Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail From: Alexander Terekhov Newsgroups: comp.programming.threads Subject: Re: questions about memory_order_seq_cst fence Date: Fri, 17 Jun 2011 16:19:03 +0200 Organization: A noiseless patient Spider Lines: 14 Message-ID: <4DFB6257.8C513BD7@web.de> References: <43eb372b-6517-4914-b647-860f1f7136ba@k15g2000pri.googlegroups.com> <87boxyfctc.fsf@justsoftwaresolutions.co.uk> <4DF9D581.E607BEB4@web.de> <8739jaf59n.fsf@justsoftwaresolutions.co.uk> <4DF9EF9A.911CC74F@web.de> <87wrgm9bxk.fsf@justsoftwaresolutions.co.uk> <4DFA18D0.3A413EED@web.de> <87oc1xajr3.fsf@justsoftwaresolutions.co.uk> <4DFA2342.52931D8@web.de> <87k4clai0h.fsf@justsoftwaresolutions.co.uk> <87boxxahfj.fsf@justsoftwaresolutions.co.uk> <98uKp.16038$SG4.15177@newsfe03.iad> <2671e224-80a9-4e11-a224-64240676069f@y27g2000prb.googlegroups.com> <871uyt3pns.fsf@justsoftwaresolutions.co.uk> Reply-To: terekhov@web.de Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Injection-Info: mx04.eternal-september.org; posting-host="MCbSEzW5qwGLFMNXJh39IQ"; logging-data="2285"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1/tKosSdqWLfef+h/bHghG9CH+aKUN8TZ8=" X-Mailer: Mozilla 4.77 [en] (Windows NT 5.0; U) X-Accept-Language: en Cancel-Lock: sha1:TDF8Uw4S9QiLEKdwZ9MYCl+xKBE= Xref: x330-a1.tempe.blueboxinc.net comp.programming.threads:318 Anthony Williams wrote: [...] > SC fences should order relaxed reads, but the final result was that they > don't, as it was too expensive on some architectures (such as IA-64). Care to elaborate? What is the problem regarding IA-64? Refs: http://www.decadent.org.uk/pipermail/cpp-threads/2008-December/001932.html http://www.decadent.org.uk/pipermail/cpp-threads/2008-December/001942.html http://www.decadent.org.uk/pipermail/cpp-threads/2008-December/001954.html regards, alexander.