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rt: yield_now defers task until after driver poll (#5223)

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Previously, calling `task::yield_now().await` would yield the current
task to the scheduler, but the scheduler would poll it again before
polling the resource drivers. This behavior can result in starving the
resource drivers.

This patch creates a queue tracking yielded tasks. The scheduler
notifies those tasks **after** polling the resource drivers.

Refs: #5209
This commit is contained in:
Carl Lerche
2022-11-30 14:21:08 -08:00
committed by GitHub
parent 993a60b7c7
commit 22862739dd
11 changed files with 240 additions and 7 deletions
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.github/workflows/loom.yml
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@@ -45,4 +45,5 @@ jobs:
env:
RUSTFLAGS: --cfg loom --cfg tokio_unstable -Dwarnings
LOOM_MAX_PREEMPTIONS: 2
LOOM_MAX_BRANCHES: 10000
SCOPE: ${{ matrix.scope }}