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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.
pub(crate) use self::variant::*;
/// Re-exported for convenience.
pub(crate) use std::io::Result;
#[cfg(feature = "io-driver")]
mod variant {
use crate::net::driver;
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 = driver::Reactor;
/// The handle the runtime stores for future use.
///
/// When the `io-driver` feature is **not** enabled, this is `()`.
pub(crate) type Handle = driver::Handle;
pub(crate) fn create_driver() -> io::Result<(Driver, Handle)> {
let driver = driver::Reactor::new()?;
let handle = driver.handle();
Ok((driver, handle))
}
pub(crate) fn set_default(handle: &Handle) -> driver::DefaultGuard<'_> {
driver::set_default(handle)
}
}
#[cfg(not(feature = "io-driver"))]
mod variant {
use crate::runtime::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() -> io::Result<(Driver, Handle)> {
let driver = ParkThread::new();
Ok((driver, ()))
}
pub(crate) fn set_default(_handle: &Handle) {}
}
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