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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. every hero is a policy failure‏ @myrrlyn 29 Apr 2019
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      I need a crash course explanation of processor concurrency fundamentals, such as the #rustlang core::sync::atomic types and fence function. I've just introduced a race condition vulnerability into bitvec and I need to eliminate it with as little cost as possible.

      3 replies 1 retweet 9 likes
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    2. every hero is a policy failure‏ @myrrlyn 29 Apr 2019
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      problem: CPU instructions operate on whole elements, but bitvec types operate on bit regions. Two non-overlapping bitvec type instances can reside in the name element. Manipulation of those instances in parallel will thus race.

      1 reply 0 retweets 2 likes
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    3. every hero is a policy failure‏ @myrrlyn 29 Apr 2019
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      should I require that all backing storage uses Atomic types? should I memory-fence all access? I have the capability in the crate to detect partial-element access, so I can fence just that, with a branch overhead.

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    4. every hero is a policy failure‏ @myrrlyn 29 Apr 2019
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      Expanding: the race condition can only occur on partially-controlled elements. I can branch to detect this, and only fence on partial control, or I can have no branch, and fence all modification. I don't know which is the better behavior. I guess I could bench it,

      2 replies 1 retweet 2 likes
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      Stjepan Glavina‏ @stjepang 29 Apr 2019
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      Replying to @myrrlyn

      Not sure if useful, but check out AtomicCell (it's just a Cell that implements Send+Sync, has zero space overhead, uses atomic instructions when T fits into AtomicUsize, and falls back to spinlocks otherwise - really good spinlocks with optimistic reads): https://docs.rs/crossbeam-utils/0.6.5/crossbeam_utils/atomic/struct.AtomicCell.html …

      2:26 PM - 29 Apr 2019
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        1. Stjepan Glavina‏ @stjepang 29 Apr 2019
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          Replying to @stjepang @myrrlyn

          Also don't know of a quick crash course :( but if you need learning resources for this kind of stuff, take a look athttps://github.com/crossbeam-rs/rfcs/wiki …

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