| /* |
| * |
| * Copyright 2017 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #ifndef GRPC_CORE_LIB_GPRPP_ATOMIC_WITH_ATM_H |
| #define GRPC_CORE_LIB_GPRPP_ATOMIC_WITH_ATM_H |
| |
| #include <grpc/support/port_platform.h> |
| |
| #include <grpc/support/atm.h> |
| |
| namespace grpc_core { |
| |
| enum MemoryOrderRelaxed { memory_order_relaxed }; |
| |
| template <class T> |
| class atomic; |
| |
| template <> |
| class atomic<bool> { |
| public: |
| atomic() { gpr_atm_no_barrier_store(&x_, static_cast<gpr_atm>(false)); } |
| explicit atomic(bool x) { |
| gpr_atm_no_barrier_store(&x_, static_cast<gpr_atm>(x)); |
| } |
| |
| bool compare_exchange_strong(bool& expected, bool update, MemoryOrderRelaxed, |
| MemoryOrderRelaxed) { |
| if (!gpr_atm_no_barrier_cas(&x_, static_cast<gpr_atm>(expected), |
| static_cast<gpr_atm>(update))) { |
| expected = gpr_atm_no_barrier_load(&x_) != 0; |
| return false; |
| } |
| return true; |
| } |
| |
| private: |
| gpr_atm x_; |
| }; |
| |
| } // namespace grpc_core |
| |
| #endif /* GRPC_CORE_LIB_GPRPP_ATOMIC_WITH_ATM_H */ |