[PATCH 1/3] Use the Xapian::DB_RETRY_LOCK flag when available

[David Bremner]

David Bremner <david at tethera.net> writes:

> From: Istvan Marko <notmuch at kismala.com>
>
> Xapian 1.3 has introduced the DB_RETRY_LOCK flag (Xapian bug
> 275). Detect it in configure and optionally use it. With this flag
> commands that need the write lock will wait for their turn instead of
> aborting when it's not immediately available.

series pushed

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