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>         Memory pool Management Functions</TITLE
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NAME="COMPAT-UITRON-MEMORY-POOL-MGMT-FUNCTIONS">Memory pool Management Functions</H1
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><P
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>These functions are fully supported in this release: </P
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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>get_blf</TT
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>(
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    VP *<SPAN
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><I
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CLASS="EMPHASIS"
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>p_blf,</I
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></SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mpfid</I
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>pget_blf</TT
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>(
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    VP *<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>p_blf,</I
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></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mpfid</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>tget_blf</TT
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>(
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    VP *<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>p_blf,</I
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></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mpfid,</I
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></SPAN
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>    TMO <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tmout</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
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CLASS="FUNCTION"
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>rel_blf</TT
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>(
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    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mpfid,</I
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></SPAN
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>    VP <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>blf</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
215
CLASS="FUNCTION"
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>ref_mpf</TT
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>(
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    T_RMPF *<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>pk_rmpf,</I
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></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mpfid</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
243
CLASS="FUNCTION"
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>get_blk</TT
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>(
246
    VP *<SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>p_blk,</I
251
></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mplid,</I
257
></SPAN
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>    INT <SPAN
259
CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>blksz</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
277
CLASS="FUNCTION"
278
>pget_blk</TT
279
>(
280
    VP *<SPAN
281
CLASS="emphasis"
282
><I
283
CLASS="EMPHASIS"
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>p_blk,</I
285
></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mplid,</I
291
></SPAN
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>    INT <SPAN
293
CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>blksz</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
311
CLASS="FUNCTION"
312
>tget_blk</TT
313
>(
314
    VP *<SPAN
315
CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>p_blk,</I
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></SPAN
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>    ID <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>mplid,</I
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></SPAN
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>    INT <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>blksz,</I
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></SPAN
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>    TMO <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tmout</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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>ER <TT
351
CLASS="FUNCTION"
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>rel_blk</TT
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>(
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    ID <SPAN
355
CLASS="emphasis"
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><I
357
CLASS="EMPHASIS"
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>mplid,</I
359
></SPAN
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>    VP <SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>blk</I
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></SPAN
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> )</PRE
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></TD
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></TR
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></TABLE
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><TABLE
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BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
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><TD
376
><PRE
377
CLASS="PROGRAMLISTING"
378
>ER <TT
379
CLASS="FUNCTION"
380
>ref_mpl</TT
381
>(
382
    T_RMPL *<SPAN
383
CLASS="emphasis"
384
><I
385
CLASS="EMPHASIS"
386
>pk_rmpl,</I
387
></SPAN
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>    ID <SPAN
389
CLASS="emphasis"
390
><I
391
CLASS="EMPHASIS"
392
>mplid )</I
393
></SPAN
394
></PRE
395
></TD
396
></TR
397
></TABLE
398
><P
399
>Note that of the memory provided for a particular pool to
400
manage in the static initialization of the memory pool objects,
401
some memory will be used to manage the pool itself. Therefore the
402
number of blocks * the blocksize will be less than the total
403
memory size. </P
404
><P
405
>The following functions are supported in this release, when
406
enabled with
407
<TT
408
CLASS="LITERAL"
409
>CYGPKG_UITRON_MEMPOOLVAR_CREATE_DELETE</TT
410
>
411
or
412
<TT
413
CLASS="LITERAL"
414
>CYGPKG_UITRON_MEMPOOLFIXED_CREATE_DELETE</TT
415
>
416
as appropriate, with some restrictions: </P
417
><TABLE
418
BORDER="5"
419
BGCOLOR="#E0E0F0"
420
WIDTH="70%"
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><TR
422
><TD
423
><PRE
424
CLASS="PROGRAMLISTING"
425
>ER <TT
426
CLASS="FUNCTION"
427
>cre_mpl</TT
428
>(
429
    ID <SPAN
430
CLASS="emphasis"
431
><I
432
CLASS="EMPHASIS"
433
>mplid,</I
434
></SPAN
435
>    T_CMPL *<SPAN
436
CLASS="emphasis"
437
><I
438
CLASS="EMPHASIS"
439
>pk_cmpl</I
440
></SPAN
441
> )</PRE
442
></TD
443
></TR
444
></TABLE
445
><TABLE
446
BORDER="5"
447
BGCOLOR="#E0E0F0"
448
WIDTH="70%"
449
><TR
450
><TD
451
><PRE
452
CLASS="PROGRAMLISTING"
453
>ER <TT
454
CLASS="FUNCTION"
455
>del_mpl</TT
456
>(
457
    ID <SPAN
458
CLASS="emphasis"
459
><I
460
CLASS="EMPHASIS"
461
>mplid</I
462
></SPAN
463
> )</PRE
464
></TD
465
></TR
466
></TABLE
467
><TABLE
468
BORDER="5"
469
BGCOLOR="#E0E0F0"
470
WIDTH="70%"
471
><TR
472
><TD
473
><PRE
474
CLASS="PROGRAMLISTING"
475
>ER <TT
476
CLASS="FUNCTION"
477
>cre_mpf</TT
478
>(
479
    ID <SPAN
480
CLASS="emphasis"
481
><I
482
CLASS="EMPHASIS"
483
>mpfid,</I
484
></SPAN
485
>    T_CMPF *<SPAN
486
CLASS="emphasis"
487
><I
488
CLASS="EMPHASIS"
489
>pk_cmpf</I
490
></SPAN
491
> )</PRE
492
></TD
493
></TR
494
></TABLE
495
><TABLE
496
BORDER="5"
497
BGCOLOR="#E0E0F0"
498
WIDTH="70%"
499
><TR
500
><TD
501
><PRE
502
CLASS="PROGRAMLISTING"
503
>ER <TT
504
CLASS="FUNCTION"
505
>del_mpf</TT
506
>(
507
    ID <SPAN
508
CLASS="emphasis"
509
><I
510
CLASS="EMPHASIS"
511
>mpfid</I
512
></SPAN
513
> )</PRE
514
></TD
515
></TR
516
></TABLE
517
><P
518
>Because of the static initialization facilities provided for
519
system objects, a memory pool is allocated a region of memory to
520
manage statically in the configuration. So while memory pools can
521
be created and deleted, the same area of memory is used for that
522
memory pool (memory pool ID number) each time. The requested variable pool
523
size (pk_cmpl-&gt;mplsz) or the number of fixed-size
524
blocks (pk_cmpf-&gt;mpfcnt) times the block size
525
(pk_cmpf-&gt;blfsz) are checked for fitting within
526
the statically allocated memory area, so if a create call succeeds,
527
the resulting pool will be at least as large as that requested.
528
For this reason <TT
529
CLASS="FUNCTION"
530
>del_mpl()</TT
531
> and <TT
532
CLASS="FUNCTION"
533
>del_mpf()</TT
534
> do
535
not in any sense free the memory that was managed by the deleted
536
pool for use by other pools; it may only be managed by a pool of
537
the same object id. </P
538
><P
539
>For both fixed and variable memory pools, the queueing order
540
when waiting on a synchronization object depends on the underlying
541
kernel configuration. The multi-level queue scheduler is required
542
for strict &micro;ITRON conformance and
543
it queues tasks in FIFO order, so requests to create an object with
544
priority queueing of tasks (pk_cxxx-&gt;xxxatr = TA_TPRI)
545
are rejected with E_RSATR. Additional undefined bits in
546
the attributes fields must be zero. </P
547
><P
548
>In general, extended information (pk_cxxx-&gt;exinf)
549
is ignored. </P
550
><DIV
551
CLASS="SECT2"
552
><H2
553
CLASS="SECT2"
554
><A
555
NAME="AEN13913">Error checking</H2
556
><P
557
>The following conditions are only checked for, and only return
558
errors if
559
<TT
560
CLASS="LITERAL"
561
>CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
562
>
563
is enabled:</P
564
><P
565
></P
566
><UL
567
><LI
568
><P
569
>invalid object id; less than 1 or greater than
570
<TT
571
CLASS="LITERAL"
572
>CYGNUM_UITRON_MEMPOOLVAR/MEMPOOLFIXED</TT
573
>
574
as appropriate returns E_ID</P
575
></LI
576
><LI
577
><P
578
>dispatching is enabled in any call which can sleep, or
579
E_CTX</P
580
></LI
581
><LI
582
><P
583
>tmout must be positive, otherwise E_PAR</P
584
></LI
585
><LI
586
><P
587
>pk_cxxx pointers in
588
<TT
589
CLASS="FUNCTION"
590
>cre_xxx()</TT
591
>
592
 must be valid pointers, or E_PAR</P
593
></LI
594
><LI
595
><P
596
>return value pointer in
597
<TT
598
CLASS="FUNCTION"
599
>ref_xxx()</TT
600
>
601
 is a valid pointer, or E_PAR</P
602
></LI
603
><LI
604
><P
605
>return value pointers in get block routines is a valid
606
pointer, or E_PAR</P
607
></LI
608
><LI
609
><P
610
>blocksize request in get variable block routines is greater
611
than zero, or E_PAR</P
612
></LI
613
></UL
614
><P
615
>The following conditions are checked for, and can return error
616
codes, regardless of the setting of
617
<TT
618
CLASS="LITERAL"
619
>CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
620
>:</P
621
><P
622
></P
623
><UL
624
><LI
625
><P
626
>When create and delete functions
627
<TT
628
CLASS="FUNCTION"
629
>cre_xxx()</TT
630
>
631
 and
632
<TT
633
CLASS="FUNCTION"
634
>del_xxx()</TT
635
>
636
 are supported, all calls which use a valid object ID number check
637
that the object exists. If not, E_NOEXS is returned.</P
638
></LI
639
><LI
640
><P
641
>When create functions
642
<TT
643
CLASS="FUNCTION"
644
>cre_xxx()</TT
645
>
646
 are supported, if the object already exists, then E_OBJ</P
647
></LI
648
><LI
649
><P
650
>In any call which can sleep, such as
651
<TT
652
CLASS="FUNCTION"
653
>get_blk()</TT
654
>
655
: return codes E_TMOUT, E_RLWAI, E_DLT
656
or of course E_OK are returned depending on the reason
657
for terminating the sleep</P
658
></LI
659
><LI
660
><P
661
>In polling functions such as
662
<TT
663
CLASS="FUNCTION"
664
>pget_blk()</TT
665
>
666
return codes E_TMOUT or E_OK are returned depending
667
on the state of the synchronization object</P
668
></LI
669
><LI
670
><P
671
>In creation functions, the attributes must be compatible
672
with the selected underlying kernel configuration: in
673
<TT
674
CLASS="FUNCTION"
675
>cre_mpl()</TT
676
>
677
 
678
<TT
679
CLASS="LITERAL"
680
>pk_cmpl-&gt;mplatr</TT
681
>
682
 must be equal to
683
<TT
684
CLASS="LITERAL"
685
>TA_TFIFO</TT
686
>
687
 else E_RSATR.</P
688
></LI
689
><LI
690
><P
691
>In
692
<TT
693
CLASS="FUNCTION"
694
>cre_mpf()</TT
695
>
696
 
697
<TT
698
CLASS="LITERAL"
699
>pk_cmpf-&gt;mpfatr</TT
700
>
701
 must be equal to
702
<TT
703
CLASS="LITERAL"
704
>TA_TFIFO</TT
705
>
706
 else E_RSATR.</P
707
></LI
708
><LI
709
><P
710
>In creation functions, the requested size of the memory
711
pool must not be larger than that statically configured for the
712
pool else E_RSATR; see the configuration option
713
&#8220;Option: Static initializers&#8221;.
714
 In
715
<TT
716
CLASS="FUNCTION"
717
>cre_mpl()</TT
718
>
719
 
720
<TT
721
CLASS="LITERAL"
722
>pk_cmpl-&gt;mplsz</TT
723
>
724
 is the field of interest</P
725
></LI
726
><LI
727
><P
728
>In
729
<TT
730
CLASS="FUNCTION"
731
>cre_mpf()</TT
732
>
733
 the product of
734
<TT
735
CLASS="LITERAL"
736
>pk_cmpf-&gt;blfsz</TT
737
>
738
 and
739
<TT
740
CLASS="LITERAL"
741
>pk_cmpf-&gt;mpfcnt</TT
742
>
743
 must be smaller than the memory statically configured for the pool
744
else E_RSATR</P
745
></LI
746
><LI
747
><P
748
>In functions which return memory to the pool
749
<TT
750
CLASS="FUNCTION"
751
>rel_blk()</TT
752
>
753
 and
754
<TT
755
CLASS="FUNCTION"
756
>rel_blf()</TT
757
>
758
, if the free fails, for example because the memory did not come
759
from that pool originally, then E_PAR is returned</P
760
></LI
761
></UL
762
></DIV
763
></DIV
764
><DIV
765
CLASS="NAVFOOTER"
766
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767
ALIGN="LEFT"
768
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769
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770
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771
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777
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778
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779
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780
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781
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782
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784
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785
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786
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787
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788
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789
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790
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795
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799
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801
></TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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>Interrupt management functions</TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="compat-uitron-microitron-api.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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WIDTH="33%"
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ALIGN="right"
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>Time Management Functions</TD
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