1 /*
  2  * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
  3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  4  *
  5  * This code is free software; you can redistribute it and/or modify it
  6  * under the terms of the GNU General Public License version 2 only, as
  7  * published by the Free Software Foundation.
  8  *
  9  * This code is distributed in the hope that it will be useful, but WITHOUT
 10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 12  * version 2 for more details (a copy is included in the LICENSE file that
 13  * accompanied this code).
 14  *
 15  * You should have received a copy of the GNU General Public License version
 16  * 2 along with this work; if not, write to the Free Software Foundation,
 17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 18  *
 19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 20  * or visit www.oracle.com if you need additional information or have any
 21  * questions.
 22  */
 23 
 24 /**
 25  * @test
 26  * @summary Test parking when pinned and emitting the JFR VirtualThreadPinnedEvent throws
 27  * @modules java.base/jdk.internal.event
 28  * @compile/module=java.base jdk/internal/event/VirtualThreadPinnedEvent.java
 29  * @run junit VirtualThreadPinnedEventThrows
 30  */
 31 
 32 import java.lang.ref.Reference;
 33 import java.util.concurrent.atomic.AtomicBoolean;
 34 import java.util.concurrent.locks.LockSupport;
 35 import jdk.internal.event.VirtualThreadPinnedEvent;
 36 
 37 import org.junit.jupiter.api.Test;
 38 import static org.junit.jupiter.api.Assertions.*;
 39 
 40 class VirtualThreadPinnedEventThrows {
 41 
 42     /**
 43      * Test parking when pinned and creating the VirtualThreadPinnedEvent fails with OOME.
 44      */
 45     @Test
 46     void testVirtualThreadPinnedEventCreateThrows() throws Exception {
 47         VirtualThreadPinnedEvent.setCreateThrows(true);
 48         try {
 49             testParkWhenPinned();
 50         } finally {
 51             VirtualThreadPinnedEvent.setCreateThrows(false);
 52         }
 53     }
 54 
 55     /**
 56      * Test parking when pinned and VirtualThreadPinnedEvent.begin fails with OOME.
 57      */
 58     @Test
 59     void testVirtualThreadPinnedEventBeginThrows() throws Exception {
 60         VirtualThreadPinnedEvent.setBeginThrows(true);
 61         try {
 62             testParkWhenPinned();
 63         } finally {
 64             VirtualThreadPinnedEvent.setBeginThrows(false);
 65         }
 66     }
 67 
 68     /**
 69      * Test parking when pinned and VirtualThreadPinnedEvent.commit fails with OOME.
 70      */
 71     @Test
 72     void testVirtualThreadPinnedEventCommitThrows() throws Exception {
 73         VirtualThreadPinnedEvent.setCommitThrows(true);
 74         try {
 75             testParkWhenPinned();
 76         } finally {
 77             VirtualThreadPinnedEvent.setCommitThrows(false);
 78         }
 79     }
 80 
 81     /**
 82      * Test parking a virtual thread when pinned.
 83      */
 84     private void testParkWhenPinned() throws Exception {
 85         Object lock = new Object();
 86         try {
 87             var completed = new AtomicBoolean();
 88             Thread thread = Thread.startVirtualThread(() -> {
 89                 synchronized (lock) {
 90                     LockSupport.park();
 91                     completed.set(true);
 92                 }
 93             });
 94 
 95             // wait for thread to park
 96             Thread.State state;
 97             while ((state = thread.getState()) != Thread.State.WAITING) {
 98                 assertTrue(state != Thread.State.TERMINATED);
 99                 Thread.sleep(10);
100             }
101 
102             // unpark and check that thread completed without exception
103             LockSupport.unpark(thread);
104             thread.join();
105             assertTrue(completed.get());
106         } finally {
107             Reference.reachabilityFence(lock);
108         }
109     }
110 }