| Akash Kankanala | 761955c | 2024-02-21 19:32:20 +0530 | [diff] [blame^] | 1 | /* |
| 2 | * |
| 3 | * Copyright 2022 gRPC authors. |
| 4 | * |
| 5 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | * you may not use this file except in compliance with the License. |
| 7 | * You may obtain a copy of the License at |
| 8 | * |
| 9 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | * |
| 11 | * Unless required by applicable law or agreed to in writing, software |
| 12 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | * See the License for the specific language governing permissions and |
| 15 | * limitations under the License. |
| 16 | * |
| 17 | */ |
| 18 | |
| 19 | package grpcsync |
| 20 | |
| 21 | import ( |
| 22 | "sync" |
| 23 | ) |
| 24 | |
| 25 | // OnceFunc returns a function wrapping f which ensures f is only executed |
| 26 | // once even if the returned function is executed multiple times. |
| 27 | func OnceFunc(f func()) func() { |
| 28 | var once sync.Once |
| 29 | return func() { |
| 30 | once.Do(f) |
| 31 | } |
| 32 | } |