Date: Wed, 13 Mar 1996 10:27:08 +1030 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: luigi@labinfo.iet.unipi.it (Luigi Rizzo) Cc: leisner@sdsp.mc.xerox.com, msmith@atrad.adelaide.edu.au, questions@freebsd.org Subject: Re: non-blocking read ? Message-ID: <199603122357.KAA00112@genesis.atrad.adelaide.edu.au> In-Reply-To: <199603121806.TAA20924@labinfo.iet.unipi.it> from "Luigi Rizzo" at Mar 12, 96 07:06:55 pm
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Luigi Rizzo stands accused of saying: > > Someone suggested doing async IO and handling SIGIO (I suppose this > refers to doing See my previous message regarding not being sure about this, and definitely check how harvest does it, I'm sure I was wrong earlier 8( > But how much data will be available when I get the SIGIO (or select > will return that I/O is possible) ? The amount I requested (assuming it > is available), or the system idea of a block, or what ? "some"; you call read and examine the return value to see how much you get. Thinking about it further, I don't see how this would work for disk I/O; it's not until the read itself is issued that the disk request is queued ... > Luigi Rizzo Dip. di Ingegneria dell'Informazione -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
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