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+From: Eric J <eric@deptj.eu>\r
+Subject: Re: Tcl bindings for notmuch\r
+To: notmuch@notmuchmail.org\r
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+\r
+On Sun, 14 Feb 2016 13:05:28 +0100 (CET), Eric J <eric@deptj.eu> wrote:\r
+>\r
+\r
+Resending with additional information:\r
+\r
+> I have been using notmuch for a while and I wanted to be able to use\r
+> notmuch queries in some Tcl stuff I have been using for a rather longer\r
+> while. I could have just called the notmuch CLI every time, but I thought\r
+> "no, it's a library, there should be bindings".\r
+> \r
+> Bindings made me think of SWIG, which seems to have been tried for\r
+> notmuch in the past but abandoned. However, with some time available...\r
+> \r
+> ... I can now, from Tcl, use the API functions from the library to\r
+> create a database, close and open it, add messages, tag them, run queries\r
+> and retrieve information about the results. I haven't tested every API\r
+> function yet, but I will be able to go on with my own needs at least. It\r
+> is only functions with pointer-to-pointer arguments that need special\r
+> attention, and that is all in the SWIG interface file. You can see that at\r
+> http://chiselapp.com/user/emj/repository/tclnotmuch/artifact/527aee944d?txt=1&ln=0\r
+> - its about 50 lines (plus some blanks).\r
+> \r
+> That's a Fossil repository, with a home page at\r
+> http://chiselapp.com/user/emj/repository/tclnotmuch , if anyone wants\r
+> to look further. I think it may benefit from more wrapping from the Tcl\r
+> side, just for usability.\r
+> \r
+> BTW, I have no idea if or how the interface file would have to be changed\r
+> for other languages.\r
+\r
+The bindings work, but for a use case where simultaneous database access\r
+from different processes is needed (e.g. processing emails as they\r
+arrive), lost updates are possible for the following Tcl versions:\r
+\r
+* 8.5.18 built with threads (not the default)\r
+* 8.6.[1-4] built with threads (default)\r
+\r
+However, the following Tcl versions do not have this problem:\r
+\r
+* 8.5.18 built without threads (default)\r
+* 8.5.19 built with or without threads\r
+* 8.6.[1-4] built without threads (not the default)\r
+* 8.6.5 built with or without threads\r
+\r
+Earlier 8.5.x are presumably the same as 8.5.18.\r
+\r
+The problems, where they exist, are due to a weird interaction between\r
+Tcl's thread implementation and Xapian's locking mechanism. The Tcl fix\r
+in 8.5.19/8.6.5 was made for reasons unrelated to Xapian locking, but\r
+fixes it anyway.\r
+\r
+Eric\r
+-- \r
+ms fnd in a lbry\r
projects / notmuch-archives.git / commitdiff