0N/A/*
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0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
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0N/A */
0N/A
0N/A/*
0N/A * @test
0N/A * @bug 4858522
0N/A * @summary Basic unit test of HotspotRuntimeMBean.getSafepointSyncTime()
0N/A * @author Steve Bohne
0N/A */
0N/A
0N/A/*
0N/A * This test is just a sanity check and does not check for the correct value.
0N/A */
0N/A
0N/Aimport sun.management.*;
0N/A
0N/Apublic class GetSafepointSyncTime {
0N/A
0N/A private static HotspotRuntimeMBean mbean =
180N/A (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
0N/A
0N/A private static final long NUM_THREAD_DUMPS = 300;
0N/A
0N/A // Careful with these values.
0N/A private static final long MIN_VALUE_FOR_PASS = 1;
0N/A private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
0N/A
0N/A private static boolean trace = false;
0N/A
0N/A public static void main(String args[]) throws Exception {
0N/A if (args.length > 0 && args[0].equals("trace")) {
0N/A trace = true;
0N/A }
0N/A
0N/A // Thread.getAllStackTraces() should cause safepoints.
0N/A // If this test is failing because it doesn't,
0N/A // MIN_VALUE_FOR_PASS should be reset to 0
0N/A for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
0N/A Thread.getAllStackTraces();
0N/A }
0N/A
0N/A long value = mbean.getSafepointSyncTime();
0N/A
0N/A if (trace) {
0N/A System.out.println("Safepoint sync time (ms): " + value);
0N/A }
0N/A
0N/A if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
0N/A throw new RuntimeException("Safepoint sync time " +
0N/A "illegal value: " + value + " ms " +
0N/A "(MIN = " + MIN_VALUE_FOR_PASS + "; " +
0N/A "MAX = " + MAX_VALUE_FOR_PASS + ")");
0N/A }
0N/A
0N/A for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
0N/A Thread.getAllStackTraces();
0N/A }
0N/A
0N/A long value2 = mbean.getSafepointSyncTime();
0N/A
0N/A if (trace) {
0N/A System.out.println("Safepoint sync time2 (ms): " + value2);
0N/A }
0N/A
0N/A if (value2 <= value) {
0N/A throw new RuntimeException("Safepoint sync time " +
0N/A "did not increase " +
0N/A "(value = " + value + "; " +
0N/A "value2 = " + value2 + ")");
0N/A }
0N/A
0N/A System.out.println("Test passed.");
0N/A }
0N/A}