Struct AuthGate 

pub struct AuthGate(/* private fields */);

Whether a connection has got past the door, shared by everything that asks.

One flag with three readers in three modules — the accept loop’s eviction candidacy (D80), the bound on how long a connection may say nothing (D76), and the stream allowance above (D98) — and one of those is not a read at all but a transition: the raise happens on the false-to-true edge and must happen exactly once, however many requests authenticate at the same moment.

A newtype rather than the Arc<AtomicBool> it wraps, because that invariant cannot survive as a convention across three modules: a plain store(true) written anywhere in them compiles and silently skips the raise. There is no way to open this gate without being told whether you were the one who opened it.

Implementations

impl AuthGate

pub fn closed() -> Self

A gate nothing has passed yet.

pub fn mark(&self) -> bool

Records that a request got past the door; true if it was the first.

Relaxed for the same reason the reads are: what is ordered against is the flag itself, and a swap names exactly one caller the first however many race.

pub fn is_open(&self) -> bool

Whether anything has.

Trait Implementations

impl Clone for AuthGate

fn clone(&self) -> AuthGate

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for AuthGate

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for AuthGate

fn default() -> AuthGate

Returns the “default value” for a type.