software/!RELEASES/ircservices/achurch.org/services/lists/ircservices/2005/004776.html

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  14    <H1>[IRCServices] out of buffer?</H1>
  15     <B>Andrew Church</B>
  16     <A HREF="mailto:ircservices%40ircservices.esper.net?Subject=%5BIRCServices%5D%20out%20of%20buffer%3F&In-Reply-To=20050125041419.GA18503%40edgemaster.zombie.org"
  17        TITLE="[IRCServices] out of buffer?">achurch at achurch.org
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  19     <I>Tue Jan 25 14:52:08 PST 2005</I>
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  34 <PRE>&gt;<i>Can't you hold an exclusive lock (flock, lockf, etc) on the database while
  35 </I>&gt;<i>writing them and then release it when done writing? That way, the
  36 </I>&gt;<i>`ircservices -export` could try to obtain a shared lock (since it is
  37 </I>&gt;<i>read-only) and it will spin while the DBs are still being written.
  38 </I>
  39      True, but since there are several database files that would mean
  40 having to check/lock several files, which is inconvenient.
  41
  42      On second thought, Services always creates a lock file (.lock by
  43 default) in the data directory while it's writing, and refuses to write
  44 if the file exists, so you could do something like (in Perl):
  45
  46         sysopen LOCK, &quot;/.../.lock&quot;, O_CREAT|O_EXCL, 0 or die &quot;locked\n&quot;;
  47         system(&quot;ircservices -export&quot;);
  48         close LOCK;
  49         unlink &quot;/.../.lock&quot;;
  50
  51   --Andrew Church
  52     <A HREF="http://lists.ircservices.za.net/mailman/listinfo/ircservices">achurch at achurch.org</A>
  53     <A HREF="http://achurch.org/">http://achurch.org/</A>
  54 </PRE>
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