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 180
 181   <div class="section" id="working-with-memcached-pools">
 182 <h1>Working with memcached pools<a class="headerlink" href="#working-with-memcached-pools" title="Permalink to this headline">¶</a></h1>
 183 <div class="section" id="synopsis">
 184 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 185 <dl class="simple">
 186 <dt>#include &lt;libmemcachedutil-1.0/pool.h&gt;</dt><dd><p>Compile and link with -lmemcachedutil -lmemcached</p>
 187 </dd>
 188 </dl>
 189 <dl class="cpp type">
 190 <dt id="_CPPv417memcached_pool_st">
 191 <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>
 192 <dd></dd></dl>
 193
 194 <dl class="cpp function">
 195 <dt id="_CPPv414memcached_poolPKc6size_t">
 196 <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>
 197 <dd><dl class="field-list simple">
 198 <dt class="field-odd">Parameters</dt>
 199 <dd class="field-odd"><ul class="simple">
 200 <li><p><strong>option_string</strong> -- <a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">configuration</span></a> string</p></li>
 201 <li><p><strong>option_string_length</strong> -- length of <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">options_string</span></code> without any trailing zero byte</p></li>
 202 </ul>
 203 </dd>
 204 <dt class="field-even">Returns</dt>
 205 <dd class="field-even"><p>allocated and initialized <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_st</span></code></a> instance on success or nullptr on failure</p>
 206 </dd>
 207 </dl>
 208 </dd></dl>
 209
 210 <dl class="cpp function">
 211 <dt id="_CPPv422memcached_pool_destroyP17memcached_pool_st">
 212 <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>
 213 <dd><dl class="field-list simple">
 214 <dt class="field-odd">Parameters</dt>
 215 <dd class="field-odd"><p><strong>pool</strong> -- initialized <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_st</span></code></a> instance to free</p>
 216 </dd>
 217 <dt class="field-even">Returns</dt>
 218 <dd class="field-even"><p>pointer to the 'master' <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> instance by legacy</p>
 219 </dd>
 220 </dl>
 221 </dd></dl>
 222
 223 <dl class="cpp function">
 224 <dt id="_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t">
 225 <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>pool</em>, <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>
 226 <dd><div class="versionadded">
 227 <p><span class="versionmodified added">New in version 0.53: </span>Synonym for memcached_pool_pop</p>
 228 </div>
 229 <dl class="field-list simple">
 230 <dt class="field-odd">Parameters</dt>
 231 <dd class="field-odd"><ul class="simple">
 232 <li><p><strong>pool</strong> -- initialized <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_st</span></code></a> instance</p></li>
 233 <li><p><strong>relative_time</strong> -- time to block thread and wait for a connection to become available when pool size is exceeded, unless nullptr</p></li>
 234 <li><p><strong>rc</strong> -- out pointer to <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a></p></li>
 235 </ul>
 236 </dd>
 237 <dt class="field-even">Returns</dt>
 238 <dd class="field-even"><p>pointer to an available <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> instance</p>
 239 </dd>
 240 </dl>
 241 </dd></dl>
 242
 243 <dl class="cpp function">
 244 <dt id="_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st">
 245 <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>
 246 <dd><div class="versionadded">
 247 <p><span class="versionmodified added">New in version 0.53: </span>Synonym for memcached_pool_push.</p>
 248 </div>
 249 <dl class="field-list simple">
 250 <dt class="field-odd">Parameters</dt>
 251 <dd class="field-odd"><ul class="simple">
 252 <li><p><strong>pool</strong> -- initialized <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_st</span></code></a> instance</p></li>
 253 <li><p><strong>mmc</strong> -- 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> instance to return to the pool</p></li>
 254 </ul>
 255 </dd>
 256 <dt class="field-even">Returns</dt>
 257 <dd class="field-even"><p><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</p>
 258 </dd>
 259 </dl>
 260 </dd></dl>
 261
 262 <dl class="cpp function">
 263 <dt id="_CPPv427memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t">
 264 <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>
 265 <dd><dl class="field-list simple">
 266 <dt class="field-odd">Parameters</dt>
 267 <dd class="field-odd"><ul class="simple">
 268 <li><p><strong>pool</strong> -- initialized <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_st</span></code></a> instance</p></li>
 269 <li><p><strong>flag</strong> -- the <a class="reference internal" href="../libmemcached/memcached_behavior.html"><span class="doc">behavior</span></a> to change</p></li>
 270 <li><p><strong>value</strong> -- the value to set for <a class="reference internal" href="#_CPPv427memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t" title="memcached_pool_behavior_set::flag"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">flag</span></code></a></p></li>
 271 </ul>
 272 </dd>
 273 <dt class="field-even">Returns</dt>
 274 <dd class="field-even"><p><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</p>
 275 </dd>
 276 </dl>
 277 </dd></dl>
 278
 279 <dl class="cpp function">
 280 <dt id="_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t">
 281 <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>
 282 <dd><dl class="field-list simple">
 283 <dt class="field-odd">Parameters</dt>
 284 <dd class="field-odd"><ul class="simple">
 285 <li><p><strong>pool</strong> -- initialized <a class="reference internal" href="#_CPPv417memcached_pool_st" title="memcached_pool_st"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_pool_st</span></code></a> instance</p></li>
 286 <li><p><strong>flag</strong> -- the <a class="reference internal" href="../libmemcached/memcached_behavior.html"><span class="doc">behavior</span></a> to read</p></li>
 287 <li><p><strong>value</strong> -- out pointer to receive the set value of <a class="reference internal" href="#_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t" title="memcached_pool_behavior_get::flag"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">flag</span></code></a></p></li>
 288 </ul>
 289 </dd>
 290 <dt class="field-even">Returns</dt>
 291 <dd class="field-even"><p><a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_return_t</span></code></a> indicating success</p>
 292 </dd>
 293 </dl>
 294 </dd></dl>
 295
 296 <dl class="cpp function">
 297 <dt id="_CPPv421memcached_pool_createP12memcached_stii">
 298 <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>
 299 <dd><div class="deprecated">
 300 <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>
 301 </div>
 302 </dd></dl>
 303
 304 <dl class="cpp function">
 305 <dt id="_CPPv418memcached_pool_popP17memcached_pool_stbP18memcached_return_t">
 306 <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>
 307 <dd><div class="deprecated">
 308 <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>
 309 </div>
 310 </dd></dl>
 311
 312 <dl class="cpp function">
 313 <dt id="_CPPv419memcached_pool_pushP17memcached_pool_stP12memcached_st">
 314 <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>
 315 <dd><div class="deprecated">
 316 <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>
 317 </div>
 318 </dd></dl>
 319
 320 </div>
 321 <div class="section" id="description">
 322 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 323 <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
 324 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>
 325 objects. Please see <a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">libmemcached Configuration</span></a> for details on the
 326 format of the configuration string.</p>
 327 <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
 328 <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
 329 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
 330 <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
 331 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>
 332 <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
 333 connection pool. The relative_time argument specifies if the function should
 334 block and wait for a connection structure to be available if we try to exceed
 335 the maximum size. You need to specify time in relative time.</p>
 336 <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
 337 pool.</p>
 338 <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
 339 get/set behavior flags on all connections in the pool.</p>
 340 <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>
 341 </div>
 342 <div class="section" id="return-value">
 343 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 344 <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
 345 <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
 346 returns NULL.</p>
 347 <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
 348 pool (or NULL if an allocation cannot be satisfied).</p>
 349 <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>
 350 <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> return
 351 <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>
 352 <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> may return <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv4N18memcached_return_t17MEMCACHED_TIMEOUTE" title="MEMCACHED_TIMEOUT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_TIMEOUT</span></code></a> if a timeout occurs while
 353 waiting for a free <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> instance, <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv4N18memcached_return_t18MEMCACHED_NOTFOUNDE" title="MEMCACHED_NOTFOUND"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_NOTFOUND</span></code></a> if no <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>
 354 instance was available, respectively.</p>
 355 <div class="admonition note">
 356 <p class="admonition-title">Note</p>
 357 <p>If any method returns <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_IN_PROGRESS</span></code> then a lock on the pool could not
 358 be obtained.</p>
 359 <p>If any of the parameters passed to any of these functions is
 360 invalid, <a class="reference internal" href="../libmemcached/memcached_return_t.html#_CPPv4N18memcached_return_t27MEMCACHED_INVALID_ARGUMENTSE" title="MEMCACHED_INVALID_ARGUMENTS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_INVALID_ARGUMENTS</span></code></a> will be returned.</p>
 361 </div>
 362 </div>
 363 <div class="section" id="see-also">
 364 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 365 <ul class="simple">
 366 <li><p><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></p></li>
 367 <li><p><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></p></li>
 368 <li><p><a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">libmemcached Configuration</span></a></p></li>
 369 <li><p><a class="reference internal" href="../libmemcached/memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></p></li>
 370 </ul>
 371 </div>
 372 </div>
 373
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