/* * Copyright (c) Meta Platforms, Inc. and affiliates. * * 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. */ #include #include namespace folly { namespace fibers { /** * A simple version of TimeoutManager that maintains only a single AsyncTimeout * object that is used by HHWheelTimer in SimpleLoopController. */ class SimpleLoopController::SimpleTimeoutManager : public TimeoutManager { public: explicit SimpleTimeoutManager(SimpleLoopController& loopController) : loopController_(loopController) {} void attachTimeoutManager( AsyncTimeout* /* unused */, InternalEnum /* unused */) final {} void detachTimeoutManager(AsyncTimeout* /* unused */) final {} bool scheduleTimeout(AsyncTimeout* obj, timeout_type timeout) final { // Make sure that we don't try to use this manager with two timeouts. CHECK(!timeout_ || timeout_->first == obj); timeout_.emplace(obj, std::chrono::steady_clock::now() + timeout); return true; } void cancelTimeout(AsyncTimeout* obj) final { CHECK(timeout_ && timeout_->first == obj); timeout_.reset(); } void bumpHandlingTime() final {} bool isInTimeoutManagerThread() final { return loopController_.isInLoopThread(); } void runTimeouts() { std::chrono::steady_clock::time_point tp = std::chrono::steady_clock::now(); if (!timeout_ || tp < timeout_->second) { return; } auto* timeout = timeout_->first; timeout_.reset(); timeout->timeoutExpired(); } private: SimpleLoopController& loopController_; folly::Optional< std::pair> timeout_; }; SimpleLoopController::SimpleLoopController() : fm_(nullptr), stopRequested_(false), loopThread_(), timeoutManager_(std::make_unique(*this)), timer_(HHWheelTimer::newTimer(timeoutManager_.get())) {} SimpleLoopController::~SimpleLoopController() { scheduled_ = false; } void SimpleLoopController::runTimeouts() { timeoutManager_->runTimeouts(); } } // namespace fibers } // namespace folly