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stjepang's profile
Stjepan Glavina
Stjepan Glavina
Stjepan Glavina
@stjepang

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Stjepan Glavina

@stjepang

async runtimes and concurrency primitives in @rustlang he/they (available for hire)

Berlin, Germany
stjepang.github.io
Joined October 2009

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    1. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      I understand them, but perhaps not well enough to coherently explain them.

      1 reply 0 retweets 0 likes
    2. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      And that's one of the problems! There are very few places these things are coherently explained! Even for C!

      1 reply 0 retweets 0 likes
    3. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      There are a bunch of aspects involved here, not all of which he covered.

      1 reply 0 retweets 0 likes
    4. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      Firstly, atomic ops and fences are often not explained in the same context.

      1 reply 0 retweets 0 likes
    5. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      Then, it's not actually very clear what the nonatomic concerns are

      1 reply 0 retweets 0 likes
    6. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      Are we only concerned about torn writes? Compiler-driven reorderings? CPU driven reorderings?

      1 reply 0 retweets 0 likes
    7. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      Also x86 actually eliminates classes of these which only further muddies the waters

      1 reply 0 retweets 1 like
    8. Manish‏ @ManishEarth 14 Aug 2017
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      Replying to @ManishEarth

      I think I've understood the pedagogical *problem* here but not enough to have a solution.

      2 replies 0 retweets 0 likes
    9. ʟʟoɢiq‏ @llogiq 15 Aug 2017
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      Replying to @ManishEarth

      @shipilev has some great material on the (fairly similar) Java Memory Model. Perhaps this helps.

      2 replies 0 retweets 0 likes
    10. Stjepan Glavina‏ @stjepang 15 Aug 2017
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      Replying to @llogiq @ManishEarth @shipilev

      Jeff Preshing's blog has the best explanation of atomics and fences: http://preshing.com/archives/ 

      1 reply 0 retweets 3 likes
      Stjepan Glavina‏ @stjepang 15 Aug 2017
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      Replying to @stjepang @llogiq and

      Atomics prevent torn writes. Fences and atomics with stronger-than-Relaxed orderings also prevent some compiler and CPU driven reorderings.

      8:31 AM - 15 Aug 2017
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      • Manish ʟʟoɢiq
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