Angus Gratton b0c5665f15 heap: Fix race condition causing malloc() to fail under some conditions
During a call to multi_heap_malloc(), if both these conditions were true:
- That heap only has one block large enough for the allocation
  (this is always the case if the heap is unfragmented).
- Another allocation is simultaneously occurring in the same heap.

... multi_heap_malloc() could incorrectly return NULL.

This caused IDF heap_caps_malloc() and malloc() to also fail, particularly
often if only one or two heaps had space for the allocation (otherwise
heap_caps_malloc() fails over to the next heap).
2017-10-19 16:05:00 +08:00
..
2017-09-07 16:32:05 +10:00