[Fontconfig] mmaping FcInit

[Keith Packard]

Around 13 o'clock on Mar 26, Lars Knoll wrote:

> Won't font database changes require mmaping the new cache file? In that case 
> you probably need a global refcount for all patterns in the mmaped file, so 
> you know when nothing references the old cache file anymore.

Except for the listing API, this is pretty easy.  I fear that applications 
will hold FcFontList results for lengthy periods though, essentially 
locking down old cache files forever.

We need a better listing API in any case, to permit faster matching, so 
perhaps we can fix both problems at the same time.

-keith


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