32 lines
1.2 KiB
Rust
32 lines
1.2 KiB
Rust
//! Atomic types.
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//!
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//! * [`AtomicCell`], a thread-safe mutable memory location.
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//! * [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering.
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#[cfg(target_has_atomic = "ptr")]
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#[cfg(not(crossbeam_loom))]
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// Use "wide" sequence lock if the pointer width <= 32 for preventing its counter against wrap
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// around.
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//
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// In narrow architectures (pointer width <= 16), the counter is still <= 32-bit and may be
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// vulnerable to wrap around. But it's mostly okay, since in such a primitive hardware, the
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// counter will not be increased that fast.
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// Note that Rust (and C99) pointers must be at least 16-bits: https://github.com/rust-lang/rust/pull/49305
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#[cfg_attr(
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any(target_pointer_width = "16", target_pointer_width = "32"),
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path = "seq_lock_wide.rs"
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)]
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mod seq_lock;
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#[cfg(target_has_atomic = "ptr")]
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// We cannot provide AtomicCell under cfg(crossbeam_loom) because loom's atomic
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// types have a different in-memory representation than the underlying type.
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// TODO: The latest loom supports fences, so fallback using seqlock may be available.
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#[cfg(not(crossbeam_loom))]
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mod atomic_cell;
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#[cfg(target_has_atomic = "ptr")]
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#[cfg(not(crossbeam_loom))]
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pub use atomic_cell::AtomicCell;
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mod consume;
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pub use consume::AtomicConsume;
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