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<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 2014-2019 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 <test_util.h></span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *home;</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) __atomic_add_fetch(&(v), val, __ATOMIC_SEQ_CST)</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, <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"></div><div class="line"> (void)flags; <span class="comment">/* Unused */</span></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, <span class="stringliteral">"ID %"</span> PRIu64 <span class="stringliteral">" error %d: %s\n"</span>, <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"> error_check(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"> error_check(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> (0);</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">int</span> argc, <span class="keywordtype">char</span> *argv[])</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="keywordtype">char</span> k[MAX_KEYS][16], v[MAX_KEYS][16];</div><div class="line"></div><div class="line"> home = example_setup(argc, argv);</div><div class="line"></div><div class="line"> error_check(<a name="a12"></a><a class="code" href="group__wt.html#gacbe8d118f978f5bfc8ccb4c77c9e8813">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>,</div><div class="line"> &conn));</div><div class="line"> error_check(conn-><a name="a13"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#adad5965cd4a60f65b5ac01f7ca6d1fc0">open_session</a>(conn, NULL, NULL, &session));</div><div class="line"> error_check(session-><a name="a14"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb">create</a>(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> (</div><div class="line"> (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, <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 give the workers a chance to catch</span></div><div class="line"><span class="comment"> * up.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> fprintf(stderr, <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 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"> error_check(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"> error_check(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"> error_check(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, <span class="stringliteral">"table:async"</span>, <span class="stringliteral">"timeout=300"</span>, &ex_asynckeys.iface, &op));</div><div class="line"> error_check(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> (</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>(conn, <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 give the workers a chance to catch</span></div><div class="line"><span class="comment"> * up.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> fprintf(stderr, <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 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"> error_check(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 for all queued search</span></div><div class="line"><span class="comment"> * operations to complete.</span></div><div class="line"><span class="comment"> */</span></div><div class="line"> error_check(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> (EXIT_SUCCESS);</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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