112 lines
3.4 KiB
C++
112 lines
3.4 KiB
C++
/*
|
|
* IThreadPool.cpp
|
|
*
|
|
* This source file is part of the FoundationDB open source project
|
|
*
|
|
* Copyright 2013-2018 Apple Inc. and the FoundationDB project authors
|
|
*
|
|
* 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 "flow/IThreadPool.h"
|
|
|
|
#include <algorithm>
|
|
#define BOOST_SYSTEM_NO_LIB
|
|
#define BOOST_DATE_TIME_NO_LIB
|
|
#define BOOST_REGEX_NO_LIB
|
|
#include "boost/asio.hpp"
|
|
#include "boost/bind.hpp"
|
|
|
|
|
|
class ThreadPool : public IThreadPool, public ReferenceCounted<ThreadPool> {
|
|
struct Thread {
|
|
ThreadPool *pool;
|
|
IThreadPoolReceiver* userObject;
|
|
Event stopped;
|
|
static thread_local IThreadPoolReceiver* threadUserObject;
|
|
explicit Thread(ThreadPool *pool, IThreadPoolReceiver *userObject) : pool(pool), userObject(userObject) {}
|
|
~Thread() { ASSERT_ABORT(!userObject); }
|
|
|
|
void run() {
|
|
deprioritizeThread();
|
|
|
|
threadUserObject = userObject;
|
|
try {
|
|
userObject->init();
|
|
while (pool->ios.run_one() && !pool->mode);
|
|
} catch (Error& e) {
|
|
TraceEvent(SevError, "ThreadPoolError").error(e);
|
|
}
|
|
delete userObject; userObject = 0;
|
|
stopped.set();
|
|
}
|
|
static void dispatch( PThreadAction action ) {
|
|
(*action)(threadUserObject);
|
|
}
|
|
};
|
|
THREAD_FUNC start( void* p ) {
|
|
((Thread*)p)->run();
|
|
THREAD_RETURN;
|
|
}
|
|
|
|
std::vector<Thread*> threads;
|
|
boost::asio::io_service ios;
|
|
boost::asio::io_service::work dontstop;
|
|
enum Mode { Run=0, Shutdown=2 };
|
|
volatile int mode;
|
|
|
|
struct ActionWrapper {
|
|
PThreadAction action;
|
|
ActionWrapper(PThreadAction action) : action(action) {}
|
|
// HACK: Boost won't use move constructors, so we just assume the last copy made is the one that will be called or cancelled
|
|
ActionWrapper(ActionWrapper const& r) : action(r.action) { const_cast<ActionWrapper&>(r).action=NULL; }
|
|
void operator()() { Thread::dispatch(action); action = NULL; }
|
|
~ActionWrapper() { if (action) { action->cancel(); } }
|
|
private:
|
|
void operator=(ActionWrapper const&);
|
|
};
|
|
public:
|
|
ThreadPool() : dontstop(ios), mode(Run) {}
|
|
~ThreadPool() {}
|
|
Future<Void> stop(Error const& e = success()) {
|
|
if (mode == Shutdown) return Void();
|
|
ReferenceCounted<ThreadPool>::addref();
|
|
ios.stop(); // doesn't work?
|
|
mode = Shutdown;
|
|
for(int i=0; i<threads.size(); i++) {
|
|
threads[i]->stopped.block();
|
|
delete threads[i];
|
|
}
|
|
ReferenceCounted<ThreadPool>::delref();
|
|
return Void();
|
|
}
|
|
virtual Future<Void> getError() { return Never(); } // FIXME
|
|
virtual void addref() { ReferenceCounted<ThreadPool>::addref(); }
|
|
virtual void delref() { if (ReferenceCounted<ThreadPool>::delref_no_destroy()) stop(); }
|
|
void addThread( IThreadPoolReceiver* userData ) {
|
|
threads.push_back(new Thread(this, userData));
|
|
startThread(start, threads.back());
|
|
}
|
|
void post( PThreadAction action ) {
|
|
ios.post( ActionWrapper( action ) );
|
|
}
|
|
};
|
|
|
|
|
|
Reference<IThreadPool> createGenericThreadPool()
|
|
{
|
|
return Reference<IThreadPool>( new ThreadPool );
|
|
}
|
|
|
|
thread_local IThreadPoolReceiver* ThreadPool::Thread::threadUserObject;
|