Struct ProcessSnapshot 

pub struct ProcessSnapshot { /* private fields */ }

Snapshot of changes from a process cycle, used for notify outside lock.

The first post is held inline and the rest spill to a Vec, the same shape as ProcStack and for the same reason: the overwhelmingly common cycle posts exactly one field — the record’s deadband-tracked value, with nothing subscribed behind it — and a Vec charged that cycle a 256-byte allocation and its free. It was the last per-cycle allocation on the process path.

head and rest carry no meaning of their own: head is post 0 and rest is posts 1.., so nothing may read them apart from Self::iter.

Implementations

impl ProcessSnapshot

pub fn new() -> Self

A cycle that posted nothing.

pub fn push(&mut self, post: (Cow<'static, str>, EpicsValue, EventMask))

Add one post, after every post already added.

pub fn is_empty(&self) -> bool

Whether this cycle posted nothing at all.

pub fn len(&self) -> usize

How many fields this cycle posts.

pub fn iter( &self, ) -> impl Iterator<Item = &(Cow<'static, str>, EpicsValue, EventMask)>

The cycle’s posts, in the order they were added.

pub fn retain( &mut self, keep: impl FnMut(&(Cow<'static, str>, EpicsValue, EventMask)) -> bool, )

Keep only the posts keep accepts; keep sees every post once, in the order they were added.

pub fn published_mask(&self) -> EventMask

The union of every DBE_* class this cycle actually published — the port’s answer to “what did db_post_events send for this record”.

A field carrying an empty mask is not posted at all (RecordInstance::notify_from_snapshot skips it), so an empty union means the cycle published nothing and no monitor of any class fired.

Trait Implementations

impl Default for ProcessSnapshot

fn default() -> Self

Returns the “default value” for a type.

impl Extend<(Cow<'static, str>, EpicsValue, EventMask)> for ProcessSnapshot

fn extend<I: IntoIterator<Item = (Cow<'static, str>, EpicsValue, EventMask)>>( &mut self, iter: I, )

Extends a collection with the contents of an iterator.

fn extend_one(&mut self, item: T)

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

Extends a collection with exactly one element.

fn extend_reserve(&mut self, additional: usize)

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

Reserves capacity in a collection for the given number of additional elements.

impl FromIterator<(Cow<'static, str>, EpicsValue, EventMask)> for ProcessSnapshot

fn from_iter<I: IntoIterator<Item = (Cow<'static, str>, EpicsValue, EventMask)>>( iter: I, ) -> Self

Creates a value from an iterator.