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7046238: new InitialContext(); hangs

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Synchronization on a single monitor for contactInfo parameters with identical hashCode()

Reviewed-by: robm, skoppar
This commit is contained in:
Dmeetry Degrave 2011-12-18 22:12:41 +04:00
parent b6bd9844c4
commit 2829f07b30
1 changed files with 23 additions and 4 deletions
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27
corba/src/share/classes/com/sun/corba/se/impl/protocol/CorbaClientRequestDispatcherImpl.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 2011, 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
@ -113,6 +113,9 @@ import com.sun.corba.se.impl.protocol.giopmsgheaders.ReferenceAddr;
import com.sun.corba.se.impl.transport.CorbaContactInfoListIteratorImpl;
import com.sun.corba.se.impl.util.JDKBridge;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.ConcurrentHashMap;
/**
* ClientDelegate is the RMI client-side subcontract or representation
* It implements RMI delegate as well as our internal ClientRequestDispatcher
@ -122,6 +125,9 @@ public class CorbaClientRequestDispatcherImpl
implements
ClientRequestDispatcher
{
private ConcurrentMap<ContactInfo, Object> locks =
new ConcurrentHashMap<ContactInfo, Object>();
public OutputObject beginRequest(Object self, String opName,
boolean isOneWay, ContactInfo contactInfo)
{
@ -148,8 +154,21 @@ public class CorbaClientRequestDispatcherImpl
// This locking is done so that multiple connections are not created
// for the same endpoint
//6929137 - Synchronized on contactInfo to avoid blocking across multiple endpoints
synchronized (contactInfo) {
// 7046238 - Synchronization on a single monitor for contactInfo parameters
// with identical hashCode(), so we lock on same monitor for equal parameters
// (which can refer to equal (in terms of equals()) but not the same objects)
Object lock = locks.get(contactInfo);
if (lock == null) {
Object newLock = new Object();
lock = locks.putIfAbsent(contactInfo, newLock);
if (lock == null) {
lock = newLock;
}
}
synchronized (lock) {
if (contactInfo.isConnectionBased()) {
if (contactInfo.shouldCacheConnection()) {
connection = (CorbaConnection)
@ -254,7 +273,7 @@ public class CorbaClientRequestDispatcherImpl
registerWaiter(messageMediator);
// Do connection reclaim now
synchronized (contactInfo) {
synchronized (lock) {
if (contactInfo.isConnectionBased()) {
if (contactInfo.shouldCacheConnection()) {
OutboundConnectionCache connectionCache =