This works by calling C<getpid ()> on every iteration of the loop,
and thus this might slow down your event loop if you do a lot of loop
-iterations and little real work, but is usually not noticable (on my
+iterations and little real work, but is usually not noticeable (on my
Linux system for example, C<getpid> is actually a simple 5-insn sequence
without a syscall and thus I<very> fast, but my Linux system also has
C<pthread_atfork> which is even faster).