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 177
 178   <div class="section" id="working-with-memcached-pools">
 179 <h1>Working with memcached pools<a class="headerlink" href="#working-with-memcached-pools" title="Permalink to this headline">¶</a></h1>
 180 <div class="section" id="synopsis">
 181 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 182 <dl class="simple">
 183 <dt>#include &lt;libmemcachedutil-1.0/pool.h&gt;</dt><dd><p>Compile and link with -lmemcachedutil -lmemcached</p>
 184 </dd>
 185 </dl>
 186 <dl class="type">
 187 <dt id="_CPPv417memcached_pool_st">
 188 <span id="_CPPv317memcached_pool_st"></span><span id="_CPPv217memcached_pool_st"></span><span id="memcached_pool_st"></span><em class="property">typedef </em><em class="property">struct</em> <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> <code class="sig-name descname">memcached_pool_st</code><a class="headerlink" href="#_CPPv417memcached_pool_st" title="Permalink to this definition">¶</a><br /></dt>
 189 <dd></dd></dl>
 190
 191 <dl class="function">
 192 <dt id="_CPPv414memcached_poolPKc6size_t">
 193 <span id="_CPPv314memcached_poolPKc6size_t"></span><span id="_CPPv214memcached_poolPKc6size_t"></span><span id="memcached_pool__cCP.s"></span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<code class="sig-name descname">memcached_pool</code><span class="sig-paren">(</span><em class="property">const</em> char *<em>option_string</em>, size_t <em>option_string_length</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv414memcached_poolPKc6size_t" title="Permalink to this definition">¶</a><br /></dt>
 194 <dd></dd></dl>
 195
 196 <dl class="function">
 197 <dt id="_CPPv422memcached_pool_destroyP17memcached_pool_st">
 198 <span id="_CPPv322memcached_pool_destroyP17memcached_pool_st"></span><span id="_CPPv222memcached_pool_destroyP17memcached_pool_st"></span><span id="memcached_pool_destroy__memcached_pool_stP"></span><a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<code class="sig-name descname">memcached_pool_destroy</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<em>pool</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_pool_destroyP17memcached_pool_st" title="Permalink to this definition">¶</a><br /></dt>
 199 <dd></dd></dl>
 200
 201 <dl class="function">
 202 <dt id="_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t">
 203 <span id="_CPPv320memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t"></span><span id="_CPPv220memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t"></span><span id="memcached_pool_fetch__memcached_pool_stP.timespecP.memcached_return_tP"></span><a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<code class="sig-name descname">memcached_pool_fetch</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *, <em class="property">struct</em> timespec *<em>relative_time</em>, <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>rc</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 204 <dd><div class="versionadded">
 205 <p><span class="versionmodified added">New in version 0.53: </span>Synonym for memcached_pool_pop</p>
 206 </div>
 207 </dd></dl>
 208
 209 <dl class="function">
 210 <dt id="_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st">
 211 <span id="_CPPv322memcached_pool_releaseP17memcached_pool_stP12memcached_st"></span><span id="_CPPv222memcached_pool_releaseP17memcached_pool_stP12memcached_st"></span><span id="memcached_pool_release__memcached_pool_stP.memcached_stP"></span><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_pool_release</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<em>pool</em>, <a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>mmc</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st" title="Permalink to this definition">¶</a><br /></dt>
 212 <dd><div class="versionadded">
 213 <p><span class="versionmodified added">New in version 0.53: </span>Synonym for memcached_pool_push.</p>
 214 </div>
 215 </dd></dl>
 216
 217 <dl class="function">
 218 <dt id="_CPPv427memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t">
 219 <span id="_CPPv327memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t"></span><span id="_CPPv227memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t"></span><span id="memcached_pool_behavior_set__memcached_pool_stP.memcached_behavior_t.uint64_t"></span><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_pool_behavior_set</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<em>pool</em>, <a class="reference internal" href="../libmemcached/memcached_behavior.html#_CPPv420memcached_behavior_t" title="memcached_behavior_t">memcached_behavior_t</a> <em>flag</em>, uint64_t <em>data</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv427memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 220 <dd></dd></dl>
 221
 222 <dl class="function">
 223 <dt id="_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t">
 224 <span id="_CPPv327memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t"></span><span id="_CPPv227memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t"></span><span id="memcached_pool_behavior_get__memcached_pool_stP.memcached_behavior_t.uint64_tP"></span><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_pool_behavior_get</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<em>pool</em>, <a class="reference internal" href="../libmemcached/memcached_behavior.html#_CPPv420memcached_behavior_t" title="memcached_behavior_t">memcached_behavior_t</a> <em>flag</em>, uint64_t *<em>value</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 225 <dd></dd></dl>
 226
 227 <dl class="function">
 228 <dt id="_CPPv421memcached_pool_createP12memcached_stii">
 229 <span id="_CPPv321memcached_pool_createP12memcached_stii"></span><span id="_CPPv221memcached_pool_createP12memcached_stii"></span><span id="memcached_pool_create__memcached_stP.i.i"></span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<code class="sig-name descname">memcached_pool_create</code><span class="sig-paren">(</span><a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>mmc</em>, int <em>initial</em>, int <em>max</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv421memcached_pool_createP12memcached_stii" title="Permalink to this definition">¶</a><br /></dt>
 230 <dd><div class="deprecated">
 231 <p><span class="versionmodified deprecated">Deprecated since version 0.46: </span>Use <a class="reference internal" href="#_CPPv414memcached_poolPKc6size_t" title="memcached_pool"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool()</span></code></a></p>
 232 </div>
 233 </dd></dl>
 234
 235 <dl class="function">
 236 <dt id="_CPPv418memcached_pool_popP17memcached_pool_stbP18memcached_return_t">
 237 <span id="_CPPv318memcached_pool_popP17memcached_pool_stbP18memcached_return_t"></span><span id="_CPPv218memcached_pool_popP17memcached_pool_stbP18memcached_return_t"></span><span id="memcached_pool_pop__memcached_pool_stP.b.memcached_return_tP"></span><a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<code class="sig-name descname">memcached_pool_pop</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<em>pool</em>, bool <em>block</em>, <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> *<em>rc</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv418memcached_pool_popP17memcached_pool_stbP18memcached_return_t" title="Permalink to this definition">¶</a><br /></dt>
 238 <dd><div class="deprecated">
 239 <p><span class="versionmodified deprecated">Deprecated since version 0.53: </span>Use <a class="reference internal" href="#_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t" title="memcached_pool_fetch"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_fetch()</span></code></a></p>
 240 </div>
 241 </dd></dl>
 242
 243 <dl class="function">
 244 <dt id="_CPPv419memcached_pool_pushP17memcached_pool_stP12memcached_st">
 245 <span id="_CPPv319memcached_pool_pushP17memcached_pool_stP12memcached_st"></span><span id="_CPPv219memcached_pool_pushP17memcached_pool_stP12memcached_st"></span><span id="memcached_pool_push__memcached_pool_stP.memcached_stP"></span><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="sig-name descname">memcached_pool_push</code><span class="sig-paren">(</span><a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st">memcached_pool_st</a> *<em>pool</em>, <a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>mmc</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv419memcached_pool_pushP17memcached_pool_stP12memcached_st" title="Permalink to this definition">¶</a><br /></dt>
 246 <dd><div class="deprecated">
 247 <p><span class="versionmodified deprecated">Deprecated since version 0.53: </span>Use <a class="reference internal" href="#_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st" title="memcached_pool_release"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_release()</span></code></a></p>
 248 </div>
 249 </dd></dl>
 250
 251 </div>
 252 <div class="section" id="description">
 253 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 254 <p><a class="reference internal" href="#_CPPv414memcached_poolPKc6size_t" title="memcached_pool"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool()</span></code></a> is used to create a connection pool of objects you may use to
 255 remove the overhead of using memcached_clone for short lived <a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a>
 256 objects. Please see <a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">libmemcached Configuration</span></a> for details on the
 257 format of the configuration string.</p>
 258 <p><a class="reference internal" href="#_CPPv422memcached_pool_destroyP17memcached_pool_st" title="memcached_pool_destroy"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_destroy()</span></code></a> is used to destroy the connection pool created with
 259 <a class="reference internal" href="#_CPPv421memcached_pool_createP12memcached_stii" title="memcached_pool_create"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_create()</span></code></a> and release all allocated resources. It will return the
 260 pointer to the <a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> structure passed as an argument to
 261 <a class="reference internal" href="#_CPPv421memcached_pool_createP12memcached_stii" title="memcached_pool_create"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_create()</span></code></a>, and returns the ownership of the pointer to the caller
 262 when created with <a class="reference internal" href="#_CPPv421memcached_pool_createP12memcached_stii" title="memcached_pool_create"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_create()</span></code></a>, otherwise NULL is returned..</p>
 263 <p><a class="reference internal" href="#_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t" title="memcached_pool_fetch"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_fetch()</span></code></a> is used to fetch a connection structure from the
 264 connection pool. The relative_time argument specifies if the function should
 265 block and wait for a connection structure to be available if we try to exceed
 266 the maximum size. You need to specify time in relative time.</p>
 267 <p><a class="reference internal" href="#_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st" title="memcached_pool_release"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_release()</span></code></a> is used to return a connection structure back to the
 268 pool.</p>
 269 <p><a class="reference internal" href="#_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t" title="memcached_pool_behavior_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_behavior_get()</span></code></a> and <a class="reference internal" href="#_CPPv427memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t" title="memcached_pool_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_behavior_set()</span></code></a> is used to
 270 get/set behavior flags on all connections in the pool.</p>
 271 <p>Both <a class="reference internal" href="#_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st" title="memcached_pool_release"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_release()</span></code></a> and <a class="reference internal" href="#_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t" title="memcached_pool_fetch"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_fetch()</span></code></a> are thread safe.</p>
 272 </div>
 273 <div class="section" id="return-value">
 274 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 275 <p><a class="reference internal" href="#_CPPv422memcached_pool_destroyP17memcached_pool_st" title="memcached_pool_destroy"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_destroy()</span></code></a> returns the pointer (and ownership) to the
 276 <a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> structure used to create the pool. If connections are in use it
 277 returns NULL.</p>
 278 <p><a class="reference internal" href="#_CPPv418memcached_pool_popP17memcached_pool_stbP18memcached_return_t" title="memcached_pool_pop"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_pop()</span></code></a> returns a pointer to a <a class="reference internal" href="../libmemcached/memcached_create.html#_CPPv412memcached_st" title="memcached_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_st</span></code></a> structure from the
 279 pool (or NULL if an allocation cannot be satisfied).</p>
 280 <p><a class="reference internal" href="#_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st" title="memcached_pool_release"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_release()</span></code></a> returns <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv4N18memcached_return_t17MEMCACHED_SUCCESSE" title="MEMCACHED_SUCCESS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_SUCCESS</span></code></a> upon success.</p>
 281 <p><a class="reference internal" href="#_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t" title="memcached_pool_behavior_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_behavior_get()</span></code></a> and <a class="reference internal" href="#_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t" title="memcached_pool_behavior_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_behavior_get()</span></code></a> returns
 282 <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv4N18memcached_return_t17MEMCACHED_SUCCESSE" title="MEMCACHED_SUCCESS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_SUCCESS</span></code></a> upon success.</p>
 283 <p>If any methods returns MEMCACHED_IN_PROGRESS then a lock on the pool could not
 284 be obtained. If any of the parameters passed to any of these functions is
 285 invalid, MEMCACHED_INVALID_ARGUMENTS will be returned.</p>
 286 <p>memcached_pool_fetch may return MEMCACHED_TIMEOUT if a timeout occurs while
 287 waiting for a free memcached_st. MEMCACHED_NOTFOUND if no memcached_st was
 288 available.</p>
 289 </div>
 290 <div class="section" id="see-also">
 291 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 292 <ul class="simple">
 293 <li><p><em class="manpage"><a class="manpage reference external" href="http://man7.org/linux/man-pages/man1/memcached.1.html">memcached(1)</a></em></p></li>
 294 <li><p><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></p></li>
 295 <li><p><a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">libmemcached Configuration</span></a></p></li>
 296 <li><p><a class="reference internal" href="../libmemcached/memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></p></li>
 297 </ul>
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