double_buffer.hpp

// Copyright (c) 2017-2019 Advanced Micro Devices, Inc. All rights reserved.
//
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// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
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#ifndef ROCPRIM_TYPES_DOUBLE_BUFFER_HPP_
#define ROCPRIM_TYPES_DOUBLE_BUFFER_HPP_

#include "../config.hpp"


BEGIN_ROCPRIM_NAMESPACE

template<class T>
class double_buffer
{
    T * buffers[2];

    unsigned int selector;

public:

    ROCPRIM_HOST_DEVICE inline
    double_buffer()
    {
        selector = 0;
        buffers[0] = nullptr;
        buffers[1] = nullptr;
    }

    ROCPRIM_HOST_DEVICE inline
    double_buffer(T * current, T * alternate)
    {
        selector = 0;
        buffers[0] = current;
        buffers[1] = alternate;
    }

    ROCPRIM_HOST_DEVICE inline
    T * current() const
    {
        return buffers[selector];
    }

    ROCPRIM_HOST_DEVICE inline
    T * alternate() const
    {
        return buffers[selector ^ 1];
    }

    ROCPRIM_HOST_DEVICE inline
    void swap()
    {
        selector ^= 1;
    }
};

END_ROCPRIM_NAMESPACE

// end of group utilsmodule

#endif // ROCPRIM_TYPES_DOUBLE_BUFFER_HPP_