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Groups > comp.lang.c++ > #88273
| From | "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: Christmas Quiz... |
| Date | 2022-12-27 13:31 -0800 |
| Organization | A noiseless patient Spider |
| Message-ID | <tofo74$3nhm2$3@dont-email.me> (permalink) |
| References | <tod3b8$3c8u8$4@dont-email.me> <cd552208-e199-4e50-9ec5-d0c3f9d7eeeen@googlegroups.com> |
On 12/27/2022 3:42 AM, Michael S wrote: > On Monday, December 26, 2022 at 11:23:06 PM UTC+2, Chris M. Thomasson wrote: >> Imagine you are on a SPARC in RMO mode, you are programming in assembly >> language. > > If I am not mistaken, SPARC RMO is paper spec that was never implemented > in hardware. Which does not mean that it is impossible to imagine that I am > programming it in assembler, but it takes stronger imagination than I posses. SPARC RMO is a real thing. https://www.linuxjournal.com/article/8212 "Solaris on SPARC uses total-store order (TSO); however, Linux runs SPARC in relaxed-memory order (RMO) mode." > >> 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
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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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