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From: David Bremner <david@tethera.net>
To: Istvan Marko <notmuch@kismala.com>, Jani Nikula <jani@nikula.org>,
 notmuch@notmuchmail.org
Subject: v3 of DB_RETRY_LOCK
Date: Sat,  4 Jun 2016 09:29:12 -0300
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[PATCH 1/4] Use the Xapian::DB_RETRY_LOCK flag when available

This is the original patch, rebased on master. I took the liberty of
converting the configure test to a test compile.

[PATCH 2/4] test: factor out some boilerplate from C tests
[PATCH 3/4] test: initial tests for locking retry

Add a simple test of locking retry.

[PATCH 4/4] lib: add built_with handling for XAPIAN_DB_RETRY_LOCK

Make it visible to the user whether their notmuch supports locking
retry (blocking open).

The remaining question for me is if we are happy with defaulting to
blocking (w/o timeout) on open. I'm not sure how you could deadlock
without writing C code, but it's pretty easy with fork. As I
discovered writing my test case.