1 /* 2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 #ifndef OHOS_ABILITY_BASE_LIGHT_REFBASE_H 16 #define OHOS_ABILITY_BASE_LIGHT_REFBASE_H 17 18 #include <atomic> 19 20 namespace OHOS { 21 namespace AAFwk { 22 class LightRefCountBase { 23 public: 24 inline LightRefCountBase(); 25 26 inline int IncStrongRef(const void *id = nullptr); /* [in] */ 27 28 inline int DecStrongRef(const void *id = nullptr); /* [in] */ 29 30 inline int GetRefCount() const; 31 32 protected: 33 inline virtual ~LightRefCountBase(); 34 35 private: 36 std::atomic<int> refCount_; 37 }; 38 LightRefCountBase()39LightRefCountBase::LightRefCountBase() : refCount_(0) 40 {} 41 ~LightRefCountBase()42LightRefCountBase::~LightRefCountBase() 43 {} 44 IncStrongRef(const void * id)45int LightRefCountBase::IncStrongRef(const void *id) /* [in] */ 46 { 47 const int beforeCount = refCount_.fetch_add(1, std::memory_order_relaxed); 48 return beforeCount + 1; 49 } 50 DecStrongRef(const void * id)51int LightRefCountBase::DecStrongRef(const void *id) /* [in] */ 52 { 53 const int beforeCount = refCount_.fetch_sub(1, std::memory_order_release); 54 if (beforeCount - 1 == 0) { 55 delete this; 56 } 57 return beforeCount - 1; 58 } 59 GetRefCount()60int LightRefCountBase::GetRefCount() const 61 { 62 return refCount_.load(std::memory_order_relaxed); 63 } 64 } // namespace AAFwk 65 } // namespace OHOS 66 #endif // OHOS_ABILITY_BASE_LIGHT_REFBASE_H 67