[ECOS] dlmalloc package realloc issue(?)

[Mike Jastrebtsoff <mike at eltronix dot ru>]

Hello, All.

It seems I've found the problem in Doug Lea's malloc implementation.

When calling realloc, algorithm should do the following(Cyg_Mempool_dlmalloc_Implementation::resize_alloc)
:
1. Try expand reallocation block to forward.
2. Try shifting it to backwards.
3. If none of the above mentioned methods work out,
   it should make malloc(new), memcpy(new, old, oldsize), free(old)
   
But it doesn't do that:

Cyg_Mempool_dlmalloc_Implementation::resize_alloc( ...)
{
   ...
   if (!prev_inuse(oldp)) // <-
   {
      ...
   }
   // couldn't resize the allocation any direction, so return failure
   MALLOC_UNLOCK;
   return NULL;
   ...
}

i.e if previous chunk is used,
algorithm returns NULL.

-- 
Regards,
 Mike                          


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