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Newsgroups: comp.lang.ada
Date: Wed, 21 Mar 2018 15:16:15 -0700 (PDT)
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Subject: Re: Ada-Oriented GUI
From: "Dan'l Miller" <optikos@verizon.net>
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Xref: reader02.eternal-september.org comp.lang.ada:51113
Date: 2018-03-21T15:16:15-07:00
List-Id: <comp.lang.ada>

Dmitry wrote:=20
> This is not how asynchronous I/O works in
> many cases. The I/O request is=20
> queued in one thread, initiated in another,
> processed in third, completed in fourth.

(Other than message-queue-based software architectures,) please name even o=
ne async =E2=80=A2=E2=80=A2system call=E2=80=A2=E2=80=A2 on any OS or OS-fr=
amework thereof that requires traversal of those 4 =E2=80=A2=E2=80=A2app-do=
main=E2=80=A2=E2=80=A2 threads to produce results (e.g., filesystem read) a=
synchronously.  I=E2=80=99ll bet that you cannot name even one actually ext=
ant async system call in any OS in the past 50 years to requires such a con=
voluted 4 (!) app-domain thread opportunity for reordering via differently-=
interleaved queuing at each/any of those 4 threads.

What you describe can be a hallmark of message-queue-based software archite=
ctures, message-queue software architectures are synonymous with async I/O.