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|
//! Abstracts out the entire chain of runtime sub-drivers into common types.
use crate::park::{Park, ParkThread};
use std::io;
use std::time::Duration;
// ===== io driver =====
cfg_io_driver! {
type IoDriver = crate::park::Either<crate::io::driver::Driver, crate::park::ParkThread>;
pub(crate) type IoHandle = Option<crate::io::driver::Handle>;
fn create_io_driver(enable: bool) -> io::Result<(IoDriver, IoHandle)> {
use crate::park::Either;
#[cfg(loom)]
assert!(!enable);
if enable {
let driver = crate::io::driver::Driver::new()?;
let handle = driver.handle();
Ok((Either::A(driver), Some(handle)))
} else {
let driver = ParkThread::new();
Ok((Either::B(driver), None))
}
}
}
cfg_not_io_driver! {
type IoDriver = ParkThread;
pub(crate) type IoHandle = ();
fn create_io_driver(_enable: bool) -> io::Result<(IoDriver, IoHandle)> {
let driver = ParkThread::new();
Ok((driver, ()))
}
}
// ===== signal driver =====
macro_rules! cfg_signal_internal_and_unix {
($($item:item)*) => {
#[cfg(unix)]
cfg_signal_internal! { $($item)* }
}
}
cfg_signal_internal_and_unix! {
type SignalDriver = crate::park::Either<crate::signal::unix::driver::Driver, IoDriver>;
pub(crate) type SignalHandle = Option<crate::signal::unix::driver::Handle>;
fn create_signal_driver(io_driver: IoDriver) -> io::Result<(SignalDriver, SignalHandle)> {
use crate::park::Either;
// Enable the signal driver if IO is also enabled
match io_driver {
Either::A(io_driver) => {
let driver = crate::signal::unix::driver::Driver::new(io_driver)?;
let handle = driver.handle();
Ok((Either::A(driver), Some(handle)))
}
Either::B(_) => Ok((Either::B(io_driver), None)),
}
}
}
cfg_not_signal_internal! {
type SignalDriver = IoDriver;
pub(crate) type SignalHandle = ();
fn create_signal_driver(io_driver: IoDriver) -> io::Result<(SignalDriver, SignalHandle)> {
Ok((io_driver, ()))
}
}
// ===== process driver =====
cfg_process_driver! {
type ProcessDriver = crate::park::Either<crate::process::unix::driver::Driver, SignalDriver>;
fn create_process_driver(signal_driver: SignalDriver) -> io::Result<ProcessDriver> {
use crate::park::Either;
// Enable the signal driver if IO is also enabled
match signal_driver {
Either::A(signal_driver) => {
let driver = crate::process::unix::driver::Driver::new(signal_driver)?;
Ok(Either::A(driver))
}
Either::B(_) => Ok(Either::B(signal_driver)),
}
}
}
cfg_not_process_driver! {
type ProcessDriver = SignalDriver;
fn create_process_driver(signal_driver: SignalDriver) -> io::Result<ProcessDriver> {
Ok(signal_driver)
}
}
// ===== time driver =====
cfg_time! {
type TimeDriver = crate::park::Either<crate::time::driver::Driver<ProcessDriver>, ProcessDriver>;
pub(crate) type Clock = crate::time::Clock;
pub(crate) type TimeHandle = Option<crate::time::driver::Handle>;
fn create_clock() -> Clock {
crate::time::Clock::new()
}
fn create_time_driver(
enable: bool,
process_driver: ProcessDriver,
clock: Clock,
) -> (TimeDriver, TimeHandle) {
use crate::park::Either;
if enable {
let driver = crate::time::driver::Driver::new(process_driver, clock);
let handle = driver.handle();
(Either::A(driver), Some(handle))
} else {
(Either::B(process_driver), None)
}
}
}
cfg_not_time! {
type TimeDriver = ProcessDriver;
pub(crate) type Clock = ();
pub(crate) type TimeHandle = ();
fn create_clock() -> Clock {
()
}
fn create_time_driver(
_enable: bool,
process_driver: ProcessDriver,
_clock: Clock,
) -> (TimeDriver, TimeHandle) {
(process_driver, ())
}
}
// ===== runtime driver =====
#[derive(Debug)]
pub(crate) struct Driver {
inner: TimeDriver,
}
pub(crate) struct Resources {
pub(crate) io_handle: IoHandle,
pub(crate) signal_handle: SignalHandle,
pub(crate) time_handle: TimeHandle,
pub(crate) clock: Clock,
}
pub(crate) struct Cfg {
pub(crate) enable_io: bool,
pub(crate) enable_time: bool,
}
impl Driver {
pub(crate) fn new(cfg: Cfg) -> io::Result<(Self, Resources)> {
let clock = create_clock();
let (io_driver, io_handle) = create_io_driver(cfg.enable_io)?;
let (signal_driver, signal_handle) = create_signal_driver(io_driver)?;
let process_driver = create_process_driver(signal_driver)?;
let (time_driver, time_handle) =
create_time_driver(cfg.enable_time, process_driver, clock.clone());
Ok((
Self { inner: time_driver },
Resources {
io_handle,
signal_handle,
time_handle,
clock,
},
))
}
}
impl Park for Driver {
type Unpark = <TimeDriver as Park>::Unpark;
type Error = <TimeDriver as Park>::Error;
fn unpark(&self) -> Self::Unpark {
self.inner.unpark()
}
fn park(&mut self) -> Result<(), Self::Error> {
self.inner.park()
}
fn park_timeout(&mut self, duration: Duration) -> Result<(), Self::Error> {
self.inner.park_timeout(duration)
}
fn shutdown(&mut self) {
self.inner.shutdown()
}
}
|
