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 Basic test for jcmd Thread.vthread_summary 27 * @enablePreview 28 * @library /test/lib 29 * @run main/othervm VThreadSummaryTest 30 */ 31 32 import java.net.InetAddress; 33 import java.net.InetSocketAddress; 34 import java.net.ServerSocket; 35 import java.net.Socket; 36 import java.net.SocketTimeoutException; 37 import java.util.concurrent.CompletableFuture; 38 import java.util.concurrent.Executors; 39 import jdk.test.lib.dcmd.PidJcmdExecutor; 40 import jdk.test.lib.process.OutputAnalyzer; 41 42 public class VThreadSummaryTest { 43 public static void main(String[] args) throws Exception { 44 45 // ensure common pool is initialized 46 CompletableFuture.runAsync(() -> { }); 47 48 // ensure at least one thread pool executor and one thread-per-task executor 49 try (var pool = Executors.newFixedThreadPool(1); 50 var executor = Executors.newVirtualThreadPerTaskExecutor()) { 51 52 // ensure poller mechanism is initialized by doing blocking I/O on a virtual thread 53 executor.submit(() -> { 54 try (var listener = new ServerSocket()) { 55 InetAddress lb = InetAddress.getLoopbackAddress(); 56 listener.bind(new InetSocketAddress(lb, 0)); 57 listener.setSoTimeout(1000); 58 try { 59 Socket s = listener.accept(); 60 throw new RuntimeException("Connection from " + s + " ???"); 61 } catch (SocketTimeoutException e) { 62 // expected 63 } 64 } 65 return null; 66 }).get(); 67 68 OutputAnalyzer output = new PidJcmdExecutor().execute("Thread.vthread_summary"); 69 70 // thread groupings 71 output.shouldContain("<root>") 72 .shouldContain("java.util.concurrent.ThreadPoolExecutor") 73 .shouldContain("java.util.concurrent.ThreadPerTaskExecutor") 74 .shouldContain("ForkJoinPool.commonPool"); 75 76 // virtual thread schedulers 77 output.shouldContain("Default virtual thread scheduler:") 78 .shouldContain("Running, parallelism") 79 .shouldContain("Timeout schedulers:"); 80 81 // I/O pollers 82 output.shouldContain("Read I/O pollers:") 83 .shouldContain("Write I/O pollers:"); 84 } 85 } 86 }