Re: [Gc] allocation with lowest overhead

GC_MALLOC_WORDS will work. You don't get tiny_fl from somewhere, you
allocate it yourself as your own private fast-access cache of objects.

As it says in the include file:

"Tiny_fl should be an array of GC_TINY_FREELISTS void * pointers."

If you're using GC_MALLOC_WORDS() then you can just initialise your tiny_fl
array to zeros before the first use.



On Mon, May 26, 2014 at 3:57 PM, Kenjiro Taura <[email protected]
> wrote:

> Hi,
>
> What is the fastest, yet portable way to allocate
> a small object in recent versions (e.g., 7.4.0)?
> The current interface seems more complex than what
> it used to be many years ago.
>
> Below, I am seeing 7.4.0 sources.
>
> I initially thought:
>
> # define GC_MALLOC_WORDS(result,n,tiny_fl)
>
> in gc_inline.h is the one I should use, but it
> requires tiny_fl argument I must obtain somehow.
>
> Digging into GC_malloc in thread_local_alloc.c,
> I found that the following line eventually gets it.
>
>     tiny_fl = ((GC_tlfs)tsd) -> normal_freelists;
>
> The next question then is how to get tsd, for
> which a fairly complex conditional compilation
> is going on.  Ignoring portability for a moment,
> I figured out that
>
>       tsd = GC_getspecific(GC_thread_key);
>
> is it.
>
> I tried copied and pasted it into my source and
> got compilation errors.  All in all, I feel I am
> not on the right track; they seem intentionally
> kept private inside a collector implementation.
>
> I started feeling I am missing some functions that
> portably return what needs to be passed to
> GC_MALLOC_WORDS, but could not find any so far.
>
> I appreciate if anybody sheds light on it.
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