1// Copyright 2018, OpenCensus Authors 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// +build go1.11 16 17package trace 18 19import ( 20 "context" 21 t "runtime/trace" 22) 23 24func startExecutionTracerTask(ctx context.Context, name string) (context.Context, func()) { 25 if !t.IsEnabled() { 26 // Avoid additional overhead if 27 // runtime/trace is not enabled. 28 return ctx, func() {} 29 } 30 nctx, task := t.NewTask(ctx, name) 31 return nctx, task.End 32} 33