Use u32 instead of i32 for futexes. #96040
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Use u32 instead of i32 for futexes. This changes futexes from i32 to u32. The [Linux man page](https://man7.org/linux/man-pages/man2/futex.2.html) uses `uint32_t` for them, so I'm not sure why I used i32 for them. Maybe because I first used them for thread parkers, where I used -1, 0, and 1 as the states. (Wasm's `memory.atomic.wait32` does use `i32`, because wasm doesn't support `u32`.) It doesn't matter much, but using the unsigned type probably results in fewer surprises when shifting bits around or using comparison operators. r? `@Amanieu`
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Use u32 instead of i32 for futexes. This changes futexes from i32 to u32. The [Linux man page](https://man7.org/linux/man-pages/man2/futex.2.html) uses `uint32_t` for them, so I'm not sure why I used i32 for them. Maybe because I first used them for thread parkers, where I used -1, 0, and 1 as the states. (Wasm's `memory.atomic.wait32` does use `i32`, because wasm doesn't support `u32`.) It doesn't matter much, but using the unsigned type probably results in fewer surprises when shifting bits around or using comparison operators. r? ``@Amanieu``
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Rollup of 11 pull requests Successful merges: - rust-lang#94457 (Stabilize `derive_default_enum`) - rust-lang#94461 (Create (unstable) 2024 edition) - rust-lang#94849 (Check var scope if it exist) - rust-lang#95194 (remove find_use_placement) - rust-lang#95749 (only downgrade selection Error -> Ambiguous if type error is in predicate) - rust-lang#96026 (couple of clippy::complexity fixes) - rust-lang#96027 (remove function parameters only used in recursion) - rust-lang#96034 ([test] Add test cases of untested functions for BTreeSet ) - rust-lang#96040 (Use u32 instead of i32 for futexes.) - rust-lang#96062 (docs: Update tests chapter for Termination stabilization) - rust-lang#96065 (Refactor: Use `format-args-capture` and remove unnecessary nested blocks in rustc_typeck) Failed merges: r? `@ghost` `@rustbot` modify labels: rollup
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This changes futexes from i32 to u32. The Linux man page uses
uint32_tfor them, so I'm not sure why I used i32 for them. Maybe because I first used them for thread parkers, where I used -1, 0, and 1 as the states.(Wasm's
memory.atomic.wait32does usei32, because wasm doesn't supportu32.)It doesn't matter much, but using the unsigned type probably results in fewer surprises when shifting bits around or using comparison operators.
r? @Amanieu