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Re: How and when to use GCPRO?
From: |
Daniel Colascione |
Subject: |
Re: How and when to use GCPRO? |
Date: |
Mon, 27 Dec 2010 19:37:17 -0800 |
User-agent: |
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.13) Gecko/20101207 Thunderbird/3.1.7 |
On 12/27/10 6:17 PM, Stefan Monnier wrote:
>>>>> Actually, both Fcar and Fcdr can GC (by signalling an error which
>>>>> triggers the debugger).
>>>> But the debugger will not return.
>>> Oh, right,
>> Discussions like this worry me. What if the function is later changed to
>> call something that can GC? What if it's used in some new context? If
>> it's not utterly performance-critical code, isn't it better to be safe
>> than sorry and GCPRO anyway? It's not as if it's an expensive operation.
>> Premature optimization is the root of all evil, after all.
>
> On most platforms, GCPRO is a no-op, and on those where it's not, it's
> never been a major performance issue, AFAIK. The problem is just that
> it makes the code that much more verbose and painful to
> write/read/maintain.
Hrm. You learn something every day --- I thought Emacs was doing precise
GC the way it has since time immemorial. How much of a win was the
GC_MARK_STACK conservative scanning approach?
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- How and when to use GCPRO?, Leo, 2010/12/27
- Re: How and when to use GCPRO?, Andreas Schwab, 2010/12/27
- Re: How and when to use GCPRO?, Leo, 2010/12/27
- Re: How and when to use GCPRO?, Stefan Monnier, 2010/12/27
- Re: How and when to use GCPRO?, Andreas Schwab, 2010/12/27
- Re: How and when to use GCPRO?, Stefan Monnier, 2010/12/27
- Re: How and when to use GCPRO?, Daniel Colascione, 2010/12/27
- Re: How and when to use GCPRO?, Stefan Monnier, 2010/12/27
- Re: How and when to use GCPRO?,
Daniel Colascione <=
- Re: How and when to use GCPRO?, Stefan Monnier, 2010/12/27
- Conservative scanning (was: Re: How and when to use GCPRO?), Daniel Colascione, 2010/12/27
- Re: How and when to use GCPRO?, Richard Stallman, 2010/12/28
- Re: How and when to use GCPRO?, Leo, 2010/12/27
- Common Lisp like feature expressions (was: How and when to use GCPRO?), Leo, 2010/12/27
- Re: Common Lisp like feature expressions (was: How and when to use GCPRO?), Andreas Schwab, 2010/12/27
- Re: Common Lisp like feature expressions (was: How and when to use GCPRO?), Leo, 2010/12/27
- Re: Common Lisp like feature expressions, Stefan Monnier, 2010/12/27
- Re: Common Lisp like feature expressions, Leo, 2010/12/28