How to know on which physical processor and on which physical core my code is running

Question

How can I know in a C program, on which physical processor and core my code is running? I\'m using Linux and gcc 4.4.3.

Answer 1

By and large it's hard to find this out in a meaningful way. Your thread will often run on many different processors during its life. You could call a function to ask which processor you are on and get a context switch whilst the function is executing. What should the function return?