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// 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 name Chromium Embedded

// Framework 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 CEF_INCLUDE_CEF_BASE_H_

#define CEF_INCLUDE_CEF_BASE_H_

#pragma once

#include "include/base/cef_atomic_ref_count.h"

#include "include/base/cef_build.h"

#include "include/base/cef_macros.h"

// Bring in common C++ type definitions used by CEF consumers.

#include "include/internal/cef_ptr.h"

#include "include/internal/cef_types_wrappers.h"

#if defined(OS_WIN)

#include "include/internal/cef_win.h"

#elif defined(OS_MACOSX)

#include "include/internal/cef_mac.h"

#elif defined(OS_LINUX)

#include "include/internal/cef_linux.h"

#endif

///

// Interface defining the reference count implementation methods. All framework

// classes must extend the CefBase class.

///

class CefBase {

public:

///

// Called to increment the reference count for the object. Should be called

// for every new copy of a pointer to a given object.

///

virtual void AddRef() const =0;

///

// Called to decrement the reference count for the object. Returns true if

// the reference count is 0, in which case the object should self-delete.

///

virtual bool Release() const =0;

///

// Returns true if the reference count is 1.

///

virtual bool HasOneRef() const =0;

protected:

virtual ~CefBase() {}

};

///

// Class that implements atomic reference counting.

///

class CefRefCount {

public:

CefRefCount() : ref_count_(0) {}

///

// Increment the reference count.

///

void AddRef() const {

base::AtomicRefCountInc(&ref_count_);

}

///

// Decrement the reference count. Returns true if the reference count is 0.

///

bool Release() const {

return !base::AtomicRefCountDec(&ref_count_);

}

///

// Returns true if the reference count is 1.

///

bool HasOneRef() const {

return base::AtomicRefCountIsOne(&ref_count_);

}

private:

mutable base::AtomicRefCount ref_count_;

DISALLOW_COPY_AND_ASSIGN(CefRefCount);

};

///

// Macro that provides a reference counting implementation for classes extending

// CefBase.

///

#define IMPLEMENT_REFCOUNTING(ClassName) \

public: \

void AddRef() const OVERRIDE { \

ref_count_.AddRef(); \

} \

bool Release() const OVERRIDE { \

if (ref_count_.Release()) { \

delete static_cast<const ClassName*>(this); \

return true; \

} \

return false; \

} \

bool HasOneRef() const OVERRIDE { \

return ref_count_.HasOneRef(); \

} \

private: \

CefRefCount ref_count_;

///

// Macro that provides a locking implementation. Use the Lock() and Unlock()

// methods to protect a section of code from simultaneous access by multiple

// threads. The AutoLock class is a helper that will hold the lock while in

// scope.

// THIS MACRO IS DEPRECATED. Use an explicit base::Lock member variable and

// base::AutoLock instead. For example:

// #include "include/base/cef_lock.h"

// // Class declaration.

// class MyClass : public CefBase {

// public:

// MyClass() : value_(0) {}

// // Method that may be called on multiple threads.

// void IncrementValue();

// private:

// // Value that may be accessed on multiple theads.

// int value_;

// // Lock used to protect access to |value_|.

// base::Lock lock_;

// IMPLEMENT_REFCOUNTING(MyClass);

// };

// // Class implementation.

// void MyClass::IncrementValue() {

// // Acquire the lock for the scope of this method.

// base::AutoLock lock_scope(lock_);

// // |value_| can now be modified safely.

// value_++;

// }

///

#define IMPLEMENT_LOCKING(ClassName) \

public: \

class AutoLock { \

public: \

explicit AutoLock(ClassName* base) : base_(base) { base_->Lock(); } \

~AutoLock() { base_->Unlock(); } \

private: \

ClassName* base_; \

DISALLOW_COPY_AND_ASSIGN(AutoLock); \

}; \

void Lock() { lock_.Acquire(); } \

void Unlock() { lock_.Release(); } \

private: \

base::Lock lock_;

#endif // CEF_INCLUDE_CEF_BASE_H_

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