From: Lawrence Stewart <stewart@serissa.com>
To: Clem Cole <clemc@ccc.com>
Cc: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] non-blocking IO
Date: Tue, 2 Jun 2020 17:15:21 -0400 [thread overview]
Message-ID: <515ABF82-79D4-4DB8-90F1-4DDD512C7706@serissa.com> (raw)
In-Reply-To: <CAC20D2NT-KGP6hb0Zsd2uNpMJjRDxp3EKU2xC2WJW1U8Npawjw@mail.gmail.com>
I remember working on getting Arpanet access on an 11/34 running V7 around 1978 or 1979. (SU-ISL). We used an 11/23 as a front end to run NCP, using a variation of Rand’s code. I wrote some sort of bisync driver for packet communications between the /23 and the /34, and I think added an IOCTL or some hack to ask if there was a message ready. So a polling variety of non-blocking I/O :)
Meanwhile, on the Alto, surely an underpowered machine, the style for UI programming and asynch I/O was mostly event driven, much like libevent in more recent years. I found that very easy to understand.
The main trajectory of PARC was lightweight threads calling synchronous I/O which really has to be counted as a Bad Idea not yet fully stamped out.
I’ve always thought select(2) was a pretty good thing. In 1995 at Open Market we had a single-process web server that had no difficulties running 1000 to 1200 connections. I think that was BSD, and later OSF-1.
-L
next prev parent reply other threads:[~2020-06-02 21:21 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-02 14:19 Paul Ruizendaal
2020-06-02 17:45 ` Paul Winalski
2020-06-02 17:59 ` arnold
2020-06-02 18:53 ` Paul Winalski
2020-06-02 19:18 ` Clem Cole
2020-06-02 21:15 ` Lawrence Stewart [this message]
2020-06-02 22:03 ` [TUHS] non-blocking IO - threads Jon Steinhart
2020-06-02 23:05 ` Rob Pike
2020-06-02 23:09 ` Rob Pike
2020-06-02 23:21 ` Larry McVoy
2020-06-03 0:39 ` Rob Pike
2020-06-02 23:12 ` Jon Steinhart
2020-06-03 16:42 ` Paul Winalski
2020-06-03 17:57 ` Jon Forrest
2020-06-03 5:38 ` [TUHS] Unix on the Arpanet Lars Brinkhoff
2020-06-03 12:23 ` Lawrence Stewart
2020-06-02 18:23 ` [TUHS] non-blocking IO Dan Cross
2020-06-02 18:56 ` Paul Winalski
2020-06-02 19:23 ` Clem Cole
-- strict thread matches above, loose matches on Subject: below --
2020-06-06 13:29 Noel Chiappa
2020-06-02 20:13 Noel Chiappa
2020-06-02 20:43 ` Clem Cole
2020-06-02 22:14 ` Rich Morin
2020-06-03 16:31 ` Paul Winalski
2020-06-03 19:19 ` John P. Linderman
2020-06-02 8:22 Paul Ruizendaal
2020-06-02 0:08 Noel Chiappa
2020-06-01 23:17 Noel Chiappa
2020-05-31 11:09 Paul Ruizendaal
2020-05-31 16:05 ` Clem Cole
2020-05-31 16:46 ` Warner Losh
2020-05-31 22:01 ` Rob Pike
2020-06-01 3:32 ` Dave Horsfall
2020-06-01 14:58 ` Larry McVoy
2020-06-04 9:04 ` Peter Jeremy
2020-06-04 14:19 ` Warner Losh
2020-06-04 16:34 ` Tony Finch
2020-06-04 16:50 ` Larry McVoy
2020-06-05 16:00 ` Dan Cross
2020-06-12 8:18 ` Dave Horsfall
2020-06-01 16:58 ` Heinz Lycklama
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