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really_bz's profile
Boris
Boris
Boris
@really_bz

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Boris

@really_bz

Used to be bz_moz

Joined May 2011

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    1. Boris‏ @really_bz 13 Nov 2019
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      Public service announcement: steps running in parallel should not be reading, much less modifying, any state directly observable outside those steps. Anything like that needs to happen via tasks.

      2 replies 0 retweets 15 likes
    2. Jake Archibald‏ @jaffathecake 13 Nov 2019
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      Replying to @really_bz @bz_moz

      Can multiple instances of parallel steps observe the same data? For example, doing n things in parallel and doing something once all compete

      1 reply 0 retweets 0 likes
    3. Jake Archibald‏ @jaffathecake 13 Nov 2019
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      Replying to @jaffathecake @bz_moz

      For instance: https://wicg.github.io/background-fetch/#perform-a-background-fetch-algorithm …

      1 reply 0 retweets 0 likes
    4. Boris‏ @really_bz 13 Nov 2019
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      Replying to @jaffathecake

      Good question. The mental model is that it's possible to run every parallel section in its own thread. Access to shared state (e.g. `settledFetches` and `immediateFailure`) should be serialized via tasks. In this case, atomic increment is probably enough, though...

      1 reply 0 retweets 2 likes
      Boris‏ @really_bz 13 Nov 2019
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      Replying to @really_bz @jaffathecake

      And in particular, the observable behavior assuming the increments are atomic is no different from the case when tasks are used. Since nothing outside this algorithm can observe the state, I think it's OK.

      8:39 PM - 13 Nov 2019
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      • o0Ignition0o Jake Archibald
      1 reply 0 retweets 2 likes
        1. New conversation
        2. Jake Archibald‏ @jaffathecake 13 Nov 2019
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          Replying to @really_bz @bz_moz

          Agreed. I didn't want to use tasks for synchronisation in this case because that suggests a return to the main that isn't necessary (until later in the process)

          1 reply 0 retweets 0 likes
        3. Jake Archibald‏ @jaffathecake 13 Nov 2019
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          Replying to @jaffathecake @bz_moz

          the main thread*

          0 replies 0 retweets 0 likes
        4. End of conversation

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