| // Copyright 2018, OpenCensus 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. |
| |
| // +build go1.11 |
| |
| package trace |
| |
| import ( |
| "context" |
| t "runtime/trace" |
| ) |
| |
| func startExecutionTracerTask(ctx context.Context, name string) (context.Context, func()) { |
| if !t.IsEnabled() { |
| // Avoid additional overhead if |
| // runtime/trace is not enabled. |
| return ctx, func() {} |
| } |
| nctx, task := t.NewTask(ctx, name) |
| return nctx, task.End |
| } |