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* avoid over-allocation of brk on first mallocRich Felker2011-04-011-4/+4
| | | | | | | if init_malloc returns positive (successful first init), malloc will retry getting a chunk from the free bins rather than expanding the heap again. also pass init_malloc a hint for the size of the initial allocation.
* very cheap double-free checks in mallocRich Felker2011-03-231-0/+4
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* make malloc(0) return unique pointers rather than NULLRich Felker2011-02-201-5/+9
| | | | | | | this change is made with some reluctance, but i think it's for the best. correct programs must handle either behavior, so there is little advantage to having malloc(0) return NULL. and i managed to actually make the malloc code slightly smaller with this change.
* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-121-0/+515