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<TITLE>Int 21/AH=58h
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Int 21/AH=58h - DOS 2.11+ - GET OR SET MEMORY ALLOCATION STRATEGY -
AH = 58h
AL = subfunction
00h get allocation strategy
Return: AX = current strategy (see #01679)
01h set allocation strategy
BL = new allocation strategy (see #01679)
BH = 00h (DOS 5+)
Return: CF clear if successful
CF set on error
AX = error code (01h) (see #01680)
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<h2>Int 21/AH=58h
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<h3><font color=#C00040>DOS 2.11+ - GET OR SET MEMORY ALLOCATION STRATEGY</font></h3>
<PRE>
AH = 58h
AL = subfunction
00h get allocation strategy
<p><b>Return:</b><br>AX = current strategy (see #01679)
01h set allocation strategy
BL = new allocation strategy <a href="rb-3008.htm#Table1679" tppabs="http://www.ctyme.com/intr/rb-3008.htm#Table1679">(see #01679)</a>
BH = 00h (DOS 5+)<br>
<p><b>Return:</b><br>CF clear if successful
CF set on error
AX = error code (01h) <a href="rb-3012.htm#Table1680" tppabs="http://www.ctyme.com/intr/rb-3012.htm#Table1680">(see #01680)</a>
</PRE>
<p><b>Notes:</b>
The Set subfunction accepts any value in BL for DOS 3.x and 4.x;
2 or greater means last fit.
The Get subfunction returns the last value set.
Setting an allocation strategy involving high memory does not
automatically link in the UMB memory chain; this must be done
explicitly with AX=5803h in order to actually allocate high memory.
A program which changes the allocation strategy should restore it
before terminating.
Toshiba MS-DOS v2.11 supports subfunctions 00h and 01h, as does the
TI Professional MS-DOS v2.13.
DR DOS 3.41 reportedly reverses subfunctions 00h and 01h
<p><b>See Also:</b>
<a href="rb-2934.htm" tppabs="http://www.ctyme.com/intr/rb-2934.htm">AH=48h</a> - <a href="rb-2935.htm" tppabs="http://www.ctyme.com/intr/rb-2935.htm">AH=49h</a> - <a href="rb-2936.htm" tppabs="http://www.ctyme.com/intr/rb-2936.htm">AH=4Ah</a> - <a href="rb-4524.htm" tppabs="http://www.ctyme.com/intr/rb-4524.htm">INT 2F/AX=4310h"XMS"</a> - <a href="javascript:if(confirm('http://www./ \n\nThis file was not retrieved by Teleport Pro, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?'))window.location='http://www./'" tppabs="http://www./"
<PRE>
<p>
<a name=table1679></a>
(Table 01679)
Values for DOS memory allocation strategy:
00h low memory first fit
01h low memory best fit
02h low memory last fit
---DOS 5+ ---
40h high memory first fit
41h high memory best fit
42h high memory last fit
80h first fit, try high then low memory
81h best fit, try high then low memory
82h last fit, try high then low memory
</PRE>
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