1 /*
  2  * Copyright (c) 2023, 2024, 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/java.lang:+open java.base/jdk.internal.event
 28  * @library /test/lib
 29  * @compile/module=java.base jdk/internal/event/VirtualThreadPinnedEvent.java
 30  * @run junit/othervm --enable-native-access=ALL-UNNAMED VirtualThreadPinnedEventThrows
 31  */
 32 
 33 import java.lang.ref.Reference;
 34 import java.util.concurrent.atomic.AtomicBoolean;
 35 import java.util.concurrent.atomic.AtomicReference;
 36 import java.util.concurrent.locks.LockSupport;
 37 import jdk.internal.event.VirtualThreadPinnedEvent;
 38 
 39 import jdk.test.lib.thread.VThreadRunner;
 40 import jdk.test.lib.thread.VThreadPinner;
 41 import org.junit.jupiter.api.Test;
 42 import org.junit.jupiter.api.BeforeAll;
 43 import static org.junit.jupiter.api.Assertions.*;
 44 
 45 class VirtualThreadPinnedEventThrows {
 46 
 47     @BeforeAll
 48     static void setup() {
 49         // need >=2 carriers for testing pinning when main thread is a virtual thread
 50         if (Thread.currentThread().isVirtual()) {
 51             VThreadRunner.ensureParallelism(2);
 52         }
 53     }
 54 
 55     /**
 56      * Test parking when pinned and creating the VirtualThreadPinnedEvent fails with OOME.
 57      */
 58     @Test
 59     void testVirtualThreadPinnedEventCreateThrows() throws Exception {
 60         VirtualThreadPinnedEvent.setCreateThrows(true);
 61         try {
 62             testParkWhenPinned();
 63         } finally {
 64             VirtualThreadPinnedEvent.setCreateThrows(false);
 65         }
 66     }
 67 
 68     /**
 69      * Test parking when pinned and VirtualThreadPinnedEvent.begin fails with OOME.
 70      */
 71     @Test
 72     void testVirtualThreadPinnedEventBeginThrows() throws Exception {
 73         VirtualThreadPinnedEvent.setBeginThrows(true);
 74         try {
 75             testParkWhenPinned();
 76         } finally {
 77             VirtualThreadPinnedEvent.setBeginThrows(false);
 78         }
 79     }
 80 
 81     /**
 82      * Test parking when pinned and VirtualThreadPinnedEvent.commit fails with OOME.
 83      */
 84     @Test
 85     void testVirtualThreadPinnedEventCommitThrows() throws Exception {
 86         VirtualThreadPinnedEvent.setCommitThrows(true);
 87         try {
 88             testParkWhenPinned();
 89         } finally {
 90             VirtualThreadPinnedEvent.setCommitThrows(false);
 91         }
 92     }
 93 
 94     /**
 95      * Test parking a virtual thread when pinned.
 96      */
 97     private void testParkWhenPinned() throws Exception {
 98         var exception = new AtomicReference<Throwable>();
 99         var done = new AtomicBoolean();
100         Thread thread = Thread.startVirtualThread(() -> {
101             try {
102                 VThreadPinner.runPinned(() -> {
103                     while (!done.get()) {
104                         LockSupport.park();
105                     }
106                 });
107             } catch (Throwable e) {
108                 exception.set(e);
109             }
110         });
111         try {
112             // wait for thread to park
113             Thread.State state;
114             while ((state = thread.getState()) != Thread.State.WAITING) {
115                 assertTrue(state != Thread.State.TERMINATED);
116                 Thread.sleep(10);
117             }
118         } finally {
119             done.set(true);
120             LockSupport.unpark(thread);
121             thread.join();
122         }
123         assertNull(exception.get());
124     }
125 }