| /* |
| * |
| * Copyright 2022 gRPC 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. |
| * |
| */ |
| |
| package grpcsync |
| |
| import ( |
| "sync" |
| ) |
| |
| // OnceFunc returns a function wrapping f which ensures f is only executed |
| // once even if the returned function is executed multiple times. |
| func OnceFunc(f func()) func() { |
| var once sync.Once |
| return func() { |
| once.Do(f) |
| } |
| } |