--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/management/ThreadImpl.java Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,413 @@
+/*
+ * Copyright 2003-2005 Sun Microsystems, Inc. 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. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+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);
+}