help/info/alive.html

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   9   Baji, Laszlo
  10   Balasko, Jeno
  11   Forstner, Matyas
  12   Gecse, Roland
  13   Szabados, Kristof
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  19 <title>alive</title>
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  35 <p><br clear="all">
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  37 <hr>
  38 <h1>alive</h1>
  39 <p>The alive operation can used to see whether a given parallel test component is alive or not. It works similarly to the running operation, the difference is when used for alive parallel test
  40 components.
  41 <p>Normal parallel test component is alive when it is running. <code>vc_ptc.alive</code> always returns the same value as <code>vc_ptc.running</code> if <code>vc_ptc</code> is a normal parallel
  42 test component.
  43 <p>Alive parallel test component is alive from the point of its first start until it is killed implicitely at MTC termination or explicitely using the kill operation.
  44 <ul>
  45   <li>The operation does not block TTCN-3 program execution, i.e., it reflects the momentary state of the parallel test component and does not wait for its termination.</li>
  46   <li>When the <a href="all.html"><b><font face="Courier New" color="#003258" size="4">all</font></b></a> keyword is used with the operation, it will return true if all parallel
  47   test components started are executing their behavior.</li>
  48   <li>When the <a href="any.html"><b><font face="Courier New" color="#003258" size="4">any</font></b></a> keyword is used with the operation, it will return true if at least one
  49   parallel test component is executing its behavior.</li>
  50 </ul>
  51 <p>Related keywords:</p>
  52 <ul>
  53   <li><a href="alive.html"><b><font face="Courier New" color="#003258" size="4">alive</font></b></a></li>
  54   <li><a href="all.html"><b><font face="Courier New" color="#003258" size="4">all</font></b></a></li>
  55   <li><a href="any.html"><b><font face="Courier New" color="#003258" size="4">any</font></b></a></li>
  56   <li><a href="component.html"> <b><font face="Courier New" color="#003258" size="4">component</font></b> </a></li>
  57   <li><a href="create.html"><b><font face="Courier New" color="#003258" size="4">create</font></b></a>
  58   <li><a href="done.html"><b><font face="Courier New" color="#003258" size="4">done</font></b></a>
  59   <li><a href="kill.html"><b><font face="Courier New" color="#003258" size="4">kill</font></b></a>
  60   <li><a href="killed.html"><b><font face="Courier New" color="#003258" size="4">killed</font></b></a>
  61   <li><a href="running.html"><b><font face="Courier New" color="#003258" size="4">running</font></b></a>
  62   <li><a href="stop.html"><b><font face="Courier New" color="#003258" size="4">stop</font></b></a></li>
  63 </ul>
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  66 <center>
  67 <table border="0" width="90%" bgcolor="#FFB599" cellpadding="4">
  68   <tr>
  69     <td width="100%">
  70     <h3 align="center"><i>component_reference</i><font face="Courier New" color="#003258" size="5"><b>.alive;</b></font> &nbsp;</h3>
  71     </td>
  72   </tr>
  73 </table>
  74 </center>
  75 </div>
  76 <ul>
  77   <li>
  78   <p>The <i>component_reference</i> is one of the following:</p>
  79   <ul>
  80     <li>a reference returned by the <a href="create.html"><b><font face="Courier New" color="#003258" size="4">create</font></b></a> operation to refer to a given parallel test
  81     component,</li>
  82     <li>the keyword pair <a href="all.html"><b><font face="Courier New" color="#003258" size="4">all</font></b></a> <a href="component.html"> <b><font
  83       face="Courier New" color="#003258" size="4">component</font></b> </a> to check whether all parallel test components are still alive,</li>
  84     <li>
  85     <p>the keyword pair <a href="mtc.html"><b><font face="Courier New" color="#003258" size="4">any</font></b></a> <a href="component.html"> <b><font
  86       face="Courier New" color="#003258" size="4">component</font></b></a>&nbsp; to check whether at least one parallel test component is still alive</p>
  87     </li>
  88   </ul>
  89   </li>
  90   <li>
  91   <p>The <b><font face="Courier New" color="#003258" size="4">alive</font> </b> keyword denotes that (a) component(s) should be checked.</p>
  92   </li>
  93 </ul>
  94 <hr align="left" width="75%">
  95 <p>Examples:</p>
  96 <hr align="left" width="50%">
  97 <p>Example 1</a>:</p>
  98 <p><font face="Courier New">var boolean v_Tbana := vc_metro.alive;<br>
  99 </font>
 100 <p>The variable v_Tbana gets the value true if the component with the reference vc_metro is alive, i.e. one of the following conditions apply:
 101 <ul>
 102   <li>vc_metro is a normal parallel test component executing a function; or
 103   <li>vc_metro is an alive parallel test component that has been started al least once and not killed yet.
 104 </ul>
 105 <hr align="left" width="50%">
 106 <p>Example 1b:</p>
 107 <p><font face="Courier New">var boolean v_Ubahn := all component.alive;</font>
 108 <p>The variable v_Ubahn will true if all started parallel components are still alive.</p>
 109 <hr align="left" width="75%">
 110 <p><a HREF="BNF.html#aliveop">BNF definition</a> of <font face="Courier New">component alive</font></p>
 111 </body>
 112 </html>