Add char arrays in cuda

问题

I am trying to add 2 char arrays in cuda, but nothing is working. I tried to use:

char temp[32];
strcpy(temp, my_array);
strcat(temp, my_array_2);

When I used this in kernel - I am getting error : calling a __host__ function("strcpy") from a __global__ function("Process") is not allowed

After this, I tried to use these functions in host, not in kernel - no error,but after addition I am getting strange symbols like ĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶĶ.

So, how I can add two ( or more ) char arrays in CUDA ?

回答1:

So, how I can add two ( or more ) char arrays in CUDA ?

write your own functions:

__device__ char * my_strcpy(char *dest, const char *src){
  int i = 0;
  do {
    dest[i] = src[i];}
  while (src[i++] != 0);
  return dest;
}

__device__ char * my_strcat(char *dest, const char *src){
  int i = 0;
  while (dest[i] != 0) i++;
  my_strcpy(dest+i, src);
  return dest;
}

And while we're at it, here is strcmp

回答2:

As the error message explains, you are trying to call host functions ("CPU functions") from a global kernel ("GPU function"). Within a global kernel you only have access to functions provided by the CUDA runtime API, which doesn't include the C standard library (where strcpy and strcat are defined).

You have to create your own str* functions according to what you want to do. Do you want to concatenate an array of chars in parallel, or do it serially in each thread?

来源：https://stackoverflow.com/questions/20201335/add-char-arrays-in-cuda

标签

arrays

cuda

char

addition