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epoch: Miri reports SB violation

12

UPDATE(taiki-e): The error originally reported here no longer exists. See https://github.com/crossbeam-rs/crossbeam/issues/545#issuecomment-1192785003 for the remaining SB violations currently reported. The fix for SB violations in epoch exists in https://github.com/crossbeam-rs/crossbeam/pull/871, and using...

YoshikiTakashima

Possible improvements to SegQueue

1

I've been trying to understand the `SegQueue` implementation to reply to #675. These are some notes I took along the way: - https://github.com/crossbeam-rs/crossbeam/blob/b11f1a83e6362589979a4c58c79895cc936b09fb/crossbeam-queue/src/seg_queue.rs#L67 Might be UB? Need to know whether...

SUPERCILEX

AtomicCell for struct's those size is not the power of two

1

Is it possible to use AtomicCell for struct where underlying atomic type is rounded up to the nearest power of two? For example this would use `AtomicU32` ```rust struct Foo...

feelingnothing

I want to create a "Notification center" to facilitate decoupled message passing between parts of my application i.e. similar to https://developer.apple.com/documentation/foundation/nsnotificationcenter I couldn't find an existing solution (maybe you know...

avnerbarr

I need to parse a set of log files and combine them into a single output. We have a few gigs of logs, so takes a few minutes to complete...

ProphetLamb

disconnect receiving side of a channel but consume objects already pushed to the channel

1

Lets say during the process shutdown I want: * The consumer thread process all items _already_ pushed to the channel. * The producer thread stops pushing new items to the...

behzadnouri

Add reduced-collection-frequency for niche use case

1

to be documented related to https://github.com/crossbeam-rs/crossbeam/issues/852

ryoqun

Currently, lock-free data structures such as `ArrayQueue` and `SegQueue` can only be modified via interior mutability (methods accept `&self`). It would be very useful if there was another set of...

JoJoJet

Noticeable overhead in crossbeam-epoch under many Locals

14

Hi, nice to meet you and thanks for maintaining this crate. :) I found some kind of performance issue spanning cross-crate code interactions, ultimately resulting in many cpu cycles being...

ryoqun

`AtomicCell::load()` can return a value that was modified by a concurrent racing `store()` during the loader's critical section

16

It is well known that SeqLocks - the underlying algorithm of `AtomicCell` - rely on data races which is technically always UB, though in practice it is assumed that a...

cbeuw