This is a discussion on Re: SET, CLR, ISSET in types.h for _KERNEL builds - FreeBSD ; On Wed, Jun 28, 2006 at 08:08:24PM +1000, Andrew Reilly wrote: > 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 ...
On Wed, Jun 28, 2006 at 08:08:24PM +1000, Andrew Reilly wrote:
> 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;
> > not
> > 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.
That would require converting our device .h files from defining bit
masks to defining bit numbers. I don't mind you doing that as long
as SET is expanded to:
((variable) |= (1 << (bit)))
-- note the bunch of roughly balanced parentheses ;-)
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