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