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0N/A
0N/A/*
0N/A * @test
0N/A * @bug 4892507
0N/A * @summary Basic Test for the following reset methods:
0N/A * - ThreadMXBean.findMonitorDeadlockedThreads()
0N/A * @author Mandy Chung
0N/A *
0N/A * @build MonitorDeadlock
0N/A * @build ThreadDump
2495N/A * @run main/othervm FindMonitorDeadlock
0N/A */
0N/A
0N/Aimport java.lang.management.*;
0N/Aimport java.util.*;
0N/A
0N/Apublic class FindMonitorDeadlock {
0N/A public static void main(String[] argv) {
0N/A // create deadlocked threads
0N/A MonitorDeadlock md = new MonitorDeadlock();
0N/A
0N/A // No deadlock
0N/A ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
0N/A long[] threads = mbean.findMonitorDeadlockedThreads();
0N/A if (threads != null) {
0N/A throw new RuntimeException("TEST FAILED: Should return null.");
0N/A }
0N/A
0N/A // Let the threads to proceed
0N/A md.goDeadlock();
0N/A
0N/A // wait until the deadlock is ready
0N/A md.waitUntilDeadlock();
0N/A
0N/A // Find Deadlock
0N/A threads = mbean.findMonitorDeadlockedThreads();
0N/A if (threads == null) {
0N/A ThreadDump.dumpStacks();
0N/A throw new RuntimeException("TEST FAILED: Deadlock not detected.");
0N/A }
0N/A
0N/A // Print Deadlock stack trace
0N/A System.out.println("Found threads that are in deadlock:-");
0N/A ThreadInfo[] infos = mbean.getThreadInfo(threads, Integer.MAX_VALUE);
0N/A for (int i = 0; i < infos.length; i++) {
0N/A ThreadDump.printThreadInfo(infos[i]);
0N/A }
0N/A
0N/A md.checkResult(threads);
0N/A System.out.println("Test passed");
0N/A }
0N/A}