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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_COMMON_CHILD_THREAD_H_
#define CHROME_COMMON_CHILD_THREAD_H_
#include "base/thread.h"
#include "ipc/ipc_sync_channel.h"
#include "chrome/common/message_router.h"
#include "chrome/common/resource_dispatcher.h"
// Child processes's background thread should derive from this class.
class ChildThread : public IPC::Channel::Listener,
public IPC::Message::Sender,
public base::Thread {
public:
// Creates the thread.
ChildThread(Thread::Options options);
virtual ~ChildThread();
// IPC::Message::Sender implementation:
virtual bool Send(IPC::Message* msg);
// See documentation on MessageRouter for AddRoute and RemoveRoute
void AddRoute(int32 routing_id, IPC::Channel::Listener* listener);
void RemoveRoute(int32 routing_id);
MessageLoop* owner_loop() { return owner_loop_; }
ResourceDispatcher* resource_dispatcher() {
return resource_dispatcher_.get();
}
protected:
friend class ChildProcess;
// Starts the thread.
bool Run();
// Overrides the channel name. Used for --single-process mode.
void SetChannelName(const std::wstring& name) { channel_name_ = name; }
// Called when the process refcount is 0.
void OnProcessFinalRelease();
protected:
// The required stack size if V8 runs on a thread.
static const size_t kV8StackSize;
virtual void OnControlMessageReceived(const IPC::Message& msg) { }
// Returns the one child thread.
static ChildThread* current();
IPC::SyncChannel* channel() { return channel_.get(); }
// Thread implementation.
virtual void Init();
virtual void CleanUp();
private:
// IPC::Channel::Listener implementation:
virtual void OnMessageReceived(const IPC::Message& msg);
virtual void OnChannelError();
// The message loop used to run tasks on the thread that started this thread.
MessageLoop* owner_loop_;
std::wstring channel_name_;
scoped_ptr<IPC::SyncChannel> channel_;
// Used only on the background render thread to implement message routing
// functionality to the consumers of the ChildThread.
MessageRouter router_;
Thread::Options options_;
// Handles resource loads for this process.
// NOTE: this object lives on the owner thread.
scoped_ptr<ResourceDispatcher> resource_dispatcher_;
// If true, checks with the browser process before shutdown. This avoids race
// conditions if the process refcount is 0 but there's an IPC message inflight
// that would addref it.
bool check_with_browser_before_shutdown_;
DISALLOW_EVIL_CONSTRUCTORS(ChildThread);
};
#endif // CHROME_COMMON_CHILD_THREAD_H_
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