On Sat, 3 Jan 2015, Niels Möller wrote:
Honestly, I don't fully understand why we have the customizable
allocation at all. I'm aware of only one real usecase, and that's hooks
into certain types of garbage collectors. And then there's some
*potential* to use them to implement better recovery on allocation
failure, as has been discussed recently, but no one is doing that for
real as far as I know.
Er, people have been using the custom allocators for (possibly imperfect)
recovery on allocation failure for years. PPL's configure script complains
if gmp was compiled without -fexceptions for that reason. Apparently
SWI-Prolog uses longjmp (http://stackoverflow.com/a/14245611/1918193).
To make it possible to really stay in full control of allocation with
GMP, another option is to push forward with the itch/scratch-ifying of
the mpn functions, and then stick to using mpn.
+1
Although itch/scratch may force a compromise between overestimating the
space required or spending too long estimating it, which I hope won't
penalize small numbers too much.
--
Marc Glisse
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