112 lines
3.4 KiB
C++
112 lines
3.4 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 2013-2018 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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#define BOOST_SYSTEM_NO_LIB
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#define BOOST_DATE_TIME_NO_LIB
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#define BOOST_REGEX_NO_LIB
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#include "boost/asio.hpp"
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#include "boost/bind.hpp"
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class ThreadPool : 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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Event stopped;
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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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deprioritizeThread();
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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);
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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; userObject = 0;
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stopped.set();
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}
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static void dispatch( PThreadAction action ) {
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(*action)(threadUserObject);
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}
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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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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 or cancelled
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ActionWrapper(ActionWrapper const& r) : action(r.action) { const_cast<ActionWrapper&>(r).action=NULL; }
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void operator()() { Thread::dispatch(action); action = NULL; }
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~ActionWrapper() { if (action) { action->cancel(); } }
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private:
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void operator=(ActionWrapper const&);
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};
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public:
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ThreadPool() : dontstop(ios), mode(Run) {}
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~ThreadPool() {}
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Future<Void> stop() {
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if (mode == Shutdown) 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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threads[i]->stopped.block();
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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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virtual Future<Void> getError() { return Never(); } // FIXME
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virtual void addref() { ReferenceCounted<ThreadPool>::addref(); }
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virtual void delref() { if (ReferenceCounted<ThreadPool>::delref_no_destroy()) stop(); }
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void addThread( IThreadPoolReceiver* userData ) {
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threads.push_back(new Thread(this, userData));
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startThread(start, threads.back());
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}
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void post( PThreadAction action ) {
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ios.post( ActionWrapper( action ) );
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}
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};
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Reference<IThreadPool> createGenericThreadPool()
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{
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return Reference<IThreadPool>( new ThreadPool );
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}
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thread_local IThreadPoolReceiver* ThreadPool::Thread::threadUserObject;
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