From: utzoo!watmath!bstempleton
Newsgroups: net.lang.c
Title: Re: C and real hardware
Article-I.D.: watmath.4998
Posted: Sun May  1 22:40:11 1983
Received: Mon May  2 00:11:08 1983
References: n44a.144

Clearly "Unregister" is not the right name for this kind of type.
In general, you are correct in a need for this type.  Not just for
memory-mapped i/o devices, but also for any machine with multiple
processes sharing memory.   Perhaps the atribute "Shared" is good for
in a way you can consider a memory-mapped i/o location to be shared between
the processor and the device.