Re: VC++ 2013, malloc() and free()

From	raltbos@xs4all.nl (Richard Bos)
Newsgroups	comp.lang.c
Subject	Re: VC++ 2013, malloc() and free()
Date	2016-10-27 19:54 +0000
Organization	Go wash your mouth.
Message-ID	<58125aaa.7762265@news.xs4all.nl> (permalink)
References	(3 earlier) <numqlc$92b$1@dont-email.me> <nunqd2$c2l$5@dont-email.me> <b6e17bc9-cb19-4322-8004-53e962259bf6@googlegroups.com> <20161025172315.44bb53a4@maxa-pc.cpe.bvcom.net> <52ae27e2-0157-4f29-8ca8-cbd656f32247@googlegroups.com>

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supercat@casperkitty.com wrote:

> On Tuesday, October 25, 2016 at 10:23:23 AM UTC-5, Melzzzzz wrote:
> > Malloc is not part of the system, usually.
> > If you think about overcommit it is necessary on some setups,
> > especially for GarbageCollector based programs.
> 
> I'm not clear on the advantages of overcommitting storage.

AFAICT the main advantage is that the system can more easily deal with
lazy, unnecessarily greedy programmers, at the price of tempting even
more programmers into even more laziness and unnecessary greed.

> Trying to handle allocation failures when they occur is ugly, but it's at
> least possible to write code to recover from allocation failures somewhat
> gracefully.  If a call to malloc() may yield a pointer to an address that
> could cause a critical failure when code tries to use it, and if there's
> no requirement that applications be able to tell when malloc() might have
> done so, is there any way to write code that uses malloc() storage and is
> guaranteed not to invoke UB?

No. Which, IYAM, makes overcommitting systems blatantly and insultingly
non-conforming.

IMAO, overcommitting storage goes against the Unix philosophy of
trusting the programmer to dig his own grave, but who am I?

Richard

Thread

VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-24 02:20 +0800
  VC++ 2013, malloc() and free() asetofsymbols@gmail.com - 2016-10-23 11:44 -0700
    Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 12:46 +0800
      Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:15 +0200
        Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 07:15 -0700
          Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:18 +0200
            Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 07:32 -0700
              Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:55 +0200
              Re: VC++ 2013, malloc() and free() jameskuyper@verizon.net - 2016-10-25 08:07 -0700
      Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-24 22:30 -0700
        Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:46 +0200
          Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-25 17:54 -0700
            Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-25 17:55 -0700
        Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 22:32 +0800
          Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:46 +0200
            Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:24 +0800
              Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:52 +0800
          Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 08:01 -0700
            Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 17:23 +0200
              Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-25 09:09 -0700
                Re: VC++ 2013, malloc() and free() Keith Thompson <kst-u@mib.org> - 2016-10-25 09:29 -0700
                Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 18:51 +0200
                Re: VC++ 2013, malloc() and free() raltbos@xs4all.nl (Richard Bos) - 2016-10-27 19:54 +0000
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-27 15:06 -0700
                Re: VC++ 2013, malloc() and free() Keith Thompson <kst-u@mib.org> - 2016-10-27 17:06 -0700
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-28 06:47 -0700
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-29 23:16 +0800
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-29 09:35 -0700
                Re: VC++ 2013, malloc() and free() "James R. Kuyper" <jameskuyper@verizon.net> - 2016-10-29 12:51 -0400
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-29 14:26 -0700
                Re: VC++ 2013, malloc() and free() jameskuyper@verizon.net - 2016-10-29 15:27 -0700
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-29 17:11 -0700
          Re: VC++ 2013, malloc() and free() Geoff <geoff@invalid.invalid> - 2016-10-31 13:01 -0700
            Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-10-31 16:35 -0400
              Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-01 15:31 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-01 11:28 -0400
      Re: VC++ 2013, malloc() and free() Geoff <geoff@invalid.invalid> - 2016-10-31 12:11 -0700
        Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-10-31 13:08 -0700
  Re: VC++ 2013, malloc() and free() Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-10-23 21:35 +0100
    Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 12:49 +0800
      Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:16 +0200
        Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 22:30 +0800
  Re: VC++ 2013, malloc() and free() "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-10-23 15:52 -0700
    Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 12:50 +0800
      Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 07:18 +0200
        Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 22:28 +0800
          Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 16:48 +0200
            Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:25 +0800
              Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 17:35 +0200
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-25 23:50 +0800
                Re: VC++ 2013, malloc() and free() Melzzzzz <mel@zzzzz.com> - 2016-10-25 18:45 +0200
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-10-26 01:59 +0800
                Re: VC++ 2013, malloc() and free() Geoff <geoff@invalid.invalid> - 2016-10-31 12:10 -0700
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-01 15:32 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-01 11:31 -0400
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-03 19:28 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-03 10:00 -0400
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-03 23:25 +0800
                Re: VC++ 2013, malloc() and free() Keith Thompson <kst-u@mib.org> - 2016-11-03 09:03 -0700
                [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 02:33 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-03 12:26 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 12:05 +0800
                Re: [OT] luser droog <luser.droog@gmail.com> - 2016-11-03 21:52 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 21:59 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-04 08:45 -0700
                Re: [OT] James Kuyper <jameskuyper@verizon.net> - 2016-11-04 11:49 -0400
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 00:33 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-04 09:56 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 01:40 +0800
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 01:42 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-04 11:52 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 18:13 +0800
                Re: [OT] Keith Thompson <kst-u@mib.org> - 2016-11-05 13:19 -0700
                Re: [OT] "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-06 16:00 +0800
                Re: VC++ 2013, malloc() and free() Jerry Stuckle <jstucklex@attglobal.net> - 2016-11-03 20:16 -0400
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-05 00:34 +0800
                Re: VC++ 2013, malloc() and free() supercat@casperkitty.com - 2016-11-03 08:54 -0700
                Re: VC++ 2013, malloc() and free() "Mr. Man-wai Chang" <toylet.toylet@gmail.com> - 2016-11-04 02:31 +0800

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