Order of running threads in pthreads

Question

In the following program, what are the possibilities for the ordering of threads? Assuming \"function\" will print thread id which is unique (since here we have only one process

Answer 1

I don't think there will be any specific ordering. Threads on the modern machines are executed in parallel and its not deterministic which thread's print statements will get executed first !

The only ordering constraint that can be assumed is that thread 2 will come before thread 1 because of second pthread_join