From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 28541 invoked by alias); 21 Feb 2014 00:14:42 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 28499 invoked by uid 55); 21 Feb 2014 00:14:38 -0000 From: "rth at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug c++/60272] atomic<>::compare_exchange_weak has spurious store and can cause race conditions Date: Fri, 21 Feb 2014 00:14:00 -0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: c++ X-Bugzilla-Version: 4.8.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: rth at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: rth at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2014-02/txt/msg02171.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60272 --- Comment #6 from Richard Henderson --- Author: rth Date: Fri Feb 21 00:14:05 2014 New Revision: 207973 URL: http://gcc.gnu.org/viewcvs?rev=207973&root=gcc&view=rev Log: PR c++/60272 gcc/ * builtins.c (expand_builtin_atomic_compare_exchange): Conditionalize on failure the store back into EXPECT. libatomic/ * cas_n.c (libat_compare_exchange): Conditionalize on failure the store back to EPTR. Modified: branches/gcc-4_8-branch/gcc/ChangeLog branches/gcc-4_8-branch/gcc/builtins.c branches/gcc-4_8-branch/libatomic/ChangeLog branches/gcc-4_8-branch/libatomic/cas_n.c