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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_BASE_THREAD_CHECKER_H_

#define CEF_INCLUDE_BASE_THREAD_CHECKER_H_

#pragma once

#if defined(BASE_THREADING_THREAD_CHECKER_H_)

// Do nothing if the Chromium header has already been included.

// This can happen in cases where Chromium code is used directly by the

// client application. When using Chromium code directly always include

// the Chromium header first to avoid type conflicts.

#elif defined(BUILDING_CEF_SHARED)

// When building CEF include the Chromium header directly.

#include "base/threading/thread_checker.h"

#else // !BUILDING_CEF_SHARED

// The following is substantially similar to the Chromium implementation.

// If the Chromium implementation diverges the below implementation should be

// updated to match.

#include "include/base/cef_logging.h"

#include "include/base/internal/cef_thread_checker_impl.h"

// Apart from debug builds, we also enable the thread checker in

// builds with DCHECK_ALWAYS_ON so that trybots and waterfall bots

// with this define will get the same level of thread checking as

// debug bots.

#if DCHECK_IS_ON()

#define ENABLE_THREAD_CHECKER 1

#else

#define ENABLE_THREAD_CHECKER 0

#endif

namespace base {

namespace cef_internal {

// Do nothing implementation, for use in release mode.

// Note: You should almost always use the ThreadChecker class to get the

// right version for your build configuration.

class ThreadCheckerDoNothing {

public:

bool CalledOnValidThread() const {

return true;

}

void DetachFromThread() {}

};

} // namespace cef_internal

// ThreadChecker is a helper class used to help verify that some methods of a

// class are called from the same thread. It provides identical functionality to

// base::NonThreadSafe, but it is meant to be held as a member variable, rather

// than inherited from base::NonThreadSafe.

// While inheriting from base::NonThreadSafe may give a clear indication about

// the thread-safety of a class, it may also lead to violations of the style

// guide with regard to multiple inheritance. The choice between having a

// ThreadChecker member and inheriting from base::NonThreadSafe should be based

// on whether:

// - Derived classes need to know the thread they belong to, as opposed to

// having that functionality fully encapsulated in the base class.

// - Derived classes should be able to reassign the base class to another

// thread, via DetachFromThread.

// If neither of these are true, then having a ThreadChecker member and calling

// CalledOnValidThread is the preferable solution.

// Example:

// class MyClass {

// public:

// void Foo() {

// DCHECK(thread_checker_.CalledOnValidThread());

// ... (do stuff) ...

// }

// private:

// ThreadChecker thread_checker_;

// }

// In Release mode, CalledOnValidThread will always return true.

#if ENABLE_THREAD_CHECKER

class ThreadChecker : public cef_internal::ThreadCheckerImpl {

};

#else

class ThreadChecker : public cef_internal::ThreadCheckerDoNothing {

};

#endif // ENABLE_THREAD_CHECKER

#undef ENABLE_THREAD_CHECKER

} // namespace base

#endif // !BUILDING_CEF_SHARED

#endif // CEF_INCLUDE_BASE_THREAD_CHECKER_H_

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