| /* |
| * Copyright (C) 2009 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef PlatformMessagePortChannel_h |
| #define PlatformMessagePortChannel_h |
| |
| #include "MessagePortChannel.h" |
| |
| #include <wtf/MessageQueue.h> |
| #include <wtf/PassRefPtr.h> |
| #include <wtf/Threading.h> |
| |
| namespace WebCore { |
| |
| class MessagePort; |
| |
| // PlatformMessagePortChannel is a platform-dependent interface to the remote side of a message channel. |
| // This default implementation supports multiple threads running within a single process. Implementations for multi-process platforms should define these public APIs in their own platform-specific PlatformMessagePortChannel file. |
| // The goal of this implementation is to eliminate contention except when cloning or closing the port, so each side of the channel has its own separate mutex. |
| class PlatformMessagePortChannel : public ThreadSafeRefCounted<PlatformMessagePortChannel> { |
| public: |
| static void createChannel(PassRefPtr<MessagePort>, PassRefPtr<MessagePort>); |
| |
| // APIs delegated from MessagePortChannel.h |
| bool entangleIfOpen(MessagePort*); |
| void disentangle(); |
| void postMessageToRemote(PassOwnPtr<MessagePortChannel::EventData>); |
| bool tryGetMessageFromRemote(OwnPtr<MessagePortChannel::EventData>&); |
| void close(); |
| bool isConnectedTo(MessagePort*); |
| bool hasPendingActivity(); |
| MessagePort* locallyEntangledPort(const ScriptExecutionContext*); |
| |
| // Wrapper for MessageQueue that allows us to do thread safe sharing by two proxies. |
| class MessagePortQueue : public ThreadSafeRefCounted<MessagePortQueue> { |
| public: |
| static PassRefPtr<MessagePortQueue> create() { return adoptRef(new MessagePortQueue()); } |
| |
| PassOwnPtr<MessagePortChannel::EventData> tryGetMessage() |
| { |
| return m_queue.tryGetMessage(); |
| } |
| |
| bool appendAndCheckEmpty(PassOwnPtr<MessagePortChannel::EventData> message) |
| { |
| return m_queue.appendAndCheckEmpty(message); |
| } |
| |
| bool isEmpty() |
| { |
| return m_queue.isEmpty(); |
| } |
| |
| private: |
| MessagePortQueue() { } |
| |
| MessageQueue<MessagePortChannel::EventData> m_queue; |
| }; |
| |
| ~PlatformMessagePortChannel(); |
| |
| private: |
| static PassRefPtr<PlatformMessagePortChannel> create(PassRefPtr<MessagePortQueue> incoming, PassRefPtr<MessagePortQueue> outgoing); |
| PlatformMessagePortChannel(PassRefPtr<MessagePortQueue> incoming, PassRefPtr<MessagePortQueue> outgoing); |
| |
| PassRefPtr<PlatformMessagePortChannel> entangledChannel(); |
| void setEntangledChannel(PassRefPtr<PlatformMessagePortChannel>); |
| |
| void setRemotePort(MessagePort*); |
| MessagePort* remotePort(); |
| void closeInternal(); |
| |
| // Mutex used to ensure exclusive access to the object internals. |
| Mutex m_mutex; |
| |
| // Pointer to our entangled pair - cleared when close() is called. |
| RefPtr<PlatformMessagePortChannel> m_entangledChannel; |
| |
| // Reference to the message queue for the (local) entangled port. |
| RefPtr<MessagePortQueue> m_incomingQueue; |
| RefPtr<MessagePortQueue> m_outgoingQueue; |
| |
| // The port we are connected to (the remote port) - this is the port that is notified when new messages arrive. |
| MessagePort* m_remotePort; |
| }; |
| |
| } // namespace WebCore |
| |
| #endif // PlatformMessagePortChannel_h |