133 lines
4.2 KiB
C++
133 lines
4.2 KiB
C++
/*
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* IThreadPool.cpp
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*
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* This source file is part of the FoundationDB open source project
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*
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* Copyright 2013-2022 Apple Inc. and the FoundationDB project authors
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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 "flow/IThreadPool.h"
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#include <algorithm>
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// The ifndef's allow us to compile with pre-built boost. Otherwise, we get
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// errors about double-defines. As of this writing, the automatically downloaded
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// build of boost doesn't define these, but the pre-built version does. (The old
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// prebuilt version was being silently ignored by cmake, so it's unclear when the
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// compatibility divergence started)
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#ifndef BOOST_SYSTEM_NO_LIB
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#define BOOST_SYSTEM_NO_LIB
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#endif
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#ifndef BOOST_DATE_TIME_NO_LIB
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#define BOOST_DATE_TIME_NO_LIB
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#endif
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#ifndef BOOST_REGEX_NO_LIB
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#define BOOST_REGEX_NO_LIB
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#endif
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#include "boost/asio.hpp"
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class ThreadPool final : public IThreadPool, public ReferenceCounted<ThreadPool> {
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struct Thread {
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ThreadPool* pool;
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IThreadPoolReceiver* userObject;
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THREAD_HANDLE handle; // Owned by main thread
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static thread_local IThreadPoolReceiver* threadUserObject;
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explicit Thread(ThreadPool* pool, IThreadPoolReceiver* userObject) : pool(pool), userObject(userObject) {}
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~Thread() { ASSERT_ABORT(!userObject); }
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void run() {
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setThreadPriority(pool->priority());
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threadUserObject = userObject;
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try {
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userObject->init();
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while (pool->ios.run_one() && (pool->mode == Mode::Run))
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;
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} catch (Error& e) {
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TraceEvent(SevError, "ThreadPoolError").error(e);
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}
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delete userObject;
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userObject = nullptr;
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}
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static void dispatch(PThreadAction action) { (*action)(threadUserObject); }
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};
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THREAD_FUNC start(void* p) {
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((Thread*)p)->run();
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THREAD_RETURN;
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}
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std::vector<Thread*> threads;
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boost::asio::io_service ios;
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boost::asio::io_service::work dontstop;
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enum Mode { Run = 0, Shutdown = 2 };
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volatile int mode;
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int stackSize;
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int pri;
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struct ActionWrapper {
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PThreadAction action;
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ActionWrapper(PThreadAction action) : action(action) {}
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// HACK: Boost won't use move constructors, so we just assume the last copy made is the one that will be called
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// or cancelled
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ActionWrapper(ActionWrapper const& r) : action(r.action) { const_cast<ActionWrapper&>(r).action = nullptr; }
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void operator()() {
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Thread::dispatch(action);
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action = nullptr;
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}
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~ActionWrapper() {
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if (action) {
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action->cancel();
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}
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}
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ActionWrapper& operator=(ActionWrapper const&) = delete;
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};
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public:
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ThreadPool(int stackSize, int pri) : dontstop(ios), mode(Run), stackSize(stackSize), pri(pri) {}
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~ThreadPool() override {}
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Future<Void> stop(Error const& e = success()) override {
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if (mode == Shutdown)
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return Void();
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ReferenceCounted<ThreadPool>::addref();
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ios.stop(); // doesn't work?
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mode = Shutdown;
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for (int i = 0; i < threads.size(); i++) {
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waitThread(threads[i]->handle);
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delete threads[i];
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}
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ReferenceCounted<ThreadPool>::delref();
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return Void();
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}
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Future<Void> getError() const override { return Never(); } // FIXME
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void addref() override { ReferenceCounted<ThreadPool>::addref(); }
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void delref() override {
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if (ReferenceCounted<ThreadPool>::delref_no_destroy()) {
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stop();
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delete this;
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}
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}
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void addThread(IThreadPoolReceiver* userData, const char* name) override {
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threads.push_back(new Thread(this, userData));
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threads.back()->handle = g_network->startThread(start, threads.back(), stackSize, name);
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}
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void post(PThreadAction action) override { ios.post(ActionWrapper(action)); }
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int priority() const { return pri; }
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};
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Reference<IThreadPool> createGenericThreadPool(int stackSize, int pri) {
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return Reference<IThreadPool>(new ThreadPool(stackSize, pri));
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}
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thread_local IThreadPoolReceiver* ThreadPool::Thread::threadUserObject;
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