Simon Pickles wrote:

Hi,

I am trying to implement a simple producer/consumer system with two or more threads.

The main thread has a consumer class which creates producers. These producers perform synchronous blocking operations then post their outcome into a std::vector of results which was passed from the main consumer.

class consumer { public: consumer() { m_results = boost::shared_ptr<std::vector<result> >( new std::vector<result> ); new producer( m_results, m_mutex ); // do a single task and put result in m_results }

void Process() { result r; { boost::mutex::scoped_lock lock(m_mutex); r = m_results.pop.front(); } // Do stuff with r }

private: boost::mutex m_mutex; boost::shared_ptr<std::vector<result> > m_results; };

class producer { producer( boost::shared_ptr<std::vector<result> > results, boost::mutex& mtx ) { boost::thread( boost::bind( &DoInThread, this, results, mtx ) ); // actually uses a threadpool but not relevant here. }

void DoInThread( boost::shared_ptr<std::vector<result> > results, boost::mutex& mtx ) { result r; // do long async op and store in r boost::mutex::scoped_lock lock(mtx); results->push_back(r); } };

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I am trying to share a single mutex with both producer and consumer. However I get a noncopyable error, even if I pass a reference.

Can anyone point out what the correct approach is?

Thanks

Simon

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Okay, I think my problem is that I cannot pass the mutex reference as an argument in boost::bind. Is there a workaround? Si