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doc: explain Worker semantics in async_hooks.md

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PR-URL: https://github.com/nodejs/node/pull/20876
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Shingo Inoue <leko.noor@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Tiancheng "Timothy" Gu <timothygu99@gmail.com>
Reviewed-By: John-David Dalton <john.david.dalton@gmail.com>
Reviewed-By: Gus Caplan <me@gus.host>
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Anna Henningsen 2018-05-22 21:47:06 +02:00
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@ -21,6 +21,9 @@ A resource can also be closed before the callback is called. `AsyncHook` does
not explicitly distinguish between these different cases but will represent them not explicitly distinguish between these different cases but will represent them
as the abstract concept that is a resource. as the abstract concept that is a resource.
If [`Worker`][]s are used, each thread has an independent `async_hooks`
interface, and each thread will use a new set of async IDs.
## Public API ## Public API
### Overview ### Overview
@ -224,7 +227,7 @@ clearTimeout(setTimeout(() => {}, 10));
``` ```
Every new resource is assigned an ID that is unique within the scope of the Every new resource is assigned an ID that is unique within the scope of the
current process. current Node.js instance.
###### `type` ###### `type`
@ -725,3 +728,4 @@ never be called.
[Hook Callbacks]: #async_hooks_hook_callbacks [Hook Callbacks]: #async_hooks_hook_callbacks
[PromiseHooks]: https://docs.google.com/document/d/1rda3yKGHimKIhg5YeoAmCOtyURgsbTH_qaYR79FELlk [PromiseHooks]: https://docs.google.com/document/d/1rda3yKGHimKIhg5YeoAmCOtyURgsbTH_qaYR79FELlk
[promise execution tracking]: #async_hooks_promise_execution_tracking [promise execution tracking]: #async_hooks_promise_execution_tracking
[`Worker`]: worker.html#worker_worker