Re: [arm-gnu] How to check the core execution for each thread?

[Carlos O'Donell <carlos@xxxxxxxxxxxxxxxx>]

Charly Bechara wrote:
> I have a multithreaded C program executing on an MPCore system. I want 
> to know if there is any function from glibc or a kernel system call 
> which can return me the current core where the thread is executing on?

There is no such function call. Even if there was, by the time the 
answer returns to userspace the thread may have been migrated to another 
core.

If you want a thread to run on a specific core you will need to look 
into the CPU affinity functions (sched_set/getaffinity). The affinity 
functions allow you to control which CPU may run the thread (or 
process). Be aware that this interface has changed at least 3 times, and 
requires coordinated glibc and kernel support. I recommend the interface 
which uses cpu_set_t.

Good luck!

Cheers,
Carlos.
--
Carlos O'Donell
CodeSourcery
carlos@xxxxxxxxxxxxxxxx
(650) 331-3385 x716