90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/fibers/SimpleLoopController.h>
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#include <folly/io/async/TimeoutManager.h>
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namespace folly {
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namespace fibers {
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/**
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* A simple version of TimeoutManager that maintains only a single AsyncTimeout
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* object that is used by HHWheelTimer in SimpleLoopController.
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*/
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class SimpleLoopController::SimpleTimeoutManager : public TimeoutManager {
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public:
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explicit SimpleTimeoutManager(SimpleLoopController& loopController)
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: loopController_(loopController) {}
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void attachTimeoutManager(
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AsyncTimeout* /* unused */, InternalEnum /* unused */) final {}
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void detachTimeoutManager(AsyncTimeout* /* unused */) final {}
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bool scheduleTimeout(AsyncTimeout* obj, timeout_type timeout) final {
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// Make sure that we don't try to use this manager with two timeouts.
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CHECK(!timeout_ || timeout_->first == obj);
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timeout_.emplace(obj, std::chrono::steady_clock::now() + timeout);
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return true;
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}
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void cancelTimeout(AsyncTimeout* obj) final {
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CHECK(timeout_ && timeout_->first == obj);
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timeout_.reset();
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}
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void bumpHandlingTime() final {}
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bool isInTimeoutManagerThread() final {
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return loopController_.isInLoopThread();
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}
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void runTimeouts() {
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std::chrono::steady_clock::time_point tp = std::chrono::steady_clock::now();
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if (!timeout_ || tp < timeout_->second) {
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return;
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}
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auto* timeout = timeout_->first;
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timeout_.reset();
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timeout->timeoutExpired();
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}
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private:
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SimpleLoopController& loopController_;
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folly::Optional<
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std::pair<AsyncTimeout*, std::chrono::steady_clock::time_point>>
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timeout_;
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};
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SimpleLoopController::SimpleLoopController()
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: fm_(nullptr),
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stopRequested_(false),
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loopThread_(),
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timeoutManager_(std::make_unique<SimpleTimeoutManager>(*this)),
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timer_(HHWheelTimer::newTimer(timeoutManager_.get())) {}
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SimpleLoopController::~SimpleLoopController() {
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scheduled_ = false;
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}
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void SimpleLoopController::runTimeouts() {
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timeoutManager_->runTimeouts();
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}
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} // namespace fibers
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} // namespace folly
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