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<div class="title">ex_thread.c</div> </div>
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<p>Shows how to access a database with multiple threads.</p>
<div class="fragment"><div class="line"><span class="comment">/*-</span></div>
<div class="line"><span class="comment"> * Public Domain 2008-2013 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>
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<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_thread.c</span></div>
<div class="line"><span class="comment"> * This is an example demonstrating how to create and access a simple</span></div>
<div class="line"><span class="comment"> * table from multiple threads.</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <string.h></span></div>
<div class="line"><span class="preprocessor">#include <pthread.h></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="keywordtype">void</span> *scan_thread(<span class="keywordtype">void</span> *arg);</div>
<div class="line"></div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span> *home = NULL;</div>
<div class="line"><span class="preprocessor">#define NUM_THREADS 10</span></div>
<div class="line"><span class="preprocessor"></span></div>
<div class="line"><a name="_a0"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html" title="A connection to a WiredTiger database.">WT_CONNECTION</a> *conn;</div>
<div class="line"></div>
<div class="line"><span class="keywordtype">void</span> *</div>
<div class="line">scan_thread(<span class="keywordtype">void</span> *arg)</div>
<div class="line">{</div>
<div class="line"> <a name="_a1"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html" title="All data operations are performed in the context of a WT_SESSION.">WT_SESSION</a> *session;</div>
<div class="line"> <a name="_a2"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html" title="A WT_CURSOR handle is the interface to a cursor.">WT_CURSOR</a> *cursor;</div>
<div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span> *key, *value;</div>
<div class="line"> <span class="keywordtype">int</span> ret;</div>
<div class="line"></div>
<div class="line"> ret = conn-><a name="a3"></a><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#afc75c44ff4497627c59d9b6aaa64c9d8" title="Open a session.">open_session</a>(conn, NULL, NULL, &session);</div>
<div class="line"> ret = session-><a name="a4"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d" title="Open a new cursor on a data source or duplicate an existing cursor.">open_cursor</a>(session, <span class="stringliteral">"table:access"</span>,</div>
<div class="line"> NULL, NULL, &cursor);</div>
<div class="line"></div>
<div class="line"> <span class="comment">/* Show all records. */</span></div>
<div class="line"> <span class="keywordflow">while</span> ((ret = cursor-><a name="a5"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a0503f16bd8f3d05aa3552f229b3a8e1b" title="Return the next record.">next</a>(cursor)) == 0) {</div>
<div class="line"> ret = cursor-><a name="a6"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af19f6f9d9c7fc248ab38879032620b2f" title="Get the key for the current record.">get_key</a>(cursor, &key);</div>
<div class="line"> ret = cursor-><a name="a7"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#af85364a5af50b95bbc46c82e72f75c01" title="Get the value for the current record.">get_value</a>(cursor, &value);</div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Got record: %s : %s\n"</span>, key, value);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (arg);</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___s_e_s_s_i_o_n.html" title="All data operations are performed in the context of a WT_SESSION.">WT_SESSION</a> *session;</div>
<div class="line"> <a class="code" href="struct_w_t___c_u_r_s_o_r.html" title="A WT_CURSOR handle is the interface to a cursor.">WT_CURSOR</a> *cursor;</div>
<div class="line"> pthread_t threads[NUM_THREADS];</div>
<div class="line"> <span class="keywordtype">int</span> i, ret;</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">if</span> ((ret = <a name="a8"></a><a class="code" href="group__wt.html#ga9e6adae3fc6964ef837a62795c7840ed" title="Open a connection to a database.">wiredtiger_open</a>(home, NULL,</div>
<div class="line"> <span class="stringliteral">"create"</span>, &conn)) != 0)</div>
<div class="line"> fprintf(stderr, <span class="stringliteral">"Error connecting to %s: %s\n"</span>,</div>
<div class="line"> home, <a name="a9"></a><a class="code" href="group__wt.html#gac95e70a24d09cf6928398512990e1474" title="Return information about an error as a string; wiredtiger_strerror is a superset of the ISO C99/POSIX...">wiredtiger_strerror</a>(ret));</div>
<div class="line"> <span class="comment">/* Note: further error checking omitted for clarity. */</span></div>
<div class="line"></div>
<div class="line"> ret = conn-><a class="code" href="struct_w_t___c_o_n_n_e_c_t_i_o_n.html#afc75c44ff4497627c59d9b6aaa64c9d8" title="Open a session.">open_session</a>(conn, NULL, NULL, &session);</div>
<div class="line"> ret = session-><a name="a10"></a><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#a358ca4141d59c345f401c58501276bbb" title="Create a table, column group, index or file.">create</a>(session, <span class="stringliteral">"table:access"</span>,</div>
<div class="line"> <span class="stringliteral">"key_format=S,value_format=S"</span>);</div>
<div class="line"> ret = session-><a class="code" href="struct_w_t___s_e_s_s_i_o_n.html#afb5b4a69c2c5cafe411b2b04fdc1c75d" title="Open a new cursor on a data source or duplicate an existing cursor.">open_cursor</a>(session, <span class="stringliteral">"table:access"</span>, NULL,</div>
<div class="line"> <span class="stringliteral">"overwrite"</span>, &cursor);</div>
<div class="line"> cursor-><a name="a11"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#ad1088d719df40babc1f57d086691ebdc" title="Set the key for the next operation.">set_key</a>(cursor, <span class="stringliteral">"key1"</span>);</div>
<div class="line"> cursor-><a name="a12"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#a27f7cbd0cd3e561f6a145704813ad64c" title="Set the value for the next operation.">set_value</a>(cursor, <span class="stringliteral">"value1"</span>);</div>
<div class="line"> ret = cursor-><a name="a13"></a><a class="code" href="struct_w_t___c_u_r_s_o_r.html#aac90d9fbcc031570f924db55f8a1cee3" title="Insert a record, and optionally overwrite an existing record.">insert</a>(cursor);</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#a96f25dfa6447034aea1f67ab02ab5698" title="Close the session handle.">close</a>(session, NULL);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < NUM_THREADS; i++)</div>
<div class="line"> ret = pthread_create(&threads[i], NULL, scan_thread, NULL);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span> (i = 0; i < NUM_THREADS; i++)</div>
<div class="line"> ret = pthread_join(threads[i], NULL);</div>
<div class="line"></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#af535c517df851eeac8ebf3594d40b545" title="Close a connection.">close</a>(conn, NULL);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> (ret);</div>
<div class="line">}</div>
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