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undefect. CWE-407 — 63 sites patched across 27 ecosystems

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Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com

Patches, unit tests, benchmarks, whitepaper, and outreach briefs.
Public domain — no copyright claimed. Use freely.
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russell@unturf.com 2026-03-26 17:11:57 -04:00
commit 0a580b313d
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238
test/jdk/java/lang/management/ThreadMXBean/ThreadUserTime.java Normal file
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/*
* Copyright (c) 2004, 2025, 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
* @bug 4997799
* @summary Basic test of ThreadMXBean.getThreadUserTime and
* getCurrentThreadUserTime.
* @author Mandy Chung
* @requires test.thread.factory != "Virtual"
*/
import java.lang.management.*;
public class ThreadUserTime {
private static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
private static boolean testFailed = false;
private static boolean done = false;
private static Object obj = new Object();
private static final int NUM_THREADS = 10;
private static Thread[] threads = new Thread[NUM_THREADS];
private static long[] times = new long[NUM_THREADS];
// careful about this value
private static final int DELTA = 100;
public static void main(String[] argv)
throws Exception {
if (!mbean.isCurrentThreadCpuTimeSupported()) {
return;
}
// disable user time
if (mbean.isThreadCpuTimeEnabled()) {
mbean.setThreadCpuTimeEnabled(false);
}
Thread curThread = Thread.currentThread();
long t = mbean.getCurrentThreadUserTime();
if (t != -1) {
throw new RuntimeException("Invalid CurrenThreadUserTime returned = " +
t + " expected = -1");
}
if (mbean.isThreadCpuTimeSupported()) {
long t1 = mbean.getThreadUserTime(curThread.getId());
if (t1 != -1) {
throw new RuntimeException("Invalid ThreadUserTime returned = " +
t1 + " expected = -1");
}
}
// Enable CPU Time measurement
if (!mbean.isThreadCpuTimeEnabled()) {
mbean.setThreadCpuTimeEnabled(true);
}
if (!mbean.isThreadCpuTimeEnabled()) {
throw new RuntimeException("ThreadUserTime is expected to be enabled");
}
long time = mbean.getCurrentThreadUserTime();
if (time < 0) {
throw new RuntimeException("Invalid user time returned = " + time);
}
if (!mbean.isThreadCpuTimeSupported()) {
return;
}
// Expected to be time1 >= time
long time1 = mbean.getThreadUserTime(curThread.getId());
if (time1 < time) {
throw new RuntimeException("User time " + time1 +
" expected >= " + time);
}
System.out.println(curThread.getName() +
" Current Thread User Time = " + time +
" user time = " + time1);
for (int i = 0; i < NUM_THREADS; i++) {
threads[i] = new MyThread("MyThread-" + i);
threads[i].start();
}
waitUntilThreadBlocked();
for (int i = 0; i < NUM_THREADS; i++) {
times[i] = mbean.getThreadUserTime(threads[i].getId());
}
goSleep(200);
for (int i = 0; i < NUM_THREADS; i++) {
long newTime = mbean.getThreadUserTime(threads[i].getId());
if (times[i] > newTime) {
throw new RuntimeException("TEST FAILED: " +
threads[i].getName() +
" previous user user time = " + times[i] +
" > current user user time = " + newTime);
}
if ((times[i] + DELTA) < newTime) {
throw new RuntimeException("TEST FAILED: " +
threads[i].getName() +
" user time = " + newTime +
" previous user time " + times[i] +
" out of expected range");
}
System.out.println(threads[i].getName() +
" Previous User Time = " + times[i] +
" Current User time = " + newTime);
}
synchronized (obj) {
done = true;
obj.notifyAll();
}
for (int i = 0; i < NUM_THREADS; i++) {
try {
threads[i].join();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
testFailed = true;
break;
}
}
if (testFailed) {
throw new RuntimeException("TEST FAILED");
}
System.out.println("Test passed");
}
private static void goSleep(long ms) throws Exception {
try {
Thread.sleep(ms);
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
throw e;
}
}
private static void waitUntilThreadBlocked()
throws Exception {
int count = 0;
while (count != NUM_THREADS) {
goSleep(100);
count = 0;
for (int i = 0; i < NUM_THREADS; i++) {
ThreadInfo info = mbean.getThreadInfo(threads[i].getId());
if (info.getThreadState() == Thread.State.WAITING) {
count++;
}
}
}
}
static class MyThread extends Thread {
public MyThread(String name) {
super(name);
}
public void run() {
double sum = 0;
for (int i = 0; i < 5000; i++) {
double r = Math.random();
double x = Math.pow(3, r);
sum += x - r;
}
synchronized (obj) {
while (!done) {
try {
obj.wait();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
testFailed = true;
break;
}
}
}
sum = 0;
for (int i = 0; i < 5000; i++) {
double r = Math.random();
double x = Math.pow(3, r);
sum += x - r;
}
long time1 = mbean.getCurrentThreadCpuTime();
long utime1 = mbean.getCurrentThreadUserTime();
long time2 = mbean.getThreadCpuTime(getId());
long utime2 = mbean.getThreadUserTime(getId());
System.out.println(getName() + ":");
System.out.println("CurrentThreadUserTime = " + utime1 +
" ThreadUserTime = " + utime2);
System.out.println("CurrentThreadCpuTime = " + time1 +
" ThreadCpuTime = " + time2);
if (time1 > time2) {
throw new RuntimeException("TEST FAILED: " + getName() +
" CurrentThreadCpuTime = " + time1 +
" > ThreadCpuTime = " + time2);
}
if (utime1 > utime2) {
throw new RuntimeException("TEST FAILED: " + getName() +
" CurrentThreadUserTime = " + utime1 +
" > ThreadUserTime = " + utime2);
}
}
}
}