/*
* Copyright (c) 2003, 2005, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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
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*/
package sun.management;
import java.lang.management.ThreadMXBean;
import java.lang.management.ThreadInfo;
import java.lang.management.LockInfo;
import java.lang.management.MonitorInfo;
import java.util.Map;
import java.util.HashMap;
/**
* Implementation class for the thread subsystem.
* Standard and committed hotspot-specific metrics if any.
*
* ManagementFactory.getThreadMXBean() returns an instance
* of this class.
*/
class ThreadImpl implements ThreadMXBean {
private final VMManagement jvm;
// default for thread contention monitoring is disabled.
private boolean contentionMonitoringEnabled = false;
private boolean cpuTimeEnabled;
/**
* Constructor of ThreadImpl class.
*/
ThreadImpl(VMManagement vm) {
this.jvm = vm;
this.cpuTimeEnabled = jvm.isThreadCpuTimeEnabled();
}
public int getThreadCount() {
return jvm.getLiveThreadCount();
}
public int getPeakThreadCount() {
return jvm.getPeakThreadCount();
}
public long getTotalStartedThreadCount() {
return jvm.getTotalThreadCount();
}
public int getDaemonThreadCount() {
return jvm.getDaemonThreadCount();
}
public boolean isThreadContentionMonitoringSupported() {
return jvm.isThreadContentionMonitoringSupported();
}
public synchronized boolean isThreadContentionMonitoringEnabled() {
if (!isThreadContentionMonitoringSupported()) {
throw new UnsupportedOperationException(
"Thread contention monitoring is not supported.");
}
return contentionMonitoringEnabled;
}
public boolean isThreadCpuTimeSupported() {
return jvm.isOtherThreadCpuTimeSupported();
}
public boolean isCurrentThreadCpuTimeSupported() {
return jvm.isCurrentThreadCpuTimeSupported();
}
public boolean isThreadCpuTimeEnabled() {
if (!isThreadCpuTimeSupported() &&
!isCurrentThreadCpuTimeSupported()) {
throw new UnsupportedOperationException(
"Thread CPU time measurement is not supported");
}
return cpuTimeEnabled;
}
public long[] getAllThreadIds() {
ManagementFactory.checkMonitorAccess();
Thread[] threads = getThreads();
int length = threads.length;
long[] ids = new long[length];
for (int i = 0; i < length; i++) {
Thread t = threads[i];
ids[i] = t.getId();
}
return ids;
}
public ThreadInfo getThreadInfo(long id) {
if (id <= 0) {
throw new IllegalArgumentException(
"Invalid thread ID parameter: " + id);
}
long[] ids = new long[1];
ids[0] = id;
final ThreadInfo[] infos = getThreadInfo(ids, 0);
return infos[0];
}
public ThreadInfo getThreadInfo(long id, int maxDepth) {
if (id <= 0) {
throw new IllegalArgumentException(
"Invalid thread ID parameter: " + id);
}
if (maxDepth < 0) {
throw new IllegalArgumentException(
"Invalid maxDepth parameter: " + maxDepth);
}
long[] ids = new long[1];
ids[0] = id;
final ThreadInfo[] infos = getThreadInfo(ids, maxDepth);
return infos[0];
}
public ThreadInfo[] getThreadInfo(long[] ids) {
return getThreadInfo(ids, 0);
}
public ThreadInfo[] getThreadInfo(long[] ids, int maxDepth) {
if (ids == null) {
throw new NullPointerException("Null ids parameter.");
}
if (maxDepth < 0) {
throw new IllegalArgumentException(
"Invalid maxDepth parameter: " + maxDepth);
}
ManagementFactory.checkMonitorAccess();
ThreadInfo[] infos = new ThreadInfo[ids.length];
if (maxDepth == Integer.MAX_VALUE) {
getThreadInfo0(ids, -1, infos);
} else {
getThreadInfo0(ids, maxDepth, infos);
}
return infos;
}
public void setThreadContentionMonitoringEnabled(boolean enable) {
if (!isThreadContentionMonitoringSupported()) {
throw new UnsupportedOperationException(
"Thread contention monitoring is not supported");
}
ManagementFactory.checkControlAccess();
synchronized (this) {
if (contentionMonitoringEnabled != enable) {
if (enable) {
// if reeabled, reset contention time statistics
// for all threads
resetContentionTimes0(0);
}
// update the VM of the state change
setThreadContentionMonitoringEnabled0(enable);
contentionMonitoringEnabled = enable;
}
}
}
public long getCurrentThreadCpuTime() {
// check if Thread CPU time measurement is supported.
if (!isCurrentThreadCpuTimeSupported()) {
throw new UnsupportedOperationException(
"Current thread CPU time measurement is not supported.");
}
if (!isThreadCpuTimeEnabled()) {
return -1;
}
return getThreadTotalCpuTime0(0);
}
public long getThreadCpuTime(long id) {
// check if Thread CPU time measurement is supported.
if (!isThreadCpuTimeSupported() &&
!isCurrentThreadCpuTimeSupported()) {
throw new UnsupportedOperationException(
"Thread CPU Time Measurement is not supported.");
}
if (!isThreadCpuTimeSupported()) {
// support current thread only
if (id != Thread.currentThread().getId()) {
throw new UnsupportedOperationException(
"Thread CPU Time Measurement is only supported" +
" for the current thread.");
}
}
if (id <= 0) {
throw new IllegalArgumentException(
"Invalid thread ID parameter: " + id);
}
if (!isThreadCpuTimeEnabled()) {
return -1;
}
if (id == Thread.currentThread().getId()) {
// current thread
return getThreadTotalCpuTime0(0);
} else {
return getThreadTotalCpuTime0(id);
}
}
public long getCurrentThreadUserTime() {
// check if Thread CPU time measurement is supported.
if (!isCurrentThreadCpuTimeSupported()) {
throw new UnsupportedOperationException(
"Current thread CPU time measurement is not supported.");
}
if (!isThreadCpuTimeEnabled()) {
return -1;
}
return getThreadUserCpuTime0(0);
}
public long getThreadUserTime(long id) {
// check if Thread CPU time measurement is supported.
if (!isThreadCpuTimeSupported() &&
!isCurrentThreadCpuTimeSupported()) {
throw new UnsupportedOperationException(
"Thread CPU time measurement is not supported.");
}
if (!isThreadCpuTimeSupported()) {
// support current thread only
if (id != Thread.currentThread().getId()) {
throw new UnsupportedOperationException(
"Thread CPU time measurement is only supported" +
" for the current thread.");
}
}
if (id <= 0) {
throw new IllegalArgumentException(
"Invalid thread ID parameter: " + id);
}
if (!isThreadCpuTimeEnabled()) {
return -1;
}
if (id == Thread.currentThread().getId()) {
// current thread
return getThreadUserCpuTime0(0);
} else {
return getThreadUserCpuTime0(id);
}
}
public void setThreadCpuTimeEnabled(boolean enable) {
if (!isThreadCpuTimeSupported() &&
!isCurrentThreadCpuTimeSupported()) {
throw new UnsupportedOperationException(
"Thread CPU time measurement is not supported");
}
ManagementFactory.checkControlAccess();
synchronized (this) {
if (cpuTimeEnabled != enable) {
// update VM of the state change
setThreadCpuTimeEnabled0(enable);
cpuTimeEnabled = enable;
}
}
}
public long[] findMonitorDeadlockedThreads() {
ManagementFactory.checkMonitorAccess();
Thread[] threads = findMonitorDeadlockedThreads0();
if (threads == null) {
return null;
}
long[] ids = new long[threads.length];
for (int i = 0; i < threads.length; i++) {
Thread t = threads[i];
ids[i] = t.getId();
}
return ids;
}
public long[] findDeadlockedThreads() {
if (!isSynchronizerUsageSupported()) {
throw new UnsupportedOperationException(
"Monitoring of Synchronizer Usage is not supported.");
}
ManagementFactory.checkMonitorAccess();
Thread[] threads = findDeadlockedThreads0();
if (threads == null) {
return null;
}
long[] ids = new long[threads.length];
for (int i = 0; i < threads.length; i++) {
Thread t = threads[i];
ids[i] = t.getId();
}
return ids;
}
public void resetPeakThreadCount() {
ManagementFactory.checkControlAccess();
resetPeakThreadCount0();
}
public boolean isObjectMonitorUsageSupported() {
return jvm.isObjectMonitorUsageSupported();
}
public boolean isSynchronizerUsageSupported() {
return jvm.isSynchronizerUsageSupported();
}
public ThreadInfo[] getThreadInfo(long[] ids,
boolean lockedMonitors,
boolean lockedSynchronizers) {
if (ids == null) {
throw new NullPointerException("Null ids parameter.");
}
if (lockedMonitors && !isObjectMonitorUsageSupported()) {
throw new UnsupportedOperationException(
"Monitoring of Object Monitor Usage is not supported.");
}
if (lockedSynchronizers && !isSynchronizerUsageSupported()) {
throw new UnsupportedOperationException(
"Monitoring of Synchronizer Usage is not supported.");
}
ManagementFactory.checkMonitorAccess();
return dumpThreads0(ids, lockedMonitors, lockedSynchronizers);
}
public ThreadInfo[] dumpAllThreads(boolean lockedMonitors, boolean lockedSynchronizers) {
if (lockedMonitors && !isObjectMonitorUsageSupported()) {
throw new UnsupportedOperationException(
"Monitoring of Object Monitor Usage is not supported.");
}
if (lockedSynchronizers && !isSynchronizerUsageSupported()) {
throw new UnsupportedOperationException(
"Monitoring of Synchronizer Usage is not supported.");
}
ManagementFactory.checkMonitorAccess();
return dumpThreads0(null, lockedMonitors, lockedSynchronizers);
}
// VM support where maxDepth == -1 to request entire stack dump
private static native Thread[] getThreads();
private static native void getThreadInfo0(long[] ids,
int maxDepth,
ThreadInfo[] result);
private static native long getThreadTotalCpuTime0(long id);
private static native long getThreadUserCpuTime0(long id);
private static native void setThreadCpuTimeEnabled0(boolean enable);
private static native void setThreadContentionMonitoringEnabled0(boolean enable);
private static native Thread[] findMonitorDeadlockedThreads0();
private static native Thread[] findDeadlockedThreads0();
private static native void resetPeakThreadCount0();
private static native ThreadInfo[] dumpThreads0(long[] ids,
boolean lockedMonitors,
boolean lockedSynchronizers);
// tid == 0 to reset contention times for all threads
private static native void resetContentionTimes0(long tid);
}