blob: a96d282afbad9b132e893666a3225a87e9e46585 [file] [log] [blame]
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/*
* @test
* @bug 4858522
* @summary Basic unit test of HotspotClassLoadingMBean.getSafepointCount()
* @author Steve Bohne
*
* @run main/othervm -XX:+UsePerfData GetSafepointCount
*/
/*
* This test is just a sanity check and does not check for the correct value.
*/
import sun.management.*;
public class GetSafepointCount {
private static HotspotRuntimeMBean mbean =
(HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
private static final long NUM_THREAD_DUMPS = 5;
// Careful with these values.
private static final long MIN_VALUE_FOR_PASS = NUM_THREAD_DUMPS;
private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
private static boolean trace = false;
public static void main(String args[]) throws Exception {
if (args.length > 0 && args[0].equals("trace")) {
trace = true;
}
// Thread.getAllStackTraces() should cause safepoints.
// If this test is failing because it doesn't,
// MIN_VALUE_FOR_PASS should be reset to 0
for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
Thread.getAllStackTraces();
}
long value = mbean.getSafepointCount();
if (trace) {
System.out.println("Safepoint count: " + value);
}
if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
throw new RuntimeException("Safepoint count " +
"illegal value: " + value + " " +
"(MIN = " + MIN_VALUE_FOR_PASS + "; " +
"MAX = " + MAX_VALUE_FOR_PASS + ")");
}
for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
Thread.getAllStackTraces();
}
long value2 = mbean.getSafepointCount();
if (trace) {
System.out.println("Safepoint count2: " + value2);
}
if (value2 <= value) {
throw new RuntimeException("Safepoint count " +
"did not increase " +
"(value = " + value + "; " +
"value2 = " + value2 + ")");
}
System.out.println("Test passed.");
}
}