[xapian] Locking rewrite in Xapian search module. #2201
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This patch uses 2 locks for Xapian search: * The current `activefile` lock that we use * A new named lock. The named lock will be on a file whose name looks like $XAPIAN$<userid>.lock. Details about the implementation are available here[1]. [1] https://github.com/cyrusimap/cyrus-imapd/blob/master/doc/internal/locking.txt
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This patch uses 2 locks for Xapian search:
activefilelock that we useThe named lock will be on a file whose name looks like
$XAPIAN.lock.
Details about the implementation are available here[1].
[1] https://github.com/cyrusimap/cyrus-imapd/blob/master/doc/internal/locking.txt