Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!uwvax!natasha.cs.wisc.EDU!zvr
From: zvr@natasha.cs.wisc.EDU (Alexios Zavras)
Newsgroups: comp.unix.ultrix
Subject: Re: looking for usleep() implementation for ULTRIX
Message-ID: <8904@spool.cs.wisc.edu>
Date: 19 Oct 89 17:53:10 GMT
References: <8896@spool.cs.wisc.edu> <5508@shlump.nac.dec.com> <5499@shlump.nac.dec.com>
Sender: news@spool.cs.wisc.edu
Reply-To: zvr@natasha.cs.wisc.EDU (Alexios Zavras)
Organization: University of Wisconsin - Computer Sciences Department
Lines: 38

In article <8896@spool.cs.wisc.edu>, I wrote:
> #define macro(x)	do { stmt1(x); stmt2(x); ... } while (0);

and later...

> #define usleep(usec)
>         do                                                              \
>         {                                                                \
>             struct timeval  usl_delay;                                    \
>             usl_delay.tv_sec  = (int) (usec) / 1000000;                    \
>             usl_delay.tv_usec = (int) (usec) % 1000000;                     \
>             (void) select(0,(fd_set *)0,(fd_set *)0,(fd_set *)0,
&usl_delay);\
>         } while (0);

Sorry, I must have been asleep! :-)

You naturally have to omit the final `;' in both cases, i.e.:

#define macro(x)	do { stmt1(x); stmt2(x); ... } while (0)

Then you can easily write 
	if (...)
		macro(...);
	else
		...

without any problems...

Sorry about that,
-- zvr --
	+-----------------------+	Alexios Zavras
	| Life is once, forever |	zvr@cs.wisc.edu
	+-----------------H C-B-+	zavras@cs.wisc.edu
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