Cynosure

A group of high performance, lightweight datastructures mostly optimized for usage in single-threaded async executors, but some structures can be used elsewhere. Zero dependencies by default.

The crate is split into site_c and site_d. site_c are single-thread only, and site_d primitives work across multiple threads.

site_c

• LocalCell: Rc<RefCell<T>>-like structure without runtime checks with scoped mutable access. Intentionally doesn't work over await points.
• LocalMutex: Fast single-threaded mutex. Use when you do want to hold over await points.
• LocalRwLock: Fast single-threaded reader-writer lock. Allows multiple concurrent readers or one exclusive writer.
• Queue: Double-ended queue that stores up to N items inline before spilling to heap.

site_d

• RingBuf: lock-free SPSC ring buffer with async and sync support.
• TripleBuffer: lock-free SPSC asynchronous triple buffer