LAB 1 Excercise 1. Play with Helgrind in Linux – Threads with pthreads library, processes and fork() – 2-3 parallel threads increasing a shared variable 1000x – Test in Helgrind – Add locking – Test in Helgrind – Implement locking with a potential deadlock – Test in Helgrind – Fix to avoid deadlock problems 2. Fix pthr_prime.c – If time permits