Enum Priority 

pub enum Priority {
    Critical = 0,
    Normal = 1,
    BestEffort = 2,
}

Criticality bucket for SchedContext. Phase 110.C uses this to pick which RankedFifoSet / BucketedEdfSet slot a callback dispatches through; later phases (110.D) map it to OS priority.

Default Normal keeps existing single-bucket workloads unchanged — every default-Fifo SC sits in Normal, so dispatch order is bit-identical to pre-110.C when no callback opts in to Critical or BestEffort.

Single-thread non-preemption note: a BestEffort callback already running blocks Critical work that becomes ready mid-cycle. Hard- RT scenarios need 110.D’s multi-executor preemption.

Variants

Critical = 0

Highest-priority bucket. Drained first within a single spin_once cycle; non-preemptive against in-flight lower- priority callbacks (see Phase 110.D for preemption).

Normal = 1

Default bucket. Most callbacks (and the auto-default Fifo SC) live here.

BestEffort = 2

Lowest-priority bucket. Drained last; first to be skipped if a future cycle-budget overrun forces an early return.

Implementations

impl Priority

pub const COUNT: usize = 3

pub const fn index(self) -> usize

pub const fn dispatch_level(self, rank: u8) -> u8

phase-509 P2 (RFC-0108 D2) – the dispatch level of a callback whose sched context is in this bucket and whose node holds contract rank (0 = most urgent). Smaller levels dispatch first; equal levels keep registration order.

The three buckets are three RESERVED ranks around the contract’s: a Critical callback is level 0 and a BestEffort one level DISPATCH_LEVELS - 1 whatever their rank, and a Normal one (the default) is 1 + rank, clamped to MAX_CONTRACT_RANK. So the C and C++ Priority API orders exactly as before, and an image whose nodes hold one rank dispatches in exactly today’s order.

pub const fn level_range(self) -> (u8, u8)

The dispatch levels this bucket spans, lo..hi.

pub const fn from_index(index: usize) -> Self

The bucket at index (Self::index’s inverse); Normal past the end.

Trait Implementations

impl Clone for Priority

fn clone(&self) -> Priority

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Priority

impl Debug for Priority

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

Formats the value using the given formatter.

impl Default for Priority

fn default() -> Priority

Returns the “default value” for a type.

impl Eq for Priority

impl Ord for Priority

fn cmp(&self, other: &Priority) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Priority

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for Priority

fn partial_cmp(&self, other: &Priority) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for Priority