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Things that still need attention:
* Make implementation changes necessary to allow multiple processes
to use the mmalloc managed region simultaneously. This requires,
at the minimum, some sort of cooperative locking that ensures that
only one process at a time is changing any of the mmalloc managed
data structures (its ok for the mmalloc managed data regions to be
changed at any time since we don't care about their contents).
* In order to support multiple processes using the mmalloc managed
region, the malloc descriptor needs to be broken into two parts,
one part which is specific to the given process and is maintained
separately on a per process basis, and another part which is common
to all processes. As an example, the file descriptor is specific
to a given process, as are the morecore and abortfunc pointers.
However magic[], the version number, the flags field, etc are
common to all processes.
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