Struct compio_driver::Proactor

pub struct Proactor { /* private fields */ }

Low-level actions of completion-based IO. It owns the operations to keep the driver safe.

Implementations

impl Proactor

pub fn new() -> Result<Self>

Create Proactor with 1024 entries.

pub fn with_entries(entries: u32) -> Result<Self>

Create Proactor with specified entries.

pub fn attach(&mut self, fd: RawFd) -> Result<()>

Attach an fd to the driver. It will cause unexpected result to attach the handle with one driver and push an op to another driver.

Platform specific

• IOCP: it will be attached to the completion port. An fd could only be attached to one driver, and could only be attached once, even if you try_clone it.
• io-uring: it will do nothing and return Ok(()).
• polling: it will initialize inner queue and register to the driver. On Linux and Android, if the fd is a normal file or a directory, this method will do nothing.

pub fn cancel(&mut self, user_data: usize)

Cancel an operation with the pushed user-defined data.

The cancellation is not reliable. The underlying operation may continue, but just don’t return from Proactor::poll. Therefore, although an operation is cancelled, you should not reuse its user_data.

It is well-defined to cancel before polling. If the submitted operation contains a cancelled user-defined data, the operation will be ignored.

pub fn push<T: OpCode + 'static>( &mut self, op: T ) -> PushEntry<usize, BufResult<usize, T>>

Push an operation into the driver, and return the unique key, called user-defined data, associated with it.

pub fn poll( &mut self, timeout: Option<Duration>, entries: &mut impl Extend<Entry> ) -> Result<()>

Poll the driver and get completed entries. You need to call Proactor::pop to get the pushed operations.

pub fn pop<'a>( &'a mut self, entries: &'a mut impl Iterator<Item = Entry> ) -> impl Iterator<Item = BufResult<usize, Operation>> + 'a

Get the pushed operations from the completion entries.

Trait Implementations

impl AsRawFd for Proactor

fn as_raw_fd(&self) -> RawFd

Extracts the raw file descriptor.