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From: ohk@ultra.tfdt-o.nta.no (Ole-Hjalmar Kristensen FOU.TD/DELAB)
Subject: Re: Ada versus Java - Tasking
Date: 1997/01/20
Message-ID: <OHK.97Jan20160512@ultra.tfdt-o.nta.no>#1/1
X-Deja-AN: 211043341
references: <01bc03ee$594dc520$829d6482@joy.ericsson.se>
organization: Telenor Online Public Access
newsgroups: comp.lang.ada
Date: 1997-01-20T00:00:00+00:00
List-Id: <comp.lang.ada>


In article <5bvt6v$sik@mdnews.btv.ibm.com> pontius@btv.ibm.com (Dale Pontius) writes:

   In article <1997Jan19.122511.1@eisner>,
           kilgallen@eisner.decus.org (Larry Kilgallen) writes:
   >
   > Operating system developers have a much better chance to make the
   > scheduling interact with the hardware properly, so I think the better
   > choices are:
   >
   >       1) Rely on OS threading support, and wait for improvements.
   >
   >       2) Lobby the operating system provider for better support,
   >          using all methods available, including examples of other
   >          operating systems which do it better, either on the same
   >          hardware or some other hardware.
   >
           3) Adopt another thing from NT, fibers. Leave a thread to
              be defined as something that is scheduled by the kernel,
              but add a structure like NT fibers or user threads, that
              is scheduled in the user space. This doesn't, of course,
              drop pressure on the OS provider for making the very best
              thread switch possible.

   Dale Pontius
   (NOT speaking for IBM)

This won't help if the user threads aren't effieciently implemented.
HP-UX has POSIX threads implemented in user space, and they aren't
significantly more lightweight than POSIX threads in the kernel.
Has anyone measured the difference between fibers and threads or
processes in NT?