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// 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.
#ifndef BASE_THREADING_NON_THREAD_SAFE_H_
#define BASE_THREADING_NON_THREAD_SAFE_H_
#pragma once
#ifndef NDEBUG
#include "base/threading/non_thread_safe_impl.h"
#endif
namespace base {
// Do nothing implementation of NonThreadSafe, for release mode.
//
// Note: You should almost always use the NonThreadSafe class to get
// the right version of the class for your build configuration.
class NonThreadSafeDoNothing {
public:
bool CalledOnValidThread() const {
return true;
}
protected:
void DetachFromThread() {}
};
// NonThreadSafe is a helper class used to help verify that methods of a
// class are called from the same thread. One can inherit from this class
// and use CalledOnValidThread() to verify.
//
// This is intended to be used with classes that appear to be thread safe, but
// aren't. For example, a service or a singleton like the preferences system.
//
// Example:
// class MyClass : public base::NonThreadSafe {
// public:
// void Foo() {
// DCHECK(CalledOnValidThread());
// ... (do stuff) ...
// }
// }
//
// In Release mode, CalledOnValidThread will always return true.
//
#ifndef NDEBUG
class NonThreadSafe : public NonThreadSafeImpl {
};
#else
class NonThreadSafe : public NonThreadSafeDoNothing {
};
#endif // NDEBUG
} // namespace base
#endif // BASE_NON_THREAD_SAFE_H_
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