rt: fix accidental unsetting of current handle #5178
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An earlier change updated `enter_runtime` to also set the current handle. However, the change did not store the `SetCurrentGuard`, so the "current handle" was immediately unset. This patch stores the the `SetCurrentGuard` in the `EnterRuntimeGuard`. No existing test exposed this bug because all tests went via `Runtime` instead of `Handle`. Currently, `Runtime` is still explicitly setting the handle before entering runtime, so all tests still passed. A new test is added that covers the case of calling `Handle::block_on` and accessing the current handle.
carllerche
commented
Nov 9, 2022
| @@ -74,6 +74,7 @@ cfg_rt! { | |||
| use std::fmt; | |||
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| #[derive(Debug, Clone, Copy)] | |||
| #[must_use] | |||
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carllerche
commented
Nov 9, 2022
| @@ -243,14 +243,6 @@ rt_test! { | |||
| tokio::spawn(async move { | |||
| let (done_tx, mut done_rx) = mpsc::unbounded_channel(); | |||
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| /* | |||
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Darksonn
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Nov 9, 2022
carllerche
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crapStone
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Nov 22, 2022
This PR contains the following updates: | Package | Type | Update | Change | |---|---|---|---| | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dependencies | minor | `1.21.2` -> `1.22.0` | | [tokio](https://tokio.rs) ([source](https://github.com/tokio-rs/tokio)) | dev-dependencies | minor | `1.21.2` -> `1.22.0` | --- ### Release Notes <details> <summary>tokio-rs/tokio</summary> ### [`v1.22.0`](https://github.com/tokio-rs/tokio/releases/tag/tokio-1.22.0): Tokio v1.22.0 [Compare Source](tokio-rs/tokio@tokio-1.21.2...tokio-1.22.0) ##### Added - runtime: add `Handle::runtime_flavor` ([#​5138]) - sync: add `Mutex::blocking_lock_owned` ([#​5130]) - sync: add `Semaphore::MAX_PERMITS` ([#​5144]) - sync: add `merge()` to semaphore permits ([#​4948]) - sync: add `mpsc::WeakUnboundedSender` ([#​5189]) ##### Added (unstable) - process: add `Command::process_group` ([#​5114]) - runtime: export metrics about the blocking thread pool ([#​5161]) - task: add `task::id()` and `task::try_id()` ([#​5171]) ##### Fixed - macros: don't take ownership of futures in macros ([#​5087]) - runtime: fix Stacked Borrows violation in `LocalOwnedTasks` ([#​5099]) - runtime: mitigate ABA with 32-bit queue indices when possible ([#​5042]) - task: wake local tasks to the local queue when woken by the same thread ([#​5095]) - time: panic in release mode when `mark_pending` called illegally ([#​5093]) - runtime: fix typo in expect message ([#​5169]) - runtime: fix `unsync_load` on atomic types ([#​5175]) - task: elaborate safety comments in task deallocation ([#​5172]) - runtime: fix `LocalSet` drop in thread local ([#​5179]) - net: remove libc type leakage in a public API ([#​5191]) - runtime: update the alignment of `CachePadded` ([#​5106]) ##### Changed - io: make `tokio::io::copy` continue filling the buffer when writer stalls ([#​5066]) - runtime: remove `coop::budget` from `LocalSet::run_until` ([#​5155]) - sync: make `Notify` panic safe ([#​5154]) ##### Documented - io: fix doc for `write_i8` to use signed integers ([#​5040]) - net: fix doc typos for TCP and UDP `set_tos` methods ([#​5073]) - net: fix function name in `UdpSocket::recv` documentation ([#​5150]) - sync: typo in `TryLockError` for `RwLock::try_write` ([#​5160]) - task: document that spawned tasks execute immediately ([#​5117]) - time: document return type of `timeout` ([#​5118]) - time: document that `timeout` checks only before poll ([#​5126]) - sync: specify return type of `oneshot::Receiver` in docs ([#​5198]) ##### Internal changes - runtime: use const `Mutex::new` for globals ([#​5061]) - runtime: remove `Option` around `mio::Events` in io driver ([#​5078]) - runtime: remove a conditional compilation clause ([#​5104]) - runtime: remove a reference to internal time handle ([#​5107]) - runtime: misc time driver cleanup ([#​5120]) - runtime: move signal driver to runtime module ([#​5121]) - runtime: signal driver now uses I/O driver directly ([#​5125]) - runtime: start decoupling I/O driver and I/O handle ([#​5127]) - runtime: switch `io::handle` refs with scheduler:Handle ([#​5128]) - runtime: remove Arc from I/O driver ([#​5134]) - runtime: use signal driver handle via `scheduler::Handle` ([#​5135]) - runtime: move internal clock fns out of context ([#​5139]) - runtime: remove `runtime::context` module ([#​5140]) - runtime: keep driver cfgs in `driver.rs` ([#​5141]) - runtime: add `runtime::context` to unify thread-locals ([#​5143]) - runtime: rename some confusing internal variables/fns ([#​5151]) - runtime: move `coop` mod into `runtime` ([#​5152]) - runtime: move budget state to context thread-local ([#​5157]) - runtime: move park logic into runtime module ([#​5158]) - runtime: move `Runtime` into its own file ([#​5159]) - runtime: unify entering a runtime with `Handle::enter` ([#​5163]) - runtime: remove handle reference from each scheduler ([#​5166]) - runtime: move `enter` into `context` ([#​5167]) - runtime: combine context and entered thread-locals ([#​5168]) - runtime: fix accidental unsetting of current handle ([#​5178]) - runtime: move `CoreStage` methods to `Core` ([#​5182]) - sync: name mpsc semaphore types ([#​5146]) [#​4948]: tokio-rs/tokio#4948 [#​5040]: tokio-rs/tokio#5040 [#​5042]: tokio-rs/tokio#5042 [#​5061]: tokio-rs/tokio#5061 [#​5066]: tokio-rs/tokio#5066 [#​5073]: tokio-rs/tokio#5073 [#​5078]: tokio-rs/tokio#5078 [#​5087]: tokio-rs/tokio#5087 [#​5093]: tokio-rs/tokio#5093 [#​5095]: tokio-rs/tokio#5095 [#​5099]: tokio-rs/tokio#5099 [#​5104]: tokio-rs/tokio#5104 [#​5106]: tokio-rs/tokio#5106 [#​5107]: tokio-rs/tokio#5107 [#​5114]: tokio-rs/tokio#5114 [#​5117]: tokio-rs/tokio#5117 [#​5118]: tokio-rs/tokio#5118 [#​5120]: tokio-rs/tokio#5120 [#​5121]: tokio-rs/tokio#5121 [#​5125]: tokio-rs/tokio#5125 [#​5126]: tokio-rs/tokio#5126 [#​5127]: tokio-rs/tokio#5127 [#​5128]: tokio-rs/tokio#5128 [#​5130]: tokio-rs/tokio#5130 [#​5134]: tokio-rs/tokio#5134 [#​5135]: tokio-rs/tokio#5135 [#​5138]: tokio-rs/tokio#5138 [#​5138]: tokio-rs/tokio#5138 [#​5139]: tokio-rs/tokio#5139 [#​5140]: tokio-rs/tokio#5140 [#​5141]: tokio-rs/tokio#5141 [#​5143]: tokio-rs/tokio#5143 [#​5144]: tokio-rs/tokio#5144 [#​5144]: tokio-rs/tokio#5144 [#​5146]: tokio-rs/tokio#5146 [#​5150]: tokio-rs/tokio#5150 [#​5151]: tokio-rs/tokio#5151 [#​5152]: tokio-rs/tokio#5152 [#​5154]: tokio-rs/tokio#5154 [#​5155]: tokio-rs/tokio#5155 [#​5157]: tokio-rs/tokio#5157 [#​5158]: tokio-rs/tokio#5158 [#​5159]: tokio-rs/tokio#5159 [#​5160]: tokio-rs/tokio#5160 [#​5161]: tokio-rs/tokio#5161 [#​5163]: tokio-rs/tokio#5163 [#​5166]: tokio-rs/tokio#5166 [#​5167]: tokio-rs/tokio#5167 [#​5168]: tokio-rs/tokio#5168 [#​5169]: tokio-rs/tokio#5169 [#​5171]: tokio-rs/tokio#5171 [#​5172]: tokio-rs/tokio#5172 [#​5175]: tokio-rs/tokio#5175 [#​5178]: tokio-rs/tokio#5178 [#​5179]: tokio-rs/tokio#5179 [#​5182]: tokio-rs/tokio#5182 [#​5189]: tokio-rs/tokio#5189 [#​5191]: tokio-rs/tokio#5191 [#​5198]: tokio-rs/tokio#5198 </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about these updates again. --- - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate). <!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNC4yNy4xIiwidXBkYXRlZEluVmVyIjoiMzQuMjkuMiJ9--> Co-authored-by: cabr2-bot <[email protected]> Reviewed-on: https://codeberg.org/Calciumdibromid/CaBr2/pulls/1651 Reviewed-by: crapStone <[email protected]> Co-authored-by: Calciumdibromid Bot <[email protected]> Co-committed-by: Calciumdibromid Bot <[email protected]>
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An earlier change updated
enter_runtimeto also set the current handle. However, the change did not store theSetCurrentGuard, so the "current handle" was immediately unset. This patch stores theSetCurrentGuardin theEnterRuntimeGuard.No existing test exposed this bug because all tests went via
Runtimeinstead ofHandle. Currently,Runtimeis still explicitly setting the handle before entering runtime, so all tests still pass. A new test is added that covers the case of callingHandle::block_onand accessing the current handle.