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 192   <div class="section" id="behaviors-of-the-library">
 193 <h1>Behaviors of the library<a class="headerlink" href="#behaviors-of-the-library" title="Permalink to this headline">¶</a></h1>
 194 <p>Manipulate the behavior of a memcached_st structure.</p>
 195 <div class="section" id="synopsis">
 196 <h2>SYNOPSIS<a class="headerlink" href="#synopsis" title="Permalink to this headline">¶</a></h2>
 197 <dl class="docutils">
 198 <dt>#include &lt;libmemcached/memcached.h&gt;</dt>
 199 <dd>Compile and link with -lmemcached</dd>
 200 </dl>
 201 <dl class="function">
 202 <dt id="_CPPv422memcached_behavior_getP12memcached_st20memcached_behavior_t">
 203 <span id="_CPPv322memcached_behavior_getP12memcached_st20memcached_behavior_t"></span><span id="_CPPv222memcached_behavior_getP12memcached_st20memcached_behavior_t"></span><span id="memcached_behavior_get__memcached_stP.memcached_behavior_t"></span>uint64_t <code class="descname">memcached_behavior_get</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <a class="reference internal" href="#_CPPv420memcached_behavior_t" title="memcached_behavior_t">memcached_behavior_t</a> <em>flag</em><span class="sig-paren">)</span><a class="headerlink" href="#_CPPv422memcached_behavior_getP12memcached_st20memcached_behavior_t" title="Permalink to this definition">¶</a><br /></dt>
 204 <dd><table class="docutils field-list" frame="void" rules="none">
 205 <col class="field-name" />
 206 <col class="field-body" />
 207 <tbody valign="top">
 208 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 209 <li><strong>ptr</strong> -- pointer to initialized <a class="reference internal" href="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> struct</li>
 210 <li><strong>flag</strong> -- <a class="reference internal" href="#_CPPv420memcached_behavior_t" title="memcached_behavior_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_t</span></code></a> to query</li>
 211 </ul>
 212 </td>
 213 </tr>
 214 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last">the vaue set for <a class="reference internal" href="#_CPPv422memcached_behavior_getP12memcached_st20memcached_behavior_t" title="memcached_behavior_get::flag"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">flag</span></code></a></p>
 215 </td>
 216 </tr>
 217 </tbody>
 218 </table>
 219 </dd></dl>
 220
 221 <dl class="function">
 222 <dt id="_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t">
 223 <span id="_CPPv322memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t"></span><span id="_CPPv222memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t"></span><span id="memcached_behavior_set__memcached_stP.memcached_behavior_t.uint64_t"></span><a class="reference internal" href="memcached_return_t.html#_CPPv418memcached_return_t" title="memcached_return_t">memcached_return_t</a> <code class="descname">memcached_behavior_set</code><span class="sig-paren">(</span><a class="reference internal" href="memcached_create.html#_CPPv412memcached_st" title="memcached_st">memcached_st</a> *<em>ptr</em>, <a class="reference internal" href="#_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="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="Permalink to this definition">¶</a><br /></dt>
 224 <dd><table class="docutils field-list" frame="void" rules="none">
 225 <col class="field-name" />
 226 <col class="field-body" />
 227 <tbody valign="top">
 228 <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
 229 <li><strong>ptr</strong> -- pointer to initialized <a class="reference internal" href="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> struct</li>
 230 <li><strong>flag</strong> -- <a class="reference internal" href="#_CPPv420memcached_behavior_t" title="memcached_behavior_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_t</span></code></a> to set</li>
 231 <li><strong>data</strong> -- the value to set for <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set::flag"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">flag</span></code></a></li>
 232 </ul>
 233 </td>
 234 </tr>
 235 <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first last"><a class="reference internal" href="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>
 236 </td>
 237 </tr>
 238 </tbody>
 239 </table>
 240 <div class="versionchanged">
 241 <p><span class="versionmodified">Changed in version 0.17: </span>The <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set::data"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">data</span></code></a> argument of <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> was changed
 242 from taking a pointer to data value, to taking a uin64_t.</p>
 243 </div>
 244 </dd></dl>
 245
 246 <dl class="type">
 247 <dt id="c.memcached_behavior_t">
 248 enum <a class="reference internal" href="#c.memcached_behavior_t" title="memcached_behavior_t">memcached_behavior_t</a> <code class="descname">memcached_behavior_t</code><a class="headerlink" href="#c.memcached_behavior_t" title="Permalink to this definition">¶</a></dt>
 249 <dd></dd></dl>
 250
 251 <dl class="enum">
 252 <dt id="_CPPv420memcached_behavior_t">
 253 <span id="_CPPv320memcached_behavior_t"></span><span id="_CPPv220memcached_behavior_t"></span><em class="property">enum </em><code class="descname">memcached_behavior_t</code><a class="headerlink" href="#_CPPv420memcached_behavior_t" title="Permalink to this definition">¶</a><br /></dt>
 254 <dd><dl class="enumerator">
 255 <dt id="_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE">
 256 <span id="_CPPv3N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE"></span><span id="_CPPv2N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_USE_UDP</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE" title="Permalink to this definition">¶</a><br /></dt>
 257 <dd><p>Causes <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> to use the UDP transport when communicating with a
 258 memcached server. Not all I/O operations are tested when this behavior
 259 is enabled.</p>
 260 <p>The following operations will return <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE" title="MEMCACHED_NOT_SUPPORTED"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_NOT_SUPPORTED</span></code></a> when
 261 executed with <a class="reference internal" href="#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE" title="memcached_behavior_t::MEMCACHED_BEHAVIOR_USE_UDP"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_USE_UDP</span></code></a> enabled:</p>
 262 <ul class="simple">
 263 <li><a class="reference internal" href="memcached_version.html#_CPPv417memcached_versionP12memcached_st" title="memcached_version"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_version()</span></code></a>,</li>
 264 <li><a class="reference internal" href="memcached_stats.html#_CPPv414memcached_statP12memcached_stPcP18memcached_return_t" title="memcached_stat"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_stat()</span></code></a>,</li>
 265 <li><a class="reference internal" href="memcached_get.html#_CPPv413memcached_getP12memcached_stPKc6size_tP6size_tP8uint32_tP18memcached_return_t" title="memcached_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_get()</span></code></a>,</li>
 266 <li><a class="reference internal" href="memcached_get.html#_CPPv420memcached_get_by_keyP12memcached_stPKc6size_tPKc6size_tP6size_tP8uint32_tP18memcached_return_t" title="memcached_get_by_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_get_by_key()</span></code></a>,</li>
 267 <li><a class="reference internal" href="memcached_get.html#_CPPv414memcached_mgetP12memcached_stPPCKcPK6size_t6size_t" title="memcached_mget"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_mget()</span></code></a>,</li>
 268 <li><a class="reference internal" href="memcached_get.html#_CPPv421memcached_mget_by_keyP12memcached_stPKc6size_tPPCKcPK6size_t6size_t" title="memcached_mget_by_key"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_mget_by_key()</span></code></a>,</li>
 269 <li><a class="reference internal" href="memcached_fetch.html#_CPPv415memcached_fetchP12memcached_stPcP6size_tP6size_tP8uint32_tP18memcached_return_t" title="memcached_fetch"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_fetch()</span></code></a>,</li>
 270 <li><a class="reference internal" href="memcached_get.html#_CPPv422memcached_fetch_resultP12memcached_stP19memcached_result_stP18memcached_return_t" title="memcached_fetch_result"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_fetch_result()</span></code></a>,</li>
 271 <li><a class="reference internal" href="memcached_get.html#_CPPv423memcached_fetch_executeP12memcached_stP20memcached_execute_fnPv8uint32_t" title="memcached_fetch_execute"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_fetch_execute()</span></code></a>.</li>
 272 </ul>
 273 <p>All other operations are tested but are executed in a 'fire-and-forget'
 274 mode, in which once the client has executed the operation, no attempt
 275 will be made to ensure the operation has been received and acted on by
 276 the server.</p>
 277 <p><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> does not allow TCP and UDP servers to be shared within
 278 the same <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> client 'instance'. An attempt to add a TCP
 279 server when this behavior is enabled will result in a
 280 <a class="reference internal" href="memcached_return_t.html#_CPPv4N18memcached_return_t31MEMCACHED_INVALID_HOST_PROTOCOLE" title="MEMCACHED_INVALID_HOST_PROTOCOL"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_INVALID_HOST_PROTOCOL</span></code></a>, as will attempting to add a UDP
 281 server when this behavior has not been enabled.</p>
 282 </dd></dl>
 283
 284 <dl class="enumerator">
 285 <dt id="_CPPv4N20memcached_behavior_t27MEMCACHED_BEHAVIOR_NO_BLOCKE">
 286 <span id="_CPPv3N20memcached_behavior_t27MEMCACHED_BEHAVIOR_NO_BLOCKE"></span><span id="_CPPv2N20memcached_behavior_t27MEMCACHED_BEHAVIOR_NO_BLOCKE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_NO_BLOCK</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t27MEMCACHED_BEHAVIOR_NO_BLOCKE" title="Permalink to this definition">¶</a><br /></dt>
 287 <dd><p>This enables <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">SO_LINGER</span></code> only, so the <em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/2/close">close(2)</a></em> call on the
 288 socket returns immediately.  I/O is always handled asynchronously in
 289 recent versions of <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code>.</p>
 290 </dd></dl>
 291
 292 <dl class="enumerator">
 293 <dt id="_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SND_TIMEOUTE">
 294 <span id="_CPPv3N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SND_TIMEOUTE"></span><span id="_CPPv2N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SND_TIMEOUTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_SND_TIMEOUT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SND_TIMEOUTE" title="Permalink to this definition">¶</a><br /></dt>
 295 <dd><p>This sets the microsecond behavior of the socket against the SO_SNDTIMEO
 296 flag.</p>
 297 </dd></dl>
 298
 299 <dl class="enumerator">
 300 <dt id="_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_RCV_TIMEOUTE">
 301 <span id="_CPPv3N20memcached_behavior_t30MEMCACHED_BEHAVIOR_RCV_TIMEOUTE"></span><span id="_CPPv2N20memcached_behavior_t30MEMCACHED_BEHAVIOR_RCV_TIMEOUTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_RCV_TIMEOUT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_RCV_TIMEOUTE" title="Permalink to this definition">¶</a><br /></dt>
 302 <dd><p>This sets the microsecond behavior of the socket against the SO_RCVTIMEO
 303 flag.</p>
 304 </dd></dl>
 305
 306 <dl class="enumerator">
 307 <dt id="_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_TCP_NODELAYE">
 308 <span id="_CPPv3N20memcached_behavior_t30MEMCACHED_BEHAVIOR_TCP_NODELAYE"></span><span id="_CPPv2N20memcached_behavior_t30MEMCACHED_BEHAVIOR_TCP_NODELAYE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_TCP_NODELAY</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_TCP_NODELAYE" title="Permalink to this definition">¶</a><br /></dt>
 309 <dd><p>Disables Nagle's algorithm.
 310 See <a class="reference external" href="https://tools.ietf.org/html/rfc896">RFC 896</a>.</p>
 311 </dd></dl>
 312
 313 <dl class="enumerator">
 314 <dt id="_CPPv4N20memcached_behavior_t23MEMCACHED_BEHAVIOR_HASHE">
 315 <span id="_CPPv3N20memcached_behavior_t23MEMCACHED_BEHAVIOR_HASHE"></span><span id="_CPPv2N20memcached_behavior_t23MEMCACHED_BEHAVIOR_HASHE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_HASH</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t23MEMCACHED_BEHAVIOR_HASHE" title="Permalink to this definition">¶</a><br /></dt>
 316 <dd><p>Set the <a class="reference internal" href="memcached_generate_hash_value.html#_CPPv416memcached_hash_t" title="memcached_hash_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">hash</span> <span class="pre">algorithm</span></code></a> used for keys.</p>
 317 <p>Each hash has its advantages and its weaknesses. If you don't know or
 318 don't care, just go with the default.</p>
 319 </dd></dl>
 320
 321 <dl class="enumerator">
 322 <dt id="_CPPv4N20memcached_behavior_t31MEMCACHED_BEHAVIOR_DISTRIBUTIONE">
 323 <span id="_CPPv3N20memcached_behavior_t31MEMCACHED_BEHAVIOR_DISTRIBUTIONE"></span><span id="_CPPv2N20memcached_behavior_t31MEMCACHED_BEHAVIOR_DISTRIBUTIONE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_DISTRIBUTION</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t31MEMCACHED_BEHAVIOR_DISTRIBUTIONE" title="Permalink to this definition">¶</a><br /></dt>
 324 <dd><p>Setting a <a class="reference internal" href="#_CPPv431memcached_server_distribution_t" title="memcached_server_distribution_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_server_distribution_t</span></code></a> you can enable different
 325 means of distributing values to servers.</p>
 326 <p>The default method is <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_MODULAE" title="MEMCACHED_DISTRIBUTION_MODULA"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_MODULA</span></code></a> (hash of the
 327 key modulo number of servers).</p>
 328 <p>You can enable consistent hashing by setting
 329 <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t33MEMCACHED_DISTRIBUTION_CONSISTENTE" title="MEMCACHED_DISTRIBUTION_CONSISTENT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_CONSISTENT</span></code></a>. Consistent hashing delivers better
 330 distribution and allows servers to be added to the cluster with minimal
 331 cache losses.</p>
 332 <p>Currently <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t33MEMCACHED_DISTRIBUTION_CONSISTENTE" title="MEMCACHED_DISTRIBUTION_CONSISTENT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_CONSISTENT</span></code></a> is an alias for the value
 333 <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE" title="MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA</span></code></a>.</p>
 334 </dd></dl>
 335
 336 <dl class="enumerator">
 337 <dt id="_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_CACHE_LOOKUPSE">
 338 <span id="_CPPv3N20memcached_behavior_t32MEMCACHED_BEHAVIOR_CACHE_LOOKUPSE"></span><span id="_CPPv2N20memcached_behavior_t32MEMCACHED_BEHAVIOR_CACHE_LOOKUPSE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_CACHE_LOOKUPS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_CACHE_LOOKUPSE" title="Permalink to this definition">¶</a><br /></dt>
 339 <dd><blockquote>
 340 <div><div class="deprecated">
 341 <p><span class="versionmodified">Deprecated since version 0.46(?): </span>DNS lookups are now always cached until an error occurs with the
 342 server.</p>
 343 </div>
 344 </div></blockquote>
 345 <p>Memcached can cache named lookups so that DNS lookups are made only once.</p>
 346 </dd></dl>
 347
 348 <dl class="enumerator">
 349 <dt id="_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SUPPORT_CASE">
 350 <span id="_CPPv3N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SUPPORT_CASE"></span><span id="_CPPv2N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SUPPORT_CASE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_SUPPORT_CAS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_SUPPORT_CASE" title="Permalink to this definition">¶</a><br /></dt>
 351 <dd><p>Support CAS operations (this is not enabled by default at this point in
 352 the server since it imposes a slight performance penalty).</p>
 353 </dd></dl>
 354
 355 <dl class="enumerator">
 356 <dt id="_CPPv4N20memcached_behavior_t25MEMCACHED_BEHAVIOR_KETAMAE">
 357 <span id="_CPPv3N20memcached_behavior_t25MEMCACHED_BEHAVIOR_KETAMAE"></span><span id="_CPPv2N20memcached_behavior_t25MEMCACHED_BEHAVIOR_KETAMAE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_KETAMA</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t25MEMCACHED_BEHAVIOR_KETAMAE" title="Permalink to this definition">¶</a><br /></dt>
 358 <dd><p>Sets the default distribution to
 359 <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE" title="MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA</span></code></a> and the hash to
 360 <a class="reference internal" href="memcached_generate_hash_value.html#_CPPv4N16memcached_hash_t18MEMCACHED_HASH_MD5E" title="MEMCACHED_HASH_MD5"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_HASH_MD5</span></code></a>.</p>
 361 </dd></dl>
 362
 363 <dl class="enumerator">
 364 <dt id="_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_KETAMA_WEIGHTEDE">
 365 <span id="_CPPv3N20memcached_behavior_t34MEMCACHED_BEHAVIOR_KETAMA_WEIGHTEDE"></span><span id="_CPPv2N20memcached_behavior_t34MEMCACHED_BEHAVIOR_KETAMA_WEIGHTEDE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_KETAMA_WEIGHTED</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_KETAMA_WEIGHTEDE" title="Permalink to this definition">¶</a><br /></dt>
 366 <dd><p>Sets the default distribution to
 367 <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE" title="MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA</span></code></a> with the weighted tests.
 368 Makes the default hashing algorithm for keys use <a class="reference internal" href="memcached_generate_hash_value.html#_CPPv4N16memcached_hash_t18MEMCACHED_HASH_MD5E" title="MEMCACHED_HASH_MD5"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_HASH_MD5</span></code></a>.</p>
 369 </dd></dl>
 370
 371 <dl class="enumerator">
 372 <dt id="_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_KETAMA_HASHE">
 373 <span id="_CPPv3N20memcached_behavior_t30MEMCACHED_BEHAVIOR_KETAMA_HASHE"></span><span id="_CPPv2N20memcached_behavior_t30MEMCACHED_BEHAVIOR_KETAMA_HASHE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_KETAMA_HASH</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t30MEMCACHED_BEHAVIOR_KETAMA_HASHE" title="Permalink to this definition">¶</a><br /></dt>
 374 <dd><p>Sets the <a class="reference internal" href="memcached_generate_hash_value.html#_CPPv416memcached_hash_t" title="memcached_hash_t"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">hashing</span> <span class="pre">algorithm</span></code></a> for host mapping on continuum.</p>
 375 </dd></dl>
 376
 377 <dl class="enumerator">
 378 <dt id="_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_KETAMA_COMPATE">
 379 <span id="_CPPv3N20memcached_behavior_t32MEMCACHED_BEHAVIOR_KETAMA_COMPATE"></span><span id="_CPPv2N20memcached_behavior_t32MEMCACHED_BEHAVIOR_KETAMA_COMPATE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_KETAMA_COMPAT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_KETAMA_COMPATE" title="Permalink to this definition">¶</a><br /></dt>
 380 <dd><p>Sets the compatibility mode. The value can be set to either
 381 <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_KETAMA_COMPAT_LIBMEMCACHED</span></code> (this is the default) or
 382 <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_KETAMA_COMPAT_SPY</span></code> to be compatible with the SPY Memcached
 383 client for Java.</p>
 384 </dd></dl>
 385
 386 <dl class="enumerator">
 387 <dt id="_CPPv4N20memcached_behavior_t31MEMCACHED_BEHAVIOR_POLL_TIMEOUTE">
 388 <span id="_CPPv3N20memcached_behavior_t31MEMCACHED_BEHAVIOR_POLL_TIMEOUTE"></span><span id="_CPPv2N20memcached_behavior_t31MEMCACHED_BEHAVIOR_POLL_TIMEOUTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_POLL_TIMEOUT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t31MEMCACHED_BEHAVIOR_POLL_TIMEOUTE" title="Permalink to this definition">¶</a><br /></dt>
 389 <dd><p>Modify the timeout in milliseconds value that is used by poll. The
 390 default value is -1. An signed int must be passed to
 391 <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> to change this value (this requires casting).
 392 For <a class="reference internal" href="#_CPPv422memcached_behavior_getP12memcached_st20memcached_behavior_t" title="memcached_behavior_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_get()</span></code></a> a 'signed int' value will be cast and
 393 returned as 'unsigned long long'.</p>
 394 </dd></dl>
 395
 396 <dl class="enumerator">
 397 <dt id="_CPPv4N20memcached_behavior_t28MEMCACHED_BEHAVIOR_USER_DATAE">
 398 <span id="_CPPv3N20memcached_behavior_t28MEMCACHED_BEHAVIOR_USER_DATAE"></span><span id="_CPPv2N20memcached_behavior_t28MEMCACHED_BEHAVIOR_USER_DATAE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_USER_DATA</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t28MEMCACHED_BEHAVIOR_USER_DATAE" title="Permalink to this definition">¶</a><br /></dt>
 399 <dd><div class="deprecated">
 400 <p><span class="versionmodified">Deprecated since version &lt;: </span>0.30</p>
 401 </div>
 402 </dd></dl>
 403
 404 <dl class="enumerator">
 405 <dt id="_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BUFFER_REQUESTSE">
 406 <span id="_CPPv3N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BUFFER_REQUESTSE"></span><span id="_CPPv2N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BUFFER_REQUESTSE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_BUFFER_REQUESTS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BUFFER_REQUESTSE" title="Permalink to this definition">¶</a><br /></dt>
 407 <dd><p>Enabling buffered IO causes commands to &quot;buffer&quot; instead of being sent.
 408 Any action that gets data causes this buffer to be be sent to the remote
 409 connection. Quiting the connection or closing down the connection will
 410 also cause the buffered data to be pushed to the remote connection.</p>
 411 </dd></dl>
 412
 413 <dl class="enumerator">
 414 <dt id="_CPPv4N20memcached_behavior_t29MEMCACHED_BEHAVIOR_VERIFY_KEYE">
 415 <span id="_CPPv3N20memcached_behavior_t29MEMCACHED_BEHAVIOR_VERIFY_KEYE"></span><span id="_CPPv2N20memcached_behavior_t29MEMCACHED_BEHAVIOR_VERIFY_KEYE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_VERIFY_KEY</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t29MEMCACHED_BEHAVIOR_VERIFY_KEYE" title="Permalink to this definition">¶</a><br /></dt>
 416 <dd><p>Enabling this will cause <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> to test all keys to verify that
 417 they are valid keys.</p>
 418 </dd></dl>
 419
 420 <dl class="enumerator">
 421 <dt id="_CPPv4N20memcached_behavior_t29MEMCACHED_BEHAVIOR_SORT_HOSTSE">
 422 <span id="_CPPv3N20memcached_behavior_t29MEMCACHED_BEHAVIOR_SORT_HOSTSE"></span><span id="_CPPv2N20memcached_behavior_t29MEMCACHED_BEHAVIOR_SORT_HOSTSE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_SORT_HOSTS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t29MEMCACHED_BEHAVIOR_SORT_HOSTSE" title="Permalink to this definition">¶</a><br /></dt>
 423 <dd><p>Enabling this will cause hosts that are added to be placed in the host
 424 list in sorted order. This will defeat consistent hashing.</p>
 425 </dd></dl>
 426
 427 <dl class="enumerator">
 428 <dt id="_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_CONNECT_TIMEOUTE">
 429 <span id="_CPPv3N20memcached_behavior_t34MEMCACHED_BEHAVIOR_CONNECT_TIMEOUTE"></span><span id="_CPPv2N20memcached_behavior_t34MEMCACHED_BEHAVIOR_CONNECT_TIMEOUTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_CONNECT_TIMEOUT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_CONNECT_TIMEOUTE" title="Permalink to this definition">¶</a><br /></dt>
 430 <dd><p>Set the timeout during socket connection in milliseconds.
 431 Specifying -1 means an infinite time‐out.</p>
 432 </dd></dl>
 433
 434 <dl class="enumerator">
 435 <dt id="_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BINARY_PROTOCOLE">
 436 <span id="_CPPv3N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BINARY_PROTOCOLE"></span><span id="_CPPv2N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BINARY_PROTOCOLE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_BINARY_PROTOCOL</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_BINARY_PROTOCOLE" title="Permalink to this definition">¶</a><br /></dt>
 437 <dd><p>Enable the use of the binary protocol. Please note that you cannot
 438 toggle this flag on an open connection.</p>
 439 </dd></dl>
 440
 441 <dl class="enumerator">
 442 <dt id="_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_IO_MSG_WATERMARKE">
 443 <span id="_CPPv3N20memcached_behavior_t35MEMCACHED_BEHAVIOR_IO_MSG_WATERMARKE"></span><span id="_CPPv2N20memcached_behavior_t35MEMCACHED_BEHAVIOR_IO_MSG_WATERMARKE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_IO_MSG_WATERMARK</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_IO_MSG_WATERMARKE" title="Permalink to this definition">¶</a><br /></dt>
 444 <dd><p>Set this value to tune the number of messages that may be sent before
 445 <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> should start to automatically drain the input queue.</p>
 446 <p>Setting this value to high, may cause <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> to deadlock (trying
 447 to send data, but the send will block because the input buffer in the
 448 kernel is full).</p>
 449 </dd></dl>
 450
 451 <dl class="enumerator">
 452 <dt id="_CPPv4N20memcached_behavior_t37MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARKE">
 453 <span id="_CPPv3N20memcached_behavior_t37MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARKE"></span><span id="_CPPv2N20memcached_behavior_t37MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARKE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARK</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t37MEMCACHED_BEHAVIOR_IO_BYTES_WATERMARKE" title="Permalink to this definition">¶</a><br /></dt>
 454 <dd><p>Set this value to tune the number of bytes that may be sent before
 455 <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> should start to automatically drain the input queue (need
 456 at least 10 IO requests sent without reading the input buffer).</p>
 457 <p>Setting this value to high, may cause libmemcached to deadlock (trying
 458 to send data, but the send will block because the input buffer in the
 459 kernel is full).</p>
 460 </dd></dl>
 461
 462 <dl class="enumerator">
 463 <dt id="_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_IO_KEY_PREFETCHE">
 464 <span id="_CPPv3N20memcached_behavior_t34MEMCACHED_BEHAVIOR_IO_KEY_PREFETCHE"></span><span id="_CPPv2N20memcached_behavior_t34MEMCACHED_BEHAVIOR_IO_KEY_PREFETCHE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_IO_KEY_PREFETCH</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t34MEMCACHED_BEHAVIOR_IO_KEY_PREFETCHE" title="Permalink to this definition">¶</a><br /></dt>
 465 <dd><p>The binary protocol works a bit different than the textual protocol in
 466 that a multiget is implemented as a pipe of single get-operations which
 467 are sent to the server in a chunk.</p>
 468 <p>If you are using large multigets from your application, you may improve
 469 the latency of the gets by setting this value so you send out the first
 470 chunk of requests when you hit the specified limit.  It allows the
 471 servers to start processing the requests to send the data back while the
 472 rest of the requests are created and sent to the server.</p>
 473 </dd></dl>
 474
 475 <dl class="enumerator">
 476 <dt id="_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_NOREPLYE">
 477 <span id="_CPPv3N20memcached_behavior_t26MEMCACHED_BEHAVIOR_NOREPLYE"></span><span id="_CPPv2N20memcached_behavior_t26MEMCACHED_BEHAVIOR_NOREPLYE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_NOREPLY</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_NOREPLYE" title="Permalink to this definition">¶</a><br /></dt>
 478 <dd><p>Set this value to specify that you really don't care about the result
 479 from your storage commands (set, add, replace, append, prepend).</p>
 480 </dd></dl>
 481
 482 <dl class="enumerator">
 483 <dt id="_CPPv4N20memcached_behavior_t37MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICASE">
 484 <span id="_CPPv3N20memcached_behavior_t37MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICASE"></span><span id="_CPPv2N20memcached_behavior_t37MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICASE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICAS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t37MEMCACHED_BEHAVIOR_NUMBER_OF_REPLICASE" title="Permalink to this definition">¶</a><br /></dt>
 485 <dd><p>Specify the number of replicas <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> should store of each item
 486 (on different servers).</p>
 487 <p>This replication does not dedicate certain memcached servers to store
 488 the replicas in, but instead it will store the replicas together with
 489 all of the other objects (on the 'n' next servers specified in your
 490 server list).</p>
 491 <p>Requires the binary protocol and only supports (M)GET/SET/DELETE.</p>
 492 <p><strong>NOTE</strong>: <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> does not guarantee nor enforce any consistency.</p>
 493 </dd></dl>
 494
 495 <dl class="enumerator">
 496 <dt id="_CPPv4N20memcached_behavior_t41MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READE">
 497 <span id="_CPPv3N20memcached_behavior_t41MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READE"></span><span id="_CPPv2N20memcached_behavior_t41MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READ</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t41MEMCACHED_BEHAVIOR_RANDOMIZE_REPLICA_READE" title="Permalink to this definition">¶</a><br /></dt>
 498 <dd><p>Allows randomizing the replica reads starting point. Normally the read
 499 is done from primary server and in case of failure the read is done from
 500 primary + 1, then primary + 2 all the way to 'n' replicas.</p>
 501 <p>This allows distributing read load to multiple servers with the expense
 502 of more write traffic.</p>
 503 <p><strong>NOTE</strong>: Only errors to communicate with a server are considered
 504 failures, so <a class="reference internal" href="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> does <em>not</em> account for failure.</p>
 505 </dd></dl>
 506
 507 <dl class="enumerator">
 508 <dt id="_CPPv4N20memcached_behavior_t23MEMCACHED_BEHAVIOR_CORKE">
 509 <span id="_CPPv3N20memcached_behavior_t23MEMCACHED_BEHAVIOR_CORKE"></span><span id="_CPPv2N20memcached_behavior_t23MEMCACHED_BEHAVIOR_CORKE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_CORK</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t23MEMCACHED_BEHAVIOR_CORKE" title="Permalink to this definition">¶</a><br /></dt>
 510 <dd><div class="deprecated">
 511 <p><span class="versionmodified">Deprecated since version ?: </span>This option has been deprecated with the behavior now built in and
 512 used appropriately on selected platforms.</p>
 513 </div>
 514 </dd></dl>
 515
 516 <dl class="enumerator">
 517 <dt id="_CPPv4N20memcached_behavior_t28MEMCACHED_BEHAVIOR_KEEPALIVEE">
 518 <span id="_CPPv3N20memcached_behavior_t28MEMCACHED_BEHAVIOR_KEEPALIVEE"></span><span id="_CPPv2N20memcached_behavior_t28MEMCACHED_BEHAVIOR_KEEPALIVEE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_KEEPALIVE</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t28MEMCACHED_BEHAVIOR_KEEPALIVEE" title="Permalink to this definition">¶</a><br /></dt>
 519 <dd><p>Enable TCP_KEEPALIVE behavior.</p>
 520 </dd></dl>
 521
 522 <dl class="enumerator">
 523 <dt id="_CPPv4N20memcached_behavior_t33MEMCACHED_BEHAVIOR_KEEPALIVE_IDLEE">
 524 <span id="_CPPv3N20memcached_behavior_t33MEMCACHED_BEHAVIOR_KEEPALIVE_IDLEE"></span><span id="_CPPv2N20memcached_behavior_t33MEMCACHED_BEHAVIOR_KEEPALIVE_IDLEE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_KEEPALIVE_IDLE</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t33MEMCACHED_BEHAVIOR_KEEPALIVE_IDLEE" title="Permalink to this definition">¶</a><br /></dt>
 525 <dd><p>Specify time, in seconds, to mark a connection as idle. This is only
 526 available as an option on Linux.</p>
 527 </dd></dl>
 528
 529 <dl class="enumerator">
 530 <dt id="_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZEE">
 531 <span id="_CPPv3N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZEE"></span><span id="_CPPv2N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZEE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZE</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_SEND_SIZEE" title="Permalink to this definition">¶</a><br /></dt>
 532 <dd><p>Find the current size of SO_SNDBUF. A value of 0 means either an error
 533 occurred or no hosts were available. It is safe to assume system default
 534 if this occurs.</p>
 535 <p>If an error occurs you can check the last cached errno to find the
 536 specific error.</p>
 537 </dd></dl>
 538
 539 <dl class="enumerator">
 540 <dt id="_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZEE">
 541 <span id="_CPPv3N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZEE"></span><span id="_CPPv2N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZEE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZE</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_SOCKET_RECV_SIZEE" title="Permalink to this definition">¶</a><br /></dt>
 542 <dd><p>Find the current size of SO_RCVBUF. A value of 0 means either an error
 543 occurred or no hosts were available. It is safe to assume system default
 544 if this occurs.</p>
 545 <p>If an error occurs you can check the last cached errno to find the
 546 specific error.</p>
 547 </dd></dl>
 548
 549 <dl class="enumerator">
 550 <dt id="_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE">
 551 <span id="_CPPv3N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE"></span><span id="_CPPv2N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE" title="Permalink to this definition">¶</a><br /></dt>
 552 <dd><div class="deprecated">
 553 <p><span class="versionmodified">Deprecated since version 0.48: </span>See <a class="reference internal" href="#_CPPv4N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE" title="memcached_behavior_t::MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS</span></code></a></p>
 554 </div>
 555 <p>Set this value to enable the server be removed after continuous
 556 <a class="reference internal" href="#_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE" title="memcached_behavior_t::MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT</span></code></a> times connection failure.</p>
 557 </dd></dl>
 558
 559 <dl class="enumerator">
 560 <dt id="_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTSE">
 561 <span id="_CPPv3N20memcached_behavior_t35MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTSE"></span><span id="_CPPv2N20memcached_behavior_t35MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTSE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t35MEMCACHED_BEHAVIOR_AUTO_EJECT_HOSTSE" title="Permalink to this definition">¶</a><br /></dt>
 562 <dd><div class="deprecated">
 563 <p><span class="versionmodified">Deprecated since version 0.48: </span>See <a class="reference internal" href="#_CPPv4N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE" title="memcached_behavior_t::MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS</span></code></a></p>
 564 </div>
 565 <p>If enabled any hosts which have been flagged as disabled will be removed
 566 from the list of servers in the <a class="reference internal" href="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. This must be
 567 used in combination with <a class="reference internal" href="#_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMITE" title="memcached_behavior_t::MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_BEHAVIOR_SERVER_FAILURE_LIMIT</span></code></a>.</p>
 568 </dd></dl>
 569
 570 <dl class="enumerator">
 571 <dt id="_CPPv4N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE">
 572 <span id="_CPPv3N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE"></span><span id="_CPPv2N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERS</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t40MEMCACHED_BEHAVIOR_REMOVE_FAILED_SERVERSE" title="Permalink to this definition">¶</a><br /></dt>
 573 <dd><p>If enabled any hosts which have been flagged as disabled will be removed
 574 from the list of servers in the <a class="reference internal" href="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.</p>
 575 </dd></dl>
 576
 577 <dl class="enumerator">
 578 <dt id="_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_RETRY_TIMEOUTE">
 579 <span id="_CPPv3N20memcached_behavior_t32MEMCACHED_BEHAVIOR_RETRY_TIMEOUTE"></span><span id="_CPPv2N20memcached_behavior_t32MEMCACHED_BEHAVIOR_RETRY_TIMEOUTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_RETRY_TIMEOUT</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t32MEMCACHED_BEHAVIOR_RETRY_TIMEOUTE" title="Permalink to this definition">¶</a><br /></dt>
 580 <dd><p>When enabled a host which is problematic will only be checked for usage
 581 based on the amount of time set by this behavior. The value is in
 582 seconds.</p>
 583 </dd></dl>
 584
 585 <dl class="enumerator">
 586 <dt id="_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEYE">
 587 <span id="_CPPv3N20memcached_behavior_t39MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEYE"></span><span id="_CPPv2N20memcached_behavior_t39MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEYE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEY</code><a class="headerlink" href="#_CPPv4N20memcached_behavior_t39MEMCACHED_BEHAVIOR_HASH_WITH_PREFIX_KEYE" title="Permalink to this definition">¶</a><br /></dt>
 588 <dd><p>When enabled the prefix key will be added to the key when determining
 589 server by hash. See <a class="reference internal" href="memcached_callback.html#_CPPv4N20memcached_callback_t28MEMCACHED_CALLBACK_NAMESPACEE" title="MEMCACHED_CALLBACK_NAMESPACE"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_CALLBACK_NAMESPACE</span></code></a> for additional
 590 information.</p>
 591 </dd></dl>
 592
 593 </dd></dl>
 594
 595 <dl class="type">
 596 <dt id="c.memcached_server_distribution_t">
 597 enum <a class="reference internal" href="#c.memcached_server_distribution_t" title="memcached_server_distribution_t">memcached_server_distribution_t</a> <code class="descname">memcached_server_distribution_t</code><a class="headerlink" href="#c.memcached_server_distribution_t" title="Permalink to this definition">¶</a></dt>
 598 <dd></dd></dl>
 599
 600 <dl class="enum">
 601 <dt id="_CPPv431memcached_server_distribution_t">
 602 <span id="_CPPv331memcached_server_distribution_t"></span><span id="_CPPv231memcached_server_distribution_t"></span><em class="property">enum </em><code class="descname">memcached_server_distribution_t</code><a class="headerlink" href="#_CPPv431memcached_server_distribution_t" title="Permalink to this definition">¶</a><br /></dt>
 603 <dd><dl class="enumerator">
 604 <dt id="_CPPv4N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_MODULAE">
 605 <span id="_CPPv3N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_MODULAE"></span><span id="_CPPv2N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_MODULAE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_MODULA</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_MODULAE" title="Permalink to this definition">¶</a><br /></dt>
 606 <dd><p>Distribute keys by hash modulo number of servers.</p>
 607 </dd></dl>
 608
 609 <dl class="enumerator">
 610 <dt id="_CPPv4N31memcached_server_distribution_t33MEMCACHED_DISTRIBUTION_CONSISTENTE">
 611 <span id="_CPPv3N31memcached_server_distribution_t33MEMCACHED_DISTRIBUTION_CONSISTENTE"></span><span id="_CPPv2N31memcached_server_distribution_t33MEMCACHED_DISTRIBUTION_CONSISTENTE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_CONSISTENT</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t33MEMCACHED_DISTRIBUTION_CONSISTENTE" title="Permalink to this definition">¶</a><br /></dt>
 612 <dd><p>Alias for <a class="reference internal" href="#_CPPv4N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE" title="memcached_server_distribution_t::MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA</span></code></a>.</p>
 613 </dd></dl>
 614
 615 <dl class="enumerator">
 616 <dt id="_CPPv4N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE">
 617 <span id="_CPPv3N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE"></span><span id="_CPPv2N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t40MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMAE" title="Permalink to this definition">¶</a><br /></dt>
 618 <dd><p>Unweighted consistent key distribution.</p>
 619 </dd></dl>
 620
 621 <dl class="enumerator">
 622 <dt id="_CPPv4N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_RANDOME">
 623 <span id="_CPPv3N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_RANDOME"></span><span id="_CPPv2N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_RANDOME"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_RANDOM</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t29MEMCACHED_DISTRIBUTION_RANDOME" title="Permalink to this definition">¶</a><br /></dt>
 624 <dd><p>Distribute keys by <em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/3/rand">rand(3)</a></em> modulo number of servers.</p>
 625 </dd></dl>
 626
 627 <dl class="enumerator">
 628 <dt id="_CPPv4N31memcached_server_distribution_t44MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPYE">
 629 <span id="_CPPv3N31memcached_server_distribution_t44MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPYE"></span><span id="_CPPv2N31memcached_server_distribution_t44MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPYE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPY</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t44MEMCACHED_DISTRIBUTION_CONSISTENT_KETAMA_SPYE" title="Permalink to this definition">¶</a><br /></dt>
 630 <dd><p>Unweighted consistent key distribution compatible with the SPY client.</p>
 631 </dd></dl>
 632
 633 <dl class="enumerator">
 634 <dt id="_CPPv4N31memcached_server_distribution_t42MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTEDE">
 635 <span id="_CPPv3N31memcached_server_distribution_t42MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTEDE"></span><span id="_CPPv2N31memcached_server_distribution_t42MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTEDE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTED</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t42MEMCACHED_DISTRIBUTION_CONSISTENT_WEIGHTEDE" title="Permalink to this definition">¶</a><br /></dt>
 636 <dd><p>Weighted consistent key distribution.</p>
 637 </dd></dl>
 638
 639 <dl class="enumerator">
 640 <dt id="_CPPv4N31memcached_server_distribution_t37MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKETE">
 641 <span id="_CPPv3N31memcached_server_distribution_t37MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKETE"></span><span id="_CPPv2N31memcached_server_distribution_t37MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKETE"></span><em class="property">enumerator </em><code class="descname">MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKET</code><a class="headerlink" href="#_CPPv4N31memcached_server_distribution_t37MEMCACHED_DISTRIBUTION_VIRTUAL_BUCKETE" title="Permalink to this definition">¶</a><br /></dt>
 642 <dd><p>Consistent key distribution by virtual buckets.</p>
 643 </dd></dl>
 644
 645 </dd></dl>
 646
 647 </div>
 648 <div class="section" id="description">
 649 <h2>DESCRIPTION<a class="headerlink" href="#description" title="Permalink to this headline">¶</a></h2>
 650 <p><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">libmemcached</span></code> behavior can be modified by using <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a>.
 651 Default behavior is the library strives to be quick and accurate. Some behavior,
 652 while being faster, can also result in not entirely accurate behavior (for
 653 instance, <a class="reference internal" href="memcached_set.html#_CPPv413memcached_setP12memcached_stPKc6size_tPKc6size_t6time_t8uint32_t" title="memcached_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_set()</span></code></a> will always respond with <a class="reference internal" href="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>).</p>
 654 <p><a class="reference internal" href="#_CPPv422memcached_behavior_getP12memcached_st20memcached_behavior_t" title="memcached_behavior_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_get()</span></code></a> takes a behavior <code class="docutils literal notranslate"><span class="pre">flag</span></code> and returns whether or not
 655 that behavior is currently enabled in the client.</p>
 656 <p><a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> changes the value of a particular option of the client.
 657 It takes both a <code class="docutils literal notranslate"><span class="pre">flag</span></code> and a <code class="docutils literal notranslate"><span class="pre">value</span></code>. For simple on or off options you just
 658 need to pass in a value of 1. Calls to <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> will flush and
 659 reset all connections.</p>
 660 </div>
 661 <div class="section" id="return-value">
 662 <h2>RETURN VALUE<a class="headerlink" href="#return-value" title="Permalink to this headline">¶</a></h2>
 663 <p><a class="reference internal" href="#_CPPv422memcached_behavior_getP12memcached_st20memcached_behavior_t" title="memcached_behavior_get"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_get()</span></code></a> returns either the current value of the key, or 0
 664 or 1 on simple flag behaviors (1 being enabled). <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a>
 665 returns failure or success.</p>
 666 </div>
 667 <div class="section" id="notes">
 668 <h2>NOTES<a class="headerlink" href="#notes" title="Permalink to this headline">¶</a></h2>
 669 <p>The <code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">data</span></code> argument of <a class="reference internal" href="#_CPPv422memcached_behavior_setP12memcached_st20memcached_behavior_t8uint64_t" title="memcached_behavior_set"><code class="xref cpp cpp-any docutils literal notranslate"><span class="pre">memcached_behavior_set()</span></code></a> was changed in version
 670 0.17 from taking a pointer to data value, to taking a uin64_t.</p>
 671 </div>
 672 <div class="section" id="see-also">
 673 <h2>SEE ALSO<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
 674 <ul class="simple">
 675 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/1/memcached">memcached(1)</a></em></li>
 676 <li><em class="manpage"><a class="manpage reference external" href="https://linux.die.net/man/3/setsockopt">setsockopt(3)</a></em></li>
 677 <li><a class="reference internal" href="../libmemcached.html"><span class="doc">C/C++ Client Library for memcached</span></a></li>
 678 <li><a class="reference internal" href="memcached_strerror.html"><span class="doc">Converting Error Codes to Messages</span></a></li>
 679 </ul>
 680 </div>
 681 </div>
 682
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