Xapian locking errors with custom query parser

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+From: Michal Sojka <sojkam1@fel.cvut.cz>\r
+To: notmuch@notmuchmail.org\r
+Subject: Xapian locking errors with custom query parser\r
+User-Agent: Notmuch/0.5-87-g9705d00 (http://notmuchmail.org) Emacs/23.2.1\r
+       (x86_64-pc-linux-gnu)\r
+Date: Fri, 28 Jan 2011 11:18:46 +0100\r
+Message-ID: <87d3nhe3g9.fsf@steelpick.2x.cz>\r
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+Content-Type: text/plain; charset=us-ascii\r
+Cc: Austin Clements <amdragon@mit.edu>\r
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+\r
+Hi Austin,\r
+\r
+when I switched to using your custom query parser I started experiencing\r
+"Unable to get write lock" errors when I run my initial tagging script.\r
+I thought that this was because I run the script while processing the\r
+mail in Emacs, but today I realized that this happens even without Emacs\r
+and that it can be reproduced by a simple command below.\r
+\r
+i=0; while notmuch tag +xxx tag:whatever; do i=$((i+1)); echo $i; done\r
+\r
+It seems that sometimes the unlocking of the Xapian database happens\r
+somewhat lazily and when the subsequent command starts I get:\r
+\r
+A Xapian exception occurred opening database: Unable to get write lock on /home/wsh/mail/.notmuch/xapian: already locked\r
+\r
+This happens almost regularly after a few iterations of the loop even if\r
+the query doesn't match anything. \r
+\r
+Do you have an idea what may cause this?\r
+\r
+Can you reproduce this on your system?\r
+\r
+The version I use can be obtained from\r
+\r
+  git://rtime.felk.cvut.cz/notmuch.git custom-query-pasrser\r
+\r
+Thanks\r
+-Michal\r