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   3     <title>libsm : General Definitions</title>
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  10     <h1> libsm : General Definitions </h1>
  11     <br> $Id: gen.html,v 1.5 2000/12/08 21:41:42 ca Exp $
  12 </center>
  13
  14 <h2> Introduction </h2>
  15
  16 The header file <tt>&lt;sm/gen.h&gt;</tt>
  17 contains general definitions that are used by every other
  18 header file in <b>libsm</b>.
  19
  20 <h2> Synopsis </h2>
  21
  22 <pre>
  23 #include &lt;sm/gen.h&gt;
  24
  25 #define NULL            ((void*)0)
  26
  27 typedef int bool;
  28 #define false   0
  29 #define true    1
  30
  31 #define SM_MAX(a, b)    ((a) &gt; (b) ? (a) : (b))
  32 #define SM_MIN(a, b)    ((a) &lt; (b) ? (a) : (b))
  33
  34 /*
  35 **  The following types can be accessed and updated atomically.
  36 **  This is relevant in the context of signal handlers and threads.
  37 */
  38 typedef <i>some signed integral type</i> SM_ATOMIC_INT_T;
  39 typedef <i>some unsigned integral type</i> SM_ATOMIC_UINT_T;
  40 </pre>
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