Unix RwLock: avoid racy access to write_locked #55865
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r? @TimNN (rust_highfive has picked a reviewer for you, use r? to override) |
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r? @alexcrichton (who initially (re-)wrote the code) cc @Amanieu who worked on this somewhat more recently. (This patch looks reasonable, but I'd like someone more familiar with the topic / that code to look it over). |
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@bors: r+ |
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📌 Commit db13390 has been approved by |
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pietroalbini
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Unix RwLock: avoid racy access to write_locked We should only access `write_locked` if we really got the lock.
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Rollup of 17 pull requests Successful merges: - #55182 (Redox: Update to new changes) - #55211 (Add BufWriter::buffer method) - #55507 (Add link to std::mem::size_of to size_of intrinsic documentation) - #55530 (Speed up String::from_utf16) - #55556 (Use `Mmap` to open the rmeta file.) - #55622 (NetBSD: link libstd with librt in addition to libpthread) - #55750 (Make `NodeId` and `HirLocalId` `newtype_index`) - #55778 (Wrap some query results in `Lrc`.) - #55781 (More precise spans for temps and their drops) - #55785 (Add mem::forget_unsized() for forgetting unsized values) - #55852 (Rewrite `...` as `..=` as a `MachineApplicable` 2018 idiom lint) - #55865 (Unix RwLock: avoid racy access to write_locked) - #55901 (fix various typos in doc comments) - #55926 (Change sidebar selector to fix compatibility with docs.rs) - #55930 (A handful of hir tweaks) - #55932 (core/char: Speed up `to_digit()` for `radix <= 10`) - #55956 (add tests for some fixed ICEs) Failed merges: r? @ghost
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May 5, 2020
Explain our RwLock implementation Turns out that [with the latest POSIX docs](https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_rwlock_wrlock.html), our `RwLock` implementation is actually correct. However, we cannot fully rely on that due to bugs in older glibc (fix released in 2016). Update the comments to explain that. I also clarified our Mutex docs a bit and fixed another instance of rust-lang#55865. r? @Amanieu Fixes rust-lang#53127
Dylan-DPC-zz
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May 5, 2020
Explain our RwLock implementation Turns out that [with the latest POSIX docs](https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_rwlock_wrlock.html), our `RwLock` implementation is actually correct. However, we cannot fully rely on that due to bugs in older glibc (fix released in 2016). Update the comments to explain that. I also clarified our Mutex docs a bit and fixed another instance of rust-lang#55865. r? @Amanieu Fixes rust-lang#53127
Dylan-DPC-zz
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May 5, 2020
Explain our RwLock implementation Turns out that [with the latest POSIX docs](https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_rwlock_wrlock.html), our `RwLock` implementation is actually correct. However, we cannot fully rely on that due to bugs in older glibc (fix released in 2016). Update the comments to explain that. I also clarified our Mutex docs a bit and fixed another instance of rust-lang#55865. r? @Amanieu Fixes rust-lang#53127
Dylan-DPC-zz
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May 5, 2020
Explain our RwLock implementation Turns out that [with the latest POSIX docs](https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_rwlock_wrlock.html), our `RwLock` implementation is actually correct. However, we cannot fully rely on that due to bugs in older glibc (fix released in 2016). Update the comments to explain that. I also clarified our Mutex docs a bit and fixed another instance of rust-lang#55865. r? @Amanieu Fixes rust-lang#53127
Dylan-DPC-zz
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May 6, 2020
Explain our RwLock implementation Turns out that [with the latest POSIX docs](https://pubs.opengroup.org/onlinepubs/9699919799/functions/pthread_rwlock_wrlock.html), our `RwLock` implementation is actually correct. However, we cannot fully rely on that due to bugs in older glibc (fix released in 2016). Update the comments to explain that. I also clarified our Mutex docs a bit and fixed another instance of rust-lang#55865. r? @Amanieu Fixes rust-lang#53127
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We should only access
write_lockedif we really got the lock.