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