libs67.htm

来自「ST20 Embedded Toolset R2.0.5用于开发基于ST20芯片」· HTM 代码 · 共 159 行

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<title>message_claim</title>

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<h2>
  <a name="1207599"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">message_claim</font>
</h2><hr>


<p>
  <a name="1207600"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">Claim a message buffer</font>
</p>


<h3>
  <a name="1207601"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Synopsis</font>
</h3>


<a name="1207604"> </a><font size=2 face=Courier><strong>#include &lt;message.h&gt;<br></strong></font>



<a name="1271199"> </a><font size=2 face=Courier><strong>void* message_claim( message_queue_t* <font size=2 face=Courier><strong><em>queue</em></strong></font> );<br></strong></font>



<h3>
  <a name="1207606"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Arguments</font>
</h3>


<p>
  <a name="1232508"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><b><font size=2 face=Courier><strong>message_queue_t* </strong></font><font size=2 face=Courier><strong><em>queue</em></strong></font></b></font>
<br>

<dl><dl>    <dl>
      <dt> <a name="1232510"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The message queue from which the message is claimed</font>
    </dl>
</dl></dl>
<h3>
  <a name="1207609"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Results</font>
</h3>


<p>
  <a name="1207610"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">The next available message buffer.</font>
</p>


<h3>
  <a name="1207611"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Errors</font>
</h3>


<p>
  <a name="1207612"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif">None</font>
</p>


<h3>
  <a name="1207613"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Description</font>
</h3>


<p>
  <a name="1207614"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>message_claim()</strong></font> claims the next available message buffer from the message queue, and returns its address. If no message buffers are currently available then the task blocks until one becomes available (by another task calling <font size=2 face=Courier><strong>message_release()</strong></font>).</font>
</p>


<h3>
  <a name="1207615"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">Callable from</font>
</h3>


<p>
  <a name="1207616"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><strong>For non-timeout queues</strong>, this function is callable from a task or a high priority process (on an ST20C2).</font>
</p>


<p>
  <a name="1207618"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><strong>For timeout queues</strong>, this function is callable from tasks only.</font>
</p>


<h3>
  <a name="1207620"> </a><font color="#003366"  face="Verdana, Arial, Helvetica, sans-serif">See also</font>
</h3>


<p>
  <a name="1207621"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"><a href="libs74.htm#1207795"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>message_receive</i></font></a>, <a href="libs76.htm#1207850"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>message_release</i></font></a>, <a href="libs77.htm#1207875"><font  color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>message_send</i></font></a></font>
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<p>
  <a name="1207622"> </a><font size=2  face="Verdana, Arial, Helvetica, sans-serif"></font>
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