🚀 go-pugleaf

jdege@winternet.com (Jeff Dege) wrote:
>
> On 18 Aug 1995 16:29:55 GMT, Maynard Handley (maynardh@apple.com) wrote:
> : So let me get this straight. You feel that an Protected Memory and 
> : Pre-emptive Multitasking are ESSENTIAL OS features. Yet you feel that a 
> : dynamic linking mechanism (call it DLLs, CFM, Component Mananger, 
> : whatever) is optional. Strange how your view of what's essential in an OS 
> : corresponds closely to the one OS with which you are familiar.
> 
>    All dynamic linking does is save you disk space.  I hardly consider it
> an essential proporty of an OS.

Most modern dynamic linking schemes are accomplished in the
linked in startup code (crt0.o).   This requires the OS service
of mapping a file into the process address space.

For non-virtual page mappings, the older scheme of mapping the
libraries at fixed locations in everyones address space (ala the
AT&T UNIX PC -- which had PM, "DLL"'s, and bitmapped graphics)
requires the OS to do the work as part of the exec loader.


                                        Terry Lambert
                                        terry@cs.weber.edu
---
Any opinions in this posting are my own and not those of my present
or previous employers.