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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<HTML
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>         Memory pool Management Functions</TITLE
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>eCos Reference Manual</TH
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><A
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>Chapter 32. &micro;ITRON API</TD
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CLASS="SECT1"
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><H1
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CLASS="SECT1"
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><A
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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
97 
CLASS="FUNCTION"
98 
>get_blf</TT
99 
>(
100 
    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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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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>pget_blf</TT
127 
>(
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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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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
151 
CLASS="PROGRAMLISTING"
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>ER <TT
153 
CLASS="FUNCTION"
154 
>tget_blf</TT
155 
>(
156 
    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
171 
CLASS="EMPHASIS"
172 
>tmout</I
173 
></SPAN
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> )</PRE
175 
></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
185 
CLASS="PROGRAMLISTING"
186 
>ER <TT
187 
CLASS="FUNCTION"
188 
>rel_blf</TT
189 
>(
190 
    ID <SPAN
191 
CLASS="emphasis"
192 
><I
193 
CLASS="EMPHASIS"
194 
>mpfid,</I
195 
></SPAN
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>    VP <SPAN
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CLASS="emphasis"
198 
><I
199 
CLASS="EMPHASIS"
200 
>blf</I
201 
></SPAN
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> )</PRE
203 
></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
212 
><PRE
213 
CLASS="PROGRAMLISTING"
214 
>ER <TT
215 
CLASS="FUNCTION"
216 
>ref_mpf</TT
217 
>(
218 
    T_RMPF *<SPAN
219 
CLASS="emphasis"
220 
><I
221 
CLASS="EMPHASIS"
222 
>pk_rmpf,</I
223 
></SPAN
224 
>    ID <SPAN
225 
CLASS="emphasis"
226 
><I
227 
CLASS="EMPHASIS"
228 
>mpfid</I
229 
></SPAN
230 
> )</PRE
231 
></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
241 
CLASS="PROGRAMLISTING"
242 
>ER <TT
243 
CLASS="FUNCTION"
244 
>get_blk</TT
245 
>(
246 
    VP *<SPAN
247 
CLASS="emphasis"
248 
><I
249 
CLASS="EMPHASIS"
250 
>p_blk,</I
251 
></SPAN
252 
>    ID <SPAN
253 
CLASS="emphasis"
254 
><I
255 
CLASS="EMPHASIS"
256 
>mplid,</I
257 
></SPAN
258 
>    INT <SPAN
259 
CLASS="emphasis"
260 
><I
261 
CLASS="EMPHASIS"
262 
>blksz</I
263 
></SPAN
264 
> )</PRE
265 
></TD
266 
></TR
267 
></TABLE
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><TABLE
269 
BORDER="5"
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BGCOLOR="#E0E0F0"
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WIDTH="70%"
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><TR
273 
><TD
274 
><PRE
275 
CLASS="PROGRAMLISTING"
276 
>ER <TT
277 
CLASS="FUNCTION"
278 
>pget_blk</TT
279 
>(
280 
    VP *<SPAN
281 
CLASS="emphasis"
282 
><I
283 
CLASS="EMPHASIS"
284 
>p_blk,</I
285 
></SPAN
286 
>    ID <SPAN
287 
CLASS="emphasis"
288 
><I
289 
CLASS="EMPHASIS"
290 
>mplid,</I
291 
></SPAN
292 
>    INT <SPAN
293 
CLASS="emphasis"
294 
><I
295 
CLASS="EMPHASIS"
296 
>blksz</I
297 
></SPAN
298 
> )</PRE
299 
></TD
300 
></TR
301 
></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
307 
><TD
308 
><PRE
309 
CLASS="PROGRAMLISTING"
310 
>ER <TT
311 
CLASS="FUNCTION"
312 
>tget_blk</TT
313 
>(
314 
    VP *<SPAN
315 
CLASS="emphasis"
316 
><I
317 
CLASS="EMPHASIS"
318 
>p_blk,</I
319 
></SPAN
320 
>    ID <SPAN
321 
CLASS="emphasis"
322 
><I
323 
CLASS="EMPHASIS"
324 
>mplid,</I
325 
></SPAN
326 
>    INT <SPAN
327 
CLASS="emphasis"
328 
><I
329 
CLASS="EMPHASIS"
330 
>blksz,</I
331 
></SPAN
332 
>    TMO <SPAN
333 
CLASS="emphasis"
334 
><I
335 
CLASS="EMPHASIS"
336 
>tmout</I
337 
></SPAN
338 
> )</PRE
339 
></TD
340 
></TR
341 
></TABLE
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><TABLE
343 
BORDER="5"
344 
BGCOLOR="#E0E0F0"
345 
WIDTH="70%"
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><TR
347 
><TD
348 
><PRE
349 
CLASS="PROGRAMLISTING"
350 
>ER <TT
351 
CLASS="FUNCTION"
352 
>rel_blk</TT
353 
>(
354 
    ID <SPAN
355 
CLASS="emphasis"
356 
><I
357 
CLASS="EMPHASIS"
358 
>mplid,</I
359 
></SPAN
360 
>    VP <SPAN
361 
CLASS="emphasis"
362 
><I
363 
CLASS="EMPHASIS"
364 
>blk</I
365 
></SPAN
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> )</PRE
367 
></TD
368 
></TR
369 
></TABLE
370 
><TABLE
371 
BORDER="5"
372 
BGCOLOR="#E0E0F0"
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WIDTH="70%"
374 
><TR
375 
><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
388 
>    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%"
421 
><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 
><HR
767 
ALIGN="LEFT"
768 
WIDTH="100%"><TABLE
769 
SUMMARY="Footer navigation table"
770 
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771 
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777 
ALIGN="left"
778 
VALIGN="top"
779 
><A
780 
HREF="compat-uitron-interrupt-management-functions.html"
781 
ACCESSKEY="P"
782 
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783 
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784 
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785 
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786 
ALIGN="center"
787 
VALIGN="top"
788 
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789 
HREF="ecos-ref.html"
790 
ACCESSKEY="H"
791 
>Home</A
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795 
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796 
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798 
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799 
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800 
>Next</A
801 
></TD
802 
></TR
803 
><TR
804 
><TD
805 
WIDTH="33%"
806 
ALIGN="left"
807 
VALIGN="top"
808 
>Interrupt management functions</TD
809 
><TD
810 
WIDTH="34%"
811 
ALIGN="center"
812 
VALIGN="top"
813 
><A
814 
HREF="compat-uitron-microitron-api.html"
815 
ACCESSKEY="U"
816 
>Up</A
817 
></TD
818 
><TD
819 
WIDTH="33%"
820 
ALIGN="right"
821 
VALIGN="top"
822 
>Time Management Functions</TD
823 
></TR
824 
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825 
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826 
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827 
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828 
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