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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @shipilev

      I did not know that! <the unplumbed depths of the human soul become visible> Apparently Go's memory safety in race conditions is "not a problem in practice" because they have a race detector.

      3 replies 0 retweets 3 likes
    2. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @erikcorry @shipilev

      https://research.swtch.com/gorace 

      1 reply 0 retweets 0 likes
    3. ᎬᎡᎥᏦ‏ @erikcorry 7 Dec 2019
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      Replying to @erikcorry @shipilev

      https://news.ycombinator.com/item?id=5759919 

      2 replies 0 retweets 0 likes
    4. Aleksey Shipilëv‏ @shipilev 7 Dec 2019
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      Replying to @erikcorry

      Ugh. I wonder if this is still true today! Having critical metadata spanning multiple words is downright odd, and basically quality-of-implementation issue. Hotspot does a few sacrifices to avoid this (e.g. aligning objects by 8 to have aligned headers).

      2 replies 0 retweets 1 like
    5. Aleksey Shipilëv‏ @shipilev 7 Dec 2019
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      Replying to @shipilev @erikcorry

      Separately, it is morbidly amusing how many think the worst case is segfault or some sort of security exploit. My nightmare is software corrupting (my medical, financial, personal) data and then persisting that corruption everywhere with no way to recover later.

      5 replies 14 retweets 71 likes
    6. Patrick Walton‏ @pcwalton 7 Dec 2019
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      Replying to @shipilev @erikcorry

      That is a good point. I should have made the argument about memory corruption instead of RCE 5 years ago in that thread.

      1 reply 0 retweets 11 likes
    7. Roberto Clapis  🏳️‍🌈⚤ 🇪🇺 🇮🇹 🇨🇭‏ @empijei 7 Dec 2019
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      Replying to @pcwalton @shipilev @erikcorry

      I thought that basically any language in existence had problems and races that can corrupt data and business logic. I know for example that Rust grants that even under a race you don't get memory corruption but data corruption is still there.

      1 reply 0 retweets 0 likes
    8. Roberto Clapis  🏳️‍🌈⚤ 🇪🇺 🇮🇹 🇨🇭‏ @empijei 7 Dec 2019
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      Replying to @empijei @pcwalton and

      You can't prevent people from using locks in a wrong way. 🤷‍♂️

      1 reply 0 retweets 2 likes
    9. Patrick Walton‏ @pcwalton 8 Dec 2019
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      Replying to @empijei @shipilev @erikcorry

      It’s a matter of degree. Rust makes it hard to misuse locks because you have to explicitly declare your synchronization semantics before the compiler will let you share data between threads. Java doesn’t require that, but still enforces memory safety. Go doesn’t.

      1 reply 0 retweets 3 likes
    10. Roberto Clapis  🏳️‍🌈⚤ 🇪🇺 🇮🇹 🇨🇭‏ @empijei 8 Dec 2019
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      Replying to @pcwalton @shipilev @erikcorry

      The most common race that i see in code review is: Acquire readlock Make decisions Release readlock Acquire writelock Do smth based on previous decisions Release writelock Does Rust have smth to prevent that?

      1 reply 0 retweets 1 like
      Patrick Walton‏ @pcwalton 8 Dec 2019
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      Replying to @empijei @shipilev @erikcorry

      There are legitimate reasons you might want to do that, so no. But your example would often be more awkward than doing things the right way because you’d have to borrow multiple times. I haven’t seen that error much in Rust but I’m sure it happens. https://doc.rust-lang.org/std/sync/struct.RwLock.html …

      9:24 AM - 8 Dec 2019
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