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Diffstat (limited to 'src/core/lib/gprpp/atomic_with_atm.h')
-rw-r--r-- | src/core/lib/gprpp/atomic_with_atm.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/core/lib/gprpp/atomic_with_atm.h b/src/core/lib/gprpp/atomic_with_atm.h new file mode 100644 index 0000000000..6abf0bc38d --- /dev/null +++ b/src/core/lib/gprpp/atomic_with_atm.h @@ -0,0 +1,55 @@ +/* + * + * 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/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 */ |