Module chipset_device::io::deferred

Support for deferred IO, used when an IO can’t be completed synchronously.

Example:

struct Device {
    deferred: Option<DeferredRead>,
}

impl Device {
    fn read_handler(&mut self, data: &mut [u8]) -> IoResult {
        // Defer this request to later.
        let (deferred, token) = defer_read();
        IoResult::Defer(token.into())
    }

    fn poll_device(&mut self, _cx: &mut Context<'_>) {
        // The data is now available, complete the request.
        if let Some(deferred) = self.deferred.take() {
            deferred.complete(&[123]);
        }
    }
}

Structs

• DeferredRead
  A deferred read operation.
• DeferredToken
  Token to return in IoResult::Defer for deferred IOs.
• DeferredWrite
  A deferred write operation.

Functions

• defer_read
  Creates a deferred IO read operation.
• defer_write
  Creates a deferred IO write operation.