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the malloc/free level, not within the heap abstraction, and there's a
separate lock to control sbrk access.
Also, get rid of the separate `unmap_free_area' function in free.c, and
just put the code in the `free' function directly, which saves a bunch
of space (even compared to using an inline function) for some reason.
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* Instead of using mmap/munmap directly for large allocations, just use
the heap for everything (this is reasonable now that heap memory can
be unmapped).
* Use sbrk instead of mmap/munmap on systems with an MMU.
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smarter than the old "malloc-simple", and actually works, unlike
the old "malloc". So kill the old "malloc-simple" and the old
"malloc" and replace them with Miles' new malloc implementation.
Update Config files to match. Thanks Miles!
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