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<title>Xenomai API: cond_var.c</title>
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<h1>cond_var.c</h1><div class="fragment"><pre class="fragment"><span class="preprocessor">#include <<a class="code" href="include_2native_2mutex_8h.html" title="This file is part of the Xenomai project.">native/mutex.h</a>></span>
<span class="preprocessor">#include <<a class="code" href="include_2native_2cond_8h.html" title="This file is part of the Xenomai project.">native/cond.h</a>></span>
RT_COND cond_desc;
RT_MUTEX mutex_desc;
<span class="keywordtype">int</span> shared_event = 0;
<span class="keywordtype">void</span> foo (<span class="keywordtype">void</span>)
{
<span class="keywordtype">int</span> err;
<span class="comment">/* Create a condition variable and a mutex guarding it; we could</span>
<span class="comment"> also have attempted to bind to some pre-existing objects, using</span>
<span class="comment"> rt_cond_bind() and rt_mutex_bind() instead of creating them. */</span>
err = <a name="a0"></a><a class="code" href="group__mutex.html#gc89c13a781e4636acf9e66f02d9feb83" title="Create a mutex.">rt_mutex_create</a>(&mutex_desc,<span class="stringliteral">"MyCondMutex"</span>);
err = <a name="a1"></a><a class="code" href="group__cond.html#g04646a121e57765848eb2a51ed6be855" title="Create a condition variable.">rt_cond_create</a>(&cond_desc,<span class="stringliteral">"MyCondVar"</span>);
<span class="comment">/* Now, wait for some task to post the shared event... */</span>
<a name="a2"></a><a class="code" href="group__mutex.html#g8a087d5bfeaaf10b6f0a924b272d72c9" title="Acquire a mutex.">rt_mutex_acquire</a>(&mutex_desc,TM_INFINITE);
<span class="keywordflow">while</span> (!shared_event && !err)
err = <a name="a3"></a><a class="code" href="group__cond.html#g3aa51073817be2ffb2a880a7393502e8" title="Wait on a condition.">rt_cond_wait</a>(&cond_desc,&mutex_desc,TM_INFINITE);
<a name="a4"></a><a class="code" href="group__mutex.html#gc87911b7279f55ef2f5f9aefe36ff070" title="Unlock mutex.">rt_mutex_release</a>(&mutex_desc);
<span class="comment">/* ... */</span>
}
<span class="keywordtype">void</span> bar (<span class="keywordtype">void</span>)
{
<span class="comment">/* ... */</span>
<span class="comment">/* Post the shared event. */</span>
<a class="code" href="group__mutex.html#g8a087d5bfeaaf10b6f0a924b272d72c9" title="Acquire a mutex.">rt_mutex_acquire</a>(&mutex_desc,TM_INFINITE);
shared_event = 1;
<a name="a5"></a><a class="code" href="group__cond.html#gb7a59ee47db48a78ca45e4655b569dc9" title="Signal a condition variable.">rt_cond_signal</a>(&cond_desc);
<a class="code" href="group__mutex.html#gc87911b7279f55ef2f5f9aefe36ff070" title="Unlock mutex.">rt_mutex_release</a>(&mutex_desc);
<span class="comment">/* ... */</span>
}
<span class="keywordtype">void</span> cleanup (<span class="keywordtype">void</span>)
{
<a name="a6"></a><a class="code" href="group__cond.html#gba59b188f10b142b4f2500dd719aa35f" title="Delete a condition variable.">rt_cond_delete</a>(&cond_desc);
<a name="a7"></a><a class="code" href="group__mutex.html#gd0c2342227f821bd09f580b6a9684179" title="Delete a mutex.">rt_mutex_delete</a>(&mutex_desc);
}
</pre></div> </div>
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