Re: Thread implementations...

Gerard Roudier (groudier@club-internet.fr)
Tue, 23 Jun 1998 19:09:42 +0200 (MET DST)


Hi Richard,

My posts were not against you and your proposal. It is my opinion about
the thread-mania that comes from some O/Ses I consider as very bad.
Thanks to god, I have had to work on some good O/Ses.
About I/O completion, for example, I do like how TANDEM/GUARDIAN handles
this.

If I remember correctly, this works as follow:

- User program associates a TAG to each request.
- When user program wants to wait for completion it calls the
AWAITIO() system service.
- On return, the O/S indicates the TAG corresponding to the request that
is complete.
- Etc ...

I think that the VMS semantic for I/O completion is a lot too complex
to implement on UNIX systems, but the GUARDIAN semantic that is as
efficient, IMO, could be implemented without conflicting too much with
UNIX semantic.

I will look into your io-event proposal, and will tell you my opinion about.

Regards,
Gerard.

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