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/*
* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/**
* @test id=default
* @bug 8284161 8303242
* @summary Test com.sun.management.ThreadMXBean with virtual threads
* @library /test/lib
* @run junit/othervm VirtualThreads
*/
/**
* @test id=no-vmcontinuations
* @requires vm.continuations
* @library /test/lib
* @run junit/othervm -XX:+UnlockExperimentalVMOptions -XX:-VMContinuations VirtualThreads
*/
import java.lang.management.ManagementFactory;
import java.util.concurrent.locks.LockSupport;
import com.sun.management.ThreadMXBean;
import jdk.test.lib.thread.VThreadRunner;
import org.junit.jupiter.api.Test;
import static org.junit.jupiter.api.Assertions.*;
import static org.junit.jupiter.api.Assumptions.*;
public class VirtualThreads {
/**
* Test that ThreadMXBean::getCurrentThreadAllocatedBytes() returns -1 when
* invoked from a virtual thread.
*/
@Test
void testGetCurrentThreadAllocatedBytes() throws Exception {
ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
assumeTrue(bean.isThreadAllocatedMemorySupported(),
"Thread memory allocation measurement not supported");
VThreadRunner.run(() -> {
assertEquals(-1L, bean.getCurrentThreadAllocatedBytes());
});
}
/**
* Test that ThreadMXBean.getThreadAllocatedBytes(long) returns -1 when invoked
* with the thread ID of a virtual thread.
*/
@Test
void testGetThreadAllocatedBytes1() {
ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
assumeTrue(bean.isThreadAllocatedMemorySupported(),
"Thread memory allocation measurement not supported");
Thread vthread = Thread.startVirtualThread(LockSupport::park);
try {
long allocated = bean.getThreadAllocatedBytes(vthread.threadId());
assertEquals(-1L, allocated);
} finally {
LockSupport.unpark(vthread);
}
}
/**
* Test that ThreadMXBean.getThreadAllocatedBytes(long) returns -1 when invoked
* by a virtual thread with its own thread id.
*/
@Test
void testGetThreadAllocatedBytes2() throws Exception {
ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
assumeTrue(bean.isThreadAllocatedMemorySupported(),
"Thread memory allocation measurement not supported");
VThreadRunner.run(() -> {
long tid = Thread.currentThread().threadId();
long allocated = bean.getThreadAllocatedBytes(tid);
assertEquals(-1L, allocated);
});
}
/**
* Test that ThreadMXBean.getThreadAllocatedBytes(long[]) returns -1 for
* elements that correspond to a virtual thread.
*/
@Test
void testGetThreadAllocatedBytes3() {
ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
assumeTrue(bean.isThreadAllocatedMemorySupported(),
"Thread memory allocation measurement not supported");
Thread vthread = Thread.startVirtualThread(LockSupport::park);
try {
long tid0 = Thread.currentThread().threadId();
long tid1 = vthread.threadId();
long[] tids = new long[] { tid0, tid1 };
long[] allocated = bean.getThreadAllocatedBytes(tids);
if (Thread.currentThread().isVirtual()) {
assertEquals(-1L, allocated[0]);
} else {
assertTrue(allocated[0] >= 0L);
}
assertEquals(-1L, allocated[1]);
} finally {
LockSupport.unpark(vthread);
}
}
/**
* Test that ThreadMXBean.getThreadCpuTime(long[]) returns -1 for
* elements that correspond to a virtual thread.
*/
@Test
void testGetThreadCpuTime() {
ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
assumeTrue(bean.isThreadCpuTimeSupported(), "Thread CPU time measurement not supported");
Thread vthread = Thread.startVirtualThread(LockSupport::park);
try {
long tid0 = Thread.currentThread().threadId();
long tid1 = vthread.threadId();
long[] tids = new long[] { tid0, tid1 };
long[] cpuTimes = bean.getThreadCpuTime(tids);
if (Thread.currentThread().isVirtual()) {
assertEquals(-1L, cpuTimes[0]);
} else {
assertTrue(cpuTimes[0] >= 0L);
}
assertEquals(-1L, cpuTimes[1]);
} finally {
LockSupport.unpark(vthread);
}
}
/**
* Test that ThreadMXBean.getThreadUserTime(long[])returns -1 for
* elements that correspond to a virtual thread.
*/
@Test
void testGetThreadUserTime() {
ThreadMXBean bean = ManagementFactory.getPlatformMXBean(ThreadMXBean.class);
assumeTrue(bean.isThreadCpuTimeSupported(), "Thread CPU time measurement not supported");
Thread vthread = Thread.startVirtualThread(LockSupport::park);
try {
long tid0 = Thread.currentThread().threadId();
long tid1 = vthread.threadId();
long[] tids = new long[] { tid0, tid1 };
long[] userTimes = bean.getThreadUserTime(tids);
if (Thread.currentThread().isVirtual()) {
assertEquals(-1L, userTimes[0]);
} else {
assertTrue(userTimes[0] >= 0L);
}
assertEquals(-1L, userTimes[1]);
} finally {
LockSupport.unpark(vthread);
}
}
}
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