[Xapian-tickets] [Xapian] #648: Allow readers to lock revisions

[Xapian]

#648: Allow readers to lock revisions
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 Reporter:  olly           |             Owner:  olly
     Type:  defect         |            Status:  new
 Priority:  normal         |         Milestone:  1.3.3
Component:  Backend-Brass  |           Version:  SVN trunk
 Severity:  normal         |        Resolution:
 Keywords:                 |        Blocked By:
 Blocking:                 |  Operating System:  All
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Comment (by olly):

 In #40, the following approach is suggested:

 > [If] readers use fcntl locking on a single byte corresponding to the
 revision they're using (bytes off the end of the file can be locked, and
 shared locks on read-only files are ok). Then a writer would only delete
 old revisions for which it could obtain an exclusive lock (otherwise it
 would preserve them).
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Ticket URL: <http://trac.xapian.org/ticket/648#comment:1>
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