Thread affinity in linux

Question

I have made an application in c which creates 4 threads. How can I check which thread is running on which core through terminal and through code.

Have you tried pthread_getaffinity_np() ? man7.org/linux/man-pages/man3/pthread_setaffinity_np.3.html — Sergei Kulik
Possible duplicate of stackoverflow.com/questions/16381138/… — roottraveller
Normally, the OS distributes threads to the different CPUs, so any CPU that it's running on right now may or may not be the same CPU it's running on in a millisecond. However, you can control thread affinity with POSIX threads, which Linux supports, or you can use e.g. a tool like htop to assign threads/processes to CPUs. — Ulrich Eckhardt
@SergeiKulik pthread_getaffinity_np() is always returning 0, even though I am setting affinity using pthread_setaffinity_np(). — Barinder Grewal
What does the manpage have to say about that particular returnvalue? — Ulrich Eckhardt

Barinder Grewal Barinder Grewal · Accepted Answer · 2015-12-30T06:14:43

I found the answer about how to check it using terminal.
/home# for i in $(pgrep applicationName); do ps -mo pid,tid,fname,user,psr -p $i;done