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From: Michael Banck <[email protected]>
To: Thomas Munro <[email protected]>
Cc: Alexander Lakhin <[email protected]>
Cc: Tom Lane <[email protected]>
Cc: Michael Paquier <[email protected]>
Cc: Samuel Thibault <[email protected]>
Cc: [email protected]
Subject: Re: GNU/Hurd portability patches
Date: Mon, 17 Nov 2025 10:39:56 +0100
Message-ID: <[email protected];lightning.p46.dedyn.io> (raw)
In-Reply-To: <CA+hUKGKAUa7ybQ9=6ap2uh-TmHtH8wFL-DTeeh-swprg+Rf=+w@mail.gmail.com>
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Hi Thomas,

On Mon, Nov 17, 2025 at 03:59:30PM +1300, Thomas Munro wrote:
> On Tue, Nov 11, 2025 at 10:49 AM Michael Banck <[email protected]> wrote:
> > |login: task ./test_signalhandler(767) looked up a bogus port 23 for3205, most probably a bug.
> 
> . o O { An absurdly far-fetched thought while browsing glibc/hurd glue
> code: if synchronous I/O is implemented as RPC on Mach ports, could
> that mean that it's technically possible to submit now and consume
> results later, for asynchronous I/O?   Possibly too
> private/undocumented anyway, and maybe they'll eventually do io_uring
> or something...  I idly wondered about driving I/O directly with ports
> while studying the dismal implementation of POSIX AIO on macOS, which
> also derives from CMU Mach, but NeXT/Apple jammed file systems down
> into the unikernel part behind traditional syscalls, and it looks like
> maybe only raw devices are accessible with ports.  (I have dim
> memories of learning C and assembler more than 30 years ago on a
> Commodore Amiga whose microkernel nee Cambridge TRIPOS worked like
> that... that cheap home computer could easily get both floppy drives
> doing random I/O at once while computing other stuff, unlike Unix...)
> }

I have CC'd Samuel Thibault who is the currently active Hurd committer/
maintainer, I hope he can comment on that.


Michael





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