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<title>Xenomai API: Clock Services</title>
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<h1>Clock Services<br>
<small>
[<a class="el" href="group__driverapi.html">Driver Development API</a>]</small>
</h1>
<p>
<div class="dynheader">
Collaboration diagram for Clock Services:</div>
<div class="dynsection">
<center><table><tr><td><img src="group__clock.png" border="0" alt="" usemap="#group____clock_map">
<map name="group____clock_map">
<area shape="rect" href="group__driverapi.html" title="Driver Development API" alt="" coords="5,5,179,32"></map></td></tr></table></center>
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<p>
<table border="0" cellpadding="0" cellspacing="0">
<tr><td></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="group__rtdm.html#gd3b24c25feabadba465f8797d8c7fe27">nanosecs_abs_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__clock.html#g6cca1db0fd4c207ad92cdc9e9442afa5">rtdm_clock_read</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get system time. <a href="#g6cca1db0fd4c207ad92cdc9e9442afa5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="group__rtdm.html#gd3b24c25feabadba465f8797d8c7fe27">nanosecs_abs_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__clock.html#g861a79090031b981c627107248cf2d14">rtdm_clock_read_monotonic</a> (void)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get monotonic time. <a href="#g861a79090031b981c627107248cf2d14"></a><br></td></tr>
</table>
<hr><h2>Function Documentation</h2>
<a class="anchor" name="g6cca1db0fd4c207ad92cdc9e9442afa5"></a><!-- doxytag: member="drvlib.c::rtdm_clock_read" ref="g6cca1db0fd4c207ad92cdc9e9442afa5" args="(void)" -->
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<td class="memname"><a class="el" href="group__rtdm.html#gd3b24c25feabadba465f8797d8c7fe27">nanosecs_abs_t</a> rtdm_clock_read </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
</tr>
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<p>
Get system time.
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The system time in nanoseconds is returned</dd></dl>
<dl class="note" compact><dt><b>Note:</b></dt><dd>The resolution of this service depends on the system timer. In particular, if the system timer is running in periodic mode, the return value will be limited to multiples of the timer tick period.<p>
The system timer may have to be started to obtain valid results. Whether this happens automatically (as on Xenomai) or is controlled by the application depends on the RTDM host environment.</dd></dl>
Environments:<p>
This service can be called from:<p>
<ul>
<li>Kernel module initialization/cleanup code</li><li>Interrupt service routine</li><li>Kernel-based task</li><li>User-space task (RT, non-RT)</li></ul>
<p>
Rescheduling: never.
</div>
</div><p>
<a class="anchor" name="g861a79090031b981c627107248cf2d14"></a><!-- doxytag: member="drvlib.c::rtdm_clock_read_monotonic" ref="g861a79090031b981c627107248cf2d14" args="(void)" -->
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<td class="memname"><a class="el" href="group__rtdm.html#gd3b24c25feabadba465f8797d8c7fe27">nanosecs_abs_t</a> rtdm_clock_read_monotonic </td>
<td>(</td>
<td class="paramtype">void </td>
<td class="paramname"> </td>
<td> ) </td>
<td></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Get monotonic time.
<p>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The monotonic time in nanoseconds is returned</dd></dl>
<dl class="note" compact><dt><b>Note:</b></dt><dd>The resolution of this service depends on the system timer. In particular, if the system timer is running in periodic mode, the return value will be limited to multiples of the timer tick period.<p>
The system timer may have to be started to obtain valid results. Whether this happens automatically (as on Xenomai) or is controlled by the application depends on the RTDM host environment.</dd></dl>
Environments:<p>
This service can be called from:<p>
<ul>
<li>Kernel module initialization/cleanup code</li><li>Interrupt service routine</li><li>Kernel-based task</li><li>User-space task (RT, non-RT)</li></ul>
<p>
Rescheduling: never.
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