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Re: Question about symbol_free_list

From: Stefan Monnier
Subject: Re: Question about symbol_free_list
Date: Fri, 30 Dec 2011 06:41:05 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.0.92 (gnu/linux)

> When reading the gc_sweep(), I found symbol_free_list is set to NULL
> everytime garbage collector kicks in. My understanding of this variable
> is it holds up some free symbols and when Emacs is asked to allocate a
> symbol object, it will first look into this list to see if there is one
> available. It serves as kinda 'buffer'. My question is if
> symbol_free_list is not empty when gc_sweep sets it to NULL, how about
> the symbol objects in the list ? Where happened to them ?

IIRC the gc_sweep will traverse all blocks of symbols and will hence
find all the free symbols (both those that were already free before and
those that were discovered by the GC).


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