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-/**
- Basic thread-pool tools using Boost.Thread.
- (Jan Botha, 7/2010)
-
- --Simple usage--
- Use SimpleWorker.
- Example, call a function that returns an int in a new thread:
- typedef boost::function<int()> JobType;
- JobType job = boost::bind(funcname);
- //or boost::bind(&class::funcname, this) for a member function
- SimpleWorker<JobType, int> worker(job);
- int result = worker.getResult(); //blocks until result is ready
-
- --Extended usage--
- Use WorkerPool, which uses Queuemt (a synchronized queue) and Worker.
- Example:
- (same context and typedef
- WorkerPool<JobType, int> pool(num_threads);
- JobType job = ...
- pool.addJob(job);
- ...
- pool.get_result(); //blocks until all workers are done, returns the some of their results.
-
- Jobs added to a WorkerPool need to be the same type. A WorkerPool instance should not be reused (e.g. adding jobs) after calling get_result().
-*/
-
-#ifndef WORKERS_HH
-#define WORKERS_HH
-
-#include <iostream>
-#include <boost/bind.hpp>
-#include <boost/function.hpp>
-#include <queue>
-#include <boost/ptr_container/ptr_vector.hpp>
-#include <boost/thread/thread.hpp>
-#include <boost/thread/mutex.hpp>
-#include <boost/thread/shared_mutex.hpp>
-#include <boost/thread/future.hpp>
-#include <boost/thread/condition.hpp>
-
-#include <boost/date_time/posix_time/posix_time_types.hpp>
-#include "timing.h"
-
-/** Implements a synchronized queue*/
-template<typename J>
-class Queuemt
-{
-
-public:
- boost::condition_variable_any cond;
- const bool& running;
-
- Queuemt() { }
- Queuemt(const bool& running) : running(running), maxsize(0), qsize(0)
- {
- }
-
- ~Queuemt() {
- }
-
- J pop()
- {
- J job;
- {
- boost::unique_lock<boost::shared_mutex> qlock(q_mutex);
- while (running && qsize == 0)
- cond.wait(qlock);
-
- if (qsize > 0)
- {
- job = q.front();
- q.pop();
- --qsize;
- }
- }
- if (job)
- cond.notify_one();
- return job;
-
- }
-
- void push(J job)
- {
- {
- boost::unique_lock<boost::shared_mutex> lock(q_mutex);
- q.push(job);
- ++qsize;
- }
- if (qsize > maxsize)
- maxsize = qsize;
-
- cond.notify_one();
- }
-
- int getMaxsize()
- {
- return maxsize;
- }
-
- int size()
- {
- return qsize;
- }
-
-private:
- boost::shared_mutex q_mutex;
- std::queue<J> q;
- int maxsize;
- volatile int qsize;
-};
-
-
-template<typename J, typename R>
-class Worker
-{
-typedef boost::packaged_task<R> PackagedTask;
-public:
- Worker(Queuemt<J>& queue, int id, int num_workers) :
- q(queue), tasktime(0.0), id(id), num_workers(num_workers)
- {
- PackagedTask task(boost::bind(&Worker<J, R>::run, this));
- future = task.get_future();
- boost::thread t(boost::move(task));
- }
-
- R run() //this is called upon thread creation
- {
- R wresult = 0;
- while (isRunning())
- {
- J job = q.pop();
-
- if (job)
- {
- timer.Reset();
- wresult += job();
- tasktime += timer.Elapsed();
- }
- }
- return wresult;
- }
-
- R getResult()
- {
- if (!future.is_ready())
- future.wait();
- assert(future.is_ready());
- return future.get();
- }
-
- double getTaskTime()
- {
- return tasktime;
- }
-
-private:
-
- Queuemt<J>& q;
-
- boost::unique_future<R> future;
-
- bool isRunning()
- {
- return q.running || q.size() > 0;
- }
-
- Timer timer;
- double tasktime;
- int id;
- int num_workers;
-};
-
-template<typename J, typename R>
-class WorkerPool
-{
-typedef boost::packaged_task<R> PackagedTask;
-typedef Worker<J,R> WJR;
-typedef boost::ptr_vector<WJR> WorkerVector;
-public:
-
- WorkerPool(int num_workers)
- {
- q.reset(new Queuemt<J>(running));
- running = true;
- for (int i = 0; i < num_workers; ++i)
- workers.push_back( new Worker<J, R>(*q, i, num_workers) );
- }
-
- ~WorkerPool()
- {
- }
-
- R get_result()
- {
- running = false;
- q->cond.notify_all();
- R tmp = 0;
- double tasktime = 0.0;
- for (typename WorkerVector::iterator it = workers.begin(); it != workers.end(); it++)
- {
- R res = it->getResult();
- tmp += res;
- //std::cerr << "tasktime: " << it->getTaskTime() << std::endl;
- tasktime += it->getTaskTime();
- }
-// std::cerr << " maxQ = " << q->getMaxsize() << std::endl;
- return tmp;
- }
-
- void addJob(J job)
- {
- q->push(job);
- }
-
-private:
-
- WorkerVector workers;
-
- boost::shared_ptr<Queuemt<J> > q;
-
- bool running;
-};
-
-///////////////////
-template <typename J, typename R>
-class SimpleWorker
-{
-typedef boost::packaged_task<R> PackagedTask;
-public:
- SimpleWorker(J& job) : job(job), tasktime(0.0)
- {
- PackagedTask task(boost::bind(&SimpleWorker<J, R>::run, this));
- future = task.get_future();
- boost::thread t(boost::move(task));
- }
-
- R run() //this is called upon thread creation
- {
- R wresult = 0;
-
- assert(job);
- timer.Reset();
- wresult = job();
- tasktime = timer.Elapsed();
- std::cerr << tasktime << " s" << std::endl;
- return wresult;
- }
-
- R getResult()
- {
- if (!future.is_ready())
- future.wait();
- assert(future.is_ready());
- return future.get();
- }
-
- double getTaskTime()
- {
- return tasktime;
- }
-
-private:
-
- J job;
-
- boost::unique_future<R> future;
-
- Timer timer;
- double tasktime;
-
-};
-
-
-
-#endif