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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="docutils">
 183 <dt>#include &lt;libmemcachedutil-1.0/pool.h&gt;</dt>
 184 <dd>Compile and link with -lmemcachedutil -lmemcached</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="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="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><table class="docutils field-list" frame="void" rules="none">
 195 <col class="field-name" />
 196 <col class="field-body" />
 197 <tbody valign="top">
 198 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 199 <li><strong>option_string</strong> -- <a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">configuration</span></a> string</li>
 200 <li><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</li>
 201 </ul>
 202 </td>
 203 </tr>
 204 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">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>
 205 </td>
 206 </tr>
 207 </tbody>
 208 </table>
 209 </dd></dl>
 210
 211 <dl class="function">
 212 <dt id="_CPPv422memcached_pool_destroyP17memcached_pool_st">
 213 <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="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>
 214 <dd><table class="docutils field-list" frame="void" rules="none">
 215 <col class="field-name" />
 216 <col class="field-body" />
 217 <tbody valign="top">
 218 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><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</td>
 219 </tr>
 220 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body">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</td>
 221 </tr>
 222 </tbody>
 223 </table>
 224 </dd></dl>
 225
 226 <dl class="function">
 227 <dt id="_CPPv420memcached_pool_fetchP17memcached_pool_stP8timespecP18memcached_return_t">
 228 <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="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>
 229 <dd><div class="versionadded">
 230 <p><span class="versionmodified">New in version 0.53: </span>Synonym for memcached_pool_pop</p>
 231 </div>
 232 <table class="docutils field-list" frame="void" rules="none">
 233 <col class="field-name" />
 234 <col class="field-body" />
 235 <tbody valign="top">
 236 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 237 <li><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</li>
 238 <li><strong>relative_time</strong> -- time to block thread and wait for a connection to become available when pool size is exceeded, unless nullptr</li>
 239 <li><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></li>
 240 </ul>
 241 </td>
 242 </tr>
 243 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">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>
 244 </td>
 245 </tr>
 246 </tbody>
 247 </table>
 248 </dd></dl>
 249
 250 <dl class="function">
 251 <dt id="_CPPv422memcached_pool_releaseP17memcached_pool_stP12memcached_st">
 252 <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="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>
 253 <dd><div class="versionadded">
 254 <p><span class="versionmodified">New in version 0.53: </span>Synonym for memcached_pool_push.</p>
 255 </div>
 256 <table class="docutils field-list" frame="void" rules="none">
 257 <col class="field-name" />
 258 <col class="field-body" />
 259 <tbody valign="top">
 260 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 261 <li><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</li>
 262 <li><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</li>
 263 </ul>
 264 </td>
 265 </tr>
 266 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><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>
 267 </td>
 268 </tr>
 269 </tbody>
 270 </table>
 271 </dd></dl>
 272
 273 <dl class="function">
 274 <dt id="_CPPv427memcached_pool_behavior_setP17memcached_pool_st20memcached_behavior_t8uint64_t">
 275 <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="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>
 276 <dd><table class="docutils field-list" frame="void" rules="none">
 277 <col class="field-name" />
 278 <col class="field-body" />
 279 <tbody valign="top">
 280 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 281 <li><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</li>
 282 <li><strong>flag</strong> -- the <a class="reference internal" href="../libmemcached/memcached_behavior.html"><span class="doc">behavior</span></a> to change</li>
 283 <li><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></li>
 284 </ul>
 285 </td>
 286 </tr>
 287 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><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>
 288 </td>
 289 </tr>
 290 </tbody>
 291 </table>
 292 </dd></dl>
 293
 294 <dl class="function">
 295 <dt id="_CPPv427memcached_pool_behavior_getP17memcached_pool_st20memcached_behavior_tP8uint64_t">
 296 <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="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>
 297 <dd><table class="docutils field-list" frame="void" rules="none">
 298 <col class="field-name" />
 299 <col class="field-body" />
 300 <tbody valign="top">
 301 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 302 <li><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</li>
 303 <li><strong>flag</strong> -- the <a class="reference internal" href="../libmemcached/memcached_behavior.html"><span class="doc">behavior</span></a> to read</li>
 304 <li><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></li>
 305 </ul>
 306 </td>
 307 </tr>
 308 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><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>
 309 </td>
 310 </tr>
 311 </tbody>
 312 </table>
 313 </dd></dl>
 314
 315 <dl class="function">
 316 <dt id="_CPPv421memcached_pool_createP12memcached_stii">
 317 <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="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>
 318 <dd><div class="deprecated">
 319 <p><span class="versionmodified">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>
 320 </div>
 321 </dd></dl>
 322
 323 <dl class="function">
 324 <dt id="_CPPv418memcached_pool_popP17memcached_pool_stbP18memcached_return_t">
 325 <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="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>
 326 <dd><div class="deprecated">
 327 <p><span class="versionmodified">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>
 328 </div>
 329 </dd></dl>
 330
 331 <dl class="function">
 332 <dt id="_CPPv419memcached_pool_pushP17memcached_pool_stP12memcached_st">
 333 <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="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>
 334 <dd><div class="deprecated">
 335 <p><span class="versionmodified">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>
 336 </div>
 337 </dd></dl>
 338
 339 </div>
 340 <div class="section" id="description">
 341 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 342 <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
 343 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>
 344 objects. Please see <a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">libmemcached Configuration</span></a> for details on the
 345 format of the configuration string.</p>
 346 <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
 347 <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
 348 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
 349 <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
 350 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>
 351 <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
 352 connection pool. The relative_time argument specifies if the function should
 353 block and wait for a connection structure to be available if we try to exceed
 354 the maximum size. You need to specify time in relative time.</p>
 355 <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
 356 pool.</p>
 357 <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
 358 get/set behavior flags on all connections in the pool.</p>
 359 <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>
 360 </div>
 361 <div class="section" id="return-value">
 362 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 363 <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
 364 <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
 365 returns NULL.</p>
 366 <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
 367 pool (or NULL if an allocation cannot be satisfied).</p>
 368 <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>
 369 <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
 370 <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>
 371 <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
 372 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>
 373 instance was available, respectively.</p>
 374 <div class="admonition note">
 375 <p class="first admonition-title">Note</p>
 376 <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
 377 be obtained.</p>
 378 <p class="last">If any of the parameters passed to any of these functions is
 379 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>
 380 </div>
 381 </div>
 382 <div class="section" id="see-also">
 383 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 384 <ul class="simple">
 385 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 386 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 387 <li><a class="reference internal" href="../libmemcached/configuration.html"><span class="doc">libmemcached Configuration</span></a></li>
 388 <li><a class="reference internal" href="../libmemcached/memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
 389 </ul>
 390 </div>
 391 </div>
 392
 393
 394            </div>
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