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<!-- Copyright (C) 2003 Red Hat, Inc.                                -->
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<!-- This material may be distributed only subject to the terms      -->
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<!-- and conditions set forth in the Open Publication License, v1.0  -->
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<!-- or later (the latest version is presently available at          -->
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<HTML
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><HEAD
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><TITLE
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>         Synchronization and Communication Functions</TITLE
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><meta name="MSSmartTagsPreventParsing" content="TRUE">
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<META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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"><LINK
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REL="HOME"
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TITLE="eCos Reference Manual"
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HREF="ecos-ref.html"><LINK
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REL="UP"
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TITLE="µITRON API"
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HREF="compat-uitron-microitron-api.html"><LINK
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REL="PREVIOUS"
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TITLE="Task-Dependent Synchronization Functions"
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HREF="compat-uitron-task-dependent-synch-functions.html"><LINK
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REL="NEXT"
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TITLE="Extended Synchronization and Communication Functions"
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HREF="compat-uitron-extended-sync-comm-functions.html"></HEAD
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><BODY
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CLASS="SECT1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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VLINK="#840084"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>eCos Reference Manual</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="compat-uitron-task-dependent-synch-functions.html"
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ACCESSKEY="P"
59 
>Prev</A
60 
></TD
61 
><TD
62 
WIDTH="80%"
63 
ALIGN="center"
64 
VALIGN="bottom"
65 
>Chapter 32. &micro;ITRON API</TD
66 
><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="compat-uitron-extended-sync-comm-functions.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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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-SYNC-AND-COMM-FUNCTIONS">Synchronization and Communication Functions</H1
86 
><P
87 
>These functions are fully supported in this release: </P
88 
><TABLE
89 
BORDER="5"
90 
BGCOLOR="#E0E0F0"
91 
WIDTH="70%"
92 
><TR
93 
><TD
94 
><PRE
95 
CLASS="PROGRAMLISTING"
96 
>ER <TT
97 
CLASS="FUNCTION"
98 
>sig_sem</TT
99 
>(
100 
    ID <SPAN
101 
CLASS="emphasis"
102 
><I
103 
CLASS="EMPHASIS"
104 
>semid</I
105 
></SPAN
106 
> )</PRE
107 
></TD
108 
></TR
109 
></TABLE
110 
><TABLE
111 
BORDER="5"
112 
BGCOLOR="#E0E0F0"
113 
WIDTH="70%"
114 
><TR
115 
><TD
116 
><PRE
117 
CLASS="PROGRAMLISTING"
118 
>ER <TT
119 
CLASS="FUNCTION"
120 
>wai_sem</TT
121 
>(
122 
    ID <SPAN
123 
CLASS="emphasis"
124 
><I
125 
CLASS="EMPHASIS"
126 
>semid</I
127 
></SPAN
128 
> )</PRE
129 
></TD
130 
></TR
131 
></TABLE
132 
><TABLE
133 
BORDER="5"
134 
BGCOLOR="#E0E0F0"
135 
WIDTH="70%"
136 
><TR
137 
><TD
138 
><PRE
139 
CLASS="PROGRAMLISTING"
140 
>ER <TT
141 
CLASS="FUNCTION"
142 
>preq_sem</TT
143 
>(
144 
    ID <SPAN
145 
CLASS="emphasis"
146 
><I
147 
CLASS="EMPHASIS"
148 
>semid</I
149 
></SPAN
150 
> )</PRE
151 
></TD
152 
></TR
153 
></TABLE
154 
><TABLE
155 
BORDER="5"
156 
BGCOLOR="#E0E0F0"
157 
WIDTH="70%"
158 
><TR
159 
><TD
160 
><PRE
161 
CLASS="PROGRAMLISTING"
162 
>ER <TT
163 
CLASS="FUNCTION"
164 
>twai_sem</TT
165 
>(
166 
    ID <SPAN
167 
CLASS="emphasis"
168 
><I
169 
CLASS="EMPHASIS"
170 
>semid,</I
171 
></SPAN
172 
>    TMO <SPAN
173 
CLASS="emphasis"
174 
><I
175 
CLASS="EMPHASIS"
176 
>tmout</I
177 
></SPAN
178 
> )</PRE
179 
></TD
180 
></TR
181 
></TABLE
182 
><TABLE
183 
BORDER="5"
184 
BGCOLOR="#E0E0F0"
185 
WIDTH="70%"
186 
><TR
187 
><TD
188 
><PRE
189 
CLASS="PROGRAMLISTING"
190 
>ER <TT
191 
CLASS="FUNCTION"
192 
>ref_sem</TT
193 
>(
194 
    T_RSEM *<SPAN
195 
CLASS="emphasis"
196 
><I
197 
CLASS="EMPHASIS"
198 
>pk_rsem ,</I
199 
></SPAN
200 
>    ID <SPAN
201 
CLASS="emphasis"
202 
><I
203 
CLASS="EMPHASIS"
204 
>semid</I
205 
></SPAN
206 
> )</PRE
207 
></TD
208 
></TR
209 
></TABLE
210 
><TABLE
211 
BORDER="5"
212 
BGCOLOR="#E0E0F0"
213 
WIDTH="70%"
214 
><TR
215 
><TD
216 
><PRE
217 
CLASS="PROGRAMLISTING"
218 
>ER <TT
219 
CLASS="FUNCTION"
220 
>set_flg</TT
221 
>(
222 
    ID <SPAN
223 
CLASS="emphasis"
224 
><I
225 
CLASS="EMPHASIS"
226 
>flgid,</I
227 
></SPAN
228 
>    UINT <SPAN
229 
CLASS="emphasis"
230 
><I
231 
CLASS="EMPHASIS"
232 
>setptn</I
233 
></SPAN
234 
> )</PRE
235 
></TD
236 
></TR
237 
></TABLE
238 
><TABLE
239 
BORDER="5"
240 
BGCOLOR="#E0E0F0"
241 
WIDTH="70%"
242 
><TR
243 
><TD
244 
><PRE
245 
CLASS="PROGRAMLISTING"
246 
>ER <TT
247 
CLASS="FUNCTION"
248 
>clr_flg</TT
249 
>(
250 
    ID <SPAN
251 
CLASS="emphasis"
252 
><I
253 
CLASS="EMPHASIS"
254 
>flgid,</I
255 
></SPAN
256 
>    UINT <SPAN
257 
CLASS="emphasis"
258 
><I
259 
CLASS="EMPHASIS"
260 
>clrptn</I
261 
></SPAN
262 
> )</PRE
263 
></TD
264 
></TR
265 
></TABLE
266 
><TABLE
267 
BORDER="5"
268 
BGCOLOR="#E0E0F0"
269 
WIDTH="70%"
270 
><TR
271 
><TD
272 
><PRE
273 
CLASS="PROGRAMLISTING"
274 
>ER <TT
275 
CLASS="FUNCTION"
276 
>wai_flg</TT
277 
>(
278 
    UINT *<SPAN
279 
CLASS="emphasis"
280 
><I
281 
CLASS="EMPHASIS"
282 
>p_flgptn,</I
283 
></SPAN
284 
>    ID <SPAN
285 
CLASS="emphasis"
286 
><I
287 
CLASS="EMPHASIS"
288 
>flgid ,</I
289 
></SPAN
290 
>
291 
    UINT <SPAN
292 
CLASS="emphasis"
293 
><I
294 
CLASS="EMPHASIS"
295 
>waiptn ,</I
296 
></SPAN
297 
>    UINT <SPAN
298 
CLASS="emphasis"
299 
><I
300 
CLASS="EMPHASIS"
301 
>wfmode</I
302 
></SPAN
303 
> )</PRE
304 
></TD
305 
></TR
306 
></TABLE
307 
><TABLE
308 
BORDER="5"
309 
BGCOLOR="#E0E0F0"
310 
WIDTH="70%"
311 
><TR
312 
><TD
313 
><PRE
314 
CLASS="PROGRAMLISTING"
315 
>ER <TT
316 
CLASS="FUNCTION"
317 
>pol_flg</TT
318 
>(
319 
    UINT *<SPAN
320 
CLASS="emphasis"
321 
><I
322 
CLASS="EMPHASIS"
323 
>p_flgptn,</I
324 
></SPAN
325 
>    ID <SPAN
326 
CLASS="emphasis"
327 
><I
328 
CLASS="EMPHASIS"
329 
>flgid ,</I
330 
></SPAN
331 
>
332 
    UINT <SPAN
333 
CLASS="emphasis"
334 
><I
335 
CLASS="EMPHASIS"
336 
>waiptn ,</I
337 
></SPAN
338 
>    UINT <SPAN
339 
CLASS="emphasis"
340 
><I
341 
CLASS="EMPHASIS"
342 
>wfmode</I
343 
></SPAN
344 
> )</PRE
345 
></TD
346 
></TR
347 
></TABLE
348 
><TABLE
349 
BORDER="5"
350 
BGCOLOR="#E0E0F0"
351 
WIDTH="70%"
352 
><TR
353 
><TD
354 
><PRE
355 
CLASS="PROGRAMLISTING"
356 
>ER <TT
357 
CLASS="FUNCTION"
358 
>twai_flg</TT
359 
>(
360 
    UINT *<SPAN
361 
CLASS="emphasis"
362 
><I
363 
CLASS="EMPHASIS"
364 
>p_flgptn</I
365 
></SPAN
366 
>    ID <SPAN
367 
CLASS="emphasis"
368 
><I
369 
CLASS="EMPHASIS"
370 
>flgid ,</I
371 
></SPAN
372 
>
373 
    UINT <SPAN
374 
CLASS="emphasis"
375 
><I
376 
CLASS="EMPHASIS"
377 
>waiptn ,</I
378 
></SPAN
379 
>    UINT <SPAN
380 
CLASS="emphasis"
381 
><I
382 
CLASS="EMPHASIS"
383 
>wfmode,</I
384 
></SPAN
385 
>    TMO <SPAN
386 
CLASS="emphasis"
387 
><I
388 
CLASS="EMPHASIS"
389 
>tmout</I
390 
></SPAN
391 
> )</PRE
392 
></TD
393 
></TR
394 
></TABLE
395 
><TABLE
396 
BORDER="5"
397 
BGCOLOR="#E0E0F0"
398 
WIDTH="70%"
399 
><TR
400 
><TD
401 
><PRE
402 
CLASS="PROGRAMLISTING"
403 
>ER <TT
404 
CLASS="FUNCTION"
405 
>ref_flg</TT
406 
>(
407 
    T_RFLG *<SPAN
408 
CLASS="emphasis"
409 
><I
410 
CLASS="EMPHASIS"
411 
>pk_rflg,</I
412 
></SPAN
413 
>    ID <SPAN
414 
CLASS="emphasis"
415 
><I
416 
CLASS="EMPHASIS"
417 
>flgid</I
418 
></SPAN
419 
> )</PRE
420 
></TD
421 
></TR
422 
></TABLE
423 
><TABLE
424 
BORDER="5"
425 
BGCOLOR="#E0E0F0"
426 
WIDTH="70%"
427 
><TR
428 
><TD
429 
><PRE
430 
CLASS="PROGRAMLISTING"
431 
>ER <TT
432 
CLASS="FUNCTION"
433 
>snd_msg</TT
434 
>(
435 
    ID <SPAN
436 
CLASS="emphasis"
437 
><I
438 
CLASS="EMPHASIS"
439 
>mbxid,</I
440 
></SPAN
441 
>    T_MSG <SPAN
442 
CLASS="emphasis"
443 
><I
444 
CLASS="EMPHASIS"
445 
>*pk_msg</I
446 
></SPAN
447 
> )</PRE
448 
></TD
449 
></TR
450 
></TABLE
451 
><TABLE
452 
BORDER="5"
453 
BGCOLOR="#E0E0F0"
454 
WIDTH="70%"
455 
><TR
456 
><TD
457 
><PRE
458 
CLASS="PROGRAMLISTING"
459 
>ER <TT
460 
CLASS="FUNCTION"
461 
>rcv_msg</TT
462 
>(
463 
    T_MSG **<SPAN
464 
CLASS="emphasis"
465 
><I
466 
CLASS="EMPHASIS"
467 
>ppk_msg,</I
468 
></SPAN
469 
>    ID <SPAN
470 
CLASS="emphasis"
471 
><I
472 
CLASS="EMPHASIS"
473 
>mbxid</I
474 
></SPAN
475 
> )</PRE
476 
></TD
477 
></TR
478 
></TABLE
479 
><TABLE
480 
BORDER="5"
481 
BGCOLOR="#E0E0F0"
482 
WIDTH="70%"
483 
><TR
484 
><TD
485 
><PRE
486 
CLASS="PROGRAMLISTING"
487 
>ER <TT
488 
CLASS="FUNCTION"
489 
>prcv_msg</TT
490 
>(
491 
    T_MSG **<SPAN
492 
CLASS="emphasis"
493 
><I
494 
CLASS="EMPHASIS"
495 
>ppk_msg,</I
496 
></SPAN
497 
>    ID <SPAN
498 
CLASS="emphasis"
499 
><I
500 
CLASS="EMPHASIS"
501 
>mbxid</I
502 
></SPAN
503 
> )</PRE
504 
></TD
505 
></TR
506 
></TABLE
507 
><TABLE
508 
BORDER="5"
509 
BGCOLOR="#E0E0F0"
510 
WIDTH="70%"
511 
><TR
512 
><TD
513 
><PRE
514 
CLASS="PROGRAMLISTING"
515 
>ER <TT
516 
CLASS="FUNCTION"
517 
>trcv_msg</TT
518 
>(
519 
    T_MSG **<SPAN
520 
CLASS="emphasis"
521 
><I
522 
CLASS="EMPHASIS"
523 
>ppk_msg,</I
524 
></SPAN
525 
>    ID <SPAN
526 
CLASS="emphasis"
527 
><I
528 
CLASS="EMPHASIS"
529 
>mbxid ,</I
530 
></SPAN
531 
>    TMO <SPAN
532 
CLASS="emphasis"
533 
><I
534 
CLASS="EMPHASIS"
535 
>tmout</I
536 
></SPAN
537 
> )</PRE
538 
></TD
539 
></TR
540 
></TABLE
541 
><TABLE
542 
BORDER="5"
543 
BGCOLOR="#E0E0F0"
544 
WIDTH="70%"
545 
><TR
546 
><TD
547 
><PRE
548 
CLASS="PROGRAMLISTING"
549 
>ER <TT
550 
CLASS="FUNCTION"
551 
>ref_mbx</TT
552 
>(
553 
    T_RMBX *<SPAN
554 
CLASS="emphasis"
555 
><I
556 
CLASS="EMPHASIS"
557 
>pk_rmbx,</I
558 
></SPAN
559 
>    ID <SPAN
560 
CLASS="emphasis"
561 
><I
562 
CLASS="EMPHASIS"
563 
>mbxid</I
564 
></SPAN
565 
> )</PRE
566 
></TD
567 
></TR
568 
></TABLE
569 
><P
570 
>The following functions are supported in this release (with
571 
some restrictions) if enabled with the appropriate configuration
572 
option for the object type (for example
573 
<TT
574 
CLASS="LITERAL"
575 
>CYGPKG_UITRON_SEMAS_CREATE_DELETE</TT
576 
>):</P
577 
><TABLE
578 
BORDER="5"
579 
BGCOLOR="#E0E0F0"
580 
WIDTH="70%"
581 
><TR
582 
><TD
583 
><PRE
584 
CLASS="PROGRAMLISTING"
585 
>ER <TT
586 
CLASS="FUNCTION"
587 
>cre_sem</TT
588 
>(
589 
    ID <SPAN
590 
CLASS="emphasis"
591 
><I
592 
CLASS="EMPHASIS"
593 
>semid,</I
594 
></SPAN
595 
>    T_CSEM *<SPAN
596 
CLASS="emphasis"
597 
><I
598 
CLASS="EMPHASIS"
599 
>pk_csem</I
600 
></SPAN
601 
> )</PRE
602 
></TD
603 
></TR
604 
></TABLE
605 
><TABLE
606 
BORDER="5"
607 
BGCOLOR="#E0E0F0"
608 
WIDTH="70%"
609 
><TR
610 
><TD
611 
><PRE
612 
CLASS="PROGRAMLISTING"
613 
>ER <TT
614 
CLASS="FUNCTION"
615 
>del_sem</TT
616 
>(
617 
    ID <SPAN
618 
CLASS="emphasis"
619 
><I
620 
CLASS="EMPHASIS"
621 
>semid</I
622 
></SPAN
623 
> )</PRE
624 
></TD
625 
></TR
626 
></TABLE
627 
><TABLE
628 
BORDER="5"
629 
BGCOLOR="#E0E0F0"
630 
WIDTH="70%"
631 
><TR
632 
><TD
633 
><PRE
634 
CLASS="PROGRAMLISTING"
635 
>ER <TT
636 
CLASS="FUNCTION"
637 
>cre_flg</TT
638 
>(
639 
    ID <SPAN
640 
CLASS="emphasis"
641 
><I
642 
CLASS="EMPHASIS"
643 
>flgid,</I
644 
></SPAN
645 
>    T_CFLG *<SPAN
646 
CLASS="emphasis"
647 
><I
648 
CLASS="EMPHASIS"
649 
>pk_cflg</I
650 
></SPAN
651 
> )</PRE
652 
></TD
653 
></TR
654 
></TABLE
655 
><TABLE
656 
BORDER="5"
657 
BGCOLOR="#E0E0F0"
658 
WIDTH="70%"
659 
><TR
660 
><TD
661 
><PRE
662 
CLASS="PROGRAMLISTING"
663 
>ER <TT
664 
CLASS="FUNCTION"
665 
>del_flg</TT
666 
>(
667 
    ID <SPAN
668 
CLASS="emphasis"
669 
><I
670 
CLASS="EMPHASIS"
671 
>flgid</I
672 
></SPAN
673 
> )</PRE
674 
></TD
675 
></TR
676 
></TABLE
677 
><TABLE
678 
BORDER="5"
679 
BGCOLOR="#E0E0F0"
680 
WIDTH="70%"
681 
><TR
682 
><TD
683 
><PRE
684 
CLASS="PROGRAMLISTING"
685 
>ER <TT
686 
CLASS="FUNCTION"
687 
>cre_mbx</TT
688 
>(
689 
    ID <SPAN
690 
CLASS="emphasis"
691 
><I
692 
CLASS="EMPHASIS"
693 
>mbxid,</I
694 
></SPAN
695 
>    T_CMBX *<SPAN
696 
CLASS="emphasis"
697 
><I
698 
CLASS="EMPHASIS"
699 
>pk_cmbx</I
700 
></SPAN
701 
> )</PRE
702 
></TD
703 
></TR
704 
></TABLE
705 
><TABLE
706 
BORDER="5"
707 
BGCOLOR="#E0E0F0"
708 
WIDTH="70%"
709 
><TR
710 
><TD
711 
><PRE
712 
CLASS="PROGRAMLISTING"
713 
>ER <TT
714 
CLASS="FUNCTION"
715 
>del_mbx</TT
716 
>(
717 
    ID <SPAN
718 
CLASS="emphasis"
719 
><I
720 
CLASS="EMPHASIS"
721 
>mbxid</I
722 
></SPAN
723 
> )</PRE
724 
></TD
725 
></TR
726 
></TABLE
727 
><P
728 
>In general the queueing order when waiting on a synchronization
729 
object depends on the underlying kernel configuration. The multi-level
730 
queue scheduler is required for strict &micro;ITRON
731 
conformance and it queues tasks in FIFO order, so requests to create
732 
an object with priority queueing of tasks (<TT
733 
CLASS="LITERAL"
734 
>pk_cxxx-&gt;xxxatr = TA_TPRI</TT
735 
>)
736 
are rejected with E_RSATR. Additional undefined bits in
737 
the attributes fields must be zero. </P
738 
><P
739 
>In general, extended information (pk_cxxx-&gt;exinf)
740 
is ignored. </P
741 
><P
742 
>For semaphores, the initial semaphore count (pk_csem-&gt;isemcnt)
743 
is supported; the new semaphore's count is set. The maximum
744 
count is not supported, and is not in fact defined in type pk_csem. </P
745 
><P
746 
>For flags, multiple tasks are allowed to wait. Because single
747 
task waiting is a subset of this, the W bit (TA_WMUL) of
748 
the flag attributes is ignored; all other bits must be zero. The
749 
initial flag value is supported. </P
750 
><P
751 
>For mailboxes, the buffer count is defined statically by kernel
752 
configuration option
753 
<TT
754 
CLASS="LITERAL"
755 
>CYGNUM_KERNEL_SYNCH_MBOX_QUEUE_SIZE</TT
756 
>;
757 
therefore the buffer count field is not supported and is not in
758 
fact defined in type pk_cmbx. Queueing of messages is FIFO
759 
ordered only, so TA_MPRI (in pk_cmbx-&gt;mbxatr)
760 
is not supported. </P
761 
><DIV
762 
CLASS="SECT2"
763 
><H2
764 
CLASS="SECT2"
765 
><A
766 
NAME="AEN13716">Error checking</H2
767 
><P
768 
>The following conditions are only checked for, and only return
769 
errors if
770 
<TT
771 
CLASS="LITERAL"
772 
>CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
773 
>
774 
is enabled:</P
775 
><P
776 
></P
777 
><UL
778 
><LI
779 
><P
780 
>invalid object id; less than 1 or greater than
781 
<TT
782 
CLASS="LITERAL"
783 
>CYGNUM_UITRON_TASKS/SEMAS/MBOXES</TT
784 
>
785 
as appropriate returns E_ID</P
786 
></LI
787 
><LI
788 
><P
789 
>dispatching is enabled in any call which can sleep, or
790 
E_CTX</P
791 
></LI
792 
><LI
793 
><P
794 
>tmout must be positive, otherwise E_PAR</P
795 
></LI
796 
><LI
797 
><P
798 
>pk_cxxx pointers in
799 
<TT
800 
CLASS="FUNCTION"
801 
>cre_xxx()</TT
802 
>
803 
 must be valid pointers, or E_PAR</P
804 
></LI
805 
><LI
806 
><P
807 
>return value pointer in
808 
<TT
809 
CLASS="FUNCTION"
810 
>ref_xxx()</TT
811 
>
812 
 is valid pointer, or E_PAR</P
813 
></LI
814 
><LI
815 
><P
816 
>flag wait pattern must be non-zero, and mode must be valid,
817 
or E_PAR</P
818 
></LI
819 
><LI
820 
><P
821 
>return value pointer in flag wait calls is a valid pointer,
822 
or E_PAR</P
823 
></LI
824 
></UL
825 
><P
826 
>The following conditions are checked for, and can return error
827 
codes, regardless of the setting of
828 
<TT
829 
CLASS="LITERAL"
830 
>CYGSEM_UITRON_BAD_PARAMS_RETURN_ERRORS</TT
831 
>
832 
:</P
833 
><P
834 
></P
835 
><UL
836 
><LI
837 
><P
838 
>When create and delete functions
839 
<TT
840 
CLASS="FUNCTION"
841 
>cre_xxx()</TT
842 
>
843 
 and
844 
<TT
845 
CLASS="FUNCTION"
846 
>del_xxx()</TT
847 
>
848 
 are supported, all calls which use a valid object ID number check
849 
that the object exists. If not, E_NOEXS is returned.</P
850 
></LI
851 
><LI
852 
><P
853 
>In create functions
854 
<TT
855 
CLASS="FUNCTION"
856 
>cre_xxx()</TT
857 
>
858 
, when supported, if the object already exists, then E_OBJ</P
859 
></LI
860 
><LI
861 
><P
862 
>In any call which can sleep, such as
863 
<TT
864 
CLASS="FUNCTION"
865 
>twai_sem()</TT
866 
>
867 
: return codes E_TMOUT, E_RLWAI, E_DLT
868 
or of course E_OK are returned depending on the reason
869 
for terminating the sleep</P
870 
></LI
871 
><LI
872 
><P
873 
>In polling functions such as
874 
<TT
875 
CLASS="FUNCTION"
876 
>preq_sem()</TT
877 
>
878 
return codes E_TMOUT or E_OK are returned depending
879 
on the state of the synchronization object</P
880 
></LI
881 
><LI
882 
><P
883 
>In creation functions, the attributes must be compatible
884 
with the selected underlying kernel configuration: in
885 
<TT
886 
CLASS="FUNCTION"
887 
>cre_sem()</TT
888 
>
889 
 <TT
890 
CLASS="LITERAL"
891 
>pk_csem-&gt;sematr</TT
892 
>
893 
 must be equal to
894 
<TT
895 
CLASS="LITERAL"
896 
>TA_TFIFO</TT
897 
>
898 
 else E_RSATR.</P
899 
></LI
900 
><LI
901 
><P
902 
>In
903 
<TT
904 
CLASS="FUNCTION"
905 
>cre_flg()</TT
906 
>
907 
 <TT
908 
CLASS="LITERAL"
909 
>pk_cflg-&gt;flgatr</TT
910 
>
911 
 must be either
912 
<TT
913 
CLASS="VARNAME"
914 
>TA_WMUL</TT
915 
>
916 
 or
917 
<TT
918 
CLASS="VARNAME"
919 
>TA_WSGL</TT
920 
>
921 
 else <TT
922 
CLASS="VARNAME"
923 
>E_RSATR</TT
924 
>.</P
925 
></LI
926 
><LI
927 
><P
928 
>In
929 
<TT
930 
CLASS="FUNCTION"
931 
>cre_mbx()</TT
932 
>
933 
 
934 
<TT
935 
CLASS="LITERAL"
936 
>pk_cmbx-&gt;mbxatr</TT
937 
>
938 
 must be
939 
<TT
940 
CLASS="LITERAL"
941 
>TA_TFIFO &#0043; TA_MFIFO</TT
942 
>
943 
 else E_RSATR.</P
944 
></LI
945 
></UL
946 
></DIV
947 
></DIV
948 
><DIV
949 
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950 
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951 
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953 
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959 
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960 
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961 
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962 
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963 
><A
964 
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965 
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966 
>Prev</A
967 
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968 
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969 
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974 
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975 
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984 
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985 
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986 
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987 
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990 
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992 
>Task-Dependent Synchronization Functions</TD
993 
><TD
994 
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995 
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996 
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997 
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998 
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1000 
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1001 
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1002 
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1003 
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1007 
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