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io: optimize shutdown check on I/O operations (#5300)

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The global flag remains and is used to prevent duplicated shutdowns and
new io operations after shutdown.

On shutdown, the driver flips the shutdown flag of every pending io
operations and wake them to fail with a shutdown error.

Fixes: #5227
This commit is contained in:
Hyeonu Park
2022-12-27 10:40:41 -08:00
committed by GitHub
parent b75dba6904
commit 9af2f5ee59
4 changed files with 40 additions and 45 deletions
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tokio/docs/reactor-refactor.md
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@@ -188,12 +188,12 @@ readiness, the driver's tick is packed into the atomic `usize`.
The `ScheduledIo` readiness `AtomicUsize` is structured as:
```
| reserved | generation | driver tick | readiness |
| shutdown | generation | driver tick | readiness |
|----------+------------+--------------+-----------|
| 1 bit | 7 bits + 8 bits + 16 bits |
```
The `reserved` and `generation` components exist today.
The `shutdown` and `generation` components exist today.
The `readiness()` function returns a `ReadyEvent` value. This value includes the
`tick` component read with the resource's readiness value. When