Christmas Quiz...

From	"Chris M. Thomasson" <chris.m.thomasson.1@gmail.com>
Newsgroups	comp.lang.c++
Subject	Christmas Quiz...
Date	2022-12-26 13:22 -0800
Organization	A noiseless patient Spider
Message-ID	<tod3b8$3c8u8$4@dont-email.me> (permalink)

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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

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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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