Enum CallbackPriority 

pub enum CallbackPriority {
    Low,
    Medium,
    High,
}

Callback priority band — C priorityLow/priorityMedium/priorityHigh (callback.h:41-43).

Variants

Low

priorityLow (0).

Medium

priorityMedium (1).

High

priorityHigh (2).

Implementations

impl CallbackPriority

pub const ALL: [CallbackPriority; 3]

All bands in index order — mirrors the for (i = 0; i < NUM_CALLBACK_PRIORITIES; i++) loops in callback.c.

pub fn index(self) -> usize

The 0..3 band index — C priorityValue (callback.c:98).

pub fn from_record_prio(prio: i16) -> CallbackPriority

The band a record’s PRIO field selects — C callbackSetPriority (callback.h:91-92), which copies the record’s menuPriority index (menuPriority.dbd.pod:24-28 — LOW/MEDIUM/HIGH = 0/1/2, the same three values as priorityLow/priorityMedium/priorityHigh, callback.h:41-43) straight into CALLBACK.priority.

C validates the copied value only when the callback is queued: callbackRequest drops it with “Bad priority” (callback.c:355-357) when it is outside 0..NUM_CALLBACK_PRIORITIES. Dropping a record’s deferred work loses that cycle outright, so an out-of-range PRIO lands on Low here instead — the band a record whose PRIO was never written already has.

pub fn name_prefix(self) -> &'static str

Worker-thread name prefix — C threadNamePrefix (callback.c:86-88).

pub fn os_priority(self) -> ThreadPriority

OS thread priority for this band — C threadPriority (callback.c:93-97): epicsThreadPriorityScanLow - 1, epicsThreadPriorityScanLow + 4, epicsThreadPriorityScanHigh + 1. Values are derived from ThreadPriority so the parity link to epicsThread.h stays in one place.

Trait Implementations

impl Clone for CallbackPriority

fn clone(&self) -> CallbackPriority

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CallbackPriority

impl Debug for CallbackPriority

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

Formats the value using the given formatter.

impl Eq for CallbackPriority

impl Hash for CallbackPriority

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for CallbackPriority

fn cmp(&self, other: &CallbackPriority) -> 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.

fn clamp_to<R>(self, range: R) -> Self

where Self: Sized, R: ClampBounds<Self>,

🔬This is a nightly-only experimental API. (clamp_to)

Restrict a value to a certain range.

impl PartialEq for CallbackPriority

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

Equality operator ==.

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

Inequality operator !=.

impl PartialOrd for CallbackPriority

fn partial_cmp(&self, other: &CallbackPriority) -> 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 CallbackPriority