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<h1>mainloop.h File Reference</h1>A minimal main loop implementation based on the C library's poll() function.
<a href="#_details">More...</a>
<p>
<p>
<a href="mainloop_8h-source.html">Go to the source code of this file.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Typedefs</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef struct <a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a></td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">An opaque main loop object. <a href="#adf8d428d3e2f00ed762017c7b587cc9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">typedef int(* </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#be53a62e351d3f15f865fb20973b3ce1">pa_poll_func</a> )(struct pollfd *ufds, unsigned long nfds, int timeout, void *userdata)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Generic prototype of a poll() like function. <a href="#be53a62e351d3f15f865fb20973b3ce1"></a><br></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#d6c767781474275159c0a5f3f7e2ecb5">pa_mainloop_new</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Allocate a new main loop object. <a href="#d6c767781474275159c0a5f3f7e2ecb5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#6c6ea37ce2815640f7f1a133f845f8e7">pa_mainloop_free</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Free a main loop object. <a href="#6c6ea37ce2815640f7f1a133f845f8e7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#217ce134af601c1c6ce77c41c99fc0d2">pa_mainloop_prepare</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m, int timeout)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Prepare for a single iteration of the main loop. <a href="#217ce134af601c1c6ce77c41c99fc0d2"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#9195049c1bd136be73ce0e628523a2df">pa_mainloop_poll</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Execute the previously prepared poll. <a href="#9195049c1bd136be73ce0e628523a2df"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#bada884366e125a052bae5f6a4a7481e">pa_mainloop_dispatch</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Dispatch timeout, io and deferred events from the previously executed poll. <a href="#bada884366e125a052bae5f6a4a7481e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#70065fd3ab808bde3892bf08a8c5f51b">pa_mainloop_get_retval</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the return value as specified with the main loop's quit() routine. <a href="#70065fd3ab808bde3892bf08a8c5f51b"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#491422aebe5487800d8be0bf4153cb81">pa_mainloop_iterate</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m, int block, int *retval)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Run a single iteration of the main loop. <a href="#491422aebe5487800d8be0bf4153cb81"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#fbcd8f4eba09cdfd5323ac9db3718ae8">pa_mainloop_run</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m, int *retval)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Run unlimited iterations of the main loop object until the main loop's quit() routine is called. <a href="#fbcd8f4eba09cdfd5323ac9db3718ae8"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="structpa__mainloop__api.html">pa_mainloop_api</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#9e5b510dabb4eb1a01645c4db65b9ddb">pa_mainloop_get_api</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the abstract main loop abstraction layer vtable for this main loop. <a href="#9e5b510dabb4eb1a01645c4db65b9ddb"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#906bbc80037677a05a1dc73a33a30a44">pa_mainloop_quit</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m, int r)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Shutdown the main loop. <a href="#906bbc80037677a05a1dc73a33a30a44"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#2a81af2882e0c806308b20b97ca5473e">pa_mainloop_wakeup</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Interrupt a running poll (for threaded systems). <a href="#2a81af2882e0c806308b20b97ca5473e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="mainloop_8h.html#e51c490c29106c0c3b020020c6dc015d">pa_mainloop_set_poll_func</a> (<a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> *m, <a class="el" href="mainloop_8h.html#be53a62e351d3f15f865fb20973b3ce1">pa_poll_func</a> poll_func, void *userdata)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Change the poll() implementation. <a href="#e51c490c29106c0c3b020020c6dc015d"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A minimal main loop implementation based on the C library's poll() function.
<p>
Using the routines defined herein you may create a simple main loop supporting the generic main loop abstraction layer as defined in <a class="el" href="mainloop-api_8h.html">mainloop-api.h</a>. This implementation is thread safe as long as you access the main loop object from a single thread only. <hr><h2>Typedef Documentation</h2>
<a class="anchor" name="adf8d428d3e2f00ed762017c7b587cc9"></a><!-- doxytag: member="mainloop.h::pa_mainloop" ref="adf8d428d3e2f00ed762017c7b587cc9" args="" -->
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<td class="memname">typedef struct <a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> <a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> </td>
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<p>
An opaque main loop object.
<p>
<dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="pacat_8c-example.html#a91">pacat.c</a>, and <a class="el" href="paplay_8c-example.html#a43">paplay.c</a>.</dl>
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<a class="anchor" name="be53a62e351d3f15f865fb20973b3ce1"></a><!-- doxytag: member="mainloop.h::pa_poll_func" ref="be53a62e351d3f15f865fb20973b3ce1" args=")(struct pollfd *ufds, unsigned long nfds, int timeout, void *userdata)" -->
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<td class="memname">typedef int(* <a class="el" href="mainloop_8h.html#be53a62e351d3f15f865fb20973b3ce1">pa_poll_func</a>)(struct pollfd *ufds, unsigned long nfds, int timeout, void *userdata) </td>
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<p>
Generic prototype of a poll() like function.
<p>
</div>
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<hr><h2>Function Documentation</h2>
<a class="anchor" name="bada884366e125a052bae5f6a4a7481e"></a><!-- doxytag: member="mainloop.h::pa_mainloop_dispatch" ref="bada884366e125a052bae5f6a4a7481e" args="(pa_mainloop *m)" -->
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<td class="memname">int pa_mainloop_dispatch </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em> </td>
<td> ) </td>
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<p>
Dispatch timeout, io and deferred events from the previously executed poll.
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Returns a negative value on error. On success returns the number of source dispatched.
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<a class="anchor" name="6c6ea37ce2815640f7f1a133f845f8e7"></a><!-- doxytag: member="mainloop.h::pa_mainloop_free" ref="6c6ea37ce2815640f7f1a133f845f8e7" args="(pa_mainloop *m)" -->
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<td class="memname">void pa_mainloop_free </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em> </td>
<td> ) </td>
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<p>
Free a main loop object.
<p>
<dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="pacat_8c-example.html#a119">pacat.c</a>, and <a class="el" href="paplay_8c-example.html#a70">paplay.c</a>.</dl>
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<a class="anchor" name="9e5b510dabb4eb1a01645c4db65b9ddb"></a><!-- doxytag: member="mainloop.h::pa_mainloop_get_api" ref="9e5b510dabb4eb1a01645c4db65b9ddb" args="(pa_mainloop *m)" -->
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<td class="memname"><a class="el" href="structpa__mainloop__api.html">pa_mainloop_api</a>* pa_mainloop_get_api </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em> </td>
<td> ) </td>
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<p>
Return the abstract main loop abstraction layer vtable for this main loop.
<p>
<dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="pacat_8c-example.html#a107">pacat.c</a>, and <a class="el" href="paplay_8c-example.html#a61">paplay.c</a>.</dl>
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<a class="anchor" name="70065fd3ab808bde3892bf08a8c5f51b"></a><!-- doxytag: member="mainloop.h::pa_mainloop_get_retval" ref="70065fd3ab808bde3892bf08a8c5f51b" args="(pa_mainloop *m)" -->
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<td class="memname">int pa_mainloop_get_retval </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em> </td>
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<p>
Return the return value as specified with the main loop's quit() routine.
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<a class="anchor" name="491422aebe5487800d8be0bf4153cb81"></a><!-- doxytag: member="mainloop.h::pa_mainloop_iterate" ref="491422aebe5487800d8be0bf4153cb81" args="(pa_mainloop *m, int block, int *retval)" -->
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<td class="memname">int pa_mainloop_iterate </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>block</em>, </td>
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<td class="paramtype">int * </td>
<td class="paramname"> <em>retval</em></td><td> </td>
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<p>
Run a single iteration of the main loop.
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This is a convenience function for <a class="el" href="mainloop_8h.html#217ce134af601c1c6ce77c41c99fc0d2" title="Prepare for a single iteration of the main loop.">pa_mainloop_prepare()</a>, <a class="el" href="mainloop_8h.html#9195049c1bd136be73ce0e628523a2df" title="Execute the previously prepared poll.">pa_mainloop_poll()</a> and <a class="el" href="mainloop_8h.html#bada884366e125a052bae5f6a4a7481e" title="Dispatch timeout, io and deferred events from the previously executed poll.">pa_mainloop_dispatch()</a>. Returns a negative value on error or exit request. If block is nonzero, block for events if none are queued. Optionally return the return value as specified with the main loop's quit() routine in the integer variable retval points to. On success returns the number of sources dispatched in this iteration.
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<a class="anchor" name="d6c767781474275159c0a5f3f7e2ecb5"></a><!-- doxytag: member="mainloop.h::pa_mainloop_new" ref="d6c767781474275159c0a5f3f7e2ecb5" args="(void)" -->
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<td class="memname"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a>* pa_mainloop_new </td>
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<p>
Allocate a new main loop object.
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<dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="pacat_8c-example.html#a106">pacat.c</a>, and <a class="el" href="paplay_8c-example.html#a60">paplay.c</a>.</dl>
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<a class="anchor" name="9195049c1bd136be73ce0e628523a2df"></a><!-- doxytag: member="mainloop.h::pa_mainloop_poll" ref="9195049c1bd136be73ce0e628523a2df" args="(pa_mainloop *m)" -->
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<td class="memname">int pa_mainloop_poll </td>
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<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
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<p>
Execute the previously prepared poll.
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Returns a negative value on error.
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<a class="anchor" name="217ce134af601c1c6ce77c41c99fc0d2"></a><!-- doxytag: member="mainloop.h::pa_mainloop_prepare" ref="217ce134af601c1c6ce77c41c99fc0d2" args="(pa_mainloop *m, int timeout)" -->
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<td class="memname">int pa_mainloop_prepare </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
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<td class="paramtype">int </td>
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Prepare for a single iteration of the main loop.
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Returns a negative value on error or exit request. timeout specifies a maximum timeout for the subsequent poll, or -1 for blocking behaviour. .
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<a class="anchor" name="906bbc80037677a05a1dc73a33a30a44"></a><!-- doxytag: member="mainloop.h::pa_mainloop_quit" ref="906bbc80037677a05a1dc73a33a30a44" args="(pa_mainloop *m, int r)" -->
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<td class="memname">void pa_mainloop_quit </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em>, </td>
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<td class="paramtype">int </td>
<td class="paramname"> <em>r</em></td><td> </td>
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<p>
Shutdown the main loop.
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<a class="anchor" name="fbcd8f4eba09cdfd5323ac9db3718ae8"></a><!-- doxytag: member="mainloop.h::pa_mainloop_run" ref="fbcd8f4eba09cdfd5323ac9db3718ae8" args="(pa_mainloop *m, int *retval)" -->
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<td class="memname">int pa_mainloop_run </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em>, </td>
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<td class="paramtype">int * </td>
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<p>
Run unlimited iterations of the main loop object until the main loop's quit() routine is called.
<p>
<dl compact><dt><b>Examples: </b></dt><dd>
<a class="el" href="pacat_8c-example.html#a115">pacat.c</a>, and <a class="el" href="paplay_8c-example.html#a67">paplay.c</a>.</dl>
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<a class="anchor" name="e51c490c29106c0c3b020020c6dc015d"></a><!-- doxytag: member="mainloop.h::pa_mainloop_set_poll_func" ref="e51c490c29106c0c3b020020c6dc015d" args="(pa_mainloop *m, pa_poll_func poll_func, void *userdata)" -->
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<td class="memname">void pa_mainloop_set_poll_func </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#be53a62e351d3f15f865fb20973b3ce1">pa_poll_func</a> </td>
<td class="paramname"> <em>poll_func</em>, </td>
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<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"> <em>userdata</em></td><td> </td>
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<td></td>
<td>)</td>
<td></td><td></td><td></td>
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<p>
Change the poll() implementation.
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<a class="anchor" name="2a81af2882e0c806308b20b97ca5473e"></a><!-- doxytag: member="mainloop.h::pa_mainloop_wakeup" ref="2a81af2882e0c806308b20b97ca5473e" args="(pa_mainloop *m)" -->
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<td class="memname">void pa_mainloop_wakeup </td>
<td>(</td>
<td class="paramtype"><a class="el" href="mainloop_8h.html#adf8d428d3e2f00ed762017c7b587cc9">pa_mainloop</a> * </td>
<td class="paramname"> <em>m</em> </td>
<td> ) </td>
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<p>
Interrupt a running poll (for threaded systems).
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<hr size="1"><address style="text-align: right;"><small>Generated on Wed Sep 2 04:18:20 2009 for PulseAudio by
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Mandriva
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media
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main-testing
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