From: "Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org>
Subject: Re: A question about task's select delay alternative
Date: Mon, 23 Apr 2018 20:06:26 +0200
Date: 2018-04-23T20:06:26+02:00 [thread overview]
Message-ID: <pbl7b3$3o4$1@dont-email.me> (raw)
In-Reply-To: <f425a473-eee5-4ac4-8f0b-2413af36f508@googlegroups.com>
On 04/23/2018 07:32 PM, NiGHTS wrote:
>
> What does "delay" actually do to the CPU? In this case I am using the Adacore GNAT compiler for a PC. Is it a loop constantly evaluating elapsed time? Or is it some kind of timed interrupt?
What timed selective accept "does to the CPU" is not defined by the language.
It's determined by the compiler implementation and, probably, by the features of
the OS, if any. So there's no Ada answer to your question.
I don't know how GNAT implements this, but my experience with it is that blocked
tasks don't use significant CPU. You can test this easily enough.
Why do you care?
--
Jeff Carter
"When danger reared its ugly head, he bravely
turned his tail and fled."
Monty Python and the Holy Grail
60
next prev parent reply other threads:[~2018-04-23 18:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-23 17:32 A question about task's select delay alternative NiGHTS
2018-04-23 18:06 ` Jeffrey R. Carter [this message]
2018-04-23 18:25 ` NiGHTS
2018-04-24 20:04 ` reinert
2018-04-23 20:40 ` Dmitry A. Kazakov
2018-04-23 21:10 ` NiGHTS
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