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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. Rich Felker‏ @RichFelker 4 Sep 2019
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      Replying to @RichFelker @pcwalton

      Just because linking to C feels sufficiently "dirty" to the true believers to keep them from doing it. :-)

      1 reply 0 retweets 0 likes
    2. Benjamin Brittain‏ @Brittain_Ben 4 Sep 2019
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      Replying to @RichFelker @pcwalton

      Unsafe still has more protections than C code does though

      1 reply 0 retweets 6 likes
    3. Benjamin Brittain‏ @Brittain_Ben 4 Sep 2019
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      Replying to @Brittain_Ben @RichFelker @pcwalton

      I understand your point though. :) Unsafe needs a higher bar

      1 reply 0 retweets 3 likes
    4. Rich Felker‏ @RichFelker 4 Sep 2019
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      Replying to @Brittain_Ben @pcwalton

      Literally nothing in userspace but ffi and runtime core stuff like heap should use unsafe. There's no need. Anything else is just cutting corners for performance.

      2 replies 0 retweets 1 like
    5. Benjamin Brittain‏ @Brittain_Ben 4 Sep 2019
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      Replying to @RichFelker @pcwalton

      And usually incorrectly/unsoundly 😞

      1 reply 0 retweets 2 likes
    6. Andrew Kelley‏ @andy_kelley 5 Sep 2019
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      Replying to @Brittain_Ben @RichFelker @pcwalton

      You can't implement a linked list without unsafe. Core data structures in std use unsafe and should obviously not link to C code. https://doc.rust-lang.org/src/alloc/collections/linked_list.rs.html#151 …

      2 replies 1 retweet 1 like
    7. Rich Felker‏ @RichFelker 5 Sep 2019
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      Replying to @andy_kelley @Brittain_Ben @pcwalton

      I thought there were ways to do it, just not the obvious most efficient ones. If you really *can't*, that makes me a lot more skeptical of the whole Rust model...

      1 reply 0 retweets 0 likes
    8. Benjamin Brittain‏ @Brittain_Ben 5 Sep 2019
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      Replying to @RichFelker @andy_kelley @pcwalton

      Yes. You can implement naive linked lists without unsafe.

      1 reply 0 retweets 4 likes
    9. Rich Felker‏ @RichFelker 5 Sep 2019
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      Replying to @Brittain_Ben @andy_kelley @pcwalton

      OK. I meant that if the type system Rust bases its memory-safety on didn't admit *any* way to do linked lists without unsafe, the whole formalism would be a lot less impressive/valuable than I thought it was...

      2 replies 0 retweets 0 likes
    10. Andrew Kelley‏ @andy_kelley 5 Sep 2019
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      Replying to @RichFelker @Brittain_Ben @pcwalton

      I didn't even know it was possible, now I want to learn what a linked list looks like without using unsafe

      2 replies 0 retweets 2 likes
      Patrick Walton‏ @pcwalton 5 Sep 2019
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      Replying to @andy_kelley @RichFelker @Brittain_Ben

      .@Gankra_ to the rescue! https://rust-unofficial.github.io/too-many-lists/ 

      8:54 AM - 5 Sep 2019
      • 12 Likes
      • Elazar Leibovich Chris Keele 🥁🥁🎉 and 6 others Barret Rennie 👻🎃 Status Quo 🎃👻 Esteban K – 🦀⚙️@home Yaah 🍑🦀☕ rare liquids Joe Groff Mason Remaley @ Home
      2 replies 0 retweets 12 likes
        1. New conversation
        2. Andrew Kelley‏ @andy_kelley 5 Sep 2019
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          Replying to @pcwalton @RichFelker and

          This is a great resource! One thing- I think I have a unique perspective to bring to the table. Zig's focus on not panicking on OOM has surfaced the linked list as a crucial tool for areas of code where an implementation *must not fail*. Lots of examples in the std lib event loop

          1 reply 0 retweets 4 likes
        3. gankra's gay‏ @Gankra_ 5 Sep 2019
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          Replying to @andy_kelley @pcwalton and

          the core premise of the front page holds: that's a super niche problem (hardening a language's runtime!), and it's not unreasonable to "drop down" to a memory-unsafe system to support it also since this was written, async/await introduced a system for intrusive pointers (Pin)

          1 reply 0 retweets 5 likes
        4. 4 more replies
        1. Lukasz‏ @lukaszsawickiwx 5 Sep 2019
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          Replying to @pcwalton @andy_kelley and

          I genuinely love this writing style. The unsubtle mocking of C-like langs: “If you're coming from a C-like language, this is exactly the enum you know and love, but on meth.” 🤣🤣

          0 replies 0 retweets 0 likes
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