Thread Timer
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/***************************************** ThreadTimer.h Copyright (c) 2017 David Feng Distributed under the MIT License. *****************************************/ #ifndef THREAD_TIMER_H #define THREAD_TIMER_H #include <boost/thread/thread.hpp> #include <boost/thread/condition.hpp> #include <boost/thread/mutex.hpp> #include <iostream> #include <string> #include <map> #include <boost/function.hpp> #include <deque> #include <queue> #include <boost/shared_ptr.hpp> #include <boost/regex.hpp> /* Design a ThreadTimer class that manages as many threads as required, depends on the current number of tasks, to perform deferred concurrent task execution. Tasks are in the form of a function whose signature is to return a string and take an arbitrary number of arguments. Tasks are alone with a time index which is the starting time in the future for it to get executed. The method that ThreadTimer dispatches tasks should return immediately without a waiting time (asynchronous-callback). */ namespace thread_timer { class Timer { public: Timer() : m_time(0), m_destroyed(false), m_worker(std::bind(&Timer::Invoke, this)) {} ~Timer() { { boost::mutex::scoped_lock lock(m_mutex); m_destroyed = true; } m_worker.join(); } int Get() { boost::mutex::scoped_lock lock(m_mutex); return m_time; } private: void Invoke() { while (true) { boost::this_thread::sleep(boost::posix_time::seconds(1)); boost::mutex::scoped_lock lock(m_mutex); if (m_destroyed) break; ++m_time; std::string t = "<" + std::to_string(m_time) + ">"; std::cout << t << std::endl; } } boost::mutex m_mutex; int m_time; bool m_destroyed; boost::thread m_worker; }; struct Future { boost::mutex mutex; std::string result; }; class Worker; class ThreadTimer { friend Worker; public: ThreadTimer(); ~ThreadTimer(); boost::shared_ptr<Future> Dispatch(boost::function0<std::string> f, int time);//any function(whose return type should be string) with arbitrary arguments can be binded to a function object with 0 arguments private: void DispatchHandler(); struct GreaterThan { bool operator()(const std::pair<int, boost::thread::id> & a, const std::pair<int, boost::thread::id> & b) { return a.first > b.first; } }; boost::mutex m_mutex; boost::condition m_condition; std::map<boost::thread::id, Worker *> m_pool; std::deque<boost::thread::id> m_toRemove; std::priority_queue<std::pair<int, boost::thread::id>, std::vector<std::pair<int, boost::thread::id>>, GreaterThan> m_minHeap;//first: time, second: thread id bool m_destroyed; Timer m_timer; boost::thread m_dispatchHandler; }; class Worker { public: Worker(boost::function0<std::string> f, boost::shared_ptr<Future> future, ThreadTimer * t); ~Worker(); boost::thread::id GetId() const; void Start(); private: void Invoke(); boost::shared_ptr<boost::mutex> m_mutex_f; boost::shared_ptr<boost::condition> m_condition_f; boost::shared_ptr<boost::function0<std::string> > m_f; boost::shared_ptr<Future> m_future; ThreadTimer * m_ThreadTimer; boost::shared_ptr<boost::mutex> m_mutex; boost::shared_ptr<bool> m_destroyed; boost::shared_ptr<bool> m_exited; boost::thread m_worker; }; Worker::Worker(boost::function0<std::string> f, boost::shared_ptr<Future> future, ThreadTimer * t) : m_mutex_f(new boost::mutex()), m_condition_f(new boost::condition()), m_f(new boost::function0<std::string>(f)), m_future(future), m_ThreadTimer(t) , m_mutex(new boost::mutex()), m_destroyed(new bool(false)), m_exited(new bool(false)) , m_worker(std::bind(&Worker::Invoke, this)) { } Worker::~Worker() { /*critical section: main*/ boost::mutex::scoped_lock lock(*m_mutex); *m_destroyed = true; if (!(*m_exited)) { m_worker.interrupt(); m_worker.detach(); } } boost::thread::id Worker::GetId() const { return m_worker.get_id(); } void Worker::Start() { /*critical section: f*/ boost::mutex::scoped_lock lock(*m_mutex_f); m_condition_f->notify_one(); } void Worker::Invoke() { boost::shared_ptr<boost::mutex> scoped_m_mutex_f = m_mutex_f; boost::shared_ptr<boost::condition> scoped_m_condition_f = m_condition_f; boost::shared_ptr<boost::function0<std::string> > scoped_m_f = m_f; boost::shared_ptr<Future> scoped_m_future = m_future; boost::shared_ptr<boost::mutex> scoped_m_mutex = m_mutex; boost::shared_ptr<bool> scoped_m_destroyed = m_destroyed; boost::shared_ptr<bool> scoped_m_exited = m_exited; { /*critical section: f*/ boost::mutex::scoped_lock lock(*scoped_m_mutex_f); scoped_m_condition_f->wait(lock); try { boost::mutex::scoped_lock lock(scoped_m_future->mutex); scoped_m_future->result = (*scoped_m_f)(); } catch (boost::thread_interrupted &) { } catch (std::exception &) { } catch (...) { } } /*critical section: main*/ boost::mutex::scoped_lock lock(*scoped_m_mutex); if (!(*scoped_m_destroyed)) { //let m_dispatchHandler thread to destroy boost::mutex::scoped_lock lock(m_ThreadTimer->m_mutex);//nested lock: potential deadlock !! m_ThreadTimer->m_condition.notify_one(); m_ThreadTimer->m_toRemove.push_back(boost::this_thread::get_id()); } *scoped_m_exited = true; } ThreadTimer::ThreadTimer() : m_mutex(), m_condition(), m_pool(), m_toRemove(), m_minHeap(), m_destroyed(false) , m_dispatchHandler(std::bind(&ThreadTimer::DispatchHandler, this)) { } ThreadTimer::~ThreadTimer() { { boost::mutex::scoped_lock lock(m_mutex); m_destroyed = true; m_condition.notify_one(); } m_dispatchHandler.join();//wait until all Workers have been destroyed } boost::shared_ptr<Future> ThreadTimer::Dispatch(boost::function0<std::string> f, int time) { boost::mutex::scoped_lock lock(m_mutex); boost::shared_ptr<Future> future(new Future); if (!m_destroyed) { Worker * w = new Worker(f, future, this); m_pool.emplace(w->GetId(), w); m_minHeap.emplace(time, w->GetId()); m_condition.notify_one(); } return future; } void ThreadTimer::DispatchHandler() { boost::mutex::scoped_lock lock(m_mutex); while (true) { if (m_destroyed) { lock.unlock();//unlock m_mutex before invoking Worker::dtor to avoid deadlock for (const auto & p : m_pool) delete p.second; m_pool.clear(); //std::cout << "delete" << std::endl; break; } while (!m_toRemove.empty()) { auto itr = m_pool.find(m_toRemove.front()); if (itr != m_pool.end()) { delete itr->second; m_pool.erase(itr); } else std::cout << "ThreadTimer Error: Can't find thread id in pool: " << m_toRemove.front() << std::endl; m_toRemove.pop_front(); } if (m_minHeap.empty()) m_condition.wait(lock); else { int timeToSleep = m_minHeap.top().first - m_timer.Get(); if (timeToSleep >= 1) { lock.unlock(); //std::cout << "sleep" << std::endl; boost::this_thread::sleep(boost::posix_time::seconds(timeToSleep)); //std::cout << "wakeup" << std::endl; lock.lock(); } m_pool[m_minHeap.top().second]->Start(); m_minHeap.pop(); } } } /*the following functions are for test*/ std::string aLoop(std::string arg, int time, int count) { arg += ","; for (int i = 0; i < count; ++i) std::cout << arg; std::ostringstream oss; oss << "[" << arg << boost::this_thread::get_id() << "," << time << "," << count << "]"; return oss.str(); } void Test() { std::cout << "Hit ENTER -> ThreadTimer: construct a ThreadTimer object. "; std::cin.ignore(); ThreadTimer t; std::cout << "Hit ENTER -> ThreadTimer: dispatch 80 parallel tasks in a random starting time of [3:12] seconds. "; std::cin.ignore(); std::vector<boost::shared_ptr<Future> > res; std::map<int, std::vector<int>> timeMap;//first: time, second: nums to print at that time for (int i = 0; i < 80; ++i) { int time = rand() % 10 + 3; res.push_back(t.Dispatch(std::bind(aLoop, std::to_string(i), time, 1), time)); timeMap[time].push_back(i); } std::cout << "Hit ENTER -> ThreadTimer: print 80 tasks' results [task_id,thread_id,starting_time,loop_count]. "; std::cin.ignore(); std::ostringstream oss; std::map<std::string, int> tMap;//first: thread id, second: count for (const auto & p : res) { oss << (*p).result << ","; boost::match_results<std::string::const_iterator> matched_packet; if (boost::regex_search(p->result.cbegin(), p->result.cend(), matched_packet, boost::regex("(?<=,).*?(?=,)"))) { if (!matched_packet[0].str().empty()) { ++tMap[matched_packet[0].str()]; } } } std::cout << oss.str() << std::endl; oss.str(std::string()); std::cout << "Hit ENTER -> ThreadTimer: print starting_time and corresponding task_ids. "; std::cin.ignore(); for (const auto & p : timeMap) { oss << p.first << ": "; for (const auto & i : p.second) { oss << i << ","; } oss << std::endl; } std::cout << oss.str() << std::endl; oss.str(std::string()); std::cout << "Hit ENTER -> ThreadTimer: print [thread_id,occurrence_count]. "; std::cin.ignore(); for (const auto & p : tMap) { oss << "[" << p.first << "," << p.second << "],"; } std::cout << oss.str() << std::endl; std::cout << "Hit ENTER -> ThreadTimer: destroy the ThreadTimer object. "; std::cin.ignore(); } } #endif |