At 1:02 PM +0100 12/3/99, Danko Radic wrote:
>Just one question when we came onto that: is that chunk allocated in The
>Heap - the same one where the variables, globals etc allocate their space
>and is very expensive to use?
Read the article Bob mentioned:
http://oasis.palm.com/devzone/knowledgebasearticle.cfm?article_id=1145
This paper describes the heaps in detail. To answer your specific question: MemPtrNew
and MemHandleNew both allocate a chunk in the dynamic heap. DmNewHandle allocates a
chunk in the storage heap, as does DmNewRecord. The storage heap is protected from
accidental writes; you have to use DmWrite, etc to write to it. This is slower than
direct writes to chunks in the dynamic heap. So whether you use MemPtrNew or
MemHandleNew has no effect on the performance of subsequent writes to the chunk. The
difference is how the dynamic heap gets fragmented, which affects the performance of
subsequent allocations.
-
Danny Epstein, Applied Thought Corporation
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