--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/vmTestbase/nsk/monitoring/share/thread/BlockedThread.java	Wed May 02 16:43:56 2018 -0700
@@ -0,0 +1,117 @@
+/*
+ * Copyright (c) 2007, 2018, 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.
+ */
+package nsk.monitoring.share.thread;
+
+import nsk.share.log.Log;
+import java.lang.management.ThreadInfo;
+import java.lang.management.MonitorInfo;
+import java.lang.management.LockInfo;
+import nsk.share.TestBug;
+import nsk.share.test.LocalRandom;
+import nsk.monitoring.share.Monitoring;
+
+/**
+ * BlockedThread is RecursiveMonitoringThread that blocks on entering
+ * synchronized section.
+ */
+public class BlockedThread extends RecursiveMonitoringThread {
+        private LockerThread lockerThread;
+        protected Object lock;
+        protected Object readyLock = new Object();
+        protected volatile boolean ready = false;
+        private static final String[] expectedMethods = {
+                "nsk.monitoring.share.thread.BlockedThread.runInside"
+        };
+
+        public BlockedThread(Log log, RunType recursionType, int maxDepth, LockerThread lockerThread) {
+                super(log, recursionType, maxDepth);
+                this.lockerThread = lockerThread;
+                this.lock = lockerThread.getLock();
+        }
+
+        public void checkThreadInfo(ThreadInfo info) {
+                super.checkThreadInfo(info);
+                verify(info.getThreadState() == Thread.State.BLOCKED, "ThreadInfo.getThreadState() = " + info.getThreadState() + " != " + Thread.State.BLOCKED);
+                verify(info.getBlockedTime() == 0 || info.getBlockedTime() == -1, "ThreadInfo.getBlockedTime() == " + info.getBlockedTime());
+                verify(info.getBlockedCount() >= 1, "ThreadInfo.getBlockedCount() = " + info.getBlockedCount() + " != " + 1);
+                verify(info.getWaitedTime() == 0 || info.getWaitedTime() == -1, "ThreadInfo.getWaitedTime() == " + info.getWaitedTime());
+                verify(info.getWaitedCount() == 0, "ThreadInfo.getWaitedCount() = " + info.getWaitedCount() + " != " + 0);
+                checkLockInfo(info.getLockInfo(), lock);
+                verify(info.getLockName().equals(info.getLockInfo().toString()), "ThreadInfo.getLockName() = " + info.getLockName() + " != lock.toString() = " + lock.toString());
+                verify(info.getLockOwnerId() == lockerThread.getId(), "ThreadInfo.getLockOwnerId() = " + info.getLockOwnerId() + " != this.getId() = " + this.getId());
+                verify(info.getLockOwnerName().equals(lockerThread.getName()), "ThreadInfo.getLockOwnerName() = " + info.getLockOwnerName() + " != lockerThread.getName() = " + lockerThread.getName());
+                checkMonitorInfo(info.getLockedMonitors(), null);
+                checkSynchronizers(info.getLockedSynchronizers(), null);
+        }
+
+        private void checkStackTrace(MonitorInfo[] minfo, StackTraceElement[] elements) {
+                verify(minfo.length == 1, "ThreadInfo.getLockedMonitors() is of length " + minfo.length);
+                MonitorInfo minfo1 = minfo[0];
+                verify(minfo1.getLockedStackDepth() == elements.length, "MonitorInfo.getLockedStackDepth() = " + minfo1.getLockedStackDepth() + " != elements.length = " + elements.length);
+                verify(minfo1.getLockedStackFrame().equals(elements[elements.length - 1]), "MonitorInfo.getLockedStackFrame() = " + minfo1.getLockedStackFrame() + " is different from last element " + elements[elements.length - 1]);
+                checkLockInfo(minfo1, lock);
+        }
+
+        public void waitState() {
+                synchronized (readyLock) {
+                        while (!ready) {
+                                try {
+                                        readyLock.wait();
+                                } catch (InterruptedException e) {
+                                        log.warn(e);
+                                }
+                        }
+                }
+                waitThreadState(Thread.State.BLOCKED);
+        }
+
+        public void finish() {
+                ready = false;
+                synchronized (lock) {
+                        lock.notify();
+                }
+        }
+
+        protected void runInside() {
+                synchronized (readyLock) {
+                        ready = true;
+                        readyLock.notifyAll();
+                }
+                do {
+                        synchronized (lock) {
+                                System.out.println("BlockedThread acquired lock");
+
+                                // Actually, this thread will reach here after LockerThread.finish() is called,
+                                // but before finish() is called. But it does not matter, because check(ThreadInfo)
+                                // was already called.
+                        }
+
+                        System.out.println("BlockedThread relinquished lock");
+
+                } while (ready);
+        }
+
+        protected boolean isStackTraceElementExpected(StackTraceElement element) {
+                return super.isStackTraceElementExpected(element) || checkStackTraceElement(element, expectedMethods);
+        }
+}