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<title>Apache Portable Runtime Utility Library: Resource List Routines</title>
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<h1>Resource List Routines<br/>
<small>
[<a class="el" href="group___a_p_r___util.html">APR Utility Functions</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td colspan="2"><h2>Defines</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gae442d99e6a2eef4a4957f0360822fcac">APR_RESLIST_CLEANUP_DEFAULT</a> 0</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">#define </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gad93b2c229d154c8f6a5c9dfcd7488756">APR_RESLIST_CLEANUP_FIRST</a> 1</td></tr>
<tr><td colspan="2"><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a></td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="gab43e73c2fb526476d3e56d51f5aa214c"></a><!-- doxytag: member="APR_Util_RL::apr_reslist_constructor" ref="gab43e73c2fb526476d3e56d51f5aa214c" args=")(void **resource, void *params, apr_pool_t *pool)" -->
typedef apr_status_t(* </td><td class="memItemRight" valign="bottom"><b>apr_reslist_constructor</b> )(void **resource, void *params, apr_pool_t *pool)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top"><a class="anchor" id="ga60813240d319787f0430ae3171af838a"></a><!-- doxytag: member="APR_Util_RL::apr_reslist_destructor" ref="ga60813240d319787f0430ae3171af838a" args=")(void *resource, void *params, apr_pool_t *pool)" -->
typedef apr_status_t(* </td><td class="memItemRight" valign="bottom"><b>apr_reslist_destructor</b> )(void *resource, void *params, apr_pool_t *pool)</td></tr>
<tr><td colspan="2"><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#ga608ebcddce542603a7f1d3cf51ae8d3c">apr_reslist_create</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> **reslist, int min, int smax, int hmax, apr_interval_time_t ttl, apr_reslist_constructor con, apr_reslist_destructor de, void *params, apr_pool_t *pool)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#ga103e0cbac6c5da7cb93d4e52799233cb">apr_reslist_destroy</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gadfbb592b31ff9215f45d3280636e41d7">apr_reslist_acquire</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist, void **resource)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gaf65ca1701994a0323df639cdb4a8d8b2">apr_reslist_release</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist, void *resource)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gafe06c964d04a568f2625fb5a9ba7bad6">apr_reslist_timeout_set</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist, apr_interval_time_t timeout)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gac37fbbcbc8a98ba9ed017638a2c6c1b7">apr_reslist_acquired_count</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#ga346c0604115a9659cf23ed0cc781f7a9">apr_reslist_invalidate</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist, void *resource)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">apr_status_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#gaa13a7724a30b5a37ac13548bd8dc56f6">apr_reslist_maintain</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___r_l.html#ga7e8adfc4b12ffb63c6795d8d79ee5e95">apr_reslist_cleanup_order_set</a> (<a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> *reslist, apr_uint32_t mode)</td></tr>
</table>
<hr/><h2>Define Documentation</h2>
<a class="anchor" id="gae442d99e6a2eef4a4957f0360822fcac"></a><!-- doxytag: member="apr_reslist.h::APR_RESLIST_CLEANUP_DEFAULT" ref="gae442d99e6a2eef4a4957f0360822fcac" args="" -->
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<td class="memname">#define APR_RESLIST_CLEANUP_DEFAULT 0</td>
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<p>default pool cleanup </p>
</div>
</div>
<a class="anchor" id="gad93b2c229d154c8f6a5c9dfcd7488756"></a><!-- doxytag: member="apr_reslist.h::APR_RESLIST_CLEANUP_FIRST" ref="gad93b2c229d154c8f6a5c9dfcd7488756" args="" -->
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<td class="memname">#define APR_RESLIST_CLEANUP_FIRST 1</td>
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<p>use pool pre cleanup </p>
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<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="ga670f6719dfeffe1037e063eaab7b82ac"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_t" ref="ga670f6719dfeffe1037e063eaab7b82ac" args="" -->
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<td class="memname">typedef struct <a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> <a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a></td>
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<div class="memdoc">
<p>Opaque resource list object </p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="gadfbb592b31ff9215f45d3280636e41d7"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_acquire" ref="gadfbb592b31ff9215f45d3280636e41d7" args="(apr_reslist_t *reslist, void **resource)" -->
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<td class="memname">apr_status_t apr_reslist_acquire </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
<td class="paramname"> <em>reslist</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void ** </td>
<td class="paramname"> <em>resource</em></td><td> </td>
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<p>Retrieve a resource from the list, creating a new one if necessary. If we have met our maximum number of resources, we will block until one becomes available. </p>
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<a class="anchor" id="gac37fbbcbc8a98ba9ed017638a2c6c1b7"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_acquired_count" ref="gac37fbbcbc8a98ba9ed017638a2c6c1b7" args="(apr_reslist_t *reslist)" -->
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<td class="memname">apr_uint32_t apr_reslist_acquired_count </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
<td class="paramname"> <em>reslist</em></td>
<td> ) </td>
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<p>Return the number of outstanding resources. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>reslist</em> </td><td>The resource list. </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga7e8adfc4b12ffb63c6795d8d79ee5e95"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_cleanup_order_set" ref="ga7e8adfc4b12ffb63c6795d8d79ee5e95" args="(apr_reslist_t *reslist, apr_uint32_t mode)" -->
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<td class="memname">void apr_reslist_cleanup_order_set </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
<td class="paramname"> <em>reslist</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_uint32_t </td>
<td class="paramname"> <em>mode</em></td><td> </td>
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<p>Set reslist cleanup order. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>reslist</em> </td><td>The resource list. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>mode</em> </td><td>Cleanup order mode </p>
<pre>
APR_RESLIST_CLEANUP_DEFAULT default pool cleanup order
APR_RESLIST_CLEANUP_FIRST use pool pre cleanup
</pre> </td></tr>
</table>
</dd>
</dl>
<dl class="remark"><dt><b>Remarks:</b></dt><dd>If APR_RESLIST_CLEANUP_FIRST is used the destructors will be called before child pools of the pool used to create the reslist are destroyed. This allows to explicitly destroy the child pools inside reslist destructors. </dd></dl>
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<a class="anchor" id="ga608ebcddce542603a7f1d3cf51ae8d3c"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_create" ref="ga608ebcddce542603a7f1d3cf51ae8d3c" args="(apr_reslist_t **reslist, int min, int smax, int hmax, apr_interval_time_t ttl, apr_reslist_constructor con, apr_reslist_destructor de, void *params, apr_pool_t *pool)" -->
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<td class="memname">apr_status_t apr_reslist_create </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> ** </td>
<td class="paramname"> <em>reslist</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>min</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>smax</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>hmax</em>, </td>
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<td class="paramtype">apr_interval_time_t </td>
<td class="paramname"> <em>ttl</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">apr_reslist_constructor </td>
<td class="paramname"> <em>con</em>, </td>
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<td class="paramtype">apr_reslist_destructor </td>
<td class="paramname"> <em>de</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">void * </td>
<td class="paramname"> <em>params</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">apr_pool_t * </td>
<td class="paramname"> <em>pool</em></td><td> </td>
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<p>Create a new resource list with the following parameters: </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>reslist</em> </td><td>An address where the pointer to the new resource list will be stored. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>min</em> </td><td>Allowed minimum number of available resources. Zero creates new resources only when needed. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>smax</em> </td><td>Resources will be destroyed during reslist maintenance to meet this maximum restriction as they expire (reach their ttl). </td></tr>
<tr><td valign="top"></td><td valign="top"><em>hmax</em> </td><td>Absolute maximum limit on the number of total resources. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>ttl</em> </td><td>If non-zero, sets the maximum amount of time in microseconds an unused resource is valid. Any resource which has exceeded this time will be destroyed, either when encountered by <a class="el" href="group___a_p_r___util___r_l.html#gadfbb592b31ff9215f45d3280636e41d7">apr_reslist_acquire()</a> or during reslist maintenance. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>con</em> </td><td>Constructor routine that is called to create a new resource. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>de</em> </td><td>Destructor routine that is called to destroy an expired resource. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>params</em> </td><td>Passed to constructor and deconstructor </td></tr>
<tr><td valign="top"></td><td valign="top"><em>pool</em> </td><td>The pool from which to create this resource list. Also the same pool that is passed to the constructor and destructor routines. </td></tr>
</table>
</dd>
</dl>
<dl class="remark"><dt><b>Remarks:</b></dt><dd>If APR has been compiled without thread support, hmax will be automatically set to 1 and values of min and smax will be forced to 1 for any non-zero value. </dd></dl>
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<a class="anchor" id="ga103e0cbac6c5da7cb93d4e52799233cb"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_destroy" ref="ga103e0cbac6c5da7cb93d4e52799233cb" args="(apr_reslist_t *reslist)" -->
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<p>Destroy the given resource list and all resources controlled by this list. FIXME: Should this block until all resources become available, or maybe just destroy all the free ones, or maybe destroy them even though they might be in use by something else? Currently it will abort if there are resources that haven't been released, so there is an assumption that all resources have been released to the list before calling this function. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>reslist</em> </td><td>The reslist to destroy </td></tr>
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<a class="anchor" id="ga346c0604115a9659cf23ed0cc781f7a9"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_invalidate" ref="ga346c0604115a9659cf23ed0cc781f7a9" args="(apr_reslist_t *reslist, void *resource)" -->
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<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
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<p>Invalidate a resource in the pool - e.g. a database connection that returns a "lost connection" error and can't be restored. Use this instead of apr_reslist_release if the resource is bad. </p>
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<a class="anchor" id="gaa13a7724a30b5a37ac13548bd8dc56f6"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_maintain" ref="gaa13a7724a30b5a37ac13548bd8dc56f6" args="(apr_reslist_t *reslist)" -->
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<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
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<p>Perform routine maintenance on the resource list. This call may instantiate new resources or expire old resources. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>reslist</em> </td><td>The resource list. </td></tr>
</table>
</dd>
</dl>
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<a class="anchor" id="gaf65ca1701994a0323df639cdb4a8d8b2"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_release" ref="gaf65ca1701994a0323df639cdb4a8d8b2" args="(apr_reslist_t *reslist, void *resource)" -->
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<td class="memname">apr_status_t apr_reslist_release </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
<td class="paramname"> <em>reslist</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>resource</em></td><td> </td>
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<td>)</td>
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<p>Return a resource back to the list of available resources. </p>
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<a class="anchor" id="gafe06c964d04a568f2625fb5a9ba7bad6"></a><!-- doxytag: member="apr_reslist.h::apr_reslist_timeout_set" ref="gafe06c964d04a568f2625fb5a9ba7bad6" args="(apr_reslist_t *reslist, apr_interval_time_t timeout)" -->
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<td class="memname">void apr_reslist_timeout_set </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___r_l.html#ga670f6719dfeffe1037e063eaab7b82ac">apr_reslist_t</a> * </td>
<td class="paramname"> <em>reslist</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype">apr_interval_time_t </td>
<td class="paramname"> <em>timeout</em></td><td> </td>
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<p>Set the timeout the acquire will wait for a free resource when the maximum number of resources is exceeded. </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>reslist</em> </td><td>The resource list. </td></tr>
<tr><td valign="top"></td><td valign="top"><em>timeout</em> </td><td>Timeout to wait. The zero waits forever. </td></tr>
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</dd>
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