Re: Lost updates to Notmuch database

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+ for notmuch@notmuchmail.org; Sun, 21 Feb 2016 13:58:06 +0100\r
+From: Eric J <eric@deptj.eu>\r
+Subject: Re: Lost updates to Notmuch database\r
+To: notmuch@notmuchmail.org\r
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+Date: Sun, 21 Feb 2016 13:57:30 +0100 (CET)\r
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+\r
+On Wed, 17 Feb 2016 21:44:23 +0100 (CET), Eric J <eric@deptj.eu> wrote:\r
+> Using the API, I am adding single mail files, already in the maildir, to\r
+> the Notmuch database and tagging them. It works, every time, as long as\r
+> I run it one file at a time. \r
+> \r
+> However, if I do it twice, in different processes, at the same time, one\r
+> file is added and tagged properly, the other is not (totally unfindable\r
+> by notmuch search). Neither process reports any error, and they both log\r
+> their actions normally. Actually a third simultaneous process also fails\r
+> to leave any result in the database.\r
+8>< --------\r
+> \r
+> The wrapper around the API for Tcl is very simple, and I can not see any\r
+> way for that or Tcl itself to cause this sort of problem. Beyond this,\r
+> I haven't thought of any way to decide if this could be a Notmuch problem\r
+> or a Xapian problem.\r
+8>< --------\r
+\r
+Well, after some experimenting, this is not specific to Notmuch at all.\r
+Xapian itself has Tcl bindings, and they also silently fail to lock the\r
+file. So does putting a minimally changed copy of Xapian's locking code\r
+directly in a Tcl extension, though that code works when called from a\r
+tiny C main program instead.\r
+\r
+So thanks for looking, I will report here if I find out why.\r
+\r
+Eric\r
+-- \r
+ms fnd in a lbry\r