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//! Abstracts out the APIs necessary to `Runtime` for integrating the I/O
//! driver. When the `time` feature flag is **not** enabled. These APIs are
//! shells. This isolates the complexity of dealing with conditional
//! compilation.
/// Re-exported for convenience.
pub(crate) use std::io::Result;
pub(crate) use variant::*;
#[cfg(all(feature = "io-driver", not(loom)))]
mod variant {
use crate::io::driver;
use crate::park::{Either, ParkThread};
use std::io;
/// The driver value the runtime passes to the `timer` layer.
///
/// When the `io-driver` feature is enabled, this is the "real" I/O driver
/// backed by Mio. Without the `io-driver` feature, this is a thread parker
/// backed by a condition variable.
pub(crate) type Driver = Either<driver::Driver, ParkThread>;
/// The handle the runtime stores for future use.
///
/// When the `io-driver` feature is **not** enabled, this is `()`.
pub(crate) type Handle = Option<driver::Handle>;
pub(crate) fn create_driver(enable: bool) -> io::Result<(Driver, Handle)> {
if enable {
let driver = driver::Driver::new()?;
let handle = driver.handle();
Ok((Either::A(driver), Some(handle)))
} else {
let driver = ParkThread::new();
Ok((Either::B(driver), None))
}
}
}
#[cfg(any(not(feature = "io-driver"), loom))]
mod variant {
use crate::park::ParkThread;
use std::io;
/// I/O is not enabled, use a condition variable based parker
pub(crate) type Driver = ParkThread;
/// There is no handle
pub(crate) type Handle = ();
pub(crate) fn create_driver(_enable: bool) -> io::Result<(Driver, Handle)> {
let driver = ParkThread::new();
Ok((driver, ()))
}
}
|
