pingpong_queues.h

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/*
 * nvbio
 * Copyright (c) 2011-2014, NVIDIA CORPORATION. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    * Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above copyright
 *      notice, this list of conditions and the following disclaimer in the
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 *      names of its contributors may be used to endorse or promote products
 *      derived from this software without specific prior written permission.
 * 
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#include <nvbio/basic/cuda/arch.h>
#include <nvbio/basic/thrust_view.h>

#pragma once

namespace nvbio {
namespace cuda {





template <typename T = uint32>
struct PingPongQueuesView
{
    uint32          in_size;
    const T*        in_queue;
    uint32*         out_size;
    T*              out_queue;
};

template <typename T = uint32>
struct PingPongQueues
{
    typedef PingPongQueuesView<T> device_view_type;
    typedef PingPongQueuesView<T> plain_view_type;

    uint32                          in_size;
    thrust::device_vector<T>        in_queue;
    thrust::device_vector<uint32>   out_size;
    thrust::device_vector<T>        out_queue;

    uint64 resize_arena(const uint32 size, const bool do_alloc = true)
    {
        if (do_alloc)
        {
            in_size = 0;
            in_queue.resize( size );
            out_queue.resize( size );
            out_size.resize(1);
        }
        return 2u*size*sizeof(T) + sizeof(uint32);
    }

    void resize(const uint32 size) { in_size = size; }

    void clear_output() { out_size[0] = 0; }

    void swap()
    {
        in_size = out_size[0];
        in_queue.swap( out_queue );
    }

    const T* raw_input_queue() const { return nvbio::device_view( in_queue ); }

    const T* raw_output_queue() const { return nvbio::device_view( out_queue ); }

    T* raw_output_queue() { return nvbio::device_view( out_queue ); }

    uint32 output_size() const { return out_size[0]; }

    device_view_type device_view()
    {
        device_view_type q;
        q.in_size   = in_size;
        q.in_queue  = nvbio::device_view( in_queue );
        q.out_size  = nvbio::device_view( out_size );
        q.out_queue = nvbio::device_view( out_queue );
        return q;
    }
};


} // namespace cuda

template <typename T>
cuda::PingPongQueuesView<T> device_view(cuda::PingPongQueues<T>& queues) { return queues.device_view(); }

template <typename T>
cuda::PingPongQueuesView<T> plain_view(cuda::PingPongQueues<T>& queues) { return queues.device_view(); }

} // namespace nvbio