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+ Sun, 06 Nov 2011 17:32:33 -0800 (PST)\r
+Date: Mon, 7 Nov 2011 03:32:29 +0200\r
+From: Ali Polatel <polatel@gmail.com>\r
+To: David Riebenbauer <davrieb@liegesta.at>\r
+Subject: Re: [PATCH 0/3] notmuch-deliver: wait for database to become\r
+ unlocked and test\r
+Message-ID: <20111107013229.GA27262@hayalet>\r
+Mail-Followup-To: David Riebenbauer <davrieb@liegesta.at>,\r
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+On Sun, Nov 06, 2011 at 12:23:01PM +0100, David Riebenbauer wrote:\r
+>Hi,\r
+>\r
+>I noticed that mail would bounce in my setup, if the xapian database\r
+>was locked while notmuch-deliver tried to run.\r
+\r
+I recall having this problem sometime ago...\r
+\r
+>My solution was to make it wait for some time adn retry. A test\r
+>program for is alos included.\r
+\r
+Looks like a workaround more than a solution. What happens if the\r
+database doesn't become available for writing in the meantime?\r
+\r
+Quoting from:\r
+http://xapian.org/docs/admin_notes.html#single-writer-multiple-reader\r
+\r
+"Xapian enforces this restriction using by having a writer lock the databas=\r
+e.\r
+Each Xapian database directory contains a lock file named flintlock (we've =\r
+kept\r
+the same name as flint used, since the locking technique is the same).\r
+\r
+This lock-file will always exist, but will be locked using fcntl() when the\r
+database is open for writing. Because of the semantics of fcntl() locking, =\r
+for\r
+each WritableDatabase opened we spawn a child process to hold the lock, whi=\r
+ch\r
+then exec-s cat, so you will see a cat subprocess of any writer process in =\r
+the\r
+output of ps, top, etc."\r
+\r
+See? It's a simple fcntl() lock!\r
+\r
+That said, I'm against adding this kind of kludge to notmuch-deliver or\r
+any other tool accessing the database via libnotmuch. Until the issue is\r
+fixed properly I, and I suppose you, can live with a simple shell script\r
+using flock(1) on the file .notmuch/xapian/flintlock.\r
+\r
+One possible solution is described by Austin in the mail:\r
+id:AANLkTi=3DKOx8aTJipkiArFVjEHE6zt_JypoASMiiAWBZ6@mail.gmail.com\r
+which I quite like.\r
+\r
+>Regards,\r
+>David\r
+\r
+ -alip\r
+\r
+>David Riebenbauer (3):\r
+> notmuch-deliver: wait for the database to become unlocked\r
+> notmuch-deliver: test wait for database to become available\r
+> notmuch-deliver: Convert test program to glib main loop.\r
+>\r
+> contrib/notmuch-deliver/.gitignore | 2 +\r
+> contrib/notmuch-deliver/Makefile.am | 2 +-\r
+> contrib/notmuch-deliver/configure.ac | 1 +\r
+> contrib/notmuch-deliver/src/main.c | 25 +++-\r
+> contrib/notmuch-deliver/test/Makefile.am | 26 +++\r
+> contrib/notmuch-deliver/test/nm-test.sh | 9 +\r
+> contrib/notmuch-deliver/test/nm-testconfig | 12 ++\r
+> contrib/notmuch-deliver/test/notmuch-lock.c | 226 ++++++++++++++++++++++=\r
++++++\r
+> contrib/notmuch-deliver/test/testmail | 7 +\r
+> 9 files changed, 306 insertions(+), 4 deletions(-)\r
+> create mode 100644 contrib/notmuch-deliver/test/Makefile.am\r
+> create mode 100755 contrib/notmuch-deliver/test/nm-test.sh\r
+> create mode 100644 contrib/notmuch-deliver/test/nm-testconfig\r
+> create mode 100644 contrib/notmuch-deliver/test/notmuch-lock.c\r
+> create mode 100644 contrib/notmuch-deliver/test/testmail\r
+>\r
+>--=20\r
+>1.7.7.1\r
+>\r
+>_______________________________________________\r
+>notmuch mailing list\r
+>notmuch@notmuchmail.org\r
+>http://notmuchmail.org/mailman/listinfo/notmuch\r
+\r
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projects / notmuch-archives.git / commitdiff