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Re: I want to ask a question...

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On 20/08/15 21:27, James Kuyper wrote:
> On 08/20/2015 01:40 PM, Tonton Th wrote:
>> On 2015-08-20, James Kuyper <jameskuyper@verizon.net> wrote:
>>
>>> Why? It's undefined behavior either way, if the the pointer has an
>>> indeterminate value, and the standard was written that way because there
>>> are real systems on which comparison of a pointer with and indeterminate
>>> value could have nasty consequences.
>>
>>     Can you give us a real (and may be historic) exemple of
>>     some systems where this is the case ?
>
> I remember systems with unusual features mainly for the purpose of
> remembering that those features actually exist, so I tend not to
> remember the corresponding system names, so I can't name it.
> However, I can describe the features the system had that made this a
> problem, and maybe someone will recognize the description. It had a
> virtual memory system, with ranges of address space being associated
> with an arbitrary blocks of physical memory. It kept track of which
> range of addresses was associated with each block of memory currently in
> use, and trapped upon any attempt to use an address (even just in a
> comparison for equality) not currently allocated to any physical block
> of memory. Calling free() could result in a block being removed from the
> list of blocks currently in use.
> It's that last feature that is, apparently, the least common - I've been
> told that most implementations of the malloc() family don't actually
> release memory back to the system until the program exits, which seems
> like rather selfish behavior to me.
>

I believe it is common for malloc implementations to ask the OS for 
large chunks of memory, then dish out parts of that as needed by the 
program.  This way they only bother the OS on occasion, and the overhead 
for malloc is much smaller (there are no context switches or system 
calls for most allocations).  Memory can only be returned to the OS if a 
whole chunk has been freed - and if the program has a mix of malloc's 
and free's, that is rarely going to happen.  It needs a program that has 
allocated a substantial amount of memory, freed it, and then continues 
running for a significant time without re-using that memory space. 
Maybe it is simply not worth the overhead supporting this.

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Re: I want to ask a question... Gareth Owen <gwowen@gmail.com> - 2015-08-07 20:00 +0100
  Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-07 19:04 +0000
  Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-07 15:30 -0700
    Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-07 22:52 +0000
      Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-07 16:46 -0700
        Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-07 23:29 +0000
          Re: I want to ask a question... Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-08-08 01:37 +0100
          Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-07 18:55 -0700
            Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-08 05:51 +0000
              Re: I want to ask a question... Robert Wessel <robertwessel2@yahoo.com> - 2015-08-08 01:44 -0500
    Re: I want to ask a question... Ken Brody <kenbrody@spamcop.net> - 2015-08-10 12:46 -0400
    Re: I want to ask a question... supercat@casperkitty.com - 2015-08-19 16:43 -0700
      Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-19 18:09 -0700
        Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-20 01:00 +0000
          Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-19 20:25 -0700
            Re: I want to ask a question... supercat@casperkitty.com - 2015-08-20 08:15 -0700
              Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-20 11:38 -0700
                Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-20 18:47 +0000
                Re: I want to ask a question... supercat@casperkitty.com - 2015-08-20 14:01 -0700
            Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-20 16:43 +0000
              Re: I want to ask a question... James Kuyper <jameskuyper@verizon.net> - 2015-08-20 13:02 -0400
                Re: I want to ask a question... Tonton Th <tTh@nowhere.invalid> - 2015-08-20 17:40 +0000
                Re: I want to ask a question... James Kuyper <jameskuyper@verizon.net> - 2015-08-20 15:27 -0400
                Re: I want to ask a question... David Brown <david.brown@hesbynett.no> - 2015-08-20 22:58 +0200
                Re: I want to ask a question... James Kuyper <jameskuyper@verizon.net> - 2015-08-20 23:24 -0400
                Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-21 06:19 +0000
                Re: I want to ask a question... Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2015-08-21 09:20 -0600
                Re: I want to ask a question... supercat@casperkitty.com - 2015-08-22 12:25 -0700
                Re: I want to ask a question... Robert Wessel <robertwessel2@yahoo.com> - 2015-08-23 01:33 -0500
                Re: I want to ask a question... glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-08-20 19:28 +0000
              Re: I want to ask a question... Keith Thompson <kst-u@mib.org> - 2015-08-20 12:11 -0700
          Re: I want to ask a question... David Brown <david.brown@hesbynett.no> - 2015-08-20 10:02 +0200
        Re: I want to ask a question... raltbos@xs4all.nl (Richard Bos) - 2015-08-22 13:42 +0000
          Re: I want to ask a question... supercat@casperkitty.com - 2015-08-22 12:23 -0700

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