how to set pointer to a memory to NULL using memset?

Question

I have a structure

typedef struct my_s {

   int x;
   ...
} my_T;

my_t * p_my_t;

I want to set the address of p_my_t to

Answer 1

From reading your multi-thread comments I should say there is no safe sequence of code to accomplish your task. You will have to step back and reexamine your algorithm.