Threads/Lightweight Processes

[Collins Williams]

Hi there!

  I'm looking for a package that implements or allows one to implement
threads or lightweight processes under Ultrix.  What I mean by
lightweight processes is a group of independently scheduled streams of
execution each with its own stack but operating in the same address
space.  If anyone out there knows of the availability of something
like this or has any pointers I would appreciate hearing from them.
If this is not a ridiculously frequently asked question and people
indicate an interest I will eventually post a summary.

    Thanks for your time

  Collins Williams