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// Copyright (c) 2011 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 PPAPI_CPP_NON_THREAD_SAFE_REF_COUNT_H_
#define PPAPI_CPP_NON_THREAD_SAFE_REF_COUNT_H_
#include "ppapi/cpp/core.h"
#include "ppapi/cpp/logging.h"
#include "ppapi/cpp/module.h"
/// @file
/// This file defines the APIs for maintaining a reference counter.
namespace pp {
/// A simple reference counter that is not thread-safe. <strong>Note:</strong>
/// in Debug mode, it checks that it is either called on the main thread, or
/// always called on another thread.
class NonThreadSafeRefCount {
public:
/// Default constructor. In debug mode, this checks that the object is being
/// created on the main thread.
NonThreadSafeRefCount()
: ref_(0) {
#ifndef NDEBUG
is_main_thread_ = Module::Get()->core()->IsMainThread();
#endif
}
/// Destructor.
~NonThreadSafeRefCount() {
PP_DCHECK(is_main_thread_ == Module::Get()->core()->IsMainThread());
}
/// AddRef() increments the reference counter.
///
/// @return An int32_t with the incremented reference counter.
int32_t AddRef() {
PP_DCHECK(is_main_thread_ == Module::Get()->core()->IsMainThread());
return ++ref_;
}
/// Release() decrements the reference counter.
///
/// @return An int32_t with the decremeneted reference counter.
int32_t Release() {
PP_DCHECK(is_main_thread_ == Module::Get()->core()->IsMainThread());
return --ref_;
}
private:
int32_t ref_;
#ifndef NDEBUG
bool is_main_thread_;
#endif
};
} // namespace pp
#endif // PPAPI_CPP_NON_THREAD_SAFE_REF_COUNT_H_