-
Notifications
You must be signed in to change notification settings - Fork 5
/
Copy pathex_async_8c-example.html
282 lines (282 loc) · 22.6 KB
/
ex_async_8c-example.html
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
<!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>WiredTiger: ex_async.c</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtreedata.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
$(document).ready(initResizable);
$(window).load(resizeHeight);
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="wiredtiger.css" 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: 56px;">
<td id="projectlogo"><a href="http://wiredtiger.com/"><img alt="Logo" src="LogoFinal-header.png" alt="WiredTiger" /></a></td>
<td style="padding-left: 0.5em;">
<div id="projectname">
 <span id="projectnumber">Version 2.9.2</span>
</div>
<div id="projectbrief"><!-- 2.9.2 --></div>
</td>
</tr>
</tbody>
</table>
</div>
<div class="banner">
<a href="https://github.com/wiredtiger/wiredtiger">Fork me on GitHub</a>
<a class="last" href="http://groups.google.com/group/wiredtiger-users">Join my user group</a>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.10 -->
<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>Related Pages</span></a></li>
<li><a href="modules.html"><span>Modules</span></a></li>
<li><a href="examples.html"><span>Examples</span></a></li>
<li><a href="community.html"><span>Community</span></a></li>
<li><a href="license.html"><span>License</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('ex_async_8c-example.html','');});
</script>
<div id="doc-content">
<div class="header">
<div class="headertitle">
<div class="title">ex_async.c</div> </div>
</div><!--header-->
<div class="contents">
<p>Show how to configure and use asynchronous operations.</p>
<div class="fragment"><div class="line"><span class="comment">/*-</span></div>
<div class="line"><span class="comment"> * Public Domain 2014-2016 MongoDB, Inc.</span></div>
<div class="line"><span class="comment"> * Public Domain 2008-2014 WiredTiger, Inc.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * This is free and unencumbered software released into the public domain.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * Anyone is free to copy, modify, publish, use, compile, sell, or</span></div>
<div class="line"><span class="comment"> * distribute this software, either in source code form or as a compiled</span></div>
<div class="line"><span class="comment"> * binary, for any purpose, commercial or non-commercial, and by any</span></div>
<div class="line"><span class="comment"> * means.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * In jurisdictions that recognize copyright laws, the author or authors</span></div>
<div class="line"><span class="comment"> * of this software dedicate any and all copyright interest in the</span></div>
<div class="line"><span class="comment"> * software to the public domain. We make this dedication for the benefit</span></div>
<div class="line"><span class="comment"> * of the public at large and to the detriment of our heirs and</span></div>
<div class="line"><span class="comment"> * successors. We intend this dedication to be an overt act of</span></div>
<div class="line"><span class="comment"> * relinquishment in perpetuity of all present and future rights to this</span></div>
<div class="line"><span class="comment"> * software under copyright law.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,</span></div>
<div class="line"><span class="comment"> * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF</span></div>
<div class="line"><span class="comment"> * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.</span></div>
<div class="line"><span class="comment"> * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR</span></div>
<div class="line"><span class="comment"> * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,</span></div>
<div class="line"><span class="comment"> * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR</span></div>
<div class="line"><span class="comment"> * OTHER DEALINGS IN THE SOFTWARE.</span></div>
<div class="line"><span class="comment"> *</span></div>
<div class="line"><span class="comment"> * ex_async.c</span></div>
<div class="line"><span class="comment"> * demonstrates how to use the asynchronous API.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="preprocessor">#include <errno.h></span></div>
<div class="line"><span class="preprocessor">#include <inttypes.h></span></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><span class="preprocessor">#include <string.h></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#ifndef _WIN32</span></div>
<div class="line"><span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"><span class="preprocessor">#include "windows_shim.h"</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <wiredtiger.h></span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#if defined(_lint)</span></div>
<div class="line"><span class="preprocessor">#define ATOMIC_ADD(v, val) ((v) += (val), (v))</span></div>
<div class="line"><span class="preprocessor">#elif defined(_WIN32)</span></div>
<div class="line"><span class="preprocessor">#define ATOMIC_ADD(v, val) (_InterlockedExchangeAdd(&(v), val) + val)</span></div>
<div class="line"><span class="preprocessor">#else</span></div>
<div class="line"><span class="preprocessor">#define ATOMIC_ADD(v, val) __sync_add_and_fetch(&(v), val)</span></div>
<div class="line"><span class="preprocessor">#endif</span></div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> global_error = 0;</div>
<div class="line"></div>
<div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span>{</div>
<div class="line"> <a name="_a0"></a><a class="code" href="struct_w_t___a_s_y_n_c___c_a_l_l_b_a_c_k.html">WT_ASYNC_CALLBACK</a> iface;</div>
<div class="line"> uint32_t num_keys;</div>
<div class="line">} ASYNC_KEYS;</div>
<div class="line"></div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span></div>
<div class="line">async_callback(<a class="code" href="struct_w_t___a_s_y_n_c___c_a_l_l_b_a_c_k.html">WT_ASYNC_CALLBACK</a> *cb,</div>
<div class="line"> <a name="_a1"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html">WT_ASYNC_OP</a> *op, <span class="keywordtype">int</span> wiredtiger_error, uint32_t flags)</div>
<div class="line">{</div>
<div class="line"> ASYNC_KEYS *asynckey = (ASYNC_KEYS *)cb;</div>
<div class="line"> <a class="code" href="group__wt.html#ga24152c6e1509c488192df653d511a82c">WT_ASYNC_OPTYPE</a> type;</div>
<div class="line"> <a name="_a2"></a><a class="code" href="group__wt.html#struct_w_t___i_t_e_m">WT_ITEM</a> k, v;</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *key, *value;</div>
<div class="line"> uint64_t id;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> (void)flags; <span class="comment">/* Unused */</span></div>
<div class="line"></div>
<div class="line"> ret = 0;</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Retrieve the operation's WT_ASYNC_OPTYPE type. */</span></div>
<div class="line"> type = op-><a name="a3"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#adb476ee741ca2483fad081c892aea420">get_type</a>(op);</div>
<div class="line"> <span class="comment">/* Retrieve the operation's 64-bit identifier. */</span></div>
<div class="line"> <span class="keywordtype">id</span> = op-><a name="a4"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#aa10a973cc683c48944f4909e2f18b3b9">get_id</a>(op);</div>
<div class="line"> <span class="comment">/* Check for a WiredTiger error. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (wiredtiger_error != 0) {</div>
<div class="line"> fprintf(stderr,</div>
<div class="line"> <span class="stringliteral">"ID %"</span> PRIu64 <span class="stringliteral">" error %d: %s\n"</span>,</div>
<div class="line"> <span class="keywordtype">id</span>, wiredtiger_error,</div>
<div class="line"> <a name="a5"></a><a class="code" href="group__wt.html#gae8bf720ddb4a7a7390b70424594c40fd">wiredtiger_strerror</a>(wiredtiger_error));</div>
<div class="line"> global_error = wiredtiger_error;</div>
<div class="line"> <span class="keywordflow">return</span> (1);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* If doing a search, retrieve the key/value pair. */</span></div>
<div class="line"> <span class="keywordflow">if</span> (type == <a name="a6"></a><a class="code" href="group__wt.html#gga24152c6e1509c488192df653d511a82ca0a70cdcda8801256cc086e8ab7d78b44">WT_AOP_SEARCH</a>) {</div>
<div class="line"> ret = op-><a name="a7"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a3c0ab580d7d7cc18f669ef8259254b8c">get_key</a>(op, &k);</div>
<div class="line"> key = k.<a name="a8"></a><a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>;</div>
<div class="line"> ret = op-><a name="a9"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a46ec0ae7d0294b9f4f206c390dd886b3">get_value</a>(op, &v);</div>
<div class="line"> value = v.<a class="code" href="group__wt.html#a57f5e62aa968275d7e398cfa70e49450">data</a>;</div>
<div class="line"> ATOMIC_ADD(asynckey->num_keys, 1);</div>
<div class="line"> printf(<span class="stringliteral">"Id %"</span> PRIu64 <span class="stringliteral">" got record: %s : %s\n"</span>, <span class="keywordtype">id</span>, key, value);</div>
<div class="line"> }</div>
<div class="line"> <span class="keywordflow">return</span> (ret);</div>
<div class="line">}</div>
<div class="line"><span class="keyword">static</span> ASYNC_KEYS ex_asynckeys = { {async_callback}, 0 };</div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#define MAX_KEYS 15</span></div>
<div class="line"></div>
<div class="line"><span class="keywordtype">int</span></div>
<div class="line">main(<span class="keywordtype">void</span>)</div>
<div class="line">{</div>
<div class="line"> <a class="code" href="struct_w_t___a_s_y_n_c___o_p.html">WT_ASYNC_OP</a> *op;</div>
<div class="line"> <a name="_a10"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html">WT_CONNECTION</a> *conn;</div>
<div class="line"> <a name="_a11"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html">WT_SESSION</a> *session;</div>
<div class="line"> <span class="keywordtype">int</span> i, ret;</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *home;</div>
<div class="line"> <span class="keywordtype">char</span> k[MAX_KEYS][16], v[MAX_KEYS][16];</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Create a clean test directory for this run of the test program if the</span></div>
<div class="line"><span class="comment"> * environment variable isn't already set (as is done by make check).</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> <span class="keywordflow">if</span> (getenv(<span class="stringliteral">"WIREDTIGER_HOME"</span>) == NULL) {</div>
<div class="line"> home = <span class="stringliteral">"WT_HOME"</span>;</div>
<div class="line"> ret = system(<span class="stringliteral">"rm -rf WT_HOME && mkdir WT_HOME"</span>);</div>
<div class="line"> } <span class="keywordflow">else</span></div>
<div class="line"> home = NULL;</div>
<div class="line"></div>
<div class="line"> ret = <a name="a12"></a><a class="code" href="group__wt.html#ga9e6adae3fc6964ef837a62795c7840ed">wiredtiger_open</a>(home, NULL,</div>
<div class="line"> <span class="stringliteral">"create,cache_size=100MB,"</span></div>
<div class="line"> <span class="stringliteral">"async=(enabled=true,ops_max=20,threads=2)"</span>, &conn);</div>
<div class="line"> ret = conn-><a name="a13"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#afc75c44ff4497627c59d9b6aaa64c9d8">open_session</a>(conn, NULL, NULL, &session);</div>
<div class="line"> ret = session-><a name="a14"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb">create</a>(</div>
<div class="line"> session, <span class="stringliteral">"table:async"</span>, <span class="stringliteral">"key_format=S,value_format=S"</span>);</div>
<div class="line"> <span class="comment">/* Insert a set of keys asynchronously. */</span></div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < MAX_KEYS; i++) {</div>
<div class="line"> <span class="keywordflow">while</span> ((ret = conn-><a name="a15"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a0cfd7bfb13c5b2ad8499f44e43d62672">async_new_op</a>(conn,</div>
<div class="line"> <span class="stringliteral">"table:async"</span>, NULL, &ex_asynckeys.iface, &op)) != 0) {</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * If we used up all the handles, pause and retry to</span></div>
<div class="line"><span class="comment"> * give the workers a chance to catch up.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> fprintf(stderr,</div>
<div class="line"> <span class="stringliteral">"asynchronous operation handle not available\n"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (ret == EBUSY)</div>
<div class="line"> sleep(1);</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> <span class="keywordflow">return</span> (EXIT_FAILURE);</div>
<div class="line"> }</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Set the operation's string key and value, and then do</span></div>
<div class="line"><span class="comment"> * an asynchronous insert.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> (void)snprintf(k[i], <span class="keyword">sizeof</span>(k), <span class="stringliteral">"key%d"</span>, i);</div>
<div class="line"> op-><a name="a16"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a9931651a57133df0d6d881e0cb9386ab">set_key</a>(op, k[i]);</div>
<div class="line"> (void)snprintf(v[i], <span class="keyword">sizeof</span>(v), <span class="stringliteral">"value%d"</span>, i);</div>
<div class="line"> op-><a name="a17"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a6cb91888b737850ebffd7e01215bff53">set_value</a>(op, v[i]);</div>
<div class="line"> ret = op-><a name="a18"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a60ed981eeae3a80b13ca8af708e4704b">insert</a>(op);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Wait for all outstanding operations to complete. */</span></div>
<div class="line"> ret = conn-><a name="a19"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a43d649d7eca3c9c281a833ec4e73473b">async_flush</a>(conn);</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Compact a table asynchronously, limiting the run-time to 5 minutes.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> ret = conn-><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a0cfd7bfb13c5b2ad8499f44e43d62672">async_new_op</a>(</div>
<div class="line"> conn, <span class="stringliteral">"table:async"</span>, <span class="stringliteral">"timeout=300"</span>, &ex_asynckeys.iface, &op);</div>
<div class="line"> ret = op-><a name="a20"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#ae6421d4c43369146502e8c7b54c06ac0">compact</a>(op);</div>
<div class="line"> <span class="comment">/* Search for the keys we just inserted, asynchronously. */</span></div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < MAX_KEYS; i++) {</div>
<div class="line"> <span class="keywordflow">while</span> ((ret = conn-><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#a0cfd7bfb13c5b2ad8499f44e43d62672">async_new_op</a>(conn,</div>
<div class="line"> <span class="stringliteral">"table:async"</span>, NULL, &ex_asynckeys.iface, &op)) != 0) {</div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * If we used up all the handles, pause and retry to</span></div>
<div class="line"><span class="comment"> * give the workers a chance to catch up.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> fprintf(stderr,</div>
<div class="line"> <span class="stringliteral">"asynchronous operation handle not available\n"</span>);</div>
<div class="line"> <span class="keywordflow">if</span> (ret == EBUSY)</div>
<div class="line"> sleep(1);</div>
<div class="line"> <span class="keywordflow">else</span></div>
<div class="line"> <span class="keywordflow">return</span> (EXIT_FAILURE);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Set the operation's string key and value, and then do</span></div>
<div class="line"><span class="comment"> * an asynchronous search.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> (void)snprintf(k[i], <span class="keyword">sizeof</span>(k), <span class="stringliteral">"key%d"</span>, i);</div>
<div class="line"> op-><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a9931651a57133df0d6d881e0cb9386ab">set_key</a>(op, k[i]);</div>
<div class="line"> ret = op-><a name="a21"></a><a class="code" href="struct_w_t___a_s_y_n_c___o_p.html#a5cd1b495d3796c5318a49422a3f7e220">search</a>(op);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">/*</span></div>
<div class="line"><span class="comment"> * Connection close automatically does an async_flush so it will wait</span></div>
<div class="line"><span class="comment"> * for all queued search operations to complete.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"> ret = conn-><a name="a22"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#af535c517df851eeac8ebf3594d40b545">close</a>(conn, NULL);</div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Searched for %"</span> PRIu32 <span class="stringliteral">" keys\n"</span>, ex_asynckeys.num_keys);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE);</div>
<div class="line">}</div>
</div><!-- fragment --> </div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="footer">Copyright (c) 2008-2016 MongoDB, Inc. All rights reserved. Contact <a href="mailto:[email protected]">[email protected]</a> for more information.</li>
</ul>
</div>
</body>
</html>