Cuda/uni_mem_allocator.cpp at main · Dym03/Cuda · GitHub

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// ***********************************************************************
//
// Demo program for education in subject
// Computer Architectures and Parallel Systems.
// Petr Olivka, dep. of Computer Science, FEI, VSB-TU Ostrava, 2020/11
// email:petr.olivka@vsb.cz
//
// Uniform memory allocator for class Mat
//
// ***********************************************************************

#include "uni_mem_allocator.h"

cv::UMatData* UniformAllocator::allocate(int dims, const int* sizes, int type,
                   void* data0, size_t* step,
                   AccessFlag_v_3_4 /*flags*/, cv::UMatUsageFlags /*usageFlags*/) const
{
    size_t total = CV_ELEM_SIZE(type);
    for (int i = dims-1; i >= 0; i--)
    {
        if (step)
        {
            if (data0 && step[i] != CV_AUTOSTEP)
            {
                CV_Assert(total <= step[i]);
                total = step[i];
            }
            else
            {
                step[i] = total;
            }
        }

        total *= sizes[i];
    }

    cv::UMatData* u = new cv::UMatData(this);
    u->size = total;

    if (data0)
    {
        u->data = u->origdata = static_cast<uchar*>(data0);
        u->flags |= cv::UMatData::USER_ALLOCATED;
    }
    else
    {
        void* ptr = 0;
        if(cudaMallocManaged(&ptr, total) != cudaSuccess)
        {
            abort();
        }


        u->data = u->origdata = static_cast<uchar*>(ptr);
    }

    return u;
}

bool UniformAllocator::allocate(cv::UMatData* u, AccessFlag_v_3_4 /*accessFlags*/, cv::UMatUsageFlags /*usageFlags*/) const
{
    return (u != NULL);
}

void UniformAllocator::deallocate(cv::UMatData* u) const
{
    if (!u)
        return;

    CV_Assert(u->urefcount >= 0);
    CV_Assert(u->refcount >= 0);

    if (u->refcount == 0)
    {
        if ( !(u->flags & cv::UMatData::USER_ALLOCATED) )
        {
            cudaFree(u->origdata);
            u->origdata = 0;
        }

        delete u;
    }
}