Struct ServiceWaker 

pub struct ServiceWaker(/* private fields */);

Wakes whichever thread services requests, so it does not have to poll for them.

The server cannot know how to wake its embedder, and the embedder’s event loop does not exist yet when the server starts, so the callback is installed later. A OnceLock rather than a lock because it is written exactly once and read on the path of every request.

Without one installed the embedder must poll, which is what the Blitz shell used to do on a 10ms timer: 100 wakeups a second while idle, up to 10ms of latency on every command, and enough of both to show up in any measurement taken with the driver attached.

Implementations

impl ServiceWaker

pub fn set(&self, wake: impl Fn() + Send + Sync + 'static)

Install the wake callback. Later calls are ignored.

Trait Implementations

impl Clone for ServiceWaker

fn clone(&self) -> ServiceWaker

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ServiceWaker

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

Formats the value using the given formatter.

impl Default for ServiceWaker

fn default() -> ServiceWaker

Returns the “default value” for a type.