mirror of
https://github.com/openjdk/jdk.git
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96d0817455
Added two new API's to limit the stack trace depth Reviewed-by: mchung, dfuchs, rriggs, egahlin
535 lines
17 KiB
Java
535 lines
17 KiB
Java
/*
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* Copyright (c) 2003, 2017, 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. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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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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package sun.management;
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.lang.management.ThreadMXBean;
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import javax.management.ObjectName;
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/**
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* Implementation for java.lang.management.ThreadMXBean as well as providing the
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* supporting method for com.sun.management.ThreadMXBean.
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* The supporting method for com.sun.management.ThreadMXBean can be moved to
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* jdk.management in the future.
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*/
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public class ThreadImpl implements ThreadMXBean {
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private final VMManagement jvm;
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// default for thread contention monitoring is disabled.
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private boolean contentionMonitoringEnabled = false;
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private boolean cpuTimeEnabled;
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private boolean allocatedMemoryEnabled;
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/**
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* Constructor of ThreadImpl class.
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*/
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protected ThreadImpl(VMManagement vm) {
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this.jvm = vm;
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this.cpuTimeEnabled = jvm.isThreadCpuTimeEnabled();
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this.allocatedMemoryEnabled = jvm.isThreadAllocatedMemoryEnabled();
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}
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@Override
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public int getThreadCount() {
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return jvm.getLiveThreadCount();
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}
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@Override
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public int getPeakThreadCount() {
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return jvm.getPeakThreadCount();
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}
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@Override
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public long getTotalStartedThreadCount() {
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return jvm.getTotalThreadCount();
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}
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@Override
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public int getDaemonThreadCount() {
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return jvm.getDaemonThreadCount();
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}
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@Override
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public boolean isThreadContentionMonitoringSupported() {
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return jvm.isThreadContentionMonitoringSupported();
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}
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@Override
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public synchronized boolean isThreadContentionMonitoringEnabled() {
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if (!isThreadContentionMonitoringSupported()) {
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throw new UnsupportedOperationException(
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"Thread contention monitoring is not supported.");
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}
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return contentionMonitoringEnabled;
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}
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@Override
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public boolean isThreadCpuTimeSupported() {
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return jvm.isOtherThreadCpuTimeSupported();
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}
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@Override
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public boolean isCurrentThreadCpuTimeSupported() {
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return jvm.isCurrentThreadCpuTimeSupported();
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}
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protected boolean isThreadAllocatedMemorySupported() {
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return jvm.isThreadAllocatedMemorySupported();
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}
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@Override
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public boolean isThreadCpuTimeEnabled() {
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if (!isThreadCpuTimeSupported() &&
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!isCurrentThreadCpuTimeSupported()) {
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throw new UnsupportedOperationException(
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"Thread CPU time measurement is not supported");
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}
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return cpuTimeEnabled;
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}
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protected boolean isThreadAllocatedMemoryEnabled() {
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if (!isThreadAllocatedMemorySupported()) {
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throw new UnsupportedOperationException(
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"Thread allocated memory measurement is not supported");
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}
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return allocatedMemoryEnabled;
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}
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@Override
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public long[] getAllThreadIds() {
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Util.checkMonitorAccess();
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Thread[] threads = getThreads();
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int length = threads.length;
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long[] ids = new long[length];
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for (int i = 0; i < length; i++) {
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Thread t = threads[i];
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ids[i] = t.getId();
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}
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return ids;
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}
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@Override
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public ThreadInfo getThreadInfo(long id) {
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long[] ids = new long[1];
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ids[0] = id;
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final ThreadInfo[] infos = getThreadInfo(ids, 0);
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return infos[0];
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}
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@Override
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public ThreadInfo getThreadInfo(long id, int maxDepth) {
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long[] ids = new long[1];
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ids[0] = id;
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final ThreadInfo[] infos = getThreadInfo(ids, maxDepth);
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return infos[0];
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}
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@Override
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public ThreadInfo[] getThreadInfo(long[] ids) {
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return getThreadInfo(ids, 0);
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}
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private void verifyThreadIds(long[] ids) {
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if (ids == null) {
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throw new NullPointerException("Null ids parameter.");
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}
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for (int i = 0; i < ids.length; i++) {
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if (ids[i] <= 0) {
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throw new IllegalArgumentException(
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"Invalid thread ID parameter: " + ids[i]);
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}
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}
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}
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@Override
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public ThreadInfo[] getThreadInfo(long[] ids, int maxDepth) {
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verifyThreadIds(ids);
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if (maxDepth < 0) {
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throw new IllegalArgumentException(
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"Invalid maxDepth parameter: " + maxDepth);
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}
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// ids has been verified to be non-null
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// an empty array of ids should return an empty array of ThreadInfos
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if (ids.length == 0) return new ThreadInfo[0];
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Util.checkMonitorAccess();
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ThreadInfo[] infos = new ThreadInfo[ids.length]; // nulls
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if (maxDepth == Integer.MAX_VALUE) {
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getThreadInfo1(ids, -1, infos);
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} else {
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getThreadInfo1(ids, maxDepth, infos);
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}
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return infos;
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}
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@Override
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public void setThreadContentionMonitoringEnabled(boolean enable) {
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if (!isThreadContentionMonitoringSupported()) {
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throw new UnsupportedOperationException(
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"Thread contention monitoring is not supported");
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}
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Util.checkControlAccess();
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synchronized (this) {
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if (contentionMonitoringEnabled != enable) {
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if (enable) {
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// if reeabled, reset contention time statistics
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// for all threads
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resetContentionTimes0(0);
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}
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// update the VM of the state change
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setThreadContentionMonitoringEnabled0(enable);
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contentionMonitoringEnabled = enable;
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}
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}
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}
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private boolean verifyCurrentThreadCpuTime() {
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// check if Thread CPU time measurement is supported.
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if (!isCurrentThreadCpuTimeSupported()) {
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throw new UnsupportedOperationException(
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"Current thread CPU time measurement is not supported.");
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}
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return isThreadCpuTimeEnabled();
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}
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@Override
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public long getCurrentThreadCpuTime() {
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if (verifyCurrentThreadCpuTime()) {
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return getThreadTotalCpuTime0(0);
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}
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return -1;
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}
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@Override
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public long getThreadCpuTime(long id) {
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long[] ids = new long[1];
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ids[0] = id;
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final long[] times = getThreadCpuTime(ids);
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return times[0];
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}
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private boolean verifyThreadCpuTime(long[] ids) {
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verifyThreadIds(ids);
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// check if Thread CPU time measurement is supported.
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if (!isThreadCpuTimeSupported() &&
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!isCurrentThreadCpuTimeSupported()) {
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throw new UnsupportedOperationException(
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"Thread CPU time measurement is not supported.");
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}
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if (!isThreadCpuTimeSupported()) {
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// support current thread only
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for (int i = 0; i < ids.length; i++) {
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if (ids[i] != Thread.currentThread().getId()) {
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throw new UnsupportedOperationException(
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"Thread CPU time measurement is only supported" +
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" for the current thread.");
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}
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}
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}
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return isThreadCpuTimeEnabled();
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}
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protected long[] getThreadCpuTime(long[] ids) {
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boolean verified = verifyThreadCpuTime(ids);
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int length = ids.length;
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long[] times = new long[length];
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java.util.Arrays.fill(times, -1);
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if (verified) {
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if (length == 1) {
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long id = ids[0];
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if (id == Thread.currentThread().getId()) {
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id = 0;
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}
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times[0] = getThreadTotalCpuTime0(id);
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} else {
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getThreadTotalCpuTime1(ids, times);
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}
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}
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return times;
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}
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@Override
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public long getCurrentThreadUserTime() {
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if (verifyCurrentThreadCpuTime()) {
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return getThreadUserCpuTime0(0);
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}
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return -1;
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}
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@Override
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public long getThreadUserTime(long id) {
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long[] ids = new long[1];
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ids[0] = id;
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final long[] times = getThreadUserTime(ids);
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return times[0];
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}
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protected long[] getThreadUserTime(long[] ids) {
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boolean verified = verifyThreadCpuTime(ids);
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int length = ids.length;
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long[] times = new long[length];
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java.util.Arrays.fill(times, -1);
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if (verified) {
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if (length == 1) {
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long id = ids[0];
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if (id == Thread.currentThread().getId()) {
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id = 0;
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}
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times[0] = getThreadUserCpuTime0(id);
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} else {
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getThreadUserCpuTime1(ids, times);
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}
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}
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return times;
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}
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@Override
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public void setThreadCpuTimeEnabled(boolean enable) {
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if (!isThreadCpuTimeSupported() &&
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!isCurrentThreadCpuTimeSupported()) {
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throw new UnsupportedOperationException(
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"Thread CPU time measurement is not supported");
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}
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Util.checkControlAccess();
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synchronized (this) {
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if (cpuTimeEnabled != enable) {
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// notify VM of the state change
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setThreadCpuTimeEnabled0(enable);
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cpuTimeEnabled = enable;
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}
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}
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}
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protected long getThreadAllocatedBytes(long id) {
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long[] ids = new long[1];
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ids[0] = id;
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final long[] sizes = getThreadAllocatedBytes(ids);
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return sizes[0];
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}
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private boolean verifyThreadAllocatedMemory(long[] ids) {
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verifyThreadIds(ids);
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// check if Thread allocated memory measurement is supported.
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if (!isThreadAllocatedMemorySupported()) {
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throw new UnsupportedOperationException(
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"Thread allocated memory measurement is not supported.");
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}
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return isThreadAllocatedMemoryEnabled();
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}
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protected long[] getThreadAllocatedBytes(long[] ids) {
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boolean verified = verifyThreadAllocatedMemory(ids);
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long[] sizes = new long[ids.length];
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java.util.Arrays.fill(sizes, -1);
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if (verified) {
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getThreadAllocatedMemory1(ids, sizes);
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}
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return sizes;
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}
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protected void setThreadAllocatedMemoryEnabled(boolean enable) {
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if (!isThreadAllocatedMemorySupported()) {
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throw new UnsupportedOperationException(
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"Thread allocated memory measurement is not supported.");
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}
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Util.checkControlAccess();
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synchronized (this) {
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if (allocatedMemoryEnabled != enable) {
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// notify VM of the state change
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setThreadAllocatedMemoryEnabled0(enable);
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allocatedMemoryEnabled = enable;
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}
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}
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}
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@Override
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public long[] findMonitorDeadlockedThreads() {
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Util.checkMonitorAccess();
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Thread[] threads = findMonitorDeadlockedThreads0();
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if (threads == null) {
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return null;
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}
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long[] ids = new long[threads.length];
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for (int i = 0; i < threads.length; i++) {
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Thread t = threads[i];
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ids[i] = t.getId();
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}
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return ids;
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}
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@Override
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public long[] findDeadlockedThreads() {
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if (!isSynchronizerUsageSupported()) {
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throw new UnsupportedOperationException(
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"Monitoring of Synchronizer Usage is not supported.");
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}
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Util.checkMonitorAccess();
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Thread[] threads = findDeadlockedThreads0();
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if (threads == null) {
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return null;
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}
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long[] ids = new long[threads.length];
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for (int i = 0; i < threads.length; i++) {
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Thread t = threads[i];
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ids[i] = t.getId();
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}
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return ids;
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}
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@Override
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public void resetPeakThreadCount() {
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Util.checkControlAccess();
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resetPeakThreadCount0();
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}
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@Override
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public boolean isObjectMonitorUsageSupported() {
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return jvm.isObjectMonitorUsageSupported();
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}
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@Override
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public boolean isSynchronizerUsageSupported() {
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return jvm.isSynchronizerUsageSupported();
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}
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private void verifyDumpThreads(boolean lockedMonitors,
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boolean lockedSynchronizers) {
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if (lockedMonitors && !isObjectMonitorUsageSupported()) {
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throw new UnsupportedOperationException(
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"Monitoring of Object Monitor Usage is not supported.");
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}
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if (lockedSynchronizers && !isSynchronizerUsageSupported()) {
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throw new UnsupportedOperationException(
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"Monitoring of Synchronizer Usage is not supported.");
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}
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Util.checkMonitorAccess();
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}
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@Override
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public ThreadInfo[] getThreadInfo(long[] ids,
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boolean lockedMonitors,
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boolean lockedSynchronizers) {
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return dumpThreads0(ids, lockedMonitors, lockedSynchronizers,
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Integer.MAX_VALUE);
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}
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public ThreadInfo[] getThreadInfo(long[] ids,
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boolean lockedMonitors,
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boolean lockedSynchronizers,
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int maxDepth) {
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if (maxDepth < 0) {
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throw new IllegalArgumentException(
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"Invalid maxDepth parameter: " + maxDepth);
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}
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verifyThreadIds(ids);
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// ids has been verified to be non-null
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// an empty array of ids should return an empty array of ThreadInfos
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if (ids.length == 0) return new ThreadInfo[0];
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verifyDumpThreads(lockedMonitors, lockedSynchronizers);
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return dumpThreads0(ids, lockedMonitors, lockedSynchronizers, maxDepth);
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}
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@Override
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public ThreadInfo[] dumpAllThreads(boolean lockedMonitors,
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boolean lockedSynchronizers) {
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return dumpAllThreads(lockedMonitors, lockedSynchronizers,
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Integer.MAX_VALUE);
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}
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public ThreadInfo[] dumpAllThreads(boolean lockedMonitors,
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boolean lockedSynchronizers,
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int maxDepth) {
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if (maxDepth < 0) {
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throw new IllegalArgumentException(
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"Invalid maxDepth parameter: " + maxDepth);
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}
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verifyDumpThreads(lockedMonitors, lockedSynchronizers);
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return dumpThreads0(null, lockedMonitors, lockedSynchronizers, maxDepth);
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}
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// VM support where maxDepth == -1 to request entire stack dump
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private static native Thread[] getThreads();
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private static native void getThreadInfo1(long[] ids,
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int maxDepth,
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ThreadInfo[] result);
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private static native long getThreadTotalCpuTime0(long id);
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private static native void getThreadTotalCpuTime1(long[] ids, long[] result);
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private static native long getThreadUserCpuTime0(long id);
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private static native void getThreadUserCpuTime1(long[] ids, long[] result);
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private static native void getThreadAllocatedMemory1(long[] ids, long[] result);
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private static native void setThreadCpuTimeEnabled0(boolean enable);
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private static native void setThreadAllocatedMemoryEnabled0(boolean enable);
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private static native void setThreadContentionMonitoringEnabled0(boolean enable);
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private static native Thread[] findMonitorDeadlockedThreads0();
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private static native Thread[] findDeadlockedThreads0();
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private static native void resetPeakThreadCount0();
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private static native ThreadInfo[] dumpThreads0(long[] ids,
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boolean lockedMonitors,
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boolean lockedSynchronizers,
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int maxDepth);
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// tid == 0 to reset contention times for all threads
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private static native void resetContentionTimes0(long tid);
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@Override
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public ObjectName getObjectName() {
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return Util.newObjectName(ManagementFactory.THREAD_MXBEAN_NAME);
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}
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}
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