problem with memory allocation

[joel at OARcorp.com (joel at OARcorp.com)]

On Tue, 3 Aug 1999, D. V. Henkel-Wallace wrote:

> At 10:26 03-08-99 -0500, joel at oarcorp.com wrote:
> >malloc is built on top of Region which is built on top of a Heap.
> 
> Does anybody on this list actually take advantage of this layering?

I will actually go so far as to say that virtually no one has ever had
multiple regions in the same application.

The only cases I can think of are where the second region was used to
manage some special purpose memory.

> Everybody who uses malloc or new uses the same single region.  I can 
> understand wanting to use different regions for some applications, but 
> different heaps?

Logically, a region is just an RTEMS SuperCore heap with optional blocking
capability.  

There are always two SuperCore heaps in an application -- the executive
workspace (directly a SuperCore heap) and the C program heap (a region
which is built on top of a SuperCore heap).

The layering is:

  + Ada or C++ new
     + C Heap (malloc)
        + Region
           + SuperCore Heap

  + Executive Workspace
      + SuperCoreHeap
   
Perhaps since the confusion arose because I said heap and meant SuperCore
Heap not "C Program Heap".   It would be easy to do.