help/info/clear.html

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  13 <title>clear</title>
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  32 <h1>clear</h1>
  33 <hr align="left" width="75%">
  34 <p>The keyword is used to remove the contents of the incoming queue of the specified communication port.
  35 <ul>
  36   <li>The operation is valid for both message and procedure based ports.</li>
  37   <li>It is possible to clear all defined ports.</li>
  38   <li>If the port queue is already empty then this operation has no action.</li>
  39 </ul>
  40 <p>Related keywords:</p>
  41 <ul>
  42   <li><a href="all.html"><b><font face="Courier New" color="#003258" size="4">all</font></b></a></li>
  43   <li><a href="port.html"><b><font face="Courier New" color="#003258" size="4">port</font></b></a></li>
  44 </ul>
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  49   <tr>
  50     <td width="100%">
  51     <h3 align="center"><i>port_reference</i><font face="Courier New" color="#003258" size="5"><b>.clear;</b></font></h3>
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  54 </table>
  55 </center>
  56 </div>
  57 <ul>
  58   <li>
  59   <p><i> port_reference</i> points out the port to be cleared.</p>
  60   <ul>
  61     <li>
  62     <p>the keywords <b><font face="Courier New" color="#003258" size="4">all port</font> </b> may be used to indicate that all defined ports must be cleared (see the <a href="#Example 2">example
  63     2</a>).</p>
  64     </li>
  65   </ul>
  66   </li>
  67   <li>
  68   <p>The <b><font face="Courier New" color="#003258" size="4">clear</font> </b> keyword introduces port cleansing.</p>
  69   </li>
  70 </ul>
  71 <hr align="left" width="50%">
  72 <p>Example 1:
  73 <p><font face="Courier New">Kapu_PCO.clear;</font>
  74 <p>The port Kapu_PCO will be cleared.</p>
  75 <hr align="left" width="50%">
  76 <p><a name="Example 2">Example 2</a>:
  77 <p><font face="Courier New">all port.clear;</font>
  78 <p>The incoming queues of all defined ports will be emptied.</p>
  79 <hr align="left" width="25%">
  80 <hr align="left" width="25%">
  81 <p><a HREF="BNF.html#clearstatement">BNF definition</a> of <font face="Courier New"> clear</font></p>
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