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<title>Xenomai API: semaphore.c</title>
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<h1>semaphore.c</h1><div class="fragment"><pre class="fragment"><span class="preprocessor">#include <<a class="code" href="include_2native_2sem_8h.html" title="This file is part of the Xenomai project.">native/sem.h</a>></span>
<span class="preprocessor">#define SEM_INIT 1 </span><span class="comment">/* Initial semaphore count */</span>
<span class="preprocessor">#define SEM_MODE S_FIFO </span><span class="comment">/* Wait by FIFO order */</span>
RT_SEM sem_desc;
<span class="keywordtype">void</span> foo (<span class="keywordtype">void</span>)
{
<span class="keywordtype">int</span> err;
<span class="comment">/* Create a semaphore; we could also have attempted to bind to</span>
<span class="comment"> some pre-existing object, using rt_sem_bind() instead of</span>
<span class="comment"> creating it. */</span>
err = <a name="a0"></a><a class="code" href="group__semaphore.html#gba36e3ac8972ea74feb60640e58d1ceb" title="Create a counting semaphore.">rt_sem_create</a>(&sem_desc,<span class="stringliteral">"MySemaphore"</span>,SEM_INIT,SEM_MODE);
<span class="keywordflow">for</span> (;;) {
<span class="comment">/* Now, wait for a semaphore unit... */</span>
<a name="a1"></a><a class="code" href="group__semaphore.html#gdd299dfe4a53194870bf4e158ca89d1f" title="Pend on a semaphore.">rt_sem_p</a>(&sem_desc,TM_INFINITE);
<span class="comment">/* ... */</span>
<span class="comment">/* then release it. */</span>
<a name="a2"></a><a class="code" href="group__semaphore.html#ga5a7927862a511a27741223e08e48270" title="Signal a semaphore.">rt_sem_v</a>(&sem_desc);
<span class="comment">/* ... */</span>
}
}
<span class="keywordtype">void</span> cleanup (<span class="keywordtype">void</span>)
{
<a name="a3"></a><a class="code" href="group__semaphore.html#ga14cefc4dae46a7c95859e7fe46df888" title="Delete a semaphore.">rt_sem_delete</a>(&sem_desc);
}
</pre></div> </div>
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