1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<title>Mail Queue</title>
<title>CMSIS-RTOS: Mail Queue</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<link href="cmsis.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<script type="text/javascript" src="printComponentTabs.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
$(document).ready(initResizable);
</script>
<link href="stylsheetf" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 46px;">
<td id="projectlogo"><img alt="Logo" src="CMSIS_Logo_Final.png"/></td>
<td style="padding-left: 0.5em;">
<div id="projectname">CMSIS-RTOS
 <span id="projectnumber">Version 1.02</span>
</div>
<div id="projectbrief">CMSIS-RTOS API: Generic RTOS interface for Cortex-M processor-based devices.</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<div id="CMSISnav" class="tabs1">
<ul class="tablist">
<script type="text/javascript">
<!--
writeComponentTabs.call(this);
//-->
</script>
</ul>
</div>
<!-- Generated by Doxygen 1.8.2 -->
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="index.html"><span>Main Page</span></a></li>
<li><a href="pages.html"><span>Usage and Description</span></a></li>
<li><a href="modules.html"><span>Reference</span></a></li>
</ul>
</div>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
<div id="nav-sync" class="sync"></div>
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('group___c_m_s_i_s___r_t_o_s___mail.html','');});
</script>
<div id="doc-content">
<div class="header">
<div class="summary">
<a href="#define-members">Macros</a> |
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Mail Queue</div> </div>
<div class="ingroups"><a class="el" href="group___c_m_s_i_s___r_t_o_s___inter_thread.html">Inter-Thread Communication and Resource Sharing</a></div></div><!--header-->
<div class="contents">
<p>Exchange data between threads using a queue of memory blocks.
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="define-members"></a>
Macros</h2></td></tr>
<tr class="memitem:gaceb2e0071ce160d153047f2eac1aca8e"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaceb2e0071ce160d153047f2eac1aca8e">osFeature_MailQ</a>   1</td></tr>
<tr class="memdesc:gaceb2e0071ce160d153047f2eac1aca8e"><td class="mdescLeft"> </td><td class="mdescRight">Mail Queues: 1=available, 0=not available. <a href="#gaceb2e0071ce160d153047f2eac1aca8e"></a><br/></td></tr>
<tr class="separator:gaceb2e0071ce160d153047f2eac1aca8e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga58d712b16c0c6668059f509386d1e55b"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga58d712b16c0c6668059f509386d1e55b">osMailQDef</a>(name, queue_sz, type)</td></tr>
<tr class="memdesc:ga58d712b16c0c6668059f509386d1e55b"><td class="mdescLeft"> </td><td class="mdescRight">Create a Mail Queue Definition. <a href="#ga58d712b16c0c6668059f509386d1e55b"></a><br/></td></tr>
<tr class="separator:ga58d712b16c0c6668059f509386d1e55b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad2deeb66d51ade54e63d8f87ff2ec9d2"><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gad2deeb66d51ade54e63d8f87ff2ec9d2">osMailQ</a>(name)   &os_mailQ_def_##name</td></tr>
<tr class="memdesc:gad2deeb66d51ade54e63d8f87ff2ec9d2"><td class="mdescLeft"> </td><td class="mdescRight">Access a Mail Queue Definition. <a href="#gad2deeb66d51ade54e63d8f87ff2ec9d2"></a><br/></td></tr>
<tr class="separator:gad2deeb66d51ade54e63d8f87ff2ec9d2"><td class="memSeparator" colspan="2"> </td></tr>
</table><table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaa177e7fe5820dd70d8c9e46ded131174"><td class="memItemLeft" align="right" valign="top"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a> (const <a class="el" href="structos_mail_q_def__t.html">osMailQDef_t</a> *queue_def, <a class="el" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> thread_id)</td></tr>
<tr class="memdesc:gaa177e7fe5820dd70d8c9e46ded131174"><td class="mdescLeft"> </td><td class="mdescRight">Create and Initialize mail queue. <a href="#gaa177e7fe5820dd70d8c9e46ded131174"></a><br/></td></tr>
<tr class="separator:gaa177e7fe5820dd70d8c9e46ded131174"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gadf5ce811bd6a56e617e902a1db6c2194"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gadf5ce811bd6a56e617e902a1db6c2194">osMailAlloc</a> (<a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> queue_id, uint32_t millisec)</td></tr>
<tr class="memdesc:gadf5ce811bd6a56e617e902a1db6c2194"><td class="mdescLeft"> </td><td class="mdescRight">Allocate a memory block from a mail. <a href="#gadf5ce811bd6a56e617e902a1db6c2194"></a><br/></td></tr>
<tr class="separator:gadf5ce811bd6a56e617e902a1db6c2194"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga8fde74f6fe5b9e88f75cc5eb8f2124fd"><td class="memItemLeft" align="right" valign="top">void * </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga8fde74f6fe5b9e88f75cc5eb8f2124fd">osMailCAlloc</a> (<a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> queue_id, uint32_t millisec)</td></tr>
<tr class="memdesc:ga8fde74f6fe5b9e88f75cc5eb8f2124fd"><td class="mdescLeft"> </td><td class="mdescRight">Allocate a memory block from a mail and set memory block to zero. <a href="#ga8fde74f6fe5b9e88f75cc5eb8f2124fd"></a><br/></td></tr>
<tr class="separator:ga8fde74f6fe5b9e88f75cc5eb8f2124fd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga485ef6f81854ebda8ffbce4832181e02"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga485ef6f81854ebda8ffbce4832181e02">osMailPut</a> (<a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> queue_id, void *mail)</td></tr>
<tr class="memdesc:ga485ef6f81854ebda8ffbce4832181e02"><td class="mdescLeft"> </td><td class="mdescRight">Put a mail to a queue. <a href="#ga485ef6f81854ebda8ffbce4832181e02"></a><br/></td></tr>
<tr class="separator:ga485ef6f81854ebda8ffbce4832181e02"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac6ad7e6e7d6c4a80e60da22c57a42ccd"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___c_m_s_i_s___r_t_o_s___definitions.html#structos_event">osEvent</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gac6ad7e6e7d6c4a80e60da22c57a42ccd">osMailGet</a> (<a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> queue_id, uint32_t millisec)</td></tr>
<tr class="memdesc:gac6ad7e6e7d6c4a80e60da22c57a42ccd"><td class="mdescLeft"> </td><td class="mdescRight">Get a mail from a queue. <a href="#gac6ad7e6e7d6c4a80e60da22c57a42ccd"></a><br/></td></tr>
<tr class="separator:gac6ad7e6e7d6c4a80e60da22c57a42ccd"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga27c1060cf21393f96b4fd1ed1c0167cc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga27c1060cf21393f96b4fd1ed1c0167cc">osMailFree</a> (<a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> queue_id, void *mail)</td></tr>
<tr class="memdesc:ga27c1060cf21393f96b4fd1ed1c0167cc"><td class="mdescLeft"> </td><td class="mdescRight">Free a memory block from a mail. <a href="#ga27c1060cf21393f96b4fd1ed1c0167cc"></a><br/></td></tr>
<tr class="separator:ga27c1060cf21393f96b4fd1ed1c0167cc"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Description</h2>
<p>A <b>mail</b> <b>queue</b> resembles a <a class="el" href="group___c_m_s_i_s___r_t_o_s___message.html">Message Queue</a>, but the data that is being transferred consists of memory blocks that need to be allocated (before putting data in) and freed (after taking data out). The mail queue uses a <a class="el" href="group___c_m_s_i_s___r_t_o_s___pool_mgmt.html">Memory Pool</a> to create formatted memory blocks and passes pointers to these blocks in a message queue. This allows the data to stay in an allocated memory block while only a pointer is moved between the separate threads. This is an advantage over <a class="el" href="group___c_m_s_i_s___r_t_o_s___message.html">messages</a> that can transfer only a 32-bit value or a pointer. Using the mail queue functions, you can control, send, receive, or wait for mail.</p>
<div class="image">
<img src="MailQueue.png" alt="MailQueue.png"/>
<div class="caption">
CMSIS-RTOS Mail Queue</div></div>
<h2>Working with Mail Queues</h2>
<p>Follow these steps to create and use a mail queue:</p>
<ol type="1">
<li>Declare a data structure that combines a number of elements: <div class="fragment"><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
<div class="line"> uint32_t length;</div>
<div class="line"> uint32_t width;</div>
<div class="line"> uint32_t height;</div>
<div class="line"> uint32_t weight;</div>
<div class="line">} properties_t;</div>
</div><!-- fragment --></li>
<li>Declare a mail queue made up of these objects: <div class="fragment"><div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga58d712b16c0c6668059f509386d1e55b" title="Create a Mail Queue Definition.">osMailQDef</a> (object_pool_q, 10, properties_t); <span class="comment">// Declare mail queue</span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5" title="Mail ID identifies the mail queue (pointer to a mail queue control block).">osMailQId</a> (object_pool_q_id); <span class="comment">// Mail queue ID</span></div>
</div><!-- fragment --></li>
<li>Then, create the mail pool in a thread: <div class="fragment"><div class="line">object_pool_q_id = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174" title="Create and Initialize mail queue.">osMailCreate</a>(<a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gad2deeb66d51ade54e63d8f87ff2ec9d2" title="Access a Mail Queue Definition.">osMailQ</a>(object_pool_q), NULL);</div>
</div><!-- fragment --></li>
<li>Allocate the mail queue within a thread and fill it with data: <div class="fragment"><div class="line">properties_t *object_data;</div>
<div class="line">*object_data = (properties_t *) <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gadf5ce811bd6a56e617e902a1db6c2194" title="Allocate a memory block from a mail.">osMailAlloc</a>(object_pool_q_id, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb" title="Timeout value.">osWaitForever</a>);</div>
<div class="line"> </div>
<div class="line">object_data->length = 100;</div>
<div class="line">object_data->width = 10;</div>
<div class="line">object_data->height = 23;</div>
<div class="line">object_data->weight = 1000;</div>
</div><!-- fragment --></li>
<li>Pass the pointer to the mail queue to another thread: <div class="fragment"><div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga485ef6f81854ebda8ffbce4832181e02" title="Put a mail to a queue.">osMailPut</a>(object_pool_q_id, object_data);</div>
</div><!-- fragment --></li>
<li>Access the data in another thread: <div class="fragment"><div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___definitions.html#structos_event" title="Event structure contains detailed information about an event.">osEvent</a> <span class="keyword">event</span> = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gac6ad7e6e7d6c4a80e60da22c57a42ccd" title="Get a mail from a queue.">osMailGet</a>(properties_q_id, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb" title="Timeout value.">osWaitForever</a>);</div>
<div class="line">properties_t *received = (properties_t *)event.value.p; <span class="comment">// ".p" indicates that the message is a pointer</span></div>
<div class="line">my_length(received->length);</div>
</div><!-- fragment --></li>
<li>Once the data has been used, the memory block must be freed so that the memory pool can be reused <div class="fragment"><div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga27c1060cf21393f96b4fd1ed1c0167cc" title="Free a memory block from a mail.">osMailFree</a>(object_pool_q_id, received);</div>
</div><!-- fragment --> </li>
</ol>
<h2 class="groupheader">Macro Definition Documentation</h2>
<a class="anchor" id="gaceb2e0071ce160d153047f2eac1aca8e"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define osFeature_MailQ   1</td>
</tr>
</table>
</div><div class="memdoc">
<p>A CMSIS-RTOS implementation may support mail queues.</p>
<ul>
<li>When <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaceb2e0071ce160d153047f2eac1aca8e">osFeature_MailQ</a> is 1 mail queues are supported.</li>
<li>When <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaceb2e0071ce160d153047f2eac1aca8e">osFeature_MailQ</a> is 0 no mail queues are supported. </li>
</ul>
</div>
</div>
<a class="anchor" id="gad2deeb66d51ade54e63d8f87ff2ec9d2"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define osMailQ</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">name</td><td>)</td>
<td>   &os_mailQ_def_##name</td>
</tr>
</table>
</div><div class="memdoc">
<p>Access to the mail queue definition for the function <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>.</p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">name</td><td>name of the queue </td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>CAN BE CHANGED: The parameter to <b>osMailQ</b> shall be consistent but the macro body is implementation specific in every CMSIS-RTOS. </dd></dl>
</div>
</div>
<a class="anchor" id="ga58d712b16c0c6668059f509386d1e55b"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">#define osMailQDef</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname">name, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">queue_sz, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"> </td>
<td class="paramname">type </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Define the attributes of a mail queue that can by the function <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a> using <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gad2deeb66d51ade54e63d8f87ff2ec9d2">osMailQ</a>.</p>
<dl class="section note"><dt>Note</dt><dd>The parameter <em>thread</em> registers the receiving thread for a mail and is needed for the general <a class="el" href="group___c_m_s_i_s___r_t_o_s___wait.html#ga8470c8aaedfde524a44e22e5b2328285">osWait</a> function to deliver the mail.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">name</td><td>name of the queue </td></tr>
<tr><td class="paramname">queue_sz</td><td>maximum number of messages in queue </td></tr>
<tr><td class="paramname">type</td><td>data type of a single message element </td></tr>
</table>
</dd>
</dl>
<dl class="section note"><dt>Note</dt><dd>CAN BE CHANGED: The parameter to <b>osMailQDef</b> shall be consistent but the macro body is implementation specific in every CMSIS-RTOS. </dd></dl>
</div>
</div>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="gadf5ce811bd6a56e617e902a1db6c2194"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void * osMailAlloc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> </td>
<td class="paramname"><em>queue_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>millisec</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">queue_id</td><td>mail queue ID obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">millisec</td><td><a class="el" href="_function_overview.html#CMSIS_RTOS_TimeOutValue">Timout Value</a> or 0 in case of no time-out </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to memory block that can be filled with mail or NULL in case of error. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMailAlloc</b> shall be consistent in every CMSIS-RTOS.</dd></dl>
<p>Allocate a memory block from the mail queue that is filled with the mail information.</p>
<p>The argument <em>queue_id</em> specifies a mail queue identifier that is obtain with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>.</p>
<p>The argument <em>millisec</em> specifies how long the system waits for a mail slot to become available. While the system waits the tread calling this function is put into the state <b>WAITING</b>. The <em>millisec</em> timeout can have the following values:</p>
<ul>
<li>when <em>millisec</em> is 0, the function returns instantly.</li>
<li>when <em>millisec</em> is set to <b>osWaitForever</b> the function will wait for an infinite time until a mail slot can be allocated.</li>
<li>all other values specify a time in millisecond for a timeout.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>The parameter <em>millisec</em> must be 0 for using this function in an ISR. </dd>
<dd>
<a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a> can call this function.</dd></dl>
<p>A NULL pointer is returned when no memory slot can be obtained or <em>queue</em> specifies an illegal parameter. </p>
</div>
</div>
<a class="anchor" id="ga8fde74f6fe5b9e88f75cc5eb8f2124fd"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">void * osMailCAlloc </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> </td>
<td class="paramname"><em>queue_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>millisec</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">queue_id</td><td>mail queue ID obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">millisec</td><td><a class="el" href="_function_overview.html#CMSIS_RTOS_TimeOutValue">Timout Value</a> or 0 in case of no time-out </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>pointer to memory block that can be filled with mail or NULL in case of error. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMailCAlloc</b> shall be consistent in every CMSIS-RTOS.</dd></dl>
<p>Allocate a memory block from the mail queue that is filled with the mail information. The memory block returned is cleared.</p>
<p>The argument <em>queue_id</em> specifies a mail queue identifier that is obtain with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>.</p>
<p>The argument <em>millisec</em> specifies how long the system waits for a mail slot to become available. While the system waits the thread that is calling this function is put into the state <b>WAITING</b>. The <em>millisec</em> timeout can have the following values:</p>
<ul>
<li>when <em>millisec</em> is 0, the function returns instantly.</li>
<li>when <em>millisec</em> is set to <b>osWaitForever</b> the function will wait for an infinite time until a mail slot can be allocated.</li>
<li>all other values specify a time in millisecond for a timeout.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>The parameter <em>millisec</em> must be 0 for using this function in an ISR. </dd>
<dd>
<a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a> can call this function.</dd></dl>
<p>A NULL pointer is returned when no memory block can be obtained or <em>queue</em> specifies an illegal parameter. </p>
</div>
</div>
<a class="anchor" id="gaa177e7fe5820dd70d8c9e46ded131174"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> osMailCreate </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structos_mail_q_def__t.html">osMailQDef_t</a> * </td>
<td class="paramname"><em>queue_def</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f">osThreadId</a> </td>
<td class="paramname"><em>thread_id</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">queue_def</td><td>reference to the mail queue definition obtain with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gad2deeb66d51ade54e63d8f87ff2ec9d2">osMailQ</a> </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">thread_id</td><td>thread ID (obtained by <a class="el" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gac59b5713cb083702dce759c73fd90dff">osThreadCreate</a> or <a class="el" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gab1df2a28925862ef8f9cf4e1c995c5a7">osThreadGetId</a>) or NULL. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>mail queue ID for reference by other functions or NULL in case of error. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMailCreate</b> shall be consistent in every CMSIS-RTOS.</dd></dl>
<p>Initialize and create a mail queue.</p>
<dl class="section note"><dt>Note</dt><dd>Cannot be called from <a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a>.</dd></dl>
<p><b>Code Example</b> </p>
<div class="fragment"><div class="line"><span class="preprocessor">#include "<a class="code" href="cmsis__os_8h.html">cmsis_os.h</a>"</span></div>
<div class="line"> </div>
<div class="line"><a class="code" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f" title="Thread ID identifies the thread (pointer to a thread control block).">osThreadId</a> tid_thread1; <span class="comment">// ID for thread 1</span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#adfeb153a84a81309e2d958268197617f" title="Thread ID identifies the thread (pointer to a thread control block).">osThreadId</a> tid_thread2; <span class="comment">// ID for thread 2</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{ <span class="comment">// Mail object structure</span></div>
<div class="line"> <span class="keywordtype">float</span> voltage; <span class="comment">// AD result of measured voltage</span></div>
<div class="line"> <span class="keywordtype">float</span> current; <span class="comment">// AD result of measured current</span></div>
<div class="line"> <span class="keywordtype">int</span> counter; <span class="comment">// A counter value</span></div>
<div class="line">} T_MEAS;</div>
<div class="line"> </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga58d712b16c0c6668059f509386d1e55b" title="Create a Mail Queue Definition.">osMailQDef</a>(mail, 16, T_MEAS); <span class="comment">// Define mail queue</span></div>
<div class="line"><a class="code" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5" title="Mail ID identifies the mail queue (pointer to a mail queue control block).">osMailQId</a> mail;</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> send_thread (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument); <span class="comment">// forward reference</span></div>
<div class="line"><span class="keywordtype">void</span> recv_thread (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument);</div>
<div class="line"> </div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaee93d929beb350f16e5cc7fa602e229f" title="Create a Thread Definition with function, priority, and stack requirements.">osThreadDef</a>(send_thread, <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#ga7f2b42f1983b9107775ec2a1c69a849aa45a2895ad30c79fb97de18cac7cc19f1" title="priority: normal (default)">osPriorityNormal</a>, 1, 0); <span class="comment">// thread definitions</span></div>
<div class="line"><a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaee93d929beb350f16e5cc7fa602e229f" title="Create a Thread Definition with function, priority, and stack requirements.">osThreadDef</a>(recv_thread, <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#ga7f2b42f1983b9107775ec2a1c69a849aa45a2895ad30c79fb97de18cac7cc19f1" title="priority: normal (default)">osPriorityNormal</a>, 1, 2000);</div>
<div class="line"> </div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Thread 1: Send thread</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="keywordtype">void</span> send_thread (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument) {</div>
<div class="line"> T_MEAS *mptr;</div>
<div class="line"> </div>
<div class="line"> mptr = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gadf5ce811bd6a56e617e902a1db6c2194" title="Allocate a memory block from a mail.">osMailAlloc</a>(mail, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb" title="Timeout value.">osWaitForever</a>); <span class="comment">// Allocate memory</span></div>
<div class="line"> mptr->voltage = 223.72; <span class="comment">// Set the mail content</span></div>
<div class="line"> mptr->current = 17.54;</div>
<div class="line"> mptr->counter = 120786;</div>
<div class="line"> <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga485ef6f81854ebda8ffbce4832181e02" title="Put a mail to a queue.">osMailPut</a>(mail, mptr); <span class="comment">// Send Mail</span></div>
<div class="line"> <a class="code" href="group___c_m_s_i_s___r_t_o_s___wait.html#ga02e19d5e723bfb06ba9324d625162255" title="Wait for Timeout (Time Delay).">osDelay</a>(100);</div>
<div class="line"> </div>
<div class="line"> mptr = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gadf5ce811bd6a56e617e902a1db6c2194" title="Allocate a memory block from a mail.">osMailAlloc</a>(mail, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb" title="Timeout value.">osWaitForever</a>); <span class="comment">// Allocate memory</span></div>
<div class="line"> mptr->voltage = 227.23; <span class="comment">// Prepare 2nd mail</span></div>
<div class="line"> mptr->current = 12.41;</div>
<div class="line"> mptr->counter = 170823;</div>
<div class="line"> <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga485ef6f81854ebda8ffbce4832181e02" title="Put a mail to a queue.">osMailPut</a>(mail, mptr); <span class="comment">// Send Mail</span></div>
<div class="line"> <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaf13a667493c5d629a90c13e113b99233" title="Pass control to next thread that is in state READY.">osThreadYield</a>(); <span class="comment">// Cooperative multitasking</span></div>
<div class="line"> <span class="comment">// We are done here, exit this thread</span></div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="comment">// Thread 2: Receive thread</span></div>
<div class="line"><span class="comment">//</span></div>
<div class="line"><span class="keywordtype">void</span> recv_thread (<span class="keywordtype">void</span> <span class="keyword">const</span> *argument) {</div>
<div class="line"> T_MEAS *rptr;</div>
<div class="line"> <a class="code" href="group___c_m_s_i_s___r_t_o_s___definitions.html#structos_event" title="Event structure contains detailed information about an event.">osEvent</a> evt;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">for</span> (;;) {</div>
<div class="line"> evt = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gac6ad7e6e7d6c4a80e60da22c57a42ccd" title="Get a mail from a queue.">osMailGet</a>(mail, <a class="code" href="cmsis__os_8h.html#a9eb9a7a797a42e4b55eb171ecc609ddb" title="Timeout value.">osWaitForever</a>); <span class="comment">// wait for mail</span></div>
<div class="line"> <span class="keywordflow">if</span> (evt.<a class="code" href="group___c_m_s_i_s___r_t_o_s___definitions.html#ad477a289f1f03ac45407b64268d707d3" title="status code: event or error information">status</a> == <a class="code" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99ea15b12e42b42b53f35fb8a2724ad02926" title="function completed; mail event occurred.">osEventMail</a>) {</div>
<div class="line"> rptr = evt.<a class="code" href="group___c_m_s_i_s___r_t_o_s___definitions.html#a0b9f8fd3645f01d8cb09cae82add2d7f" title="event value">value</a>.<a class="code" href="group___c_m_s_i_s___r_t_o_s___definitions.html#a117104b82864d3b23ec174af6d392709" title="message or mail as void pointer">p</a>;</div>
<div class="line"> printf (<span class="stringliteral">"\nVoltage: %.2f V\n"</span>, rptr->voltage);</div>
<div class="line"> printf (<span class="stringliteral">"Current: %.2f A\n"</span>, rptr->current);</div>
<div class="line"> printf (<span class="stringliteral">"Number of cycles: %d\n"</span>, rptr->counter);</div>
<div class="line"> <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga27c1060cf21393f96b4fd1ed1c0167cc" title="Free a memory block from a mail.">osMailFree</a>(mail, rptr); <span class="comment">// free memory allocated for mail</span></div>
<div class="line"> }</div>
<div class="line"> }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">void</span> StartApplication (<span class="keywordtype">void</span>) {</div>
<div class="line"> mail = <a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174" title="Create and Initialize mail queue.">osMailCreate</a>(<a class="code" href="group___c_m_s_i_s___r_t_o_s___mail.html#gad2deeb66d51ade54e63d8f87ff2ec9d2" title="Access a Mail Queue Definition.">osMailQ</a>(mail), NULL); <span class="comment">// create mail queue</span></div>
<div class="line"> </div>
<div class="line"> tid_thread1 = <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gac59b5713cb083702dce759c73fd90dff" title="Create a thread and add it to Active Threads and set it to state READY.">osThreadCreate</a>(<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453" title="Access a Thread definition.">osThread</a>(send_thread), NULL);</div>
<div class="line"> tid_thread2 = <a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gac59b5713cb083702dce759c73fd90dff" title="Create a thread and add it to Active Threads and set it to state READY.">osThreadCreate</a>(<a class="code" href="group___c_m_s_i_s___r_t_o_s___thread_mgmt.html#gaf0c7c6b5e09f8be198312144b5c9e453" title="Access a Thread definition.">osThread</a>(recv_thread), NULL);</div>
<div class="line"> :</div>
<div class="line">}</div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="ga27c1060cf21393f96b4fd1ed1c0167cc"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osMailFree </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> </td>
<td class="paramname"><em>queue_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>mail</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">queue_id</td><td>mail queue ID obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">mail</td><td>pointer to the memory block that was obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gac6ad7e6e7d6c4a80e60da22c57a42ccd">osMailGet</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMailFree</b> shall be consistent in every CMSIS-RTOS.</dd></dl>
<p>Free the memory block specified by <em>mail</em> and return it to the mail queue.</p>
<dl class="section note"><dt>Note</dt><dd><a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a> can call this function.</dd></dl>
<p><b><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html">Status and Error Codes</a></b><br/>
</p>
<ul>
<li><em>osOK:</em> the <em>mail</em> block is released.</li>
<li><em>osErrorValue:</em> <em>mail</em> block does not belong to the mail queue pool.</li>
<li><em>osErrorParameter:</em> the value to the parameter <em>queue_id</em> is incorrect. </li>
</ul>
</div>
</div>
<a class="anchor" id="gac6ad7e6e7d6c4a80e60da22c57a42ccd"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group___c_m_s_i_s___r_t_o_s___definitions.html#structos_event">osEvent</a> osMailGet </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> </td>
<td class="paramname"><em>queue_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">uint32_t </td>
<td class="paramname"><em>millisec</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">queue_id</td><td>mail queue ID obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">millisec</td><td><a class="el" href="_function_overview.html#CMSIS_RTOS_TimeOutValue">Timout Value</a> or 0 in case of no time-out </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>event that contains mail information or error code. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMailGet</b> shall be consistent in every CMSIS-RTOS.</dd></dl>
<p>Suspend the execution of the current <b>RUNNING</b> thread until a mail arrives. When a mail is already in the queue, the function returns instantly with the mail information.</p>
<p>The argument <em>millisec</em> specifies how long the system waits for a mail to arrive. While the system waits the thread that is calling this function is put into the state <b>WAITING</b>. The <em>millisec</em> timeout can have the following values:</p>
<ul>
<li>when <em>millisec</em> is 0, the function returns instantly.</li>
<li>when <em>millisec</em> is set to <b>osWaitForever</b> the function will wait for an infinite time until a mail arrives.</li>
<li>all other values specify a time in millisecond for a timeout.</li>
</ul>
<dl class="section note"><dt>Note</dt><dd>The parameter <em>millisec</em> must be 0 for using this function in an ISR. </dd>
<dd>
<a class="el" href="_function_overview.html#CMSIS_RTOS_ISR_Calls">Interrupt Service Routines</a> can call this function.</dd></dl>
<p><b><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html">Status and Error Codes</a></b><br/>
</p>
<ul>
<li><em>osOK:</em> no mail is available in the queue and no timeout was specified</li>
<li><em>osEventTimeout:</em> no mail has arrived during the given timeout period.</li>
<li><em>osEventMail:</em> mail received, <em>value.p</em> contains the pointer to mail content.</li>
<li><em>osErrorParameter:</em> a parameter is invalid or outside of a permitted range. </li>
</ul>
</div>
</div>
<a class="anchor" id="ga485ef6f81854ebda8ffbce4832181e02"></a>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html#gae2e091fefc4c767117727bd5aba4d99e">osStatus</a> osMailPut </td>
<td>(</td>
<td class="paramtype"><a class="el" href="cmsis__os_8h.html#a1dac049fb7725a8af8b26c71cbb373b5">osMailQId</a> </td>
<td class="paramname"><em>queue_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>mail</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">queue_id</td><td>mail queue ID obtained with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gaa177e7fe5820dd70d8c9e46ded131174">osMailCreate</a>. </td></tr>
<tr><td class="paramdir">[in]</td><td class="paramname">mail</td><td>memory block previously allocated with <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#gadf5ce811bd6a56e617e902a1db6c2194">osMailAlloc</a> or <a class="el" href="group___c_m_s_i_s___r_t_o_s___mail.html#ga8fde74f6fe5b9e88f75cc5eb8f2124fd">osMailCAlloc</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>status code that indicates the execution status of the function. </dd></dl>
<dl class="section note"><dt>Note</dt><dd>MUST REMAIN UNCHANGED: <b>osMailPut</b> shall be consistent in every CMSIS-RTOS.</dd></dl>
<p>Put the memory block specified with <em>mail</em> into the mail queue specified by <em>queue</em>.</p>
<p><b><a class="el" href="group___c_m_s_i_s___r_t_o_s___status.html">Status and Error Codes</a></b><br/>
</p>
<ul>
<li><em>osOK:</em> the message is put into the queue.</li>
<li><em>osErrorValue:</em> <em>mail</em> was previously not allocated as memory slot.</li>
<li><em>osErrorParameter:</em> a parameter is invalid or outside of a permitted range. </li>
</ul>
</div>
</div>
</div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="footer">Generated on Tue Oct 27 2015 14:35:43 for CMSIS-RTOS by ARM Ltd. All rights reserved.
<!--
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.2
-->
</li>
</ul>
</div>
</body>
</html>
|
