Common-Description:
 Pth is a very portable POSIX/ANSI-C based library for Unix platforms which
 provides non-preemptive priority-based scheduling for multiple threads of
 execution (aka "multithreading") inside event-driven applications.  All threads
 run in the same address space of the server application, but each thread has
 it's own individual program-counter, run-time stack, signal mask and errno
 variable.