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From: torek@elf.ee.lbl.gov (Chris Torek)
Newsgroups: comp.unix.wizards
Subject: Re: usleep by poll()
Message-ID: <11691@dog.ee.lbl.gov>
Date: 2 Apr 91 19:00:37 GMT
References: <2171@estevax.UUCP> <126500@uunet.UU.NET> <6925@auspex.auspex.com> <999@muffin.cme.nist.gov>
Reply-To: torek@elf.ee.lbl.gov (Chris Torek)
Organization: Lawrence Berkeley Laboratory, Berkeley
Lines: 14
X-Local-Date: Tue, 2 Apr 91 11:00:37 PST

In article <999@muffin.cme.nist.gov> libes@cme.nist.gov (Don Libes)
[posts real code.  Commendable.  Now for a tangent :-) ]
>[System V's] poll() is defined in terms of milliseconds.

Good grief---first Bill Joy (most likely candidate at least) makes the
mistake of defining `timeval' structures as seconds+microseconds, then
System V compounds it by going the *wrong direction*!

Time values, including delays, should be in nanosecond granularity,
if not finer.  (Nanoseconds has the advantage of fitting easily in 64
bits as divided into `struct timevalue { long tv_sec; long tv_nsec; };'.)
-- 
In-Real-Life: Chris Torek, Lawrence Berkeley Lab CSE/EE (+1 415 486 5427)
Berkeley, CA		Domain:	torek@ee.lbl.gov