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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 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
    2. 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
    3. 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
    4. 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
    5. 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/ 

      2 replies 0 retweets 12 likes
    6. 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
    7. 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
    8. Benjamin Brittain‏ @Brittain_Ben 5 Sep 2019
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      Replying to @Gankra_ @andy_kelley and

      Has anyone done a solid intrusive data structure library yet using Pin (to the best of your knowledge)? This is something I'll be wanting in the near future (and if does not exist, will write)

      1 reply 0 retweets 4 likes
    9. Ehsan‏ @ehsanmok 5 Sep 2019
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      Replying to @Brittain_Ben @Gankra_ and

      There is, but don't think it uses Pin at all:https://github.com/Amanieu/intrusive-rs …

      1 reply 0 retweets 0 likes
    10. Benjamin Brittain‏ @Brittain_Ben 5 Sep 2019
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      Replying to @ehsanmok @Gankra_ and

      Yeah, I've seen this before. It does not use Pin

      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 5 Sep 2019
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      Replying to @Brittain_Ben @ehsanmok and

      I kind of wonder if it’s possible to use MTE to make a zero-overhead safe heap with multiple ownership on ARM. Problem is it’s only 4 bits of generation :(

      9:29 PM - 5 Sep 2019
      0 replies 0 retweets 0 likes

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