This is a discussion on Re: SET, CLR, ISSET in types.h for _KERNEL builds - FreeBSD ; On Wed, Jun 28, 2006 at 09:53:46AM +0000, Poul-Henning Kamp wrote: > In message , Yar Tikhiy writes: > >On Tue, Jun 27, 2006 at 01:58:17PM -0600, M. Warner Losh wrote: > > >> NetBSD recently added SET, CLR, ISSET ...
On Wed, Jun 28, 2006 at 09:53:46AM +0000, Poul-Henning Kamp wrote:
> In message <20060628094221.GA50978@comp.chem.msu.su>, Yar Tikhiy writes:
> >On Tue, Jun 27, 2006 at 01:58:17PM -0600, M. Warner Losh wrote:
> >> NetBSD recently added SET, CLR, ISSET to sys/types.h (only if _KERNEL
> >> is defined).
> As one of the people who have worked with the original /bin/sh source
> code, I have a slight alergic reaction to attempts to paste over
> the implementation language with macros like these.
> Setting a bit in 'C' is spelled
> variable |= bit;
> SET(variable, bit);
To my eye, if you're going to use "bit" to describe which bit is
being operated on, then you should *really* be doing:
variable |= (1 << bit)
and, obviously, SET(variable, bit) should do that, rather than
what has been proposed.
What you're spelling, above, and what the NetBSD macros that
Warner described do are actually doing:
Compatability is a good thing, and if it's convenient to have
NetBSD compatability macros, then go do it, but I think that
it's important that they advertise what they're doing correctly.
(Like the colour now?)
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