/* * Copyright (c) 2020 Alibaba Group Holding Limited. 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. Alibaba designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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 * @library /lib/testlibrary * @summary Test to verify we can do proper wisp scheduling while calling on Unsafe.park() * @requires os.family == "linux" * @run main/othervm -XX:+EnableCoroutine -Dcom.alibaba.wisp.transparentWispSwitch=true UnsafeParkTest */ import com.alibaba.wisp.engine.WispEngine; import sun.misc.Unsafe; import java.lang.reflect.Field; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicLong; import static jdk.testlibrary.Asserts.assertTrue; public class UnsafeParkTest { public static void main(String[] args) throws Exception { Field f = Unsafe.class.getDeclaredField("theUnsafe"); f.setAccessible(true); Unsafe unsafe = (Unsafe) f.get(null); AtomicLong awake = new AtomicLong(); WispEngine.dispatch(() -> { try { Thread.sleep(300); } catch (InterruptedException e) { e.printStackTrace(); } awake.set(System.currentTimeMillis()); }); long start = System.currentTimeMillis(); unsafe.park(false, 1); unsafe.park(false, TimeUnit.MILLISECONDS.toNanos(500)); assertTrue(Math.abs(awake.get() - start - 300) < 100, "awake should be set before unsafe.park expired " + awake.get() + " " + start); } }