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X-Authentication-Warning:	slinky.cs.nyu.edu: pechtcha owned process doing -bs
Date:	Tue, 14 Oct 2003 14:04:39 -0400 (EDT)
From:	Igor Pechtchanski <pechtcha AT cs DOT nyu DOT edu>
Reply-To:	cygwin AT cygwin DOT com
To:	Alex Vinokur <alexvn AT connect DOT to>
cc:	cygwin AT cygwin DOT com
Subject:	Re: clock_t & return -1
In-Reply-To:	<bmhbv6$fu1$1@sea.gmane.org>
Message-ID:	<Pine.GSO.4.56.0310141356340.20462@slinky.cs.nyu.edu>
References:	<bmhbv6$fu1$1 AT sea DOT gmane DOT org>
Importance:	Normal
MIME-Version:	1.0

On Tue, 14 Oct 2003, Alex Vinokur wrote:

> # ------ man clock (fragments) ------
> # RETURNS
> #        The amount of processor time used so far by your program, in units
> #        defined by the machine-dependent macro `CLOCKS_PER_SEC'.
> #        If no measurement is available, the result is `-1'.
>
> So, clock() is unsigned and never returns -1 (?!)
>
> If one must write
>   ----------------------------------
>   if (!(clock () == (clock_t)(-1)));
>   ----------------------------------
>   I think it is worth noting that in the manual.

The above is always good practice anyway.  Besides, it seems they do it
this way in a few other places as well:

<http://www.hmug.org/man/3/clock.html>
<http://www.rocketaware.com/man/man3/clock.3.htm>
<http://developer.apple.com/documentation/Darwin/Reference/ManPages/html/clock.3.html>
<http://www-sbras.nsc.ru/cgi-bin/www/unix_help/unix-man?clock+3>
<http://pluto.iis.nsk.su/cgi-bin/man-cgi?clock+3>

IOW, this is not Cygwin specific.  FWIW, you're welcome to submit a patch
to the cygwin-doc package.
	Igor
-- 
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