67 lines
2.4 KiB
Java
67 lines
2.4 KiB
Java
/*
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* Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/**
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* @test
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* @summary Basic test of debugging option to trace pinned threads
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* @requires vm.continuations
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* @compile --enable-preview -source ${jdk.version} TracePinnedThreads.java
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* @run main/othervm --enable-preview -Djdk.tracePinnedThreads=full TracePinnedThreads
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* @run main/othervm --enable-preview -Djdk.tracePinnedThreads=short TracePinnedThreads
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*/
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import java.io.ByteArrayOutputStream;
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import java.io.PrintStream;
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import java.time.Duration;
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import java.util.concurrent.locks.LockSupport;
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public class TracePinnedThreads {
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static final Object lock = new Object();
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public static void main(String[] args) throws Exception {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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PrintStream original = System.out;
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System.setOut(new PrintStream(baos));
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try {
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Thread.ofVirtual().start(() -> {
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synchronized (lock) {
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long nanos = Duration.ofSeconds(1).toNanos();
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LockSupport.parkNanos(nanos);
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}
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}).join();
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System.out.flush();
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} finally {
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System.setOut(original);
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}
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String output = new String(baos.toByteArray()); // default charset
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System.out.println(output);
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String expected = "<== monitors:1";
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if (!output.contains(expected)) {
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throw new RuntimeException("expected: \"" + expected + "\"");
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}
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}
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}
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