Your data is pretty rusty here :) pthreads as library is of course "usermode layer over something". That something being O(1) kernel space thread implementation. On Tue, 2009-08-11 at 05:37 +0000, Jay K wrote: > > In particular on Linux pthreads are usermode layer over something > else. -- Dragiša Durić <dragisha at m3w.org>