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+/*
+ *
+ * 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 */