2 * Copyright 2015 Facebook, Inc.
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
8 * http://www.apache.org/licenses/LICENSE-2.0
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.
20 #include <folly/experimental/fibers/LoopController.h>
21 #include <folly/io/async/EventBase.h>
27 namespace folly { namespace fibers {
31 class EventBaseLoopController : public LoopController {
33 explicit EventBaseLoopController();
34 ~EventBaseLoopController();
37 * Attach EventBase after LoopController was created.
39 void attachEventBase(folly::EventBase& eventBase);
41 folly::EventBase* getEventBase() {
46 class ControllerCallback : public folly::EventBase::LoopCallback {
48 explicit ControllerCallback(EventBaseLoopController& controller)
49 : controller_(controller) {}
51 void runLoopCallback() noexcept override { controller_.runLoop(); }
54 EventBaseLoopController& controller_;
57 class DestructionCallback : public folly::EventBase::LoopCallback {
59 DestructionCallback() : alive_(new int(42)) {}
60 ~DestructionCallback() { reset(); }
62 void runLoopCallback() noexcept override { reset(); }
64 std::weak_ptr<void> getWeak() { return {alive_}; }
68 std::weak_ptr<void> aliveWeak(alive_);
71 while (!aliveWeak.expired()) {
72 // Spin until all operations requiring EventBaseLoopController to be
73 // alive are complete.
77 std::shared_ptr<void> alive_;
80 bool awaitingScheduling_{false};
81 folly::EventBase* eventBase_{nullptr};
82 ControllerCallback callback_;
83 DestructionCallback destructionCallback_;
84 FiberManager* fm_{nullptr};
85 std::atomic<bool> eventBaseAttached_{false};
86 std::weak_ptr<void> aliveWeak_;
88 /* LoopController interface */
90 void setFiberManager(FiberManager* fm) override;
91 void schedule() override;
92 void cancel() override;
94 void scheduleThreadSafe(std::function<bool()> func) override;
95 void timedSchedule(std::function<void()> func, TimePoint time) override;
97 friend class FiberManager;
102 #include "EventBaseLoopController-inl.h"