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
|
<!DOCTYPE html
PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!-- saved from url=(0014)about:internet -->
<html xmlns:MSHelp="http://www.microsoft.com/MSHelp/" lang="en-us" xml:lang="en-us"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta name="DC.Type" content="reference">
<meta name="DC.Title" content="queue_node Template Class">
<meta name="DC.subject" content="queue_node Template Class">
<meta name="keywords" content="queue_node Template Class">
<meta name="DC.Relation" scheme="URI" content="../../reference/flow_graph.htm">
<meta name="DC.Relation" scheme="URI" content="message_passing_protocol.htm">
<meta name="DC.Format" content="XHTML">
<meta name="DC.Identifier" content="queue_node_cls">
<meta name="DC.Language" content="en-US">
<link rel="stylesheet" type="text/css" href="../../intel_css_styles.css">
<title>queue_node Template Class</title>
</head>
<body id="queue_node_cls">
<!-- ==============(Start:NavScript)================= -->
<script src="..\..\NavScript.js" language="JavaScript1.2" type="text/javascript"></script>
<script language="JavaScript1.2" type="text/javascript">WriteNavLink(2);</script>
<!-- ==============(End:NavScript)================= -->
<a name="queue_node_cls"><!-- --></a>
<h1 class="topictitle1">queue_node Template Class</h1>
<div>
<div class="section"><h2 class="sectiontitle">Summary</h2>
<p>An unbounded buffer of messages of type T. Messages are forwarded in
first-in first-out (FIFO) order.
</p>
</div>
<div class="section"><h2 class="sectiontitle">Syntax</h2>
<pre>template <typename T, typename A = cache_aligned_allocator<T> >
class queue_node;</pre>
</div>
<div class="section"><h2 class="sectiontitle">Header</h2>
<pre>#include "tbb/flow_graph.h"</pre>
</div>
<div class="section"><h2 class="sectiontitle">Description</h2>
<p>A
<span class="keyword">queue</span><span class="keyword">_node</span> is a
<span class="keyword">graph_node</span>,
<span class="keyword">receiver<T></span> and
<span class="keyword">sender<T></span> that forwards messages in first-in
first-out (FIFO) order to a single successor in its successor set. Successors
are tried in the order that they were registered with the node. If a successor
rejects the message, it is removed from the successor list as described by the
policy in the Message Passing Protocol, and the next successor in the set is
tried. This continues until a successor accepts the message, or all successors
have been attempted. Items that are successfully transferred to a successor are
removed from the buffer.
</p>
<p>A
<span class="keyword">queue_node</span> is reservable and supports a single
reservation at a time. While the
<span class="keyword">queue_node</span> is reserved, no other items will be
forwarded to successors and all
<span class="keyword">try_get</span> calls will return
<span class="keyword">false</span>. While reserved,
<span class="keyword">try_put</span> will still return
<span class="keyword">true</span> and add items to the
<span class="keyword">queue_node</span>.
</p>
<p>An allocator of type
<span class="keyword">A</span> is used to allocate internal memory for the
<span class="keyword">queue_node.</span>
</p>
<p><span class="keyword">T</span> must be copy-constructible and assignable.
</p>
<p>Rejection of messages by successors is handled using the protocol in
the Message Passing Protocol, see link below.
</p>
</div>
<div class="section"><h2 class="sectiontitle">Members</h2>
<pre>namespace tbb {
namespace flow {
template <typename T, typename A = cache_aligned_allocator<T> >
class queue_node :
public buffer_node<T, A> {
public:
queue_node( graph &g );
queue_node( const queue_node &src );
// receiver<T>
typedef T input_type;
typedef sender<input_type> predecessor_type;
bool try_put( const input_type &v );
bool register_predecessor( predecessor_type &p );
bool remove_predecessor( predecessor_type &p );
// sender<T>
typedef T output_type;
typedef receiver<output_type> successor_type;
bool register_successor( successor_type &r );
bool remove_successor( successor_type &r );
bool try_get( output_type &v );
bool try_reserve( output_type &v );
bool try_release( );
bool try_consume( );
};
}
}</pre>
<div class="tablenoborder"><table cellpadding="4" summary="" frame="border" border="1" cellspacing="0" rules="all"><span class="tabledesc">The following table provides additional information on the
members of this template class.
</span><thead align="left">
<tr>
<th class="cellrowborder" valign="top" width="33.89830508474576%" id="d81298e194">Member
</th>
<th class="cellrowborder" valign="top" width="66.10169491525423%" id="d81298e197">Description
</th>
</tr>
</thead>
<tbody>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">queue_node( graph &g
)</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Constructs an empty
<span class="keyword">queue_node</span> that belongs to the
<span class="keyword">graph g</span>.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">queue_node( const queue_node
&src )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Constructs an empty
<span class="keyword">queue_node</span> that belongs to the same
<span class="keyword">graph g</span> as
<span class="keyword">src</span>. The list of predecessors, the list of
successors and the messages in the buffer are NOT copied.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool try_put( const input_type
&v )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Adds
<span class="keyword">v</span> to all successors.
</p>
the
<span class="keyword">queue_node</span>. If
<span class="keyword">v</span> is the only item in the
<span class="keyword">queue_node</span> , a task is spawned to forward
the item to a successor.
<p><strong>Returns</strong>:
<span class="keyword">true</span>.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool register_predecessor(
predecessor_type &p )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Never rejects puts and therefore does not need to maintain a
list of predecessors.
</p>
<p><strong>Returns</strong>:
<span class="keyword">false</span>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool remove_predecessor(
predecessor_type &p )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Never rejects puts and therefore does not need to maintain a
list of predecessors.
</p>
<p><strong>Returns</strong>:
<span class="keyword">false</span>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool register_successor(
successor_type &r )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Adds
<span class="keyword">r</span> to the set of successors.
</p>
<p><strong>Returns</strong>:
<span class="keyword">true</span>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool remove_successor(
successor_type &r )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Removes
<span class="keyword">r</span> from the set of successors.
</p>
<p><strong>Returns</strong>:
<span class="keyword">true</span>
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool try_get( output_type &v
)</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p><strong>Returns</strong>:
<span class="keyword">true</span> if an item can be removed from the
front of the
<span class="keyword">queue_node</span> and assigned to
<span class="keyword">v</span>. Returns
<span class="keyword">false</span> if there is no item currently in the
<span class="keyword">queue_node</span> or if the node is reserved.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool try_reserve( output_type
&v )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>If the call returns
<span class="keyword">true</span>, the node is reserved and will
forward no more messages until the reservation has been released or consumed.
</p>
<p><strong>Returns</strong>:
<span class="keyword">true</span> if there is an item in the
<span class="keyword">queue_node</span> and the node is not currently
reserved. If an item can be returned, it is assigned to
<span class="keyword">v</span>. Returns
<span class="keyword">false</span> if there is no item currently in the
<span class="keyword">queue_node</span> or if the node is reserved.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool try_release( )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Release the reservation on the node. The item that was
returned in the last successful call to
<span class="keyword">try_reserve</span> remains in the
<span class="keyword">queue_node</span>.
</p>
<p><strong>Returns</strong>:
<span class="keyword">true</span> if the node is currently reserved and
<span class="keyword">false</span> otherwise.
</p>
</td>
</tr>
<tr>
<td class="cellrowborder" valign="top" width="33.89830508474576%" headers="d81298e194 "><span class="keyword">bool try_consume( )</span>
</td>
<td class="cellrowborder" valign="top" width="66.10169491525423%" headers="d81298e197 ">
<p>Releases the reservation on the
<span class="keyword">queue_node</span>. The item that was returned in
the last successful call to
<span class="keyword">try_reserve</span> is popped from the front of
the queue.
</p>
<p><strong>Returns</strong>:
<span class="keyword">true</span> if the
<span class="keyword">queue_node</span> is currently reserved and
<span class="keyword">false</span> otherwise.
</p>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="../../reference/flow_graph.htm">Flow Graph</a></div>
</div>
<div class="See Also">
<h2>See Also</h2>
<div class="linklist">
<div><a href="message_passing_protocol.htm">Message Passing Protocol
</a></div></div>
</div>
</body>
</html>
|
