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MCL ephemeral GC implementation

A while back an MCL developer mentioned to me that the MCL EGC used
page-level read or write protections to trap memory references.  I am
now working on an application (not in MCL, sigh) that could make good
use of page-level protections.  If I understood the developer correctly,
is there an exported Mac OS interface to the page protection bits, and,
if so, is there any documentation on it?

--David Gadbois