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Groups > comp.lang.c > #43773

Re: cpy functions

From Kaz Kylheku <kaz@kylheku.com>
Newsgroups comp.lang.c
Subject Re: cpy functions
Date 2014-04-28 23:19 +0000
Organization Aioe.org NNTP Server
Message-ID <20140428155656.233@kylheku.com> (permalink)
References <ljmdfj$su4$1@dont-email.me> <lneh0hp2xb.fsf@nuthaus.mib.org> <ljmi39$uj0$1@dont-email.me> <bvmtl95nipkbad47hu26jfhil7dkkaj8eg@4ax.com>

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On 2014-04-28, Barry Schwarz <schwarzb@dqel.com> wrote:
> On Mon, 28 Apr 2014 17:44:14 -0400, "Bill Cunningham"
><nospam@nspam.invalid> wrote:
>
><snip quoted text from a different author>
>
>>    With memcpy, I think it would be the job of the kernel to make sure the 
>>memory areas don't overlap. That's what memory management services are for.
>
> Where in the description of memcpy that you have not read do you see
> any reference to a kernel?

That's just another coded Cunniham sentence which says "I don't actually have a
spectacular learning disability".

It's silly, but in a way that can only be intelligently contrived, with just
the right dash of plausibility.

You just have to pay attention and "read between the lines".

> Which kernel service do you think memcpy
> needs to invoke?  Why do you think memcpy has anything to do with
> memory management?

It's not as crazy as you might think. Typically when we have an API
wich manages, say, "widgets", it lets us create widgets, destroy them,
copy one to another and so on. It's all part of the "management of widgets".

Okay, so, copying of memory is part of the management of memory; memcpy is an
API operation on memory! Get it? malloc creates it, memcpy copies it, etc.

The main point of importance here is that a genuine moron wouldn't make this
up.

Which kernel service might memcpy invoke? One which gives the program the
benefit of, say, a DMA-capable bus master to do the copy, if that is
advantageous for the given parameters.

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Thread

cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 16:25 -0400
  Re: cpy functions John Gordon <gordon@panix.com> - 2014-04-28 20:42 +0000
    Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 16:54 -0400
      Re: cpy functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-04-28 22:22 +0100
        Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 17:26 -0400
      Re: cpy functions Richard <rgrdev_@gmail.com> - 2014-04-29 00:19 +0200
  Re: cpy functions Andrew Smallshaw <andrews@sdf.lonestar.org> - 2014-04-28 20:44 +0000
    Re: cpy functions Keith Thompson <kst-u@mib.org> - 2014-04-28 14:44 -0700
  Re: cpy functions Geoff <geoff@invalid.invalid> - 2014-04-28 13:55 -0700
    Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 17:07 -0400
      Re: cpy functions Geoff <geoff@invalid.invalid> - 2014-04-28 14:13 -0700
        Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 17:22 -0400
          Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 17:32 -0400
          Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 18:17 -0400
            Re: cpy functions jacob navia <jacob@spamsink.net> - 2014-04-29 00:43 +0200
              Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 19:31 -0400
                Re: cpy functions Ian Collins <ian-news@hotmail.com> - 2014-04-29 11:33 +1200
            Re: cpy functions Richard <rgrdev_@gmail.com> - 2014-04-29 02:27 +0200
          Re: cpy functions Barry Schwarz <schwarzb@dqel.com> - 2014-04-28 15:53 -0700
            Re: cpy functions "Bill Cunningham" <nosapm@nspam.invalid> - 2014-04-29 17:27 -0400
        Re: cpy functions Kaz Kylheku <kaz@kylheku.com> - 2014-04-28 21:55 +0000
          Re: cpy functions jacob navia <jacob@spamsink.net> - 2014-04-29 00:40 +0200
        Re: cpy functions Richard <rgrdev_@gmail.com> - 2014-04-29 00:20 +0200
      Re: cpy functions Ike Naar <ike@iceland.freeshell.org> - 2014-04-28 21:48 +0000
      Re: cpy functions Richard <rgrdev_@gmail.com> - 2014-04-29 00:20 +0200
      Re: cpy functions Barry Schwarz <schwarzb@dqel.com> - 2014-04-28 15:49 -0700
        Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 19:33 -0400
    Re: cpy functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-04-28 22:13 +0100
  Re: cpy functions Keith Thompson <kst-u@mib.org> - 2014-04-28 14:19 -0700
    Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 17:34 -0400
    Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 17:44 -0400
      Re: cpy functions Barry Schwarz <schwarzb@dqel.com> - 2014-04-28 15:55 -0700
        Re: cpy functions Kaz Kylheku <kaz@kylheku.com> - 2014-04-28 23:19 +0000
          Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 19:24 -0400
            Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 19:26 -0400
              Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 20:07 -0400
          Re: cpy functions "Bill Cunningham" <nosapm@nspam.invalid> - 2014-04-29 17:30 -0400
  Re: cpy functions Barry Schwarz <schwarzb@dqel.com> - 2014-04-28 15:43 -0700
    Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 19:17 -0400
      Re: cpy functions "Bill Cunningham" <nospam@nspam.invalid> - 2014-04-28 19:35 -0400
  Re: cpy functions Michael Angelo Ravera <maravera@prodigy.net> - 2014-04-29 03:07 -0700
    Re: cpy functions Richard <rgrdev_@gmail.com> - 2014-04-29 12:59 +0200
      Re: cpy functions Ben Bacarisse <ben.usenet@bsb.me.uk> - 2014-04-29 13:58 +0100

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