* Is there any possible memory leak in GC?
@ 2007-12-13 15:21 Herbert Euler
2007-12-13 16:36 ` Stefan Monnier
0 siblings, 1 reply; 3+ messages in thread
From: Herbert Euler @ 2007-12-13 15:21 UTC (permalink / raw)
To: emacs-devel
Hello,
Here is just a possibly stupid question on GC.
After watching the use of `cons_free_list', I am confused about it.
`cons_free_list' holds the unmarked cons cells during GC sweeping.
When `cons' creates new cons cells, it picks any ones in
`cons_free_list' if possible. But each time when sweeping happens,
`cons_free_list' is reset to 0, and its previous value is lost. Since
GC can run at any time with `garbage-collect', will this lead to
memory leak or not?
Regards,
Guanpeng Xu
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Is there any possible memory leak in GC?
2007-12-13 15:21 Is there any possible memory leak in GC? Herbert Euler
@ 2007-12-13 16:36 ` Stefan Monnier
2007-12-13 23:48 ` Herbert Euler
0 siblings, 1 reply; 3+ messages in thread
From: Stefan Monnier @ 2007-12-13 16:36 UTC (permalink / raw)
To: Herbert Euler; +Cc: emacs-devel
> After watching the use of `cons_free_list', I am confused about it.
> `cons_free_list' holds the unmarked cons cells during GC sweeping.
> When `cons' creates new cons cells, it picks any ones in
> `cons_free_list' if possible. But each time when sweeping happens,
> `cons_free_list' is reset to 0, and its previous value is lost. Since
> GC can run at any time with `garbage-collect', will this lead to
> memory leak or not?
No, it should not lead to any leak because it will find all the cells
that were still on the cons_free_list and add them back, while sweeping
the cons blocks.
Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: Is there any possible memory leak in GC?
2007-12-13 16:36 ` Stefan Monnier
@ 2007-12-13 23:48 ` Herbert Euler
0 siblings, 0 replies; 3+ messages in thread
From: Herbert Euler @ 2007-12-13 23:48 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
>> After watching the use of `cons_free_list', I am confused about it.
>> `cons_free_list' holds the unmarked cons cells during GC sweeping.
>> When `cons' creates new cons cells, it picks any ones in
>> `cons_free_list' if possible. But each time when sweeping happens,
>> `cons_free_list' is reset to 0, and its previous value is lost. Since
>> GC can run at any time with `garbage-collect', will this lead to
>> memory leak or not?
>
> No, it should not lead to any leak because it will find all the cells
> that were still on the cons_free_list and add them back, while sweeping
> the cons blocks.
Ah, I have found the gap between my understanding and the
fact. Thank you! :D
Regards,
Guanpeng Xu
_________________________________________________________________
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2007-12-13 15:21 Is there any possible memory leak in GC? Herbert Euler
2007-12-13 16:36 ` Stefan Monnier
2007-12-13 23:48 ` Herbert Euler
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