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Path: news.eternal-september.org!eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> Newsgroups: comp.lang.c++ Subject: Re: Futexes ain't fast Date: Fri, 30 Aug 2024 15:22:25 -0700 Organization: A noiseless patient Spider Lines: 20 Message-ID: <vatgn1$lgvi$2@dont-email.me> References: <van414$3fe9t$1@raubtier-asyl.eternal-september.org> <vashj8$gpjk$1@dont-email.me> <vasp6h$i41a$1@raubtier-asyl.eternal-september.org> <vat7db$k5je$6@dont-email.me> <vat8i6$kjk5$1@raubtier-asyl.eternal-september.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Sat, 31 Aug 2024 00:22:25 +0200 (CEST) Injection-Info: dont-email.me; posting-host="42c1614fa3c92521646b1b2a482f70ce"; logging-data="705522"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX18GugqtbBYCWbEvNMdbM/K4DwbCELF10ZE=" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:cx2A7e97sviZtBBJKYyszW1hems= Content-Language: en-US In-Reply-To: <vat8i6$kjk5$1@raubtier-asyl.eternal-september.org> On 8/30/2024 1:03 PM, Bonita Montero wrote: > Am 30.08.2024 um 21:43 schrieb Chris M. Thomasson: >> On 8/30/2024 8:41 AM, Bonita Montero wrote: >>> Am 30.08.2024 um 15:31 schrieb jseigh: >>> >>>> They don't have to be fast, they just have to allow correct >>>> synchronization >>>> and allow performant fast paths. ... >>> >>> Futexes are there to make the slow past faster. >>> The fast path has been fast before. >>> >> >> No. You are wrong here. > > > No, you don't need a futex for the slow path. > The idea is to minimize calls into any slow path... :^)