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PMH / cmmtalk-ye2000 / slide16.htm 

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      <TD><code>fcntl()</code> locking not portable
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      <TD>may not exist at all
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      <TD>not very likely
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      <TD><code>struct flock</code> may be specified differently on different OSes
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      <TD>will be moved to XS very soon
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      <TD>only works between processes on the same machine
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      <TD>not a significant problem
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      <TD>not thread-safe
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