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*
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* version 2 for more details (a copy is included in the LICENSE file that
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*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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/*
* @test
* @bug 6173675
* @summary Basic test of ThreadMXBean.getThreadCpuTime(long[]) and
* getThreadUserTime(long[]).
* @author Paul Hohensee
* @key randomness
* @modules jdk.management
*/
import java.lang.management.*;
public class ThreadCpuTimeArray {
private static com.sun.management.ThreadMXBean mbean =
(com.sun.management.ThreadMXBean)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];
// careful about this value
private static final int DELTA = 100;
public static void main(String[] argv)
throws Exception {
if (!mbean.isThreadCpuTimeSupported()) {
return;
}
// disable CPU time
if (mbean.isThreadCpuTimeEnabled()) {
mbean.setThreadCpuTimeEnabled(false);
}
if (mbean.isThreadCpuTimeEnabled()) {
throw new RuntimeException("ThreadCpuTime is expected to be disabled");
}
// start threads, wait for them to block
long[] ids = new long[NUM_THREADS];
for (int i = 0; i < NUM_THREADS; i++) {
threads[i] = new MyThread("MyThread-" + i);
threads[i].start();
ids[i] = threads[i].getId();
}
// threads block after doing some computation
waitUntilThreadBlocked();
long times[] = mbean.getThreadCpuTime(ids);
long userTimes[] = mbean.getThreadUserTime(ids);
if (times == null) {
throw new RuntimeException("Null ThreadCpuTime array returned");
}
for (int i = 0; i < NUM_THREADS; i++) {
long t = times[i];
if (t != -1) {
throw new RuntimeException(
"Invalid ThreadCpuTime returned for thread " +
threads[i].getName() + " = " + t + " expected = -1");
}
long ut = userTimes[i];
if (ut != -1) {
throw new RuntimeException(
"Invalid ThreadUserTime returned for thread " +
threads[i].getName() + " = " + ut + " expected = -1");
}
}
// Enable CPU Time measurement
if (!mbean.isThreadCpuTimeEnabled()) {
mbean.setThreadCpuTimeEnabled(true);
}
if (!mbean.isThreadCpuTimeEnabled()) {
throw new RuntimeException("ThreadCpuTime is expected to be enabled");
}
times = mbean.getThreadCpuTime(ids);
userTimes = mbean.getThreadUserTime(ids);
goSleep(200);
for (int i = 0; i < NUM_THREADS; i++) {
long t = times[i];
if (t < 0) {
throw new RuntimeException(
"Invalid CPU time returned for thread " +
threads[i].getName() + " = " + t);
}
long ut = userTimes[i];
if (ut < 0) {
throw new RuntimeException(
"Invalid user time returned for thread " +
threads[i].getName() + " = " + ut);
}
}
long[] times1 = mbean.getThreadCpuTime(ids);
long[] userTimes1 = mbean.getThreadUserTime(ids);
for (int i = 0; i < NUM_THREADS; i++) {
long newTime = times1[i];
long newUserTime = userTimes1[i];
if (times[i] > newTime) {
throw new RuntimeException("TEST FAILED: " +
threads[i].getName() +
" previous CPU time = " + times[i] +
" > current CPU time = " + newTime);
}
if ((times[i] + DELTA) < newTime) {
throw new RuntimeException("TEST FAILED: " +
threads[i].getName() +
" CPU time = " + newTime +
" previous CPU time " + times[i] +
" out of expected range");
}
System.out.println(threads[i].getName() +
" Previous Cpu Time = " + times[i] +
" Current CPU time = " + newTime);
System.out.println(threads[i].getName() +
" Previous User Time = " + userTimes[i] +
" Current User time = " + newUserTime);
}
try {
times = mbean.getThreadCpuTime(null);
} catch (NullPointerException e) {
System.out.println(
"Caught expected NullPointerException: " + e.getMessage());
}
try {
ids[0] = 0;
times = mbean.getThreadCpuTime(ids);
} catch (IllegalArgumentException e) {
System.out.println(
"Caught expected IllegalArgumentException: " + e.getMessage());
}
// let threads exit
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++;
}
}
}
}
public static void doit() {
double sum = 0;
for (int i = 0; i < 5000; i++) {
double r = Math.random();
double x = Math.pow(3, r);
sum += x - r;
}
System.out.println(Thread.currentThread().getName() +
" sum = " + sum);
}
static class MyThread extends Thread {
public MyThread(String name) {
super(name);
}
public void run() {
ThreadCpuTimeArray.doit();
synchronized (obj) {
while (!done) {
try {
obj.wait();
} catch (InterruptedException e) {
System.out.println("Unexpected exception is thrown.");
e.printStackTrace(System.out);
testFailed = true;
break;
}
}
}
ThreadCpuTimeArray.doit();
}
}
}