gistfile1.py

import numpy

import pycuda.autoinit
import pycuda.driver as drv
from pycuda.compiler import SourceModule
from pycuda.gpuarray import to_gpu

mod = SourceModule("""
typedef struct _pair
{
    int first;
    int second;
} pair;

__global__ void get_second(int *dest, pair src)
{
  const int i = threadIdx.x;
  dest[i] = src.second;
}
""")

get_second = mod.get_function("get_second")

dtype = numpy.dtype([('first', numpy.int32), ('second', numpy.int32)])

pair_arr = numpy.empty(1, dtype)
pair_arr['first'][0] = 1
pair_arr['second'][0] = 2

pair = pair_arr[0]

dest = to_gpu(numpy.empty(400, numpy.int32))

get_second(dest, pair, block=(400,1,1), grid=(1,1))

assert dest.get() == 2