Re: Lost updates to Notmuch database

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+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: Sat, 27 Feb 2016 21:04:41 +0100 (CET)\r
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+On Sun, 21 Feb 2016 13:57:30 +0100 (CET), Eric J <eric@deptj.eu> wrote:\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
+Well, this seems to be a Tcl problem, not present in 8.5, but present in\r
+8.6, up until the very new 8.6.5rc2, where it seems to work. Sadly, I\r
+still have no explanation of the problem.\r
+\r
+Eric\r
+-- \r
+ms fnd in a lbry\r