1 /* 2 * Copyright 2020 Google LLC 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "fcp/base/process_unique_id.h" 18 19 namespace fcp { 20 21 namespace { 22 // This will be zero-initialized. 23 std::atomic<uint64_t> next_id; 24 } // namespace 25 Next()26ProcessUniqueId ProcessUniqueId::Next() { 27 return ProcessUniqueId(next_id.fetch_add(1, std::memory_order_relaxed)); 28 } 29 30 } // namespace fcp 31