From: Austin Clements Date: Wed, 24 Sep 2014 21:32:50 +0000 (+2000) Subject: [PATCH v3] lib: Simplify close and codify aborting atomic section X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=e432091292ada45d51a189492eb809db94483cf8;p=notmuch-archives.git [PATCH v3] lib: Simplify close and codify aborting atomic section --- diff --git a/29/8820fb7e037061fd37bfecf1143def75e577cb b/29/8820fb7e037061fd37bfecf1143def75e577cb new file mode 100644 index 000000000..419afe619 --- /dev/null +++ b/29/8820fb7e037061fd37bfecf1143def75e577cb @@ -0,0 +1,172 @@ +Return-Path: +X-Original-To: notmuch@notmuchmail.org +Delivered-To: notmuch@notmuchmail.org +Received: from localhost (localhost [127.0.0.1]) + by olra.theworths.org (Postfix) with ESMTP id 14B6B431FBF + for ; Wed, 24 Sep 2014 14:33:12 -0700 (PDT) +X-Virus-Scanned: Debian amavisd-new at olra.theworths.org +X-Spam-Flag: NO +X-Spam-Score: -2.3 +X-Spam-Level: +X-Spam-Status: No, score=-2.3 tagged_above=-999 required=5 + tests=[RCVD_IN_DNSWL_MED=-2.3] autolearn=disabled +Received: from olra.theworths.org ([127.0.0.1]) + by localhost (olra.theworths.org [127.0.0.1]) (amavisd-new, port 10024) + with ESMTP id NDOW85WMgbcU for ; + Wed, 24 Sep 2014 14:33:05 -0700 (PDT) +Received: from dmz-mailsec-scanner-1.mit.edu (dmz-mailsec-scanner-1.mit.edu + [18.9.25.12]) + (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) + (No client certificate requested) + by olra.theworths.org (Postfix) with ESMTPS id 07A7E431FAF + for ; Wed, 24 Sep 2014 14:33:04 -0700 (PDT) +X-AuditID: 1209190c-f795e6d000006c66-62-54233890c6ce +Received: from mailhub-auth-2.mit.edu ( [18.7.62.36]) + (using TLS with cipher AES256-SHA (256/256 bits)) + (Client did not present a certificate) + by dmz-mailsec-scanner-1.mit.edu (Symantec Messaging Gateway) with SMTP + id 3A.34.27750.09833245; Wed, 24 Sep 2014 17:33:04 -0400 (EDT) +Received: from outgoing.mit.edu (outgoing-auth-1.mit.edu [18.9.28.11]) + by mailhub-auth-2.mit.edu (8.13.8/8.9.2) with ESMTP id s8OLX2hL023020; + Wed, 24 Sep 2014 17:33:02 -0400 +Received: from drake.dyndns.org (q-1.n.148.220.37.qore.nl [37.220.148.94] (may + be forged)) (authenticated bits=0) + (User authenticated as amdragon@ATHENA.MIT.EDU) + by outgoing.mit.edu (8.13.8/8.12.4) with ESMTP id s8OLWwjf023605 + (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=NOT); + Wed, 24 Sep 2014 17:33:01 -0400 +Received: from amthrax by drake.dyndns.org with local (Exim 4.84) + (envelope-from ) + id 1XWuBA-0002Yq-Lo; Wed, 24 Sep 2014 17:32:52 -0400 +From: Austin Clements +To: notmuch@notmuchmail.org +Subject: [PATCH v3] lib: Simplify close and codify aborting atomic section +Date: Wed, 24 Sep 2014 17:32:50 -0400 +Message-Id: <1411594370-9794-1-git-send-email-aclements@csail.mit.edu> +X-Mailer: git-send-email 2.1.0 +In-Reply-To: <20140924212839.GE20130@odin.tremily.us> +References: <20140924212839.GE20130@odin.tremily.us> +X-Brightmail-Tracker: + H4sIAAAAAAAAA+NgFrrIIsWRmVeSWpSXmKPExsUixG6nojvBQjnE4PNaUYsbrd2MFtdvzmS2 + uLLmPLsDs8ezVbeYPbYces/ssfv7T5YA5igum5TUnMyy1CJ9uwSujAtTFrAULJCrOLzmNXMD + 40qJLkZODgkBE4ntfdfZIWwxiQv31rN1MXJxCAnMZpK4MW8ylLORUeLdqrNMEM4FJokzJxey + gbQICSxhlNi4VBjEZhPQl1ixdhIriC0iIC2x8+5sMJtZwFti9tfVYCuEBbwkemftAerl4GAR + UJW4PD8OxOQVcJPY9k4G4gg5iQ27/zOC2JwCphKdk18yQ2wykbja94l1AiP/AkaGVYyyKblV + urmJmTnFqcm6xcmJeXmpRbqGermZJXqpKaWbGEGhxSnJs4PxzUGlQ4wCHIxKPLwTxJVChFgT + y4orcw8xSnIwKYnyrtVXDhHiS8pPqcxILM6ILyrNSS0+xCjBwawkwqvyEaicNyWxsiq1KB8m + Jc3BoiTOu+kHX4iQQHpiSWp2ampBahFMVoaDQ0mCV98caKhgUWp6akVaZk4JQpqJgxNkOA/Q + 8HkgNbzFBYm5xZnpEPlTjLoc6zq/9TMJseTl56VKifNeNQMqEgApyijNg5sDSwmvGMWB3hLm + 5QUZxQNMJ3CTXgEtYQJacv+4PMiSkkSElFQDoxd7zl8mS8E1G7himl7z8NbMPfNf6NMX/e7D + 0R4zjH1fXncTq4/buuRi8cutmy3t7363LuuMNjAXf9j65cjc2EQfpWNzbURnfxDx3uog5vDh + yYm+ho66//tFLmneLHra8jTwSOollUufry8tluRapOy++NTZ99fFEtiDyz8fexadx/1msyff + FyWW4oxEQy3mouJEANER8aDkAgAA +X-BeenThere: notmuch@notmuchmail.org +X-Mailman-Version: 2.1.13 +Precedence: list +List-Id: "Use and development of the notmuch mail system." + +List-Unsubscribe: , + +List-Archive: +List-Post: +List-Help: +List-Subscribe: , + +X-List-Received-Date: Wed, 24 Sep 2014 21:33:12 -0000 + +From: Austin Clements + +In Xapian, closing a database implicitly aborts any outstanding +transaction and commits changes. For historical reasons, +notmuch_database_close had grown to almost, but not quite duplicate +this behavior. Before closing the database, it would explicitly (and +unnecessarily) commit it. However, if there was an outstanding +transaction (ie atomic section), commit would throw a Xapian +exception, which notmuch_database_close would unnecessarily print to +stderr, even though notmuch_database_close would ultimately abort the +transaction anyway when it called close. + +This patch simplifies notmuch_database_close to just call +Database::close. This works for both read-only and read/write +databases, takes care of committing changes, unifies the exception +handling path, and codifies aborting outstanding transactions. This +is currently the only way to abort an atomic section (and may remain +so, since it would be difficult to roll back things we may have cached +from rolled-back modifications). +--- + +'Doh. Left out the all-critical "git commit" before sending v2. + + lib/database.cc | 23 +++++++---------------- + lib/notmuch.h | 8 +++++++- + 2 files changed, 14 insertions(+), 17 deletions(-) + +diff --git a/lib/database.cc b/lib/database.cc +index a3a7cd3..1f7ff2a 100644 +--- a/lib/database.cc ++++ b/lib/database.cc +@@ -903,28 +903,19 @@ notmuch_database_close (notmuch_database_t *notmuch) + { + notmuch_status_t status = NOTMUCH_STATUS_SUCCESS; + +- try { +- if (notmuch->xapian_db != NULL && +- notmuch->mode == NOTMUCH_DATABASE_MODE_READ_WRITE) +- (static_cast (notmuch->xapian_db))->flush (); +- } catch (const Xapian::Error &error) { +- status = NOTMUCH_STATUS_XAPIAN_EXCEPTION; +- if (! notmuch->exception_reported) { +- fprintf (stderr, "Error: A Xapian exception occurred flushing database: %s\n", +- error.get_msg().c_str()); +- } +- } +- + /* Many Xapian objects (and thus notmuch objects) hold references to + * the database, so merely deleting the database may not suffice to +- * close it. Thus, we explicitly close it here. */ ++ * close it. Thus, we explicitly close it here. This will ++ * implicitly abort any outstanding transaction and commit changes. */ + if (notmuch->xapian_db != NULL) { + try { + notmuch->xapian_db->close(); + } catch (const Xapian::Error &error) { +- /* don't clobber previous error status */ +- if (status == NOTMUCH_STATUS_SUCCESS) +- status = NOTMUCH_STATUS_XAPIAN_EXCEPTION; ++ status = NOTMUCH_STATUS_XAPIAN_EXCEPTION; ++ if (! notmuch->exception_reported) { ++ fprintf (stderr, "Error: A Xapian exception occurred closing database: %s\n", ++ error.get_msg().c_str()); ++ } + } + } + +diff --git a/lib/notmuch.h b/lib/notmuch.h +index fe2340b..49a3c79 100644 +--- a/lib/notmuch.h ++++ b/lib/notmuch.h +@@ -281,7 +281,7 @@ notmuch_database_open (const char *path, + notmuch_database_t **database); + + /** +- * Close the given notmuch database. ++ * Commit changes and close the given notmuch database. + * + * After notmuch_database_close has been called, calls to other + * functions on objects derived from this database may either behave +@@ -292,6 +292,12 @@ notmuch_database_open (const char *path, + * notmuch_database_close can be called multiple times. Later calls + * have no effect. + * ++ * If the caller is currently in an atomic section (there was a ++ * notmuch_database_begin_atomic without a matching ++ * notmuch_database_end_atomic), this will abort the atomic section, ++ * discarding any modifications made in the atomic section. All ++ * changes up to this will be committed. ++ * + * Return value: + * + * NOTMUCH_STATUS_SUCCESS: Successfully closed the database. +-- +2.1.0 +