11-25-2012
Here are the first reasons that come to mind:
- easily detect bogus code that reference unallocated memory
- avoid exhausting the system virtual memory for those operating systems that do not overcommit memory
- allow non heap memory to exist, eg. allow a new thread to get its own stack
- allow libraries that manage memory allocation (like libc malloc/free) to know what part of memory they own so can use the way they like.
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