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 id=default 26 * @summary Do not suspend virtual threads in a critical section. 27 * @bug 8311218 28 * @requires vm.continuations 29 * @library /testlibrary 30 * @run main/othervm SuspendWithInterruptLock 31 */ 32 33 /** 34 * @test id=xint 35 * @requires vm.debug != true 36 * @requires vm.continuations 37 * @library /testlibrary 38 * @run main/othervm -Xint SuspendWithInterruptLock 39 */ 40 41 /** 42 * @test id=xint-debug 43 * @requires vm.debug == true 44 * @requires vm.continuations 45 * @library /testlibrary 46 * @run main/othervm -Xint -XX:-VerifyContinuations SuspendWithInterruptLock 47 */ 48 49 import jvmti.JVMTIUtils; 50 51 public class SuspendWithInterruptLock { 52 static volatile boolean done; 53 54 public static void main(String[] args) throws Exception { 55 Thread yielder = Thread.ofVirtual().name("yielder").start(() -> yielder()); 56 Thread stateReader = Thread.ofVirtual().name("stateReader").start(() -> stateReader(yielder)); 57 Thread suspender = new Thread(() -> suspender(stateReader)); 58 suspender.start(); 59 60 yielder.join(); 61 stateReader.join(); 62 suspender.join(); 63 } 64 65 static private void yielder() { 66 int iterations = 100_000; 67 while (iterations-- > 0) { 68 Thread.yield(); 69 } 70 done = true; 71 } 72 73 static private void stateReader(Thread target) { 74 while (!done) { 75 target.getState(); 76 } 77 } 78 79 static private void suspender(Thread target) { 80 while (!done) { 81 suspendThread(target); 82 sleep(1); 83 resumeThread(target); 84 // Allow progress 85 sleep(5); 86 } 87 } 88 89 static void suspendThread(Thread t) { 90 try { 91 JVMTIUtils.suspendThread(t); 92 } catch (JVMTIUtils.JvmtiException e) { 93 if (e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_ALIVE) { 94 throw e; 95 } 96 } 97 } 98 99 static void resumeThread(Thread t) { 100 try { 101 JVMTIUtils.resumeThread(t); 102 } catch (JVMTIUtils.JvmtiException e) { 103 if (e.getCode() != JVMTIUtils.JVMTI_ERROR_THREAD_NOT_ALIVE) { 104 throw e; 105 } 106 } 107 } 108 109 static private void sleep(long millis) { 110 try { 111 Thread.sleep(millis); 112 } catch (InterruptedException e) {} 113 } 114 } 115