C++ tbb::concurrent_bounded_queue类代码示例

    // Call all DOs which are linked to that DOs which have been triggered
    // These method is typically private and called with in a thread related to a priority
    // This thread is typically waiting on a synchronization element
    void run(unsigned inst) {
        std::function<void()> f;

        try {

#ifdef __linux__
            Logger::pLOG->info("DOR-THRD-{} has TID-{}", inst, syscall(SYS_gettid));
#endif

            while (_run_state) {
                _tbbExecutionQueue.pop(f); // Pop of concurrent_bounded_queue waits if queue empty
                f();
            }
        } catch(const tbb::user_abort& abortException) {
            Logger::pLOG->info("Abort DOR-THRD-{}", inst);
            _run_state = false;
        }
        Logger::pLOG->info("DOR-THRD-{} has stopped", inst);
    }

bool computeBiasFeaturesHelper(ParserT& parser,
                               tbb::concurrent_bounded_queue<TranscriptFeatures>& featQueue,
                               size_t& numComplete, size_t numThreads) {

    using stream_manager = jellyfish::stream_manager<std::vector<std::string>::iterator>;
    using sequence_parser = jellyfish::whole_sequence_parser<stream_manager>;

    size_t merLen = 2;
    Kmer lshift(2 * (merLen - 1));
    Kmer masq((1UL << (2 * merLen)) - 1);
    std::atomic<size_t> readNum{0};

    size_t numActors = numThreads;
    std::vector<std::thread> threads;
    auto tstart = std::chrono::steady_clock::now();

    for (auto i : boost::irange(size_t{0}, numActors)) {
        threads.push_back(std::thread(
	        [&featQueue, &numComplete, &parser, &readNum, &tstart, lshift, masq, merLen, numActors]() -> void {

                size_t cmlen, numKmers;
                jellyfish::mer_dna_ns::mer_base_dynamic<uint64_t> kmer(merLen);

                // while there are transcripts left to process
                while (true) { //producer.nextRead(s)) {
                    sequence_parser::job j(parser);
                    // If this job is empty, then we're done
                    if (j.is_empty()) { return; }

                    for (size_t i=0; i < j->nb_filled; ++i) {
                        ++readNum;
                        if (readNum % 100 == 0) {
                            auto tend = std::chrono::steady_clock::now();
                            auto sec = std::chrono::duration_cast<std::chrono::seconds>(tend-tstart);
                            auto nsec = sec.count();
                            auto rate = (nsec > 0) ? readNum / sec.count() : 0;
                            std::cerr << "processed " << readNum << " transcripts (" << rate << ") transcripts/s\r\r";
                        }

                        // we iterate over the entire read
                        const char* start     = j->data[i].seq.c_str();
                        uint32_t readLen      = j->data[i].seq.size();
                        const char* const end = start + readLen;

                        TranscriptFeatures tfeat{};

                        // reset all of the counts
                        numKmers = 0;
                        cmlen = 0;
                        kmer.polyA();

                        // the maximum number of kmers we'd have to store
                        uint32_t maxNumKmers = (readLen >= merLen) ? readLen - merLen + 1 : 0;
                        if (maxNumKmers == 0) { featQueue.push(tfeat); continue; }

                        // The transcript name
                        std::string fullHeader(j->data[i].header);
                        tfeat.name = fullHeader.substr(0, fullHeader.find(' '));
                        tfeat.length = readLen;
                        auto nfact = 1.0 / readLen;

                        // iterate over the read base-by-base
                        size_t offset{0};
                        size_t numChars{j->data[i].seq.size()};
                        while (offset < numChars) {
                            auto c = jellyfish::mer_dna::code(j->data[i].seq[offset]);
                            kmer.shift_left(c);
                            if (jellyfish::mer_dna::not_dna(c)) {
                                cmlen = 0;
                                ++offset;
                                continue;
                            }
                            if (++cmlen >= merLen) {
                                size_t twomer = kmer.get_bits(0, 2*merLen);
                                tfeat.diNucleotides[twomer]++;
                                switch(c) {
                                    case jellyfish::mer_dna::CODE_G:
                                    case jellyfish::mer_dna::CODE_C:
                                        tfeat.gcContent += nfact;
                                        break;
                                }
                            }
                            ++offset;
                        } // end while

                        char lastBase = j->data[i].seq.back();
                        auto c = jellyfish::mer_dna::code(lastBase);
                        switch(c) {
                            case jellyfish::mer_dna::CODE_G:
                            case jellyfish::mer_dna::CODE_C:
                                tfeat.gcContent += nfact;
                                break;
                        }

                        featQueue.push(tfeat);
                    } // end job
                } // end while(true)
            } // end lambda
            ));

//.........这里部分代码省略.........

	safe_ptr<core::basic_frame> get_frame(int hints)
	{
		if(exception_ != nullptr)
			std::rethrow_exception(exception_);

		hints_ = hints;

		safe_ptr<core::basic_frame> frame = core::basic_frame::late();
		if(!frame_buffer_.try_pop(frame))
			graph_->set_tag("late-frame");
		graph_->set_value("output-buffer", static_cast<float>(frame_buffer_.size())/static_cast<float>(frame_buffer_.capacity()));	
		return frame;
	}

 draw_frame last_frame() override
 {
     if (!frame_) {
         buffer_.try_pop(frame_);
     }
     return core::draw_frame::still(frame_);
 }

	channel_consumer()
		: consumer_index_(next_consumer_index())
		, first_frame_available_(first_frame_promise_.get_future())
		, first_frame_reported_(false)
	{
		is_running_ = true;
		current_age_ = 0;
		frame_buffer_.set_capacity(3);
	}

    void trigger(DataObject<D>& d) {
        boost::shared_lock_guard<boost::shared_mutex> lock(d._mtx_links);

        if (d._links.empty())
            return;

        for (auto &p : d._links)
            _tbbExecutionQueue.push(p.second);
    }

	std::shared_ptr<read_frame> receive()
	{
		if(!is_running_)
			return make_safe<read_frame>();
		std::shared_ptr<read_frame> frame;
		
		if (frame_buffer_.try_pop(frame))
			current_age_ = frame->get_age_millis();

		return frame;
	}

    route_producer(std::shared_ptr<route> route, int buffer)
        : route_(route)
        , connection_(route_->signal.connect([this](const core::draw_frame& frame) {
            if (!buffer_.try_push(frame)) {
                graph_->set_tag(diagnostics::tag_severity::WARNING, "dropped-frame");
            }
            graph_->set_value("produce-time", produce_timer_.elapsed() * route_->format_desc.fps * 0.5);
            produce_timer_.restart();
        }))
    {
        buffer_.set_capacity(buffer > 0 ? buffer : route->format_desc.field_count);

        graph_->set_color("late-frame", diagnostics::color(0.6f, 0.3f, 0.3f));
        graph_->set_color("produce-time", caspar::diagnostics::color(0.0f, 1.0f, 0.0f));
        graph_->set_color("consume-time", caspar::diagnostics::color(1.0f, 0.4f, 0.0f, 0.8f));
        graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
        graph_->set_text(print());
        diagnostics::register_graph(graph_);

        CASPAR_LOG(debug) << print() << L" Initialized";
    }

	virtual boost::unique_future<bool> send(const safe_ptr<read_frame>& frame) override
	{
		bool pushed = frame_buffer_.try_push(frame);

		if (pushed && !first_frame_reported_)
		{
			first_frame_promise_.set_value();
			first_frame_reported_ = true;
		}

		return caspar::wrap_as_future(is_running_.load());
	}

	virtual void send(const safe_ptr<basic_frame>& src_frame) override
	{
		bool pushed = frame_buffer_.try_push(src_frame);
//		frame_buffer_.push(src_frame);

		if (pushed && !first_frame_reported_) //changed to fix compilation
		//if (!first_frame_reported_)
		{
			first_frame_promise_.set_value();
			first_frame_reported_ = true;
		}
	}

    draw_frame receive_impl(int nb_samples) override
    {
        core::draw_frame frame;
        if (!buffer_.try_pop(frame)) {
            graph_->set_tag(diagnostics::tag_severity::WARNING, "late-frame");
        } else {
            frame_ = frame;
        }

        graph_->set_value("consume-time", consume_timer_.elapsed() * route_->format_desc.fps * 0.5);
        consume_timer_.restart();
        return frame;
    }

	safe_ptr<basic_frame> receive()
	{
//		comment out to avoid compiler err
		safe_ptr<basic_frame> frame;
//		bool ispoped = frame_buffer_.try_pop(frame);
//		if (frame_buffer_.size() > 0) {
			//frame_buffer_.pop();
//			return basic_frame::late();
//		}
		if (!frame_buffer_.try_pop(frame))
		{
			return basic_frame::late();
		}
		return frame;
	}

	oal_consumer() 
		: container_(16)
		, channel_index_(-1)
		, started_(false)
		, channel_layout_(
				core::default_channel_layout_repository().get_by_name(
						L"STEREO"))
	{
		graph_->set_color("tick-time", diagnostics::color(0.0f, 0.6f, 0.9f));	
		graph_->set_color("dropped-frame", diagnostics::color(0.3f, 0.6f, 0.3f));
		diagnostics::register_graph(graph_);

		is_running_ = true;
		presentation_age_ = 0;
		input_.set_capacity(2);
	}

	virtual boost::unique_future<bool> send(const safe_ptr<core::read_frame>& frame) override
	{
		auto buffer = std::make_shared<audio_buffer_16>(
			core::audio_32_to_16(core::get_rearranged_and_mixed(frame->multichannel_view(), channel_layout_, channel_layout_.num_channels)));

		if (!input_.try_push(std::make_pair(frame, buffer)))
			graph_->set_tag("dropped-frame");

		if (Status() != Playing && !started_)
		{
			sf::SoundStream::Initialize(2, format_desc_.audio_sample_rate);
			Play();
			started_ = true;
		}

		return wrap_as_future(is_running_.load());
	}

	virtual bool OnGetData(sf::SoundStream::Chunk& data) override
	{		
		win32_exception::ensure_handler_installed_for_thread(
				"sfml-audio-thread");
		std::pair<std::shared_ptr<core::read_frame>, std::shared_ptr<audio_buffer_16>> audio_data;

		input_.pop(audio_data); // Block until available

		graph_->set_value("tick-time", perf_timer_.elapsed()*format_desc_.fps*0.5);		
		perf_timer_.restart();

		container_.push_back(std::move(*audio_data.second));
		data.Samples = container_.back().data();
		data.NbSamples = container_.back().size();	
		

		if (audio_data.first)
			presentation_age_ = audio_data.first->get_age_millis();

		return is_running_;
	}