// 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_UTILITY_NON_THREAD_SAFE_REF_COUNT_H_ #define PPAPI_UTILITY_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. Note: /// 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_UTILITY_NON_THREAD_SAFE_REF_COUNT_H_