[unios] draft doc

[Pieter Dumon]

From: Pieter Dumon <Pieter.Dumon@rug.ac.be>

Some comments on Pat's draft model:

 - Where would you locate the objects that 
   schedule memory and cpu time ? Running on top of the 
   hardware abstracts or running _as_ a hardware abstract?
   The former will be slower, but it will be more flexible.
   Windows NT designers first thought about putting the schedulers
   (memory & cpu) in the executive (together with the object manager,
   I/O manager, security manager etc), but they found out it was too 
   slow, because every manager in the executive uses a seperate memory
   space (and this is also the case for your high-level abstracts),
   so they decided to use a microkernel instead on top of their HAL and
   run the executive on top of that.
 
 - How can the FS load files if there are no drivers (low-level
   abstracts) yet?
 
 - Installing the system for single- or multi-user mode isn't very
   flexible. We must be able to switch between many configurations at  
   run-time. e.g., in Unix multiple runlevels are defined, one runlevel
   is for shutdown, one for reboot, one for single-user mode, one for 
   multi-user mode, one for multi-user mode with network etc... You can
   change these runlevels as you want, adding or removing services from
   them (eg. logging) , and you can specify which kind of users can log in 
   into the system when the system is in a certain runlevel. The root can 
   switch runlevels at run-time with the 'init <runlevel>' command. 
   
   Just to give an example :-)
   It should be made even more flexible than Unix...
 
Pieter

----------------------------------------
 Pieter.Dumon@rug.ac.be               
                                      
 http://studwww.rug.ac.be/~pdumon     
 
 ICQ  : 12428974
---------------------------------------

------------------------------------------------------------------------
At last! The perfect gifts for baseball fans...or anyone. Merchandise from
the Sonoma County Crushers, champions of the Western Baseball League (USA).
Go to http://www.icatmall.com/crushers
------------------------------------------------------------------------
UniOS Group
http://members.xoom.com/unios