Warning: cast to/from pointer from/to integer of different size

Question

I\'m learning Pthreads. My code executes the way I want it to, I\'m able to use it. But it gives me a warning on compilation.

I compile using:

gcc          


        

Answer 1

A quick hacky fix might just to cast to long instead of int. On a lot of systems, sizeof(long) == sizeof(void *).

A better idea might be to use intptr_t.

int threadnumber = (intptr_t) param;

and

pthread_create(&(tid[i]), &attr, runner, (void *)(intptr_t)i);