C++ task类代码示例

template<> bool
device<Simulate>::acquire( task& task )
{
    if ( simulator * simulator = task.simulator() )
        return simulator->acquire( task.io_service() );
    return false;
}

template<> bool
device<UserFDK>::readData( task& task, waveform& data )
{
    static std::chrono::high_resolution_clock::time_point __uptime = std::chrono::high_resolution_clock::now();

    IAgMD2LogicDevicePtr spDpuA = task.spAgDrvr()->LogicDevices->Item[L"DpuA"];

	long words_32bits = task.method().nbr_of_s_to_acquire;
    data.method_ = task.method();

    try {
		SAFEARRAY * psaWfmDataRaw(0);
        spDpuA->ReadIndirectInt32(0x11, 0, words_32bits, &psaWfmDataRaw, &data.actualElements_, &data.firstValidElement_);
        // workaround
        data.timestamp_ = std::chrono::duration< uint64_t, std::pico >( std::chrono::high_resolution_clock::now() - __uptime ).count();

		safearray_t<int32_t> sa( psaWfmDataRaw );
        data.d_.resize( words_32bits );
        
		std::copy( sa.data() + data.firstValidElement_, sa.data() + words_32bits, data.d_.begin() );

    } catch ( _com_error& e ) {
        TERR(e,"readData::ReadIndirectInt32");
    }
    return true;
}

template<> bool
device<UserFDK>::acquire( task& task )
{
    //Start the acquisition
    try { task.spAgDrvr()->Acquisition->UserControl->StartSegmentation(); } catch ( _com_error& e ) { TERR(e, "StartSegmentation"); }
    try { task.spAgDrvr()->Acquisition->UserControl->StartProcessing(AgMD2UserControlProcessingType1); } catch ( _com_error& e ) {
        TERR( e, "StartProcessing" ); }
    return true;
}

void interface5::internal::task_base::destroy( task& victim ) {
    __TBB_ASSERT( victim.prefix().ref_count== (ConcurrentWaitsEnabled(victim) ? 1 : 0), "Task being destroyed must not have children" );
    __TBB_ASSERT( victim.state()==task::allocated, "illegal state for victim task" );
    task* parent = victim.parent();
    victim.~task();
    if( parent ) {
        __TBB_ASSERT( parent->state()==task::allocated, "attempt to destroy child of running or corrupted parent?" );
        parent->internal_decrement_ref_count();
        // Despite last reference to *parent removed, it should not be destroyed (documented behavior).
    }
    governor::local_scheduler()->free_task<no_hint>( victim );
}

bool
device_ap240::acquire( task& task )
{
    auto rcode = AcqrsD1_acquire( task.inst() );

    if ( rcode != VI_SUCCESS ) {
        task::checkError( task.inst(), rcode, "device_ap240::acquire",__FILE__,__LINE__,__FUNCTION__);

        if ( rcode == ACQIRIS_ERROR_INSTRUMENT_RUNNING )
            AcqrsD1_stopAcquisition( task.inst() );

        std::this_thread::sleep_for( std::chrono::milliseconds( 1000 ) );
    }
    return rcode == VI_SUCCESS;
}

void interface5::internal::task_base::destroy( task& victim ) {
    // 1 may be a guard reference for wait_for_all, which was not reset because
    // of concurrent_wait mode or because prepared root task was not actually used
    // for spawning tasks (as in structured_task_group).
    __TBB_ASSERT( (intptr_t)victim.prefix().ref_count <= 1, "Task being destroyed must not have children" );
    __TBB_ASSERT( victim.state()==task::allocated, "illegal state for victim task" );
    task* parent = victim.parent();
    victim.~task();
    if( parent ) {
        __TBB_ASSERT( parent->state()==task::allocated, "attempt to destroy child of running or corrupted parent?" );
        parent->internal_decrement_ref_count();
        // Even if the last reference to *parent is removed, it should not be spawned (documented behavior).
    }
    governor::local_scheduler()->free_task<no_hint>( victim );
}

bool
device_ap240::digitizer_setup( task& task, acqrscontrols::ap240::method& m )
{
    assert( m.hor_.mode == 0 );
    
    auto inst = task.inst();
    ViStatus status;

    if ( ( status = AcqrsD1_configHorizontal( inst, m.hor_.sampInterval, m.hor_.delayTime ) ) == ACQIRIS_WARN_SETUP_ADAPTED ) {
        ViReal64 sampInterval, delay;
        if ( AcqrsD1_getHorizontal( inst, &sampInterval, &delay ) == VI_SUCCESS ) {
            std::cerr << boost::format( "sampInterval: %e <= %e, delay: %e <= %e\n" )
                % sampInterval % m.hor_.sampInterval
                % delay % m.hor_.delayTime;
        }
    }
    task::checkError( inst, status, "AcqrsD1_configHorizontal", __FILE__,__LINE__,__FUNCTION__);

    if ( (status = AcqrsD1_configMemory( inst, m.hor_.nbrSamples, nbrSegments )) == ACQIRIS_WARN_SETUP_ADAPTED ) {
        ViInt32 nbrSamples, nSegments;
        if ( AcqrsD1_getMemory( inst, &nbrSamples, &nSegments ) == VI_SUCCESS )
            m.hor_.nbrSamples = nbrSamples;
    } else 
        task::checkError( inst, status, "configMemory",__FILE__,__LINE__,__FUNCTION__);
    
    status = AcqrsD1_configMode( inst, 0, 0, 0 ); // 2 := averaging mode, 0 := normal data acq.
    task::checkError( inst, status, "AcqrsD1_configMode",__FILE__,__LINE__,__FUNCTION__);

    return true;
}

    /// \warning call only from event loop thread, otherwise the behavior is undefined.
    void on_connect(task<std::error_code>::future_move_type future, std::shared_ptr<task<void>::promise_type> promise) {
        const auto ec = future.get();

        if (ec) {
            switch (ec.value()) {
            case asio::error::already_started:
                queue->push_back(promise);
                break;
            case asio::error::already_connected:
                promise->set_value();
                break;
            default:
                promise->set_exception(std::system_error(ec));
                queue.apply([&](queue_type& queue) {
                    for (auto it = queue.begin(); it != queue.end(); ++it) {
                        (*it)->set_exception(std::system_error(ec));
                    }
                    queue.clear();
                });
            }
        } else {
            promise->set_value();
            queue.apply([&](queue_type& queue) {
                for (auto it = queue.begin(); it != queue.end(); ++it) {
                    (*it)->set_value();
                }
                queue.clear();
            });
        }
    }

   void task_pool::process_task(task& tsk)
   {
      if (tsk.m_flags & cTaskFlagObject)
         tsk.m_pObj->execute_task(tsk.m_data, tsk.m_pData_ptr);
      else
         tsk.m_callback(tsk.m_data, tsk.m_pData_ptr);

      atomic_decrement32(&m_num_outstanding_tasks);
   }

bool
device_ap240::waitForEndOfAcquisition( task& task, int timeout )
{
    return AcqrsD1_waitForEndOfAcquisition( task.inst(), ViInt32( timeout ) ) == VI_SUCCESS;
    // case VI_SUCCESS: return success;
    // case ACQIRIS_ERROR_ACQ_TIMEOUT: return error_timeout;
    // case ACQIRIS_ERROR_OVERLOAD: return error_overload; //  if a channel/trigger overload was detected.
    // case ACQIRIS_ERROR_IO_READ: return error_io_read;   //  if a link error has been detected (e.g. PCI link lost).
    // case ACQIRIS_ERROR_INSTRUMENT_STOPPED: return error_stopped; // if the acquisition was not started beforehand
}

    void task_pool::process_task(task &tsk)
    {
        if (tsk.m_flags & cTaskFlagObject)
            tsk.m_pObj->execute_task(tsk.m_data, tsk.m_pData_ptr);
        else
            tsk.m_callback(tsk.m_data, tsk.m_pData_ptr);

        if (atomic_increment32(&m_total_completed_tasks) == m_total_submitted_tasks)
        {
            // Try to signal the semaphore (the max count is 1 so this may actually fail).
            m_all_tasks_completed.try_release();
        }
    }

   void task_pool::process_task(task& tsk)
   {
      if (tsk.m_flags & cTaskFlagObject)
         tsk.m_pObj->execute_task(tsk.m_data, tsk.m_pData_ptr);
      else
         tsk.m_callback(tsk.m_data, tsk.m_pData_ptr);

      m_task_condition_var.lock();

      m_num_outstanding_tasks--;

      m_task_condition_var.unlock();
   }

 tbb::task* execute() {
     // Capture execution order in the very beginning
     int execution_order = 2 - my_successor->decrement_ref_count();
     // Create some local work.
     TaskGenerator& p = *new( allocate_root() ) TaskGenerator(2,2);
     spawn_root_and_wait(p);
     if( execution_order==2 ) { // the "slower" of two peer tasks
         ++nCompletedPairs;
         // Of course execution order can differ from dequeue order.
         // But there is no better approximation at hand; and a single worker
         // will execute in dequeue order, which is enough for our check.
         if (my_enqueue_order==execution_order)
             ++nOrderedPairs;
         FireTwoTasks(my_track);
         destroy(*my_successor);
     }
     return NULL;
 }

template<> bool
device<UserFDK>::waitForEndOfAcquisition( task& task, int timeout )
{
	(void)timeout;
    //Wait for the end of the acquisition

    long wait_for_end = 0x80000000;
    IAgMD2LogicDevicePtr spDpuA = task.spAgDrvr()->LogicDevices->Item[L"DpuA"];	

    int count = 0;
    while ( wait_for_end >= 0x80000000 ) {
        std::this_thread::sleep_for( std::chrono::milliseconds( 200 ) );
        try { spDpuA->ReadRegisterInt32( 0x3308, &wait_for_end ); } catch ( _com_error& e ) { TERR(e, "ReadRegisterInt32"); }
        if ( ++count > 15 ) {
            ADTRACE() << "U5303A::waitForEndOfAcqisition timed out";
            return false;
        }
    }
    return true;
}

bool
device_ap240::initial_setup( task& task, acqrscontrols::ap240::method& m )
{
    ViStatus status;
    ViStatus * pStatus = &status;

    auto inst_ = task.inst();

    if ( ( ( m.channels_ & 03 ) == 03 ) && ( m.hor_.sampInterval < 0.51e-9 ) ) { // if 2ch acquisition, 
        m.hor_.sampInterval = 1.0e-9;
    }

    int nAveragerDelay(0);

    if ( m.hor_.mode == 2 ) {

        m.hor_.nbrSamples = m.hor_.nbrSamples + 32 & ~0x1f; // fold of 32, can't be zero
        double delay = m.hor_.delayTime >= 0 ? m.hor_.delayTime : 0; // averager mode can't be negative
        if ( m.hor_.mode == 0 )
            nAveragerDelay = int32_t( delay / m.hor_.sampInterval + 0.5 ) & ~0x1f;      // fold of 32, can be zero
        else 
            nAveragerDelay = int32_t( delay / m.hor_.sampInterval + 0.5 ) + 32 & ~0x1f; // fold of 32, can't be zero
    }

    // trigger setup
    if ( ( status = AcqrsD1_configTrigClass( inst_
                                             , m.trig_.trigClass, m.trig_.trigPattern, 0, 0, 0, 0 ) )
         == ACQIRIS_WARN_SETUP_ADAPTED ) {
        ViInt32 trigClass, trigPattern, a, b; ViReal64 c, d;
        if ( AcqrsD1_getTrigClass( inst_, &trigClass, &trigPattern, &a, &b, &c, &d ) == VI_SUCCESS ) {
            std::cerr << boost::format( "trigClass: %x <- %x, trigPattern: %x <- %x")
                % trigClass % m.trig_.trigClass % trigPattern % m.trig_.trigPattern << std::endl;
        }
    }
    task::checkError( inst_, status, "AcqrsD1_configTrigClass", __FILE__,__LINE__,__FUNCTION__);
    
    ViInt32 trigChannel = m.trig_.trigPattern & 0x80000000 ? (-1) : m.trig_.trigPattern & 0x3;
    
    status = AcqrsD1_configTrigSource( inst_
                                       , trigChannel
                                       , m.trig_.trigCoupling
                                       , m.trig_.trigSlope //m.ext_trigger_slope // pos(0), neg(1)
                                       , m.trig_.trigLevel1 //m.ext_trigger_level // 500 
                                       , m.trig_.trigLevel2 );
    task::checkError( inst_, status, "AcqrsD1_configTrigSource", __FILE__,__LINE__,__FUNCTION__);

    // vertical setup
    const int chlist [] = { -1, 1, 2 };
    int idx = 0;
    for ( auto& v: { m.ext_, m.ch1_, m.ch2_ } ) {
        int channel = chlist[ idx++ ];
        status = AcqrsD1_configVertical( inst_
                                         , channel
                                         , v.fullScale  
                                         , v.offset     
                                         , v.coupling   
                                         , v.bandwidth );
        // std::cerr << "\tch(" << channel << ") offset: " << v.offset << " fs: " << v.fullScale << std::endl;        
        if ( status == ACQIRIS_WARN_SETUP_ADAPTED ) {
            ViReal64 fullScale, offset; ViInt32 coupling, bandwidth;
            if ( AcqrsD1_getVertical( inst_, channel, &fullScale, &offset, &coupling, &bandwidth ) == VI_SUCCESS ) {
                std::cerr << boost::format( "\tfullscale,offset): (%g,%g) <- (%g,%g)" )
                    % fullScale % offset % v.fullScale % v.offset << std::endl;
            }
        } else
            task::checkError( inst_, status, "configVertical",__FILE__,__LINE__,__FUNCTION__);
    }

    // channels configuration
    if ( m.channels_ == 03 ) { // 2ch simultaneous acquisition

        status = AcqrsD1_configChannelCombination( inst_, 1, m.channels_ ); // all channels use 1 converter each
        task::checkError( inst_, status, "AcqrsD1_configChannelCombination",__FILE__,__LINE__,__FUNCTION__);

    } else {

        status = AcqrsD1_configChannelCombination( inst_, 2, m.channels_ ); // half of the channels use 2 converters each
        task::checkError( inst_, status, "AcqrsD1_configChannelCombination",__FILE__,__LINE__,__FUNCTION__);

    }
    if ( status == ACQIRIS_WARN_SETUP_ADAPTED ) {
        ViInt32 nbrConvertersPerChannel, usedChannels;
        if ( AcqrsD1_getChannelCombination( inst_, &nbrConvertersPerChannel, &usedChannels ) == VI_SUCCESS ) {
            std::cerr << boost::format("ChannelCombination( %x, %x ) <- (%x)" )
                % nbrConvertersPerChannel % &usedChannels % m.channels_ << std::endl;
        }
    }

    if ( m.channels_ & 01 ) {
        status = AcqrsD1_configMultiInput( inst_, 1, 0 ); // channel 1 --> A
        task::checkError( inst_, status, "AcqrsD1_configMultiInput",__FILE__,__LINE__,__FUNCTION__);
    }
    if ( m.channels_ & 02 ) {
        status = AcqrsD1_configMultiInput( inst_, 2, 1 ); // channel 2 --> B
        task::checkError( inst_, status, "AcqrsD1_configMultiInput",__FILE__,__LINE__,__FUNCTION__);
    }
    
    // "IO B" for Acquisition is active
    status = AcqrsD1_configControlIO( inst_, pin_B, 21, 0, 0 );
    task::checkError( inst_, status, "AcqrsD1_configControlIO(B)",__FILE__,__LINE__,__FUNCTION__);
//.........这里部分代码省略.........