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7<TITLE>OS_ReferentSize</TITLE>
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11<H1 align="left">OS_ReferentSize <IMG src="../../image/NTR.gif" align="middle"><IMG src="../../image/TWL.gif" align="middle"></H1>
12<H2>Syntax</H2>
13<DL>
14  <DD>
15  <PRE><CODE>#include &lt;nitro/os.h&gt;</CODE></PRE>
16  <PRE><CODE>void OS_ReferentSize( OSArenaId id, void* ptr );</CODE></PRE>
17</DL>
18<H2>Arguments</H2>
19<TABLE border="1" width="100%">
20  <TBODY>
21    <TR>
22      <TD width="13%"><EM><STRONG>id</STRONG></EM></TD>
23      <TD width="87%">ID of the arena associated with the memory block</TD>
24    </TR>
25    <TR>
26      <TD><B><I>ptr</I></B></TD>
27      <TD>Pointer to the memory block.</TD>
28    </TR>
29  </TBODY>
30</TABLE>
31<H2>Return Values</H2>
32<P>Returns the size of the specified main block in memory, excluding the header region for managing the memory block. &nbsp;</P>
33<H2>Description</H2>
34<P>Acquires the size that the specified main block occupies in memory, excluding the header region for managing the memory block.</P>
35<P>&nbsp;<BR><B><I>id</I></B> specifies the arena ID that contains the memory block. To read more about this value, see <a  href="../arena/OS_InitArena.html"><code>OS_InitArena</code></a>.</P>
36<P><EM><STRONG><CODE>ptr</CODE></STRONG></EM> is the address to the memory block that is previously acquired with <CODE>OS_AllocFixed()</CODE>, <CODE>OS_AllocFromHeap()</CODE>, etc. </P>
37<H2>See Also</H2>
38<P><CODE><A href="../arena/OS_InitArena.html">OS_InitArena</A></code>, <code><A href="OS_InitAlloc.html">OS_InitAlloc</A></code>, <code><A href="OS_AllocFromHeap.html">OS_AllocFromHeap</A></code>, <code><A href="OS_AllocFixed.html">OS_AllocFixed</A></CODE></P>
39<H2>Revision History</H2>
40<P>2004/01/07 Initial version.</P>
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