Struct Context 

pub struct Context { /* private fields */ }

Available on Windows only.

Context handle provided to APC tasks.

Implementations

impl Context

pub async fn cancel_guard<T, F>(&mut self, f: F) -> Result<T, Canceled>

where F: AsyncFnOnce(&mut Context) -> T,

Runs f and awaits its future, converting a cancellation request for this task into Err(Canceled), with f’s future dropped instead of the task future. The surrounding task can run async cleanup before finishing.

Only one cancel_guard may be active for a task at a time — calling this re-entrantly panics.

pub fn submit<T, F>(&self, f: F) -> Task<T>

where T: Send + 'static, F: AsyncFnOnce(&mut Context) -> T + Send + 'static,

Submits f to the reactor thread as a new task and returns a future for its result.

Because APCs are queued in a FIFO manner, self-submitting and awaiting a task can be used to guarantee that all previously pending APCs, including those generated by Win32 APIs, have run.