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Re: multi-threading in Forth?

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Zbiggy <zbigniew2011REMOVE@gmail.remove.com> wrote:
> In comp.lang.forth, Stephen Pelc wrote:
> 
>> In practice, embedded Forths using 8051s may keep return addresses on
>> a third stack. However, what you see more often is that a return
>> address may be larger than a cell size (DSP, PIC ...) or may not be
>> formatted as you expect (e.g. Cortex-M has bit 0 always set).
>>
>> Hence, there are occasion when you *need* to isolate the return
>> address words because they are not just R@ and friends. Yes, this
>> sort of problem is seen regularly.
> 
> Of course, it's better to create Forth compiler with "strange return
> stack", than to not make it at all. But I understand the described
> situation rather as a rationale, why ANS-standard doesn't impose the
> strict rules about stack: "...because sometimes can be not possible
> to fulfil such requirement" - than as a statement: "actually, return
> stack can be implemented in any way". Yes: formally it can - it
> isn't forbidden by law, therefore no Forth creator will be punished
> - but the question is: should it really be treated so blithely?

I think so.  There is the matter of whether, say, return stack
manipulation is more useful than tail call optimization.  I'd choose
tail call optimization every time, but IME code that (ab)uses the
return stack for control flow is hard to understand and maintain.
Whatever the problem, there's almost always a better way to do it than
fiddling with the R-stack.

> Andy Valencia, ForthOS creator, proposed to use larger blocks - 4096
> instead of "traditional" 1024 bytes - and it does make sense,
> because meanwhile the HDD vendors changed the size of basic sector
> unit to... 4096 bytes (from 512).

Yes, it makes very good sense to do this.  However, given a 4096-byte
block buffer, you can easily get a compatible BLOCK with

: block ( n - a)   4 /mod big-block  swap 1024 * + ;

So, there is no need for application code to be affected by the use of
big blocks.

Andrew.

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multi-threading in Forth? Michael L Gassanenko <m_l_g3@yahoo.com> - 2011-08-02 02:01 -0700
  Re: multi-threading in Forth? mhx@iae.nl (Marcel Hendrix) - 2011-08-02 11:22 +0200
    Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-02 15:26 +0200
    Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-04 01:06 +0400
      Re: multi-threading in Forth? mhx@iae.nl (Marcel Hendrix) - 2011-08-04 06:36 +0200
        Re: multi-threading in Forth? Mark Wills <markrobertwills@yahoo.co.uk> - 2011-08-04 08:25 +0100
          Re: multi-threading in Forth? coos haak <chforth@hccnet.nl> - 2011-08-04 13:42 +0200
            Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-04 14:35 +0200
              Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-04 08:30 -0500
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-04 15:38 +0200
                Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-04 09:12 -0500
                Re: multi-threading in Forth? Mark Wills <markrobertwills@yahoo.co.uk> - 2011-08-04 16:50 +0100
                Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-04 23:52 +0400
                Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-05 08:50 -0500
                Re: multi-threading in Forth? Mark Wills <markrobertwills@yahoo.co.uk> - 2011-08-04 16:49 +0100
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-04 19:23 +0200
                Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-05 10:57 -0500
              Re: multi-threading in Forth? stephenXXX@mpeforth.com (Stephen Pelc) - 2011-08-04 14:16 +0000
                Re: multi-threading in Forth? Mark Wills <markrobertwills@yahoo.co.uk> - 2011-08-04 16:51 +0100
                Re: multi-threading in Forth? stephenXXX@mpeforth.com (Stephen Pelc) - 2011-08-04 17:14 +0000
                Re: multi-threading in Forth? "Rod Pemberton" <do_not_have@noavailemail.cmm> - 2011-08-06 03:46 -0400
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-04 19:11 +0200
                Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-05 08:43 -0500
                Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-06 01:49 +0400
                Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-06 03:13 -0500
                Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-09 04:41 +0400
                Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-09 11:01 +0400
                Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-10 09:02 -0500
                Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-11 01:10 +0400
                Re: multi-threading in Forth? Ouatu Bogdan <ouatubi@gmail.com> - 2011-08-10 13:22 +0000
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-06 01:12 +0200
                Re: multi-threading in Forth? coos haak <chforth@hccnet.nl> - 2011-08-06 02:37 +0200
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-06 12:54 +0200
                Re: multi-threading in Forth? alextangent <blog@rivadpm.com> - 2011-08-06 12:15 +0100
                Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-05 22:23 -0500
                Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-06 03:17 -0500
                Re: multi-threading in Forth? Julian Fondren <ayrnieu@gmail.com> - 2011-08-05 19:02 -0500
                Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-06 04:01 -0500
                return-address manipulation (was: multi-threading in Forth?) anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-08-06 16:35 +0000
                Re: return-address manipulation Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2011-08-07 11:45 +0100
                Re: return-address manipulation Josh Grams <josh@qualdan.com> - 2011-08-08 09:40 +0000
                Re: return-address manipulation Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2011-08-08 12:17 +0100
                Re: return-address manipulation Josh Grams <josh@qualdan.com> - 2011-08-08 12:29 +0000
                Re: return-address manipulation mlg3 <m_l_g3@yahoo.com> - 2011-08-09 03:54 +0400
                Re: return-address manipulation mlg3 <m_l_g3@yahoo.com> - 2011-08-09 02:52 +0400
                Re: return-address manipulation Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2011-08-09 20:54 +0100
                Re: return-address manipulation mlg3 <m_l_g3@yahoo.com> - 2011-08-11 09:00 +0400
                Re: return-address manipulation Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-09 14:49 -0500
                Re: return-address manipulation anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2011-08-10 09:03 +0000
                Re: return-address manipulation Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-10 05:13 -0500
                Re: return-address manipulation mlg3 <m_l_g3@yahoo.com> - 2011-08-11 09:24 +0400
                Re: return-address manipulation Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-11 04:09 -0500
                Re: return-address manipulation mlg3 <m_l_g3@yahoo.com> - 2011-08-11 09:36 +0400
                Re: return-address manipulation mlg3 <m_l_g3@yahoo.com> - 2011-08-11 09:54 +0400
                Re: return-address manipulation Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-11 04:16 -0500
                Re: multi-threading in Forth? Julian Fondren <ayrnieu@gmail.com> - 2011-08-07 01:43 -0500
                Re: multi-threading in Forth? Spam@ControlQ.com - 2011-08-06 12:36 -0400
                Re: multi-threading in Forth? Julian Fondren <ayrnieu@gmail.com> - 2011-08-07 01:13 -0500
                Re: multi-threading in Forth? mlg3 <m_l_g3@yahoo.com> - 2011-08-09 02:35 +0400
                Re: multi-threading in Forth? Albert van der Horst <albert@spenarnc.xs4all.nl> - 2011-08-07 10:08 +0000
                Re: multi-threading in Forth? Josh Grams <josh@qualdan.com> - 2011-08-07 13:45 +0000
                Re: multi-threading in Forth? mhx@iae.nl (Marcel Hendrix) - 2011-08-05 17:17 +0200
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-05 19:23 +0200
                Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-05 10:53 -0500
                Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-05 19:18 +0200
                Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-06 09:59 -0500
                Re: multi-threading in Forth? Spam@ControlQ.com - 2011-08-06 12:28 -0400
                Re: multi-threading in Forth? Albert van der Horst <albert@spenarnc.xs4all.nl> - 2011-08-06 11:29 +0000
            Re: multi-threading in Forth? Mark Wills <markrobertwills@yahoo.co.uk> - 2011-08-04 16:47 +0100
              Re: multi-threading in Forth? Julian Fondren <ayrnieu@gmail.com> - 2011-08-04 13:54 -0500
              Re: multi-threading in Forth? coos haak <chforth@hccnet.nl> - 2011-08-04 22:02 +0200
  Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-02 08:23 -0500
    Re: multi-threading in Forth? Zbiggy <zbigniew2011REMOVE@gmail.REMOVE.com> - 2011-08-02 15:30 +0200
      Re: multi-threading in Forth? Elizabeth D Rather <erather@forth.com> - 2011-08-02 08:53 -0500
        Re: multi-threading in Forth? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2011-08-03 03:53 -0500

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