rt: fix new yield_now behavior with block_in_place #5251
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PR #5223 changed the behavior of `yield_now()` to store yielded tasks and notify them *after* polling the resource drivers. This PR fixes a couple of bugs with this new behavior when combined with `block_in_place()`. First, we need to avoid freeing the deferred task queue when exiting a runtime if it is *not* the root runtime. Because `block_in_place()` allows a user to start a new runtime from within an existing task, this check is necessary. Second, when a worker core is stolen from a thread during a `block_in_place()` call, we need to ensure that deferred tasks are notified anyway.
carllerche
added
C-bug
carllerche
commented
Dec 1, 2022
| // Catching panics on worker threads in tests is quite tricky. Instead, when | ||
| // debug assertions are enabled, we just abort the process. | ||
| #[cfg(debug_assertions)] | ||
| let _abort_on_panic = AbortOnPanic; |
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This is just for tests and hopefully catching issues sooner.
Noah-Kennedy
approved these changes
Dec 2, 2022
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PR #5223 changed the behavior of
yield_now()to store yielded tasks and notify them after polling the resource drivers. This PR fixes two bugs with this new behavior when combined withblock_in_place().First, we must avoid freeing the deferred task queue when exiting a runtime if it is not the root runtime. Because
block_in_place()allows a user to start a new runtime from within an existing task, this check is necessary.Second, when a worker core is stolen from a thread during a
block_in_place()call, we need to ensure that deferred tasks are notified.