117 lines
3.7 KiB
Java
117 lines
3.7 KiB
Java
/*
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* Copyright (c) 2020, 2023, 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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* @bug 8284161 8289284
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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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* @library /test/lib
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* @run junit/othervm -Djdk.tracePinnedThreads=full TracePinnedThreads
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* @run junit/othervm -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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import jdk.test.lib.thread.VThreadRunner;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.*;
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class TracePinnedThreads {
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static final Object lock = new Object();
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/**
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* Parks current thread for 1 second.
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*/
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private static void park() {
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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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/**
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* Invokes the park method through a native frame to park the current
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* thread for 1 second.
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*/
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private static native void invokePark();
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/**
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* Test parking inside synchronized block.
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*/
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@Test
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void testPinnedCausedBySynchronizedBlock() throws Exception {
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String output = run(() -> {
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synchronized (lock) {
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park();
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}
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});
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assertContains(output, "<== monitors:1");
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assertDoesNotContain(output, "(Native Method)");
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}
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/**
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* Test parking with native frame on stack.
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*/
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@Test
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void testPinnedCausedByNativeMethod() throws Exception {
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System.loadLibrary("TracePinnedThreads");
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String output = run(() -> invokePark());
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assertContains(output, "(Native Method)");
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assertDoesNotContain(output, "<== monitors");
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}
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/**
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* Run a task in a virtual thread, returning a String with any output printed
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* to standard output.
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*/
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private static String run(Runnable task) 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, true));
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try {
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VThreadRunner.run(task::run);
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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());
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System.out.println(output);
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return output;
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}
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/**
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* Tests that s1 contains s2.
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*/
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private static void assertContains(String s1, String s2) {
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assertTrue(s1.contains(s2), s2 + " not found!!!");
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}
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/**
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* Tests that s1 does not contain s2.
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*/
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private static void assertDoesNotContain(String s1, String s2) {
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assertFalse(s1.contains(s2), s2 + " found!!");
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}
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}
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