worker: refactor thread id management #25796
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| Debug(this, "Set up worker with id %llu", thread_id_); | ||
| wrap->Set(env->context(), | ||
| env->thread_id_string(), | ||
| Number::New(env->isolate(), static_cast<double>(thread_id_))) |
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Now come to think of it, maybe this should be a BigInt?
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@nodejs/workers Thoughts? BigInt seems like it might be a bit much, but since it’s really just an identifier, that might be okay?
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In order to be relevant that'd require spawning more than 9,007,199,254,740,991 threads.
If we can spawn 1000 threads every seconds (a lot) and our program does nothing but spawn threads and we disregard any other limit or cleanup - it would take us ~285,616 years to exhaust that number of threads and overflow.
9007199254740991 / 1000 (threads per second) / 60 (seconds per minute) / 60 (minutes per hour) / 24 (hours per day) / 365 (days per year) = ~285616
If our machine is super fast and we spawn 100,000 threads per second instead, it would still take us over 2000 years. I certainly hope no one is going to run a Node.js server for that long.
I think a double is fine 😅
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Rebased due to merge conflicts, CI: https://ci.nodejs.org/job/node-test-pull-request/20418/ |
jasnell
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benjamingr
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lundibundi
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Jan 30, 2019
- Assign thread IDs to `Environment` instances, rather than Workers. This is more embedder-friendly than the current system, in which all “main threads” (if there are multiple ones) would get the id `0`. - Because that means that `isMainThread === (threadId === 0)` no longer holds, refactor `isMainThread` into a separate entity. Implement it in a way that allows for future extensibility, because we use `isMainThread` in multiple different ways (determining whether there is a parent thread; determining whether the current thread has control of the current process; etc.).
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Sigh … rebased again. |
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- Assign thread IDs to `Environment` instances, rather than Workers. This is more embedder-friendly than the current system, in which all “main threads” (if there are multiple ones) would get the id `0`. - Because that means that `isMainThread === (threadId === 0)` no longer holds, refactor `isMainThread` into a separate entity. Implement it in a way that allows for future extensibility, because we use `isMainThread` in multiple different ways (determining whether there is a parent thread; determining whether the current thread has control of the current process; etc.). PR-URL: #25796 Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Denys Otrishko <[email protected]>
targos
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- Assign thread IDs to `Environment` instances, rather than Workers. This is more embedder-friendly than the current system, in which all “main threads” (if there are multiple ones) would get the id `0`. - Because that means that `isMainThread === (threadId === 0)` no longer holds, refactor `isMainThread` into a separate entity. Implement it in a way that allows for future extensibility, because we use `isMainThread` in multiple different ways (determining whether there is a parent thread; determining whether the current thread has control of the current process; etc.). PR-URL: #25796 Reviewed-By: Joyee Cheung <[email protected]> Reviewed-By: James M Snell <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]> Reviewed-By: Denys Otrishko <[email protected]>
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This was referenced Feb 15, 2019
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Environmentinstances, rather than Workers.This is more embedder-friendly than the current system, in which
all “main threads” (if there are multiple ones) would get the
id
0.isMainThread === (threadId === 0)no longerholds, refactor
isMainThreadinto a separate entity. Implement itin a way that allows for future extensibility, because we use
isMainThreadin multiple different ways (determining whether thereis a parent thread; determining whether the current thread has control
of the current process; etc.).
Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passes