mmalloc/TODO

   1 (1)     Make implementation changes necessary to allow multiple processes
   2         to use the mmalloc managed region simultaneously.  This requires,
   3         at the minimum, some sort of cooperative locking that ensures that
   4         only one process at a time is changing any of the mmalloc managed
   5         data structures (its ok for the mmalloc managed data regions to be
   6         changed at any time since we don't care about their contents).
   7
   8 (2)     In order to support multiple processes using the mmalloc managed
   9         region, the malloc descriptor needs to be broken into two parts,
  10         one part which is specific to the given process and is maintained
  11         separately on a per process basis, and another part which is common
  12         to all processes.  As an example, the file descriptor is specific
  13         to a given process, as are the morecore and abortfunc pointers.
  14         However magic[], the version number, the flags field, etc are
  15         common to all processes.