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<title>Apache Portable Runtime Utility Library: Thread Safe FIFO bounded queue</title>
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<h1>Thread Safe FIFO bounded queue<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>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" align="right" valign="top">typedef struct <a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a></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___f_i_f_o.html#ga9c8c5ec3d8779a6c2ffffb8b74f784c7">apr_queue_create</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> **queue, unsigned int queue_capacity, apr_pool_t *a)</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___f_i_f_o.html#ga220fffb8eb2f23aa2fe626b64076df88">apr_queue_push</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue, void *data)</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___f_i_f_o.html#ga302387f5afb71d3c771b76448088bd34">apr_queue_pop</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue, void **data)</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___f_i_f_o.html#gaba8216476d7e5abc3a5ec8a47adf96d5">apr_queue_trypush</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue, void *data)</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___f_i_f_o.html#ga128207222433384f286f61ec806f4af8">apr_queue_trypop</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue, void **data)</td></tr>
<tr><td class="memItemLeft" align="right" valign="top">unsigned int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___a_p_r___util___f_i_f_o.html#gaf342a2e2ec195a30d6d8c9d95fbfbc30">apr_queue_size</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue)</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___f_i_f_o.html#ga8757c7f87105e6ff4cf1ea5ac28dd26f">apr_queue_interrupt_all</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue)</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___f_i_f_o.html#gabb8115bceb96a41df3e21544ce79bc68">apr_queue_term</a> (<a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> *queue)</td></tr>
</table>
<hr/><h2>Typedef Documentation</h2>
<a class="anchor" id="ga8c74c22abf47b63555a2109b06f83abb"></a><!-- doxytag: member="apr_queue.h::apr_queue_t" ref="ga8c74c22abf47b63555a2109b06f83abb" args="" -->
<div class="memitem">
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<tr>
<td class="memname">typedef struct <a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> <a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>opaque structure </p>
</div>
</div>
<hr/><h2>Function Documentation</h2>
<a class="anchor" id="ga9c8c5ec3d8779a6c2ffffb8b74f784c7"></a><!-- doxytag: member="apr_queue.h::apr_queue_create" ref="ga9c8c5ec3d8779a6c2ffffb8b74f784c7" args="(apr_queue_t **queue, unsigned int queue_capacity, apr_pool_t *a)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_create </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> ** </td>
<td class="paramname"> <em>queue</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"> <em>queue_capacity</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">apr_pool_t * </td>
<td class="paramname"> <em>a</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>create a FIFO queue </p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>The new queue </td></tr>
<tr><td valign="top"></td><td valign="top"><em>queue_capacity</em> </td><td>maximum size of the queue </td></tr>
<tr><td valign="top"></td><td valign="top"><em>a</em> </td><td>pool to allocate queue from </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga8757c7f87105e6ff4cf1ea5ac28dd26f"></a><!-- doxytag: member="apr_queue.h::apr_queue_interrupt_all" ref="ga8757c7f87105e6ff4cf1ea5ac28dd26f" args="(apr_queue_t *queue)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_interrupt_all </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>interrupt all the threads blocking on this queue.</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga302387f5afb71d3c771b76448088bd34"></a><!-- doxytag: member="apr_queue.h::apr_queue_pop" ref="ga302387f5afb71d3c771b76448088bd34" args="(apr_queue_t *queue, void **data)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_pop </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void ** </td>
<td class="paramname"> <em>data</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>pop/get an object from the queue, blocking if the queue is already empty</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>the data </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>APR_EINTR the blocking was interrupted (try again) </dd>
<dd>
APR_EOF if the queue has been terminated </dd>
<dd>
APR_SUCCESS on a successful pop </dd></dl>
</div>
</div>
<a class="anchor" id="ga220fffb8eb2f23aa2fe626b64076df88"></a><!-- doxytag: member="apr_queue.h::apr_queue_push" ref="ga220fffb8eb2f23aa2fe626b64076df88" args="(apr_queue_t *queue, void *data)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_push </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>data</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>push/add an object to the queue, blocking if the queue is already full</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>the data </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>APR_EINTR the blocking was interrupted (try again) </dd>
<dd>
APR_EOF the queue has been terminated </dd>
<dd>
APR_SUCCESS on a successful push </dd></dl>
</div>
</div>
<a class="anchor" id="gaf342a2e2ec195a30d6d8c9d95fbfbc30"></a><!-- doxytag: member="apr_queue.h::apr_queue_size" ref="gaf342a2e2ec195a30d6d8c9d95fbfbc30" args="(apr_queue_t *queue)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">unsigned int apr_queue_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>returns the size of the queue.</p>
<dl class="warning"><dt><b>Warning:</b></dt><dd>this is not threadsafe, and is intended for reporting/monitoring of the queue. </dd></dl>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>the size of the queue </dd></dl>
</div>
</div>
<a class="anchor" id="gabb8115bceb96a41df3e21544ce79bc68"></a><!-- doxytag: member="apr_queue.h::apr_queue_term" ref="gabb8115bceb96a41df3e21544ce79bc68" args="(apr_queue_t *queue)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_term </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em></td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>terminate the queue, sending an interrupt to all the blocking threads</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
</table>
</dd>
</dl>
</div>
</div>
<a class="anchor" id="ga128207222433384f286f61ec806f4af8"></a><!-- doxytag: member="apr_queue.h::apr_queue_trypop" ref="ga128207222433384f286f61ec806f4af8" args="(apr_queue_t *queue, void **data)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_trypop </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void ** </td>
<td class="paramname"> <em>data</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>pop/get an object to the queue, returning immediately if the queue is empty</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>the data </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>APR_EINTR the blocking operation was interrupted (try again) </dd>
<dd>
APR_EAGAIN the queue is empty </dd>
<dd>
APR_EOF the queue has been terminated </dd>
<dd>
APR_SUCCESS on a successful push </dd></dl>
</div>
</div>
<a class="anchor" id="gaba8216476d7e5abc3a5ec8a47adf96d5"></a><!-- doxytag: member="apr_queue.h::apr_queue_trypush" ref="gaba8216476d7e5abc3a5ec8a47adf96d5" args="(apr_queue_t *queue, void *data)" -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname">apr_status_t apr_queue_trypush </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___a_p_r___util___f_i_f_o.html#ga8c74c22abf47b63555a2109b06f83abb">apr_queue_t</a> * </td>
<td class="paramname"> <em>queue</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>data</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>push/add an object to the queue, returning immediately if the queue is full</p>
<dl><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>queue</em> </td><td>the queue </td></tr>
<tr><td valign="top"></td><td valign="top"><em>data</em> </td><td>the data </td></tr>
</table>
</dd>
</dl>
<dl class="return"><dt><b>Returns:</b></dt><dd>APR_EINTR the blocking operation was interrupted (try again) </dd>
<dd>
APR_EAGAIN the queue is full </dd>
<dd>
APR_EOF the queue has been terminated </dd>
<dd>
APR_SUCCESS on a successful push </dd></dl>
</div>
</div>
</div>
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