67 lines
1.6 KiB
HTML
67 lines
1.6 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN">
|
|
|
|
<html>
|
|
|
|
<head>
|
|
<meta http-equiv="Content-Type"
|
|
content="text-html; charset=Windows-1252">
|
|
<title>INT 21,49 - Free Allocated Memory</title>
|
|
<meta name="FORMATTER" content="Microsoft FrontPage 2.0">
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<h1><a name="kap_interrupt_2320"></a>INT 21,49 - Free Allocated
|
|
Memory</h1>
|
|
|
|
<p> AH = 49h</p>
|
|
|
|
<p> ES = segment of the block to be returned (~MCB~ + 1para)</p>
|
|
|
|
<p> on return:</p>
|
|
|
|
<p> AX = error code if CF set (see ~DOS ERROR CODES~)</p>
|
|
|
|
<p> - releases memory and MCB allocated by ~INT 21,48~</p>
|
|
|
|
<p> - may cause unpredictable results is memory wasn't allocated
|
|
using</p>
|
|
|
|
<p> INT 21,48 or if memory wasn't allocated by the current
|
|
process</p>
|
|
|
|
<p> - checks for valid MCB id, but does NOT check for process
|
|
ownership</p>
|
|
|
|
<p> - care must be taken when freeing the memory of another
|
|
process, to</p>
|
|
|
|
<p> assure the segment isn't in use by a TSR or ISR</p>
|
|
|
|
<p> - this function is unreliable in a TSR once resident, since</p>
|
|
|
|
<p> COMMAND.COM and many other .COM files take all available
|
|
memory</p>
|
|
|
|
<p> when they load</p>
|
|
|
|
<p> - see INT 21,4A</p>
|
|
|
|
<hr>
|
|
|
|
<table border="0" width="100%" cols="3">
|
|
<tr>
|
|
<td width="33%">Zurück zum <a href="inte1at0.htm">Interrupt
|
|
Info</a>. </td>
|
|
<td align="center" width="33%"><a
|
|
href="mailto:Roger.Morgan@htl-steyr.ac.at">Roger Morgan</a>
|
|
/ 1998 </td>
|
|
<td align="right" width="33%"><font size="1">L.Änderung <!--webbot
|
|
bot="Timestamp" s-type="EDITED" s-format="%d.%m.%y"
|
|
startspan -->29.03.99<!--webbot bot="Timestamp" endspan
|
|
i-checksum="13964" --> </font></td>
|
|
</tr>
|
|
</table>
|
|
</body>
|
|
</html>
|