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// Copyright 2008, Google Inc.
// All rights reserved.
//
// 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 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 BASE_NON_THREAD_SAFE_H__
#define BASE_NON_THREAD_SAFE_H__
#include "base/logging.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();
protected:
bool CalledOnValidThread() const;
private:
int32 valid_thread_id_;
};
#else
// Do nothing in release mode.
class NonThreadSafe {
public:
NonThreadSafe() {}
~NonThreadSafe() {}
protected:
bool CalledOnValidThread() const {
return true;
}
};
#endif // NDEBUG
#endif // BASE_NON_THREAD_SAFE_H__
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