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Auto merge of #136965 - jhpratt:rollup-bsnqvmf, r=jhpratt 

Rollup of 8 pull requests

Successful merges:

 - #134999 (Add cygwin target.)
 - #136559 (Resolve named regions when reporting type test failures in NLL)
 - #136660 (Use a trait to enforce field validity for union fields + `unsafe` fields + `unsafe<>` binder types)
 - #136858 (Parallel-compiler-related cleanup)
 - #136881 (cg_llvm: Reduce visibility of all functions in the llvm module)
 - #136888 (Always perform discr read for never pattern in EUV)
 - #136948 (Split out the `extern_system_varargs` feature)
 - #136949 (Fix import in bench for wasm)

r? `@ghost`
`@rustbot` modify labels: rollup
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bors 2025-02-13 11:45:11 +00:00
parent c8b6df4cd9 8c82450865
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src/parallel-rustc.md
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@ -46,8 +46,6 @@ are implemented differently depending on whether `parallel-compiler` is true.
| data structure | parallel | non-parallel | | data structure | parallel | non-parallel |
| -------------------------------- | --------------------------------------------------- | ------------ | | -------------------------------- | --------------------------------------------------- | ------------ |
| Weak | std::sync::Weak | std::rc::Weak |
| Atomic{Bool}/{Usize}/{U32}/{U64} | std::sync::atomic::Atomic{Bool}/{Usize}/{U32}/{U64} | (std::cell::Cell<bool/usize/u32/u64>) |
| OnceCell | std::sync::OnceLock | std::cell::OnceCell | | OnceCell | std::sync::OnceLock | std::cell::OnceCell |
| Lock\<T> | (parking_lot::Mutex\<T>) | (std::cell::RefCell) | | Lock\<T> | (parking_lot::Mutex\<T>) | (std::cell::RefCell) |
| RwLock\<T> | (parking_lot::RwLock\<T>) | (std::cell::RefCell) | | RwLock\<T> | (parking_lot::RwLock\<T>) | (std::cell::RefCell) |
@ -58,7 +56,6 @@ are implemented differently depending on whether `parallel-compiler` is true.
| WriteGuard | parking_lot::RwLockWriteGuard | std::cell::RefMut | | WriteGuard | parking_lot::RwLockWriteGuard | std::cell::RefMut |
| MappedWriteGuard | parking_lot::MappedRwLockWriteGuard | std::cell::RefMut | | MappedWriteGuard | parking_lot::MappedRwLockWriteGuard | std::cell::RefMut |
| LockGuard | parking_lot::MutexGuard | std::cell::RefMut | | LockGuard | parking_lot::MutexGuard | std::cell::RefMut |
| MappedLockGuard | parking_lot::MappedMutexGuard | std::cell::RefMut |
- These thread-safe data structures are interspersed during compilation which - These thread-safe data structures are interspersed during compilation which
can cause lock contention resulting in degraded performance as the number of can cause lock contention resulting in degraded performance as the number of
@ -173,12 +170,10 @@ Here are some resources that can be used to learn more:
- [This list of interior mutability in the compiler by nikomatsakis][imlist] - [This list of interior mutability in the compiler by nikomatsakis][imlist]
[`rayon`]: https://crates.io/crates/rayon [`rayon`]: https://crates.io/crates/rayon
[Arc]: https://doc.rust-lang.org/std/sync/struct.Arc.html
[imlist]: https://github.com/nikomatsakis/rustc-parallelization/blob/master/interior-mutability-list.md [imlist]: https://github.com/nikomatsakis/rustc-parallelization/blob/master/interior-mutability-list.md
[irlo0]: https://internals.rust-lang.org/t/parallelizing-rustc-using-rayon/6606 [irlo0]: https://internals.rust-lang.org/t/parallelizing-rustc-using-rayon/6606
[irlo1]: https://internals.rust-lang.org/t/help-test-parallel-rustc/11503 [irlo1]: https://internals.rust-lang.org/t/help-test-parallel-rustc/11503
[monomorphization]: backend/monomorph.md [monomorphization]: backend/monomorph.md
[parallel-rustdoc]: https://github.com/rust-lang/rust/issues/82741 [parallel-rustdoc]: https://github.com/rust-lang/rust/issues/82741
[Rc]: https://doc.rust-lang.org/std/rc/struct.Rc.html
[rustc-rayon]: https://github.com/rust-lang/rustc-rayon [rustc-rayon]: https://github.com/rust-lang/rustc-rayon
[tracking]: https://github.com/rust-lang/rust/issues/48685 [tracking]: https://github.com/rust-lang/rust/issues/48685