112 lines
3.1 KiB
C++
112 lines
3.1 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/executors/ThreadedExecutor.h>
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#include <chrono>
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#include <glog/logging.h>
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#include <folly/executors/thread_factory/NamedThreadFactory.h>
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#include <folly/system/ThreadName.h>
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namespace folly {
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template <typename F>
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static auto with_unique_lock(std::mutex& m, F&& f) -> decltype(f()) {
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std::unique_lock<std::mutex> lock(m);
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return f();
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}
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ThreadedExecutor::ThreadedExecutor(std::shared_ptr<ThreadFactory> threadFactory)
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: threadFactory_(std::move(threadFactory)) {
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controlt_ = std::thread([this] { control(); });
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}
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ThreadedExecutor::~ThreadedExecutor() {
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stopping_.store(true, std::memory_order_release);
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notify();
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controlt_.join();
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CHECK(running_.empty());
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CHECK(finished_.empty());
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}
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void ThreadedExecutor::add(Func func) {
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CHECK(!stopping_.load(std::memory_order_acquire));
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with_unique_lock(enqueuedm_, [&] { enqueued_.push_back(std::move(func)); });
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notify();
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}
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std::shared_ptr<ThreadFactory> ThreadedExecutor::newDefaultThreadFactory() {
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return std::make_shared<NamedThreadFactory>("Threaded");
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}
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void ThreadedExecutor::notify() {
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with_unique_lock(controlm_, [&] { controls_ = true; });
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controlc_.notify_one();
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}
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void ThreadedExecutor::control() {
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folly::setThreadName("ThreadedCtrl");
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auto looping = true;
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while (looping) {
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controlWait();
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looping = controlPerformAll();
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}
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}
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void ThreadedExecutor::controlWait() {
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constexpr auto kMaxWait = std::chrono::seconds(10);
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std::unique_lock<std::mutex> lock(controlm_);
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controlc_.wait_for(lock, kMaxWait, [&] { return controls_; });
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controls_ = false;
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}
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void ThreadedExecutor::work(Func& func) {
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func();
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auto id = std::this_thread::get_id();
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with_unique_lock(finishedm_, [&] { finished_.push_back(id); });
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notify();
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}
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void ThreadedExecutor::controlJoinFinishedThreads() {
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std::deque<std::thread::id> finishedt;
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with_unique_lock(finishedm_, [&] { std::swap(finishedt, finished_); });
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for (auto id : finishedt) {
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running_[id].join();
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running_.erase(id);
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}
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}
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void ThreadedExecutor::controlLaunchEnqueuedTasks() {
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std::deque<Func> enqueuedt;
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with_unique_lock(enqueuedm_, [&] { std::swap(enqueuedt, enqueued_); });
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for (auto& f : enqueuedt) {
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auto th = threadFactory_->newThread(
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[this, f = std::move(f)]() mutable { work(f); });
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auto id = th.get_id();
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running_[id] = std::move(th);
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}
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}
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bool ThreadedExecutor::controlPerformAll() {
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auto stopping = stopping_.load(std::memory_order_acquire);
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controlJoinFinishedThreads();
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controlLaunchEnqueuedTasks();
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return !stopping || !running_.empty();
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}
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} // namespace folly
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