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// Copyright (c) 2006-2008 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_NON_THREAD_SAFE_H__
#define BASE_NON_THREAD_SAFE_H__
#pragma once
#include "base/platform_thread.h"
// 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 NonThreadSafe {
// public:
// void Foo() {
// DCHECK(CalledOnValidThread());
// ... (do stuff) ...
// }
// }
//
// In Release mode, CalledOnValidThread will always return true.
//
#ifndef NDEBUG
class NonThreadSafe {
public:
NonThreadSafe();
~NonThreadSafe();
bool CalledOnValidThread() const;
private:
PlatformThreadId valid_thread_id_;
};
#else
// Do nothing in release mode.
class NonThreadSafe {
public:
NonThreadSafe() {}
~NonThreadSafe() {}
bool CalledOnValidThread() const {
return true;
}
};
#endif // NDEBUG
#endif // BASE_NON_THREAD_SAFE_H__
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