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Copyright 1991 David Jurgens |
INT 21,58 - Get/Set Memory Allocation Strategy
(Undocumented, DOS 3.x)
AH = 58h
AL = 00 get strategy code
= 01 set strategy code
BX = strategy code (when AL = 01)
= 00 first fit (default)
= 01 best fit
= 02 last fit
on return:
AX = strategy code if CF clear
= error if CF set, see DOS ERROR CODES
- defaults to first fit, first block large enough is chosen
- in first fit, DOS searches the MCB chain from low addresses to
high for the first block large enough to fill the request. For
best fit, DOS searches all memory blocks for the closest fit.
In last fit, DOS starts at high addresses and works downward
and uses the high part of the chosen block
- any strategy value greater than 2 defaults to 2, but the last value
set, even if incorrect, is the value returned by the get strategy
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| Esc or Alt-X to exit |
int 21,58 |
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