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<H1><A NAME="SECTION009000000000000000000"></A>
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7. Optional Operating System Services
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<P>
The modules described in this chapter provide interfaces to operating
system features that are available on selected operating systems only.
The interfaces are generally modelled after the Unix or C
interfaces but they are available on some other systems as well
(e.g. Windows or NT).  Here's an overview:

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  <tr><td><b><tt><a href="module-signal.html">signal</a></tt></b></td>
      <td>Set handlers for asynchronous events.</td></tr>
  <tr><td><b><tt><a href="module-socket.html">socket</a></tt></b></td>
      <td>Low-level networking interface.</td></tr>
  <tr><td><b><tt><a href="module-select.html">select</a></tt></b></td>
      <td>Wait for I/O completion on multiple streams.</td></tr>
  <tr><td><b><tt><a href="module-thread.html">thread</a></tt></b></td>
      <td>Create multiple threads of control within one interpreter.</td></tr>
  <tr><td><b><tt><a href="module-threading.html">threading</a></tt></b></td>
      <td>Higher-level threading interface.</td></tr>
  <tr><td><b><tt><a href="module-Queue.html">Queue</a></tt></b></td>
      <td>A synchronized queue class.</td></tr>
  <tr><td><b><tt><a href="module-anydbm.html">anydbm</a></tt></b></td>
      <td>Generic interface to DBM-style database modules.</td></tr>
  <tr><td><b><tt><a href="module-dumbdbm.html">dumbdbm</a></tt></b></td>
      <td>Portable implementation of the simple DBM interface.</td></tr>
  <tr><td><b><tt><a href="module-dbhash.html">dbhash</a></tt></b></td>
      <td>DBM-style interface to the BSD database library.</td></tr>
  <tr><td><b><tt><a href="module-whichdb.html">whichdb</a></tt></b></td>
      <td>Guess which DBM-style module created a given database.</td></tr>
  <tr><td><b><tt><a href="module-bsddb.html">bsddb</a></tt></b></td>
      <td>Interface to Berkeley DB database library</td></tr>
  <tr><td><b><tt><a href="module-zlib.html">zlib</a></tt></b></td>
      <td>Low-level interface to compression and decompression
                routines compatible with <b class=program>gzip</b>.</td></tr>
  <tr><td><b><tt><a href="module-gzip.html">gzip</a></tt></b></td>
      <td>Interfaces for <b class=program>gzip</b> compression and
decompression using file objects.</td></tr>
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