Hi IVAN,

 you wrote at 29.12.98  15:00 to DENIS TONN:
 
 IT>    Do you get a single descritor with a 1000000 byte limit, or a
 IT> bunch    of small descriptors with 65536 limits?

In a 32 bit process you will become 245 descriptors. Each describes a
single page of 4 KB. Then you can acces all Bytes in a range of 245 * 4KB.

Lets look at the dimenson:

1000000 / 4096 = 245 pages

x[1003519] is functional altough it's is illegal from your view.
           The processor (and the operatingsystem) can bounds check only
	   on boundary of a single page = 4096 Bytes.
x[1003520] will crash with access violation. It will address the unallocated
           page 246.

You'll become a logical continuous block of memory. It my or my not
physical continous. From view as application programmer it dosn't matter if
all pages bounded physically or not. Because the processor works with
virtual addressspace.

Each DosAllocMem() gets you an logical block of memory with a integer
number of single pages guaranteed of the requested size - with an overhead
up to the next page border. But never will 2 separate DosAllocMem get you a
block continous of both.

Tschau/Bye

Herbert


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