1 | /* |
2 | * Copyright 2018-present Facebook, Inc. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | #pragma once |
18 | |
19 | #include <memory> |
20 | #include <thread> |
21 | |
22 | #include <folly/ScopeGuard.h> |
23 | #include <folly/executors/thread_factory/ThreadFactory.h> |
24 | |
25 | namespace folly { |
26 | |
27 | class InitThreadFactory : public ThreadFactory { |
28 | public: |
29 | explicit InitThreadFactory( |
30 | std::shared_ptr<ThreadFactory> threadFactory, |
31 | Func&& threadInitializer, |
32 | Func&& threadFinializer = [] {}) |
33 | : threadFactory_(std::move(threadFactory)), |
34 | threadInitFini_(std::make_shared<ThreadInitFini>( |
35 | std::move(threadInitializer), |
36 | std::move(threadFinializer))) {} |
37 | |
38 | std::thread newThread(Func&& func) override { |
39 | return threadFactory_->newThread( |
40 | [func = std::move(func), threadInitFini = threadInitFini_]() mutable { |
41 | threadInitFini->initializer(); |
42 | SCOPE_EXIT { |
43 | threadInitFini->finalizer(); |
44 | }; |
45 | func(); |
46 | }); |
47 | } |
48 | |
49 | private: |
50 | std::shared_ptr<ThreadFactory> threadFactory_; |
51 | struct ThreadInitFini { |
52 | ThreadInitFini(Func&& init, Func&& fini) |
53 | : initializer(std::move(init)), finalizer(std::move(fini)) {} |
54 | |
55 | Func initializer; |
56 | Func finalizer; |
57 | }; |
58 | std::shared_ptr<ThreadInitFini> threadInitFini_; |
59 | }; |
60 | |
61 | } // namespace folly |
62 | |