Struct SpscHeader 

pub struct SpscHeader {
    pub magic: u64,
    pub capacity: u64,
    pub slot_size: u64,
    pub head: AtomicU64,
    pub tail: AtomicU64,
    /* private fields */
}

Header layout for a Lamport SPSC ring. Three cache lines: metadata, then producer-owned head, then consumer-owned tail. Separate cache lines for head and tail eliminate false sharing between producer and consumer hot paths.

Fields

magic: u64

capacity: u64

slot_size: u64

head: AtomicU64

Producer-owned head counter; consumer reads via Acquire.

tail: AtomicU64

Consumer-owned tail counter; producer reads via Acquire.