Re: library confusion, Windows, was Arm to run within IBM z

From	cross@spitfire.i.gajendra.net (Dan Cross)
Newsgroups	comp.arch
Subject	Re: library confusion, Windows, was Arm to run within IBM z
Date	2026-04-13 11:27 +0000
Organization	PANIX Public Access Internet and UNIX, NYC
Message-ID	<10rijvo$57h$1@reader1.panix.com> (permalink)
References	<20260404213401.0000593a@yahoo.com> <10rdo84$e4s$1@gal.iecc.com> <10rgul4$lao$1@reader1.panix.com> <10rhobd$19hs$1@gal.iecc.com>

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In article <10rhobd$19hs$1@gal.iecc.com>, John Levine  <johnl@taugh.com> wrote:
>According to Dan Cross <cross@spitfire.i.gajendra.net>:
>>It may not even affect the external API.  Consider a library
>>that can, optionally, be compiled to take advantage of multiple
>>threads of execution internally.  Software that expects to use
>>that may have to take additional care to avoid conflicts between
>>threads (e.g., perhaps the library takes a reference to a
>>callback function that can be invoked by one of these threads;
>>now, the callback has to be carefully written to accommodate
>>the possibility of concurrent callback invocation, whereas in
>>the single-threaded version, it does not).  In this case, I
>>would argue that the API is the same, though I could see an
>>argument that it is not.
>
>That still sounds like "don't do that."

It does.  And yet, in the real world, that sort of thing has
been a factor in production outages.  One can but shake one's
head in disbelief at the folly of one's fellows.

>If the library might
>be multithreaded, the calling program needs to deal with that.
>A broken program that sometimes works due to luck is still broken.

There was a messy period of time when threading was not quiet
ubiqutious yet, but not particularly stable, either.  A lot of
programs that had been written assuming a single-threaded
environment went through a painful period of adjustment as the
ecosystem overall went to multithreading.  Or, putting it
another way, those programs were written when they could assume
that their dependencies weren't playing fast and loose with
threads under the scenes (or at least not in a way that they
could observe), and at some point during the lifecycles of those
programs, that all changed.

>This all seems pretty hypothetical, though.  Yes, there are plenty
>of packages that can be compiled with different flavors of dbm but
>I don't ever recall seeing one that then exported a library to
>be used by other applications.  I mostly work on FreeBSD so I
>could believe that linux packages are sloppier.

It is admittedly hypothetical, though I have actually had the
DB thing be an issue; probably due to some assumption in a shell
script a sysadmin had written or something.

	- Dan C.

Thread

Arm to run within IBM z Michael S <already5chosen@yahoo.com> - 2026-04-04 21:34 +0300
  Re: Arm to run within IBM z quadi <quadibloc@ca.invalid> - 2026-04-04 20:39 +0000
    Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-04 22:08 +0000
      Re: Arm to run within IBM z quadi <quadibloc@ca.invalid> - 2026-04-04 23:32 +0000
        Re: Arm to run within IBM z David Schultz <david.schultz@earthlink.net> - 2026-04-04 20:12 -0500
          Re: Arm to run within IBM z George Neuner <gneuner2@comcast.net> - 2026-04-05 00:14 -0400
            Re: Arm to run within IBM z David Schultz <david.schultz@earthlink.net> - 2026-04-05 06:12 -0500
              Re: Arm to run within IBM z George Neuner <gneuner2@comcast.net> - 2026-04-06 13:09 -0400
          Re: Arm to run within IBM z anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2026-04-05 09:56 +0000
            Re: Arm to run within IBM z David Schultz <david.schultz@earthlink.net> - 2026-04-05 06:17 -0500
          Re: Arm to run within IBM z antispam@fricas.org (Waldek Hebisch) - 2026-04-05 16:09 +0000
  Re: Arm to run within IBM z antispam@fricas.org (Waldek Hebisch) - 2026-04-05 02:35 +0000
    Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-05 02:56 +0000
      Re: Arm to run within IBM z Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-04-04 21:11 -0700
        Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-05 04:34 +0000
          Re: Arm to run within IBM z Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-04-04 22:04 -0700
            Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-06 00:30 +0000
          Re: Arm to run within IBM z Michael S <already5chosen@yahoo.com> - 2026-04-05 12:51 +0300
          Re: Arm to run within IBM z scott@slp53.sl.home (Scott Lurndal) - 2026-04-05 15:04 +0000
      Re: Arm to run within IBM z antispam@fricas.org (Waldek Hebisch) - 2026-04-05 16:16 +0000
        Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-06 00:31 +0000
        Re: Arm to run within IBM z quadi <quadibloc@ca.invalid> - 2026-04-06 03:57 +0000
          Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-06 07:04 +0000
            Re: Arm to run within IBM z MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-04-06 16:35 +0000
              Re: Arm to run within IBM z scott@slp53.sl.home (Scott Lurndal) - 2026-04-06 16:48 +0000
                Re: Arm to run within IBM z MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-04-06 22:32 +0000
              Re: Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-06 18:41 +0000
                Re: Arm to run within IBM z MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-04-06 22:33 +0000
                Re: Arm to run within IBM z Michael S <already5chosen@yahoo.com> - 2026-04-07 02:31 +0300
                Re: Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-07 14:41 +0000
              Re: Arm to run within IBM z quadi <quadibloc@ca.invalid> - 2026-04-07 02:16 +0000
                Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-07 04:55 +0000
                Re: Arm to run within IBM z Thomas Koenig <tkoenig@netcologne.de> - 2026-04-07 05:44 +0000
                Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-07 07:53 +0000
                Re: Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-07 14:44 +0000
                Re: Windows, was Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-07 19:39 +0000
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-08 11:39 +0000
                Re: Windows, was Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-08 19:25 +0000
                Re: Windows, was Arm to run within IBM z David Schultz <david.schultz@earthlink.net> - 2026-04-08 15:48 -0500
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-08 20:54 +0000
                Re: Windows, was Arm to run within IBM z Michael S <already5chosen@yahoo.com> - 2026-04-09 00:07 +0300
                Re: Windows, was Arm to run within IBM z George Neuner <gneuner2@comcast.net> - 2026-04-09 17:51 -0400
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-10 11:47 +0000
                Re: Windows, was Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-11 15:09 +0000
                Re: Windows, was Arm to run within IBM z MitchAlsup <user5857@newsgrouper.org.invalid> - 2026-04-11 17:53 +0000
                Re: Windows, was Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-11 19:20 +0000
                Re: Windows, was Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-11 21:37 +0000
                Re: Windows, was Arm to run within IBM z "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-11 14:49 -0700
                Re: Windows, was Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-11 23:37 +0000
                Re: Windows, was Arm to run within IBM z George Neuner <gneuner2@comcast.net> - 2026-04-12 23:03 -0400
                Re: Windows, was Arm to run within IBM z "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-15 12:55 -0700
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-12 20:22 +0000
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-12 20:17 +0000
                Re: library confusion, Windows, was Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-13 03:36 +0000
                Re: library confusion, Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-13 11:27 +0000
                Re: Windows, was Arm to run within IBM z jgd@cix.co.uk (John Dallman) - 2026-04-15 12:22 +0100
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-15 13:51 +0000
                Re: Windows, was Arm to run within IBM z scott@slp53.sl.home (Scott Lurndal) - 2026-04-15 14:43 +0000
                Re: libraries, Windows, was Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-16 01:24 +0000
                Re: Windows, was Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-16 00:49 +0000
                Re: Windows, was Arm to run within IBM z Paul Clayton <paaronclayton@gmail.com> - 2026-04-18 22:35 -0400
                Re: Windows, was Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-19 03:04 +0000
                Re: Windows, was Arm to run within IBM z George Neuner <gneuner2@comcast.net> - 2026-04-19 00:34 -0400
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-19 06:03 +0000
                Re: Windows, was Arm to run within IBM z Andy Valencia <vandys@vsta.org> - 2026-04-13 09:21 -0700
                Re: Windows, was Arm to run within IBM z Thomas Koenig <tkoenig@netcologne.de> - 2026-04-13 17:21 +0000
                Re: Windows, was Arm to run within IBM z legalize+jeeves@mail.xmission.com (Richard) - 2026-04-13 18:55 +0000
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-13 20:15 +0000
                Re: Windows, was Arm to run within IBM z Thomas Koenig <tkoenig@netcologne.de> - 2026-04-13 20:20 +0000
                Re: Windows, was Arm to run within IBM z legalize+jeeves@mail.xmission.com (Richard) - 2026-04-14 04:51 +0000
                Re: Windows, was Arm to run within IBM z Thomas Koenig <tkoenig@netcologne.de> - 2026-04-14 05:54 +0000
                Re: Windows, was Arm to run within IBM z legalize+jeeves@mail.xmission.com (Richard) - 2026-04-14 16:23 +0000
                Re: Windows, was Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-13 19:56 +0000
                Re: Windows, was Arm to run within IBM z jgd@cix.co.uk (John Dallman) - 2026-04-15 12:22 +0100
                Re: Windows, was Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-15 13:53 +0000
                Re: Windows, was Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-15 22:28 +0000
                Re: Windows, was Arm to run within IBM z Thomas Koenig <tkoenig@netcologne.de> - 2026-04-08 19:48 +0000
                Re: Windows, was Arm to run within IBM z Stefan Monnier <monnier@iro.umontreal.ca> - 2026-04-09 09:49 -0400
              Re: Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-07 19:35 +0000
    Re: Arm to run within IBM z Stephen Fuld <sfuld@alumni.cmu.edu.invalid> - 2026-04-04 20:56 -0700
      Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-05 04:36 +0000
        Re: Arm to run within IBM z Michael S <already5chosen@yahoo.com> - 2026-04-05 13:41 +0300
      Re: Arm to run within IBM z antispam@fricas.org (Waldek Hebisch) - 2026-04-05 17:04 +0000
        Re: Arm to run within IBM z quadi <quadibloc@ca.invalid> - 2026-04-06 04:04 +0000
          Re: Arm to run within IBM z Michael S <already5chosen@yahoo.com> - 2026-04-06 12:29 +0300
    Re: Arm to run within IBM z quadi <quadibloc@ca.invalid> - 2026-04-05 05:24 +0000
      Re: Arm to run within IBM z John Levine <johnl@taugh.com> - 2026-04-05 19:14 +0000
  Re: Arm to run within IBM z jgd@cix.co.uk (John Dallman) - 2026-04-05 12:43 +0100
    Re: Arm to run within IBM z scott@slp53.sl.home (Scott Lurndal) - 2026-04-05 15:12 +0000
      Re: Arm to run within IBM z cross@spitfire.i.gajendra.net (Dan Cross) - 2026-04-06 12:21 +0000
        Re: Arm to run within IBM z scott@slp53.sl.home (Scott Lurndal) - 2026-04-06 16:46 +0000
        Re: Arm to run within IBM z "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-09 02:27 -0700
          Re: Arm to run within IBM z scott@slp53.sl.home (Scott Lurndal) - 2026-04-09 14:49 +0000
    Re: Arm to run within IBM z Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-04-06 00:35 +0000
  Re: Arm to run within IBM z "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2026-04-08 18:41 -0700

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