1 // Copyright 2021 Google LLC 2 // 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 #include "fcp/tracing/tracing_span_id.h" 16 17 namespace fcp { 18 19 std::atomic<std::int64_t> TracingSpanId::id_source = 1; 20 NextUniqueId()21TracingSpanId TracingSpanId::NextUniqueId() { 22 std::int64_t new_id = id_source.fetch_add(1, std::memory_order_seq_cst); 23 return TracingSpanId(new_id); 24 } 25 26 } // namespace fcp 27