From -5743140567707402679 X-Google-Thread: f78e5,edf2eb1d3f0f9755 X-Google-Attributes: gidf78e5,public X-Google-Language: ENGLISH,ASCII-7-bit Path: g2news1.google.com!news1.google.com!news2.google.com!proxad.net!proxad.net!213.253.16.105.MISMATCH!mephistopheles.news.clara.net!news.clara.net!wagner.news.clara.net!194.159.246.34.MISMATCH!peer-uk.news.demon.net!kibo.news.demon.net!news.demon.co.uk!demon!stump.algebra.com!devnull From: terekhov@web.de (Alexander Terekhov) Newsgroups: comp.std.c++ Subject: Re: Multithreaded programming: is the C++ standardization committeelistening? Date: Mon, 23 Aug 2004 15:58:15 GMT Lines: 23 Sender: mail2news@demon.net Approved: fjh@cs.mu.oz.au (Fergus Henderson , moderator of comp.std.c++) Message-ID: <4129E129.380B0960@web.de> References: <2ofbepFa2tpoU1@uni-berlin.de> <6uh6i0tbr0j0urbnocg5t9ucb5gfpr8gr3@4ax.com> <2ohmmiFavqsiU1@uni-berlin.de> <4123BD01.BCF1DC67@web.de> <2oig7mFb30cmU1@uni-berlin.de> <2okpccFbrqqkU1@uni-berlin.de> <2ongt9Fcr7pgU1@uni-berlin.de> <4127A8E3.2A99331F@web.de> NNTP-Posting-Host: news.news.demon.net Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Trace: news.demon.co.uk 1093276698 12056 158.152.254.254 (23 Aug 2004 15:58:18 GMT) X-Complaints-To: abuse@demon.net NNTP-Posting-Date: Mon, 23 Aug 2004 15:58:18 +0000 (UTC) X-Robomod: STUMP, ichudov@algebra.com (Igor Chudov) X-Spam-Checker-Version: SpamAssassin 2.64-mulga_r1 (2004-01-11) on mulga.cs.mu.OZ.AU X-Orig-X-Trace: news.uni-berlin.de IwoG+uN+jOEhgYf7ZIMrfgF3CpX+h8FX3W7j2/gk1wLVL8Bf5c X-Spam-Status: No, hits=-4.8 required=5.0 tests=AWL,BAYES_00 autolearn=ham version=2.64-mulga_r1 X-Accept-Language: en X-Reply-To: terekhov@web.de X-Received: (from fjh@localhost) by mulga.cs.mu.OZ.AU (8.12.10+Sun/8.12.9/Submit) id i7NFwFbX006397; Tue, 24 Aug 2004 01:58:15 +1000 (EST) X-Path: comp-std-cpp-robomod!not-for-mail X-Spam-Level: X-Delivered-To: std-c++@ucar.edu X-Authentication-Warning: mulga.cs.mu.OZ.AU: fjh set sender to devnull@stump.algebra.com using -f X-Newsgroups: comp.std.c++ Xref: g2news1.google.com comp.std.c++:2057 "David B. Held" wrote: > > Alexander Terekhov wrote: > > [...] > > Why would you need some barrier on increment? > > Thread 1 loads count from memory and increments it. It gets written to > cache but not to memory [yet]. Thread 2, on a different processor, > loads the same count from memory and increments it. They each write the > same value to memory. Are you saying this won't happen, and why? Because each write is done using CAS or LL(LR)/SC. regards, alexander. --- [ comp.std.c++ is moderated. To submit articles, try just posting with ] [ your news-reader. If that fails, use mailto:std-c++@ncar.ucar.edu ] [ --- Please see the FAQ before posting. --- ] [ FAQ: http://www.jamesd.demon.co.uk/csc/faq.html ]