Enum WaitStrategy 

pub enum WaitStrategy {
    BusySpin,
    YieldSpin,
    BackoffSpin,
    Adaptive {
        spin_iters: u32,
        yield_iters: u32,
    },
}

Strategy for blocking recv() and SubscriberGroup::recv().

All variants are no_std compatible — no OS thread primitives required.

Strategy	Latency	CPU usage	Best for
BusySpin	Lowest (~0 ns wakeup)	100% core	Dedicated, pinned cores
YieldSpin	Low (~30 ns on x86)	High	Shared cores, SMT
BackoffSpin	Medium (exponential)	Decreasing	Background consumers
Adaptive	Auto-scaling	Varies	General purpose

Variants

BusySpin

Pure busy-spin with no PAUSE instruction. Minimum wakeup latency but consumes 100% of one CPU core. Use on dedicated, pinned cores.

YieldSpin

Spin with core::hint::spin_loop() (PAUSE on x86, YIELD on ARM) between iterations. Yields the CPU pipeline to the SMT sibling and reduces power consumption vs BusySpin.

BackoffSpin

Exponential backoff spin. Starts with bare spins, then escalates to PAUSE-based spins with increasing delays. Good for consumers that may be idle for extended periods without burning a full core.

Adaptive

Three-phase escalation: bare spin for spin_iters iterations, then PAUSE-spin for yield_iters, then repeated PAUSE bursts.

Fields

spin_iters: u32

Number of bare-spin iterations before escalating to PAUSE.

yield_iters: u32

Number of PAUSE iterations before entering deep backoff.

Trait Implementations

impl Clone for WaitStrategy

fn clone(&self) -> WaitStrategy

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for WaitStrategy

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

Formats the value using the given formatter.

impl Default for WaitStrategy

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for WaitStrategy

fn eq(&self, other: &WaitStrategy) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for WaitStrategy

impl Eq for WaitStrategy

impl StructuralPartialEq for WaitStrategy