cef/libcef/cef_process.h

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// Copyright (c) 2010 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2010 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.
// This interface is for managing the global services of the application. Each
// service is lazily created when requested the first time. The service getters
// will return NULL if the service is not available, so callers must check for
// this condition.
#ifndef _CEF_PROCESS_H
#define _CEF_PROCESS_H
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "base/message_loop.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "ipc/ipc_message.h"
namespace base {
class Thread;
class WaitableEvent;
}
class CefProcessIOThread;
class CefProcessUIThread;
class CefMessageLoopForUI;
// NOT THREAD SAFE, call only from the main thread.
// These functions shouldn't return NULL unless otherwise noted.
class CefProcess : public base::RefCounted<CefProcess>,
public base::NonThreadSafe {
public:
CefProcess(bool multi_threaded_message_loop);
virtual ~CefProcess();
// Creates key child threads. We need to do this explicitly since
// CefThread::PostTask silently deletes a posted task if the target message
// loop isn't created.
void CreateChildThreads() {
ui_thread();
// Create the FILE thread before the IO thread because IO thread
// initialization depends on existance of the FILE thread (for cache
// support, etc).
file_thread();
io_thread();
}
CefProcessUIThread* ui_thread() {
DCHECK(CalledOnValidThread());
if (!created_ui_thread_)
CreateUIThread();
return ui_thread_.get();
}
// Necessary to perform work on the UI thread if started without a multi
// threaded message loop.
void DoMessageLoopIteration();
// Returns the thread that we perform I/O coordination on (network requests,
// communication with renderers, etc.
// NOTE: You should ONLY use this to pass to IPC or other objects which must
// need a MessageLoop*. If you just want to post a task, use
// CefThread::PostTask (or other variants) as they take care of checking
// that a thread is still alive, race conditions, lifetime differences etc.
// If you still must use this, need to check the return value for NULL.
CefProcessIOThread* io_thread() {
DCHECK(CalledOnValidThread());
if (!created_io_thread_)
CreateIOThread();
return io_thread_.get();
}
// Returns the thread that we perform random file operations on. For code
// that wants to do I/O operations (not network requests or even file: URL
// requests), this is the thread to use to avoid blocking the UI thread.
// It might be nicer to have a thread pool for this kind of thing.
base::Thread* file_thread() {
DCHECK(CalledOnValidThread());
if (!created_file_thread_)
CreateFileThread();
return file_thread_.get();
}
#if defined(IPC_MESSAGE_LOG_ENABLED)
// Enable or disable IPC logging for the browser, all processes
// derived from ChildProcess (plugin etc), and all
// renderers.
void SetIPCLoggingEnabled(bool enable);
#endif
private:
void CreateUIThread();
void CreateIOThread();
void CreateFileThread();
bool multi_threaded_message_loop_;
bool created_ui_thread_;
scoped_ptr<CefProcessUIThread> ui_thread_;
scoped_ptr<CefMessageLoopForUI> ui_message_loop_;
bool created_io_thread_;
scoped_ptr<CefProcessIOThread> io_thread_;
bool created_file_thread_;
scoped_ptr<base::Thread> file_thread_;
DISALLOW_COPY_AND_ASSIGN(CefProcess);
};
extern CefProcess* g_cef_process;
#endif // _CEF_PROCESS_H