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Date: Wed, 18 Jul 2018 09:41:12 -0700 (PDT)
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Subject: Re: How to run a GNAT program without starting a terminal session
From: Shark8 <onewingedshark@gmail.com>
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Xref: reader02.eternal-september.org comp.lang.ada:53893
Date: 2018-07-18T09:41:12-07:00
List-Id: <comp.lang.ada>

On Wednesday, July 18, 2018 at 1:37:10 AM UTC-6, bj=C3=B6rn lundin wrote:
> On 2018-07-17 23:12, Shark8 wrote:
> > A lot of the cases I've seen where daemons are used/needed are because =
the language [PHP in this case] didn't have any notion of TASKs and DELAYs =
-- rather frustrating to come across when it's so trivially easy in Ada.
>=20
> No, that is not it at all.
> A daemon is a detached background process, like services are on windows.

I never said it wasn't.
What I said was that the lack of TASK and DELAY necessitated the use of dae=
mons in several PHP-based systems I've worked on.

> They have no user interface and are supposed to run a long time.
> webservers, mailservers etc are typically daemons.
So are things that (eg) clean the cache, ensure that some particular proces=
s is still active, and/or start some processing at timed intervals; I've se=
en each of these as a daemon, often as part of a larger system where a TASK=
 and/or TASK/DELAY combo would be appropriate.

> Has absolutely nothing to do whit language/tasks/delays at all
>=20
> <https://en.wikipedia.org/wiki/Daemon_%28computing%29>
Again, look at the above, think in terms of whole system; even if the 'syst=
em' includes manual administration. You're reading what I said backwards: i=
t's not that Daemons are about TASK, it's that daemons are needed because t=
he particular systems I was involved in had no notion of multi-threading an=
d instead stitched together a system emulating it [as some level] via daemo=
ns.