The Information Systems Security Association (ISSA) is a not-for-profit, international organization of information security professionals and practitioners. It provides educational forums, publications and peer interaction opportunities that enhance the knowledge, skill and professional growth of its members.
Here is a bunch of links about the grsecurity patches for the Linux 2.4 kernel.
QOS is a concept used in providing better network services. QOS is often implemented to flag specific traffic as more important than others. An alternate use of QOS is simply to limit bandwidth usage.
This document is an introduction to the Posix multi-threads programming method (Normalisation).