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Groups > comp.lang.c++ > #88272
| From | "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Christmas Quiz... |
| Date | 2022-12-27 13:29 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <tofo3e$3nhm2$2@dont-email.me> (permalink) |
| References | <tod3b8$3c8u8$4@dont-email.me> <todqib$3hkat$3@dont-email.me> |
On 12/26/2022 7:59 PM, Bonita Montero wrote: > Am 26.12.2022 um 22:22 schrieb Chris M. Thomasson: >> Imagine you are on a SPARC in RMO mode, you are programming in >> assembly language. What memory barrier instruction is the most >> efficient _and_ correct for use _after_ using an atomic RMW >> instruction to take exclusive access? Think about locking a mutex... >> >> A: MEMBAR #LoadLoad >> >> B: MEMBAR #LoadStore | #LoadLoad >> >> C: MEMBAR #StoreLoad | #LoadLoad >> >> D: MEMBAR #StoreLoad | #StoreStore >> >> >> What about the membar we have to use before atomically unlocking this >> mutex? >> >> >> A: MEMBAR #LoadLoad >> >> B: MEMBAR #StoreLoad | #LoadLoad >> >> C: MEMBAR #LoadStore | #StoreStore >> >> D: MEMBAR #StoreLoad | #StoreStore > > 1. I use proper C++ barriers so I won't have to care for that. > 2. SPARC is dead. > Well, suppose you were tasked with creating the guts for C++ membars for the SPARC. Imvvho, the SPARC in RMO mode is a good place to learn. The MEMBAR instruction is pretty damn diverse! :^)
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Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-26 13:22 -0800
Re: Christmas Quiz... "Alf P. Steinbach" <alf.p.steinbach@gmail.com> - 2022-12-26 23:17 +0100
Re: Christmas Quiz... Bonita Montero <Bonita.Montero@gmail.com> - 2022-12-27 04:59 +0100
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-27 13:29 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-04 00:40 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-04 00:41 -0800
Re: Christmas Quiz... Michael S <already5chosen@yahoo.com> - 2022-12-27 03:38 -0800
Re: Christmas Quiz... Michael S <already5chosen@yahoo.com> - 2022-12-27 03:42 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-27 13:31 -0800
Re: Christmas Quiz... Michael S <already5chosen@yahoo.com> - 2022-12-27 14:09 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-27 14:17 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2022-12-29 20:42 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-04 00:38 -0800
Re: Christmas Quiz... "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2023-01-17 18:25 -0800
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