cuda_memory.cu
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	#include <stdio.h>
	#include <cuda.h>
	#include <cuda_runtime.h>
	extern "C" void allocate_cuda_memory(int n){
	double *a;
	int N=*n;
	//a = (float )malloc(n*sizeof(float));
	cudaMallocManaged( (void *)&a, sizeof(double) N );
	cudaDeviceSynchronize();
	return (void *) a;
	}

	extern "C" void deallocate_cuda(double *a){
	cudaFree(a);
	}