Add note about in-memory representation of atomic types #253
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787: Do not provide AtomicCell when cfg(crossbeam_loom) is enabled r=taiki-e a=taiki-e We cannot provide AtomicCell under `cfg(crossbeam_loom)` because loom's atomic types have a different in-memory representation than the underlying type. (tokio-rs/loom#253) https://github.com/crossbeam-rs/crossbeam/blob/bd83e1f2328e90298fc8a2f535a25d94ece09152/crossbeam-utils/src/atomic/atomic_cell.rs#L35-L42 fyi `@jonhoo` Co-authored-by: Taiki Endo <[email protected]>
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# 0.5.5 (May 10, 2022) ### Added - sync: Add `Arc::from_std` without `T: Sized` bound (#226) - sync: Implement `Debug` for `AtomicPtr` for all `T` (#255) - logs: Add location tracking for threads and atomic operations (#258) - logs: Add additional location tracking to `Arc`, `alloc`, and `mpsc` (#265) - logs: Improve `tracing` configuration for `LOOM_LOG` (#266) - logs: Add a span for the current model's iteration (#267) ### Documented - Add note about in-memory representation of atomic types (#253) - Document `LOOM_LOG` syntax (#257) ### Fixed - Fix double panic when exceeding the branch limit in `Drop` (#245) - cell: Allow using `{Mut,Const}Ptr::{deref,with}` when the pointee is `!Sized` (#247) - thread: Fix semantics of `thread::park` after `Thread::unpark` (#250)
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# 0.5.5 (May 10, 2022) ### Added - sync: Add `Arc::from_std` without `T: Sized` bound (#226) - sync: Implement `Debug` for `AtomicPtr` for all `T` (#255) - logs: Add location tracking for threads and atomic operations (#258) - logs: Add additional location tracking to `Arc`, `alloc`, and `mpsc` (#265) - logs: Improve `tracing` configuration for `LOOM_LOG` (#266) - logs: Add a span for the current model's iteration (#267) ### Documented - Add note about in-memory representation of atomic types (#253) - Document `LOOM_LOG` syntax (#257) ### Fixed - Fix double panic when exceeding the branch limit in `Drop` (#245) - cell: Allow using `{Mut,Const}Ptr::{deref,with}` when the pointee is `!Sized` (#247) - thread: Fix semantics of `thread::park` after `Thread::unpark` (#250)
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std's atomic types have the same in-memory representation as the underlying type.
https://doc.rust-lang.org/nightly/core/sync/atomic/struct.AtomicUsize.html
loom's atomic types have a different in-memory representation than the underlying type. (it is an index in the store)