412 lines
14 KiB
Java
412 lines
14 KiB
Java
/*
|
|
* Copyright (c) 2003, 2014, 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.
|
|
*/
|
|
|
|
/*
|
|
* @test
|
|
* @bug 4530538
|
|
* @summary Basic unit test of ThreadInfo.getLockName()
|
|
* and ThreadInfo.getLockOwnerName()
|
|
* @author Mandy Chung
|
|
* @author Jaroslav Bachorik
|
|
*
|
|
* @library /lib/testlibrary
|
|
* @build jdk.testlibrary.*
|
|
* @run main/othervm Locks
|
|
*/
|
|
|
|
import java.lang.management.*;
|
|
import java.util.concurrent.Phaser;
|
|
import jdk.testlibrary.LockFreeLogManager;
|
|
|
|
public class Locks {
|
|
private static final Object objA = new Object();
|
|
private static final Object objB = new Object();
|
|
private static final Object objC = new Object();
|
|
private static final ThreadMXBean tm = ManagementFactory.getThreadMXBean();
|
|
private static final LockFreeLogManager logger = new LockFreeLogManager();
|
|
|
|
private static boolean testFailed = false;
|
|
|
|
private static String getLockName(Object lock) {
|
|
if (lock == null) return null;
|
|
|
|
return lock.getClass().getName() + '@' +
|
|
Integer.toHexString(System.identityHashCode(lock));
|
|
}
|
|
|
|
private static void assertNoLock(Thread t) {
|
|
long tid = t.getId();
|
|
ThreadInfo info = tm.getThreadInfo(tid);
|
|
String result = info.getLockName();
|
|
|
|
if (result != null) {
|
|
throw new RuntimeException("Thread " + t.getName() + " is not supposed to hold any lock. " +
|
|
"Currently owning lock: " + result);
|
|
}
|
|
}
|
|
|
|
private static void checkBlockedObject(Thread t, Object lock, Thread owner,
|
|
Thread.State expectedState) {
|
|
long tid = t.getId();
|
|
ThreadInfo info = tm.getThreadInfo(tid);
|
|
String result = info.getLockName();
|
|
String expectedLock = (lock != null ? getLockName(lock) : null);
|
|
String expectedOwner = (owner != null ? owner.getName() : null);
|
|
|
|
if (lock != null) {
|
|
if (expectedState == Thread.State.BLOCKED) {
|
|
int retryCount=0;
|
|
while(info.getThreadState() != Thread.State.BLOCKED) {
|
|
if (retryCount++ > 500) {
|
|
throw new RuntimeException("Thread " + t.getName() +
|
|
" is expected to block on " + expectedLock +
|
|
" but got " + result +
|
|
" Thread.State = " + info.getThreadState());
|
|
}
|
|
goSleep(100);
|
|
info = tm.getThreadInfo(tid);
|
|
result = info.getLockName();
|
|
}
|
|
}
|
|
if (expectedState == Thread.State.WAITING &&
|
|
info.getThreadState() != Thread.State.WAITING) {
|
|
throw new RuntimeException("Thread " + t.getName() +
|
|
" is expected to wait on " + expectedLock +
|
|
" but got " + result +
|
|
" Thread.State = " + info.getThreadState());
|
|
}
|
|
}
|
|
|
|
if ((result != null && !result.equals(expectedLock)) ||
|
|
(result == null && expectedLock != null)) {
|
|
throw new RuntimeException("Thread " + t.getName() + " is blocked on " +
|
|
expectedLock + " but got " + result);
|
|
}
|
|
result = info.getLockOwnerName();
|
|
if ((result != null && !result.equals(expectedOwner)) ||
|
|
(result == null && expectedOwner != null)) {
|
|
throw new RuntimeException("Owner of " + lock + " should be " +
|
|
expectedOwner + " but got " + result);
|
|
}
|
|
}
|
|
|
|
private static void goSleep(long ms) {
|
|
try {
|
|
Thread.sleep(ms);
|
|
} catch (InterruptedException e) {
|
|
e.printStackTrace();
|
|
testFailed = true;
|
|
}
|
|
}
|
|
|
|
private static volatile int dummyCounter = 0;
|
|
|
|
static class LockAThread extends Thread {
|
|
private final Phaser p;
|
|
public LockAThread(Phaser p) {
|
|
super("LockAThread");
|
|
this.p = p;
|
|
}
|
|
public void run() {
|
|
synchronized(objA) {
|
|
// stop here for LockBThread to hold objB
|
|
log("LockAThread about to block on objB");
|
|
p.arriveAndAwaitAdvance(); // Phase 1 (blocking)
|
|
synchronized(objB) {
|
|
dummyCounter++;
|
|
};
|
|
}
|
|
p.arriveAndAwaitAdvance(); // Phase 2 (blocking)
|
|
log("LockAThread about to exit");
|
|
// Make sure the current thread is not holding any lock
|
|
assertNoLock(this);
|
|
}
|
|
}
|
|
|
|
static class LockBThread extends Thread {
|
|
private final Phaser p;
|
|
public LockBThread(Phaser p) {
|
|
super("LockBThread");
|
|
this.p = p;
|
|
}
|
|
public void run() {
|
|
synchronized(objB) {
|
|
log("LockBThread about to block on objC");
|
|
p.arriveAndAwaitAdvance(); // Phase 1 (blocking)
|
|
// Signal main thread about to block on objC
|
|
synchronized(objC) {
|
|
dummyCounter++;
|
|
};
|
|
}
|
|
p.arriveAndAwaitAdvance(); // Phase 2 (blocking)
|
|
log("LockBThread about to exit");
|
|
// Make sure the current thread is not holding any lock
|
|
assertNoLock(this);
|
|
}
|
|
}
|
|
|
|
private static WaitingThread waiter;
|
|
private static final Object ready = new Object();
|
|
private static CheckerThread checker;
|
|
static class WaitingThread extends Thread {
|
|
private final Phaser p;
|
|
|
|
volatile boolean waiting = false;
|
|
|
|
public WaitingThread(Phaser p) {
|
|
super("WaitingThread");
|
|
this.p = p;
|
|
}
|
|
@Override
|
|
public void run() {
|
|
synchronized(objC) {
|
|
log("WaitingThread about to wait on objC");
|
|
try {
|
|
// Signal checker thread, about to wait on objC.
|
|
waiting = false;
|
|
p.arriveAndAwaitAdvance(); // Phase 1 (waiting)
|
|
waiting = true;
|
|
objC.wait();
|
|
} catch (InterruptedException e) {
|
|
e.printStackTrace();
|
|
testFailed = true;
|
|
}
|
|
|
|
// block until CheckerThread finishes checking
|
|
log("WaitingThread about to block on ready");
|
|
// signal checker thread that it is about acquire
|
|
// object ready.
|
|
p.arriveAndAwaitAdvance(); // Phase 2 (waiting)
|
|
synchronized(ready) {
|
|
dummyCounter++;
|
|
}
|
|
}
|
|
synchronized(objC) {
|
|
try {
|
|
// signal checker thread, about to wait on objC
|
|
waiting = false;
|
|
p.arriveAndAwaitAdvance(); // Phase 3 (waiting)
|
|
waiting = true;
|
|
objC.wait();
|
|
} catch (InterruptedException e) {
|
|
e.printStackTrace();
|
|
testFailed = true;
|
|
}
|
|
}
|
|
log("WaitingThread about to exit waiting on objC 2");
|
|
}
|
|
|
|
public void waitForWaiting() {
|
|
p.arriveAndAwaitAdvance();
|
|
while (!waiting) {
|
|
goSleep(10);
|
|
}
|
|
waitForState(State.WAITING);
|
|
}
|
|
|
|
public void waitForBlocked() {
|
|
p.arriveAndAwaitAdvance();
|
|
waitForState(State.BLOCKED);
|
|
}
|
|
|
|
private void waitForState(Thread.State state) {
|
|
while (!waiter.isInterrupted() && waiter.getState() != state) {
|
|
Thread.yield();
|
|
}
|
|
}
|
|
}
|
|
static class CheckerThread extends Thread {
|
|
public CheckerThread() {
|
|
super("CheckerThread");
|
|
}
|
|
|
|
public void run() {
|
|
synchronized (ready) {
|
|
// wait until WaitingThread about to wait for objC
|
|
waiter.waitForWaiting(); // Phase 1 (waiting)
|
|
checkBlockedObject(waiter, objC, null, Thread.State.WAITING);
|
|
|
|
synchronized (objC) {
|
|
objC.notify();
|
|
}
|
|
|
|
// wait for waiter thread to about to enter
|
|
// synchronized object ready.
|
|
waiter.waitForBlocked(); // Phase 2 (waiting)
|
|
checkBlockedObject(waiter, ready, this, Thread.State.BLOCKED);
|
|
}
|
|
|
|
// wait for signal from waiting thread that it is about
|
|
// wait for objC.
|
|
waiter.waitForWaiting(); // Phase 3 (waiting)
|
|
synchronized(objC) {
|
|
checkBlockedObject(waiter, objC, Thread.currentThread(), Thread.State.WAITING);
|
|
objC.notify();
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
public static void main(String args[]) throws Exception {
|
|
Thread mainThread = Thread.currentThread();
|
|
|
|
// Test uncontested case
|
|
LockAThread t1;
|
|
LockBThread t2;
|
|
|
|
Phaser p = new Phaser(3);
|
|
synchronized(objC) {
|
|
// Make sure the main thread is not holding any lock
|
|
assertNoLock(mainThread);
|
|
|
|
// Test deadlock case
|
|
// t1 holds lockA and attempts to lock B
|
|
// t2 holds lockB and attempts to lock C
|
|
|
|
t1 = new LockAThread(p);
|
|
t1.start();
|
|
|
|
t2 = new LockBThread(p);
|
|
t2.start();
|
|
|
|
p.arriveAndAwaitAdvance(); // Phase 1 (blocking)
|
|
checkBlockedObject(t2, objC, mainThread, Thread.State.BLOCKED);
|
|
checkBlockedObject(t1, objB, t2, Thread.State.BLOCKED);
|
|
|
|
long[] expectedThreads = new long[3];
|
|
expectedThreads[0] = t1.getId(); // blocked on lockB
|
|
expectedThreads[1] = t2.getId(); // owner of lockB blocking on lockC
|
|
expectedThreads[2] = mainThread.getId(); // owner of lockC
|
|
findThreadsBlockedOn(objB, expectedThreads);
|
|
}
|
|
p.arriveAndAwaitAdvance(); // Phase 2 (blocking)
|
|
|
|
p = new Phaser(2);
|
|
// Test Object.wait() case
|
|
waiter = new WaitingThread(p);
|
|
waiter.start();
|
|
|
|
checker = new CheckerThread();
|
|
checker.start();
|
|
|
|
try {
|
|
waiter.join();
|
|
checker.join();
|
|
} catch (InterruptedException e) {
|
|
e.printStackTrace();
|
|
testFailed = true;
|
|
}
|
|
|
|
if (testFailed) {
|
|
throw new RuntimeException("TEST FAILED.");
|
|
}
|
|
System.out.println("Test passed.");
|
|
}
|
|
|
|
private static ThreadInfo findOwnerInfo(ThreadInfo[] infos, String lock)
|
|
throws Exception {
|
|
ThreadInfo ownerInfo = null;
|
|
for (ThreadInfo info : infos) {
|
|
String blockedLock = info.getLockName();
|
|
if (lock.equals(blockedLock)) {
|
|
long threadId = info.getLockOwnerId();
|
|
if (threadId == -1) {
|
|
throw new RuntimeException("TEST FAILED: " +
|
|
lock + " expected to have owner");
|
|
}
|
|
for (int j = 0; j < infos.length; j++) {
|
|
if (infos[j].getThreadId() == threadId) {
|
|
ownerInfo = infos[j];
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return ownerInfo;
|
|
}
|
|
private static void findThreadsBlockedOn(Object o, long[] expectedThreads)
|
|
throws Exception {
|
|
String lock = getLockName(o);
|
|
// Check with ThreadInfo with no stack trace (i.e. no safepoint)
|
|
ThreadInfo[] infos = tm.getThreadInfo(tm.getAllThreadIds());
|
|
doCheck(infos, lock, expectedThreads);
|
|
|
|
// Check with ThreadInfo with stack trace
|
|
infos = tm.getThreadInfo(tm.getAllThreadIds(), 1);
|
|
doCheck(infos, lock, expectedThreads);
|
|
}
|
|
|
|
private static void doCheck(ThreadInfo[] infos, String lock, long[] expectedThreads)
|
|
throws Exception {
|
|
ThreadInfo ownerInfo = null;
|
|
// Find the thread who is blocking on lock
|
|
for (ThreadInfo info : infos) {
|
|
String blockedLock = info.getLockName();
|
|
if (lock.equals(blockedLock)) {
|
|
log("%s blocked on %s", info.getThreadName(), blockedLock);
|
|
ownerInfo = info;
|
|
}
|
|
}
|
|
if (ownerInfo == null) {
|
|
throw new RuntimeException("TEST FAILED: " +
|
|
"Can't retrieve ThreadInfo for the blocked thread");
|
|
}
|
|
|
|
long[] threads = new long[10];
|
|
int count = 0;
|
|
threads[count++] = ownerInfo.getThreadId();
|
|
while (ownerInfo != null && ownerInfo.getThreadState() == Thread.State.BLOCKED) {
|
|
ownerInfo = findOwnerInfo(infos, lock);
|
|
threads[count++] = ownerInfo.getThreadId();
|
|
log(" Owner = %s id = %d",
|
|
ownerInfo.getThreadName(),
|
|
ownerInfo.getThreadId()
|
|
);
|
|
lock = ownerInfo.getLockName();
|
|
log("%s Id = %d blocked on %s",
|
|
ownerInfo.getThreadName(),
|
|
ownerInfo.getThreadId(),
|
|
lock
|
|
);
|
|
}
|
|
log("");
|
|
|
|
if (count != expectedThreads.length) {
|
|
throw new RuntimeException("TEST FAILED: " +
|
|
"Expected chain of threads not matched; current count =" + count);
|
|
}
|
|
for (int i = 0; i < count; i++) {
|
|
if (threads[i] != expectedThreads[i]) {
|
|
log("TEST FAILED: Unexpected thread in the chain %s expected to be %s",
|
|
threads[i],
|
|
expectedThreads[i]
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
private static void log(String format, Object ... args) {
|
|
logger.log(format + "%n", args);
|
|
}
|
|
}
|