public class FinalizerTest {
    static final Foo lock = new Foo();
    public static void main(String[] args) throws Exception {
        new Foo();
        new Thread(() -> {
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.gc();
            System.runFinalization();
        }, "call-System.gc()").start();
        synchronized (lock) {
            lock.wait();
        }
        System.out.println(Thread.currentThread().getName() + ": wait done");
    }

    static class Foo {
        @Override
        protected void finalize() throws Throwable {
            synchronized (lock) {
                lock.notify();
            }
        }
    }
}