wkspace failed allocations with heap protection enabled

[Matthew J Fletcher]

Hi,

Investigating the "Total number of failed allocations:" from the
wkspace cmd i see that;

    /* Statistics */
    ++stats->failed_allocs;

Are incremented when _Heap_Allocate_aligned_with_boundary fails, however it
seems this will routinely fail due to;

_Heap_Protection_free_all_delayed_blocks seemingly on purpose creating an
impossibly large allocation.

    uintptr_t large = 0
      - (uintptr_t) HEAP_BLOCK_HEADER_SIZE
      - (uintptr_t) HEAP_ALLOC_BONUS
      - (uintptr_t) 1;

    void *p = _Heap_Allocate( heap, large );

This makes it difficult to place a breakpoint on failed_allocs to
investigate true low memory situations with heap protection enabled.


regards
---
Matthew J Fletcher