Posix threads problem

Question

I am trying to understand pthreads by example. I have made the following code that is giving different answers everytime I run! Could anyone explain the bug please? TIA, Svi

Answer 1

If you mean the order of the answers, yes, it will be different since which thread runs is decided by the Linux scheduler.

To elaborate: Once you create your threads, the order in which they get CPU time depends on the underlying OS scheduler(here, Linux scheduler). This may not be the same everytime.