Re: [MLton] cost of _export

* Bernard Berthomieu:

> For the record, the actual SML application is an xml parser
> relying on libexpat (in C) but with start/end element handlers
> implemented in SML. So it exactly fits the "SML calling C
> calling SML" scenario the patch improves.

I have a toy implementation which uses C callbacks to serialize the
events to a buffer on the C heap.  No C-to-SML callbacks are needed as
a result, and there is only one SML-to-C-and-back transition per input
buffer (4 KiB or so).

Interested?  I could publish the sources as-is if you want to play
with it.

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