[Python-Dev] pymalloc killer

[Tim Peters]

Heh -- letting old vectors leak may still not be good enough.  Martin posted
the relevant code:

	((I) < narenas && (uptr)(P) - arenas[I] < (uptr)ARENA_SIZE)

The problem remaining is that narenas can get out of synch with arenas, and
if narenas refers to a later arena size, arenas[I] may be an out-of-bounds
reference.  This may be a good reason to make "narenas" and "arenas"
volatile, in order to ensure that the former is read up before the latter.