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The HP DCE package (version 1.5) shipped with HP-UX 10.x provides support for a threads package derived from The Open Group[TM]'s DCE 1.2.1 version which is based on the POSIX.4a draft 4 API and several extensions. In addition, it provides an exception support not specified in the POSIX.4a. HP-UX 10.x DCE threads are user-space threads. For more information on DCE threads, see thr_intro(3). HP-UX 11.x ships with DCE v1.7. In addition, 11.x provides a POSIX threads package based on the POSIX.1c-1996 standard. 11.x POSIX threads are kernel-space threads. For more information on POSIX.1c threads, see pthread(3T). For an in-depth look at threads, pick up a copy of the book: "ThreadTime" by Scott J. Norton and Mark D. DiPasquale, Prentice-Hall, ISBN 0131900676, 1996. Another valuable resource is the comp.programming.threads FAQ: o <http://www.serpentine.com/blog/threads-faq/>