Struct SchedContext 

pub struct SchedContext {
    pub class: SchedClass,
    pub priority: Priority,
    pub period_us: OptUs,
    pub budget_us: OptUs,
    pub deadline_us: OptUs,
    pub deadline_policy: DeadlinePolicy,
    pub os_pri: u8,
    pub deadline_action: DeadlineAction,
    pub tt_window_offset_us: OptUs,
    pub tt_window_duration_us: OptUs,
}

First-class scheduling capability — one SC per scheduling concern, shared by every callback that should run under the same budget / period / deadline / class.

Phase 110.B.a defines the shape; 110.B.b’s builder methods on Executor consume it.

Fields

class: SchedClass

priority: Priority

period_us: OptUs

budget_us: OptUs

deadline_us: OptUs

deadline_policy: DeadlinePolicy

os_pri: u8

Phase 110.F — opt-in OS-level priority for per-callback dispatch. 0 (default) means “no per-callback OS priority” — the executor’s cooperative dispatch path runs every callback bound to this SC. Non-zero values trigger the per-priority worker-pool path (registered via Executor::register_os_priority_dispatcher); each callback then runs on a worker thread the OS scheduler has elevated to that numeric priority.

Numeric meaning is platform-defined (POSIX 1..99 for SCHED_FIFO; FreeRTOS 0..configMAX_PRIORITIES-1; Zephyr direction-flipped). Chain-priority assignment + chain grouping happen at the orchestration layer and are out of executor scope.

deadline_action: DeadlineAction

Phase 110.G — time-triggered window offset within the executor’s major frame. None (sentinel 0) = always eligible (no TT gate); Some(off) + tt_window_duration_us gates dispatch to the half-open interval [off, off + duration) mod major_frame.

Independent of class — a Sporadic-class SC can also be TT- gated; both gates apply (skip dispatch when EITHER fails). Pairs with Executor::register_time_triggered_dispatcher which sets the major-frame length. W3b.5 — reaction on a deadline miss (see DeadlineAction).

tt_window_offset_us: OptUs

tt_window_duration_us: OptUs

Phase 110.G — time-triggered window length. See tt_window_offset_us.

Implementations

impl SchedContext

pub const fn new_fifo() -> SchedContext

pub fn from_tier_policy( class: Option<&str>, period_us: Option<u64>, budget_us: Option<u64>, deadline_us: Option<u64>, deadline_policy: Option<&str>, ) -> Option<(SchedContext, Option<u32>)>

RFC-0052 — the common backend that lowers an RTOS-agnostic tier policy ([tiers.<t>] class / budget / period / deadline) to a SchedContext. ONE implementation shared by every language: the Rust runtime ([crate::node_runtime::ExecutorNodeRuntime::apply_tier_sched_policy]) and the C / C++ entries (nros_{c,cpp}_create_sched_context_from_policy) all call this, so the mapping can never drift between codegen paths.

• real_time + budget_us + period_us → SchedClass::Sporadic (budget + RT replenishment period on the SC);
• best_effort → SchedClass::BestEffort;
• time_triggered + period_us → a TT window (major frame = period_us, window = budget_us or the whole frame). The returned Some(frame_us) is the major frame the caller must install via crate::executor::Executor::register_time_triggered_dispatcher (the SC itself stays Fifo-class per the 110.G TT refactor);
• deadline_us sets the SC deadline; deadline_policy its DeadlineAction.

Returns None when the tier declares no class / budget / deadline — the caller keeps the default Fifo SC (byte-identical pre-policy behavior). os_pri is intentionally NOT set here (it is an orthogonal per-callback OS-priority knob the caller applies); this fn covers only the RTOS-agnostic real-time policy.

Trait Implementations

impl Clone for SchedContext

fn clone(&self) -> SchedContext

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SchedContext

impl Debug for SchedContext

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

Formats the value using the given formatter.

impl Default for SchedContext

fn default() -> SchedContext

Returns the “default value” for a type.