* Re: GNU Guile branch, master, updated. v2.1.0-163-g283ab48
[not found] <E1S5LBe-00014e-4I@vcs.savannah.gnu.org>
@ 2012-03-08 2:29 ` Mark H Weaver
2012-03-08 9:09 ` Andy Wingo
0 siblings, 1 reply; 4+ messages in thread
From: Mark H Weaver @ 2012-03-08 2:29 UTC (permalink / raw)
To: Andy Wingo; +Cc: guile-devel
Hi Andy,
> commit 283ab48d3f20a5c5281cafc29f0c30c8d8ace9ee
> Author: Andy Wingo <wingo-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>
> Date: Wed Mar 7 19:01:56 2012 +0100
>
> faster (make-prompt-tag); default-prompt-tag is a parameter
>
> * module/ice-9/boot-9.scm (default-prompt-tag): Once parameters have
> booted, redefine as a parameter.
I fear that making 'default-prompt-tag' a parameter might slow things
down quite a bit on platforms with a slow implementation of thread local
storage.
What's the anticipated use case for this?
Thanks,
Mark
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: GNU Guile branch, master, updated. v2.1.0-163-g283ab48
2012-03-08 2:29 ` GNU Guile branch, master, updated. v2.1.0-163-g283ab48 Mark H Weaver
@ 2012-03-08 9:09 ` Andy Wingo
2012-03-08 14:28 ` Mark H Weaver
0 siblings, 1 reply; 4+ messages in thread
From: Andy Wingo @ 2012-03-08 9:09 UTC (permalink / raw)
To: Mark H Weaver; +Cc: guile-devel
Hi,
On Thu 08 Mar 2012 03:29, Mark H Weaver <mhw@netris.org> writes:
>> commit 283ab48d3f20a5c5281cafc29f0c30c8d8ace9ee
>> Author: Andy Wingo <wingo-e+AXbWqSrlAAvxtiuMwx3w@public.gmane.org>
>> Date: Wed Mar 7 19:01:56 2012 +0100
>>
>> faster (make-prompt-tag); default-prompt-tag is a parameter
>>
>> * module/ice-9/boot-9.scm (default-prompt-tag): Once parameters have
>> booted, redefine as a parameter.
>
> I fear that making 'default-prompt-tag' a parameter might slow things
> down quite a bit on platforms with a slow implementation of thread local
> storage.
Not the case! It shouldn't depend on thread-local storage at all
actually since the VM already has a handle on the current thread and
dynamic state.
> What's the anticipated use case for this?
Parameterizing default prompts? It allows users to re-set the
user/system process boundary for a dynamic extent.
Andy
--
http://wingolog.org/
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: GNU Guile branch, master, updated. v2.1.0-163-g283ab48
2012-03-08 9:09 ` Andy Wingo
@ 2012-03-08 14:28 ` Mark H Weaver
2012-03-08 14:34 ` Andy Wingo
0 siblings, 1 reply; 4+ messages in thread
From: Mark H Weaver @ 2012-03-08 14:28 UTC (permalink / raw)
To: Andy Wingo; +Cc: guile-devel
Andy Wingo <wingo@pobox.com> writes:
>> I fear that making 'default-prompt-tag' a parameter might slow things
>> down quite a bit on platforms with a slow implementation of thread local
>> storage.
>
> Not the case! It shouldn't depend on thread-local storage at all
> actually since the VM already has a handle on the current thread and
> dynamic state.
Ah yes, indeed that is true.
>> What's the anticipated use case for this?
>
> Parameterizing default prompts? It allows users to re-set the
> user/system process boundary for a dynamic extent.
Okay, makes sense. Sorry for the bother.
Thanks!
Mark
^ permalink raw reply [flat|nested] 4+ messages in thread* Re: GNU Guile branch, master, updated. v2.1.0-163-g283ab48
2012-03-08 14:28 ` Mark H Weaver
@ 2012-03-08 14:34 ` Andy Wingo
0 siblings, 0 replies; 4+ messages in thread
From: Andy Wingo @ 2012-03-08 14:34 UTC (permalink / raw)
To: Mark H Weaver; +Cc: guile-devel
On Thu 08 Mar 2012 15:28, Mark H Weaver <mhw@netris.org> writes:
>>> What's the anticipated use case for this?
>>
>> Parameterizing default prompts? It allows users to re-set the
>> user/system process boundary for a dynamic extent.
>
> Okay, makes sense. Sorry for the bother.
No problem. I don't have a deep understanding of how default prompts
can / should be used. Something that needs some experience, I think.
Regards,
Andy
--
http://wingolog.org/
^ permalink raw reply [flat|nested] 4+ messages in thread
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2012-03-08 2:29 ` GNU Guile branch, master, updated. v2.1.0-163-g283ab48 Mark H Weaver
2012-03-08 9:09 ` Andy Wingo
2012-03-08 14:28 ` Mark H Weaver
2012-03-08 14:34 ` Andy Wingo
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