| //! Atomic types. |
| //! |
| //! * [`AtomicCell`], a thread-safe mutable memory location. |
| //! * [`AtomicConsume`], for reading from primitive atomic types with "consume" ordering. |
| |
| #[cfg(not(crossbeam_no_atomic_cas))] |
| #[cfg(not(crossbeam_loom))] |
| cfg_if::cfg_if! { |
| // Use "wide" sequence lock if the pointer width <= 32 for preventing its counter against wrap |
| // around. |
| // |
| // We are ignoring too wide architectures (pointer width >= 256), since such a system will not |
| // appear in a conceivable future. |
| // |
| // In narrow architectures (pointer width <= 16), the counter is still <= 32-bit and may be |
| // vulnerable to wrap around. But it's mostly okay, since in such a primitive hardware, the |
| // counter will not be increased that fast. |
| if #[cfg(any(target_pointer_width = "64", target_pointer_width = "128"))] { |
| mod seq_lock; |
| } else { |
| #[path = "seq_lock_wide.rs"] |
| mod seq_lock; |
| } |
| } |
| |
| #[cfg(not(crossbeam_no_atomic_cas))] |
| mod atomic_cell; |
| mod consume; |
| |
| #[cfg(not(crossbeam_no_atomic_cas))] |
| pub use self::atomic_cell::AtomicCell; |
| pub use self::consume::AtomicConsume; |