Date: Wed, 10 Aug 2011 15:20:01 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Alexander Best <arundel@freebsd.org> Cc: svn-src-head@FreeBSD.org, svn-src-all@FreeBSD.org, src-committers@FreeBSD.org, Jonathan Anderson <jonathan@FreeBSD.org>, Bruce Evans <brde@optusnet.com.au> Subject: Re: svn commit: r224721 - head/sys/sys Message-ID: <4E428581.4050803@FreeBSD.org> In-Reply-To: <20110810103831.GA60858@freebsd.org> References: <201108082036.p78KarlR062810@svn.freebsd.org> <20110809105824.P896@besplex.bde.org> <20110810103831.GA60858@freebsd.org>
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On 2011-08-10 12:38, Alexander Best wrote:
...
> any reason {TIMEVAL,TIMESPEC}_TO_{TIMESPEC,TIMEVAL}()s code is being executed
> in a
>
> do { ... } while (0)
>
> conditional loop? both macros are also defined in crypto/openssh/defines.h and
> don't seem to need that extra one-time-loop.
It's a very common C idiom. See:
http://stackoverflow.com/questions/154136/why-are-there-sometimes-meaningless-do-while-and-if-else-statements-in-c-c-macr
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