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|
//! Abstracts out the entire chain of runtime sub-drivers into common types.
use crate::park::thread::ParkThread;
use crate::park::Park;
use std::io;
use std::time::Duration;
// ===== io driver =====
cfg_io_driver! {
type IoDriver = crate::io::driver::Driver;
type IoStack = crate::park::either::Either<ProcessDriver, ParkThread>;
pub(crate) type IoHandle = Option<crate::io::driver::Handle>;
fn create_io_stack(enabled: bool) -> io::Result<(IoStack, IoHandle, SignalHandle)> {
use crate::park::either::Either;
#[cfg(loom)]
assert!(!enabled);
let ret = if enabled {
let io_driver = crate::io::driver::Driver::new()?;
let io_handle = io_driver.handle();
let (signal_driver, signal_handle) = create_signal_driver(io_driver)?;
let process_driver = create_process_driver(signal_driver);
(Either::A(process_driver), Some(io_handle), signal_handle)
} else {
(Either::B(ParkThread::new()), Default::default(), Default::default())
};
Ok(ret)
}
}
cfg_not_io_driver! {
pub(crate) type IoHandle = ();
type IoStack = ParkThread;
fn create_io_stack(_enabled: bool) -> io::Result<(IoStack, IoHandle, SignalHandle)> {
Ok((ParkThread::new(), Default::default(), Default::default()))
}
}
// ===== 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::signal::unix::driver::Driver;
pub(crate) type SignalHandle = Option<crate::signal::unix::driver::Handle>;
fn create_signal_driver(io_driver: IoDriver) -> io::Result<(SignalDriver, SignalHandle)> {
let driver = crate::signal::unix::driver::Driver::new(io_driver)?;
let handle = driver.handle();
Ok((driver, Some(handle)))
}
}
cfg_not_signal_internal! {
pub(crate) type SignalHandle = ();
cfg_io_driver! {
type SignalDriver = IoDriver;
fn create_signal_driver(io_driver: IoDriver) -> io::Result<(SignalDriver, SignalHandle)> {
Ok((io_driver, ()))
}
}
}
// ===== process driver =====
cfg_process_driver! {
type ProcessDriver = crate::process::unix::driver::Driver;
fn create_process_driver(signal_driver: SignalDriver) -> ProcessDriver {
crate::process::unix::driver::Driver::new(signal_driver)
}
}
cfg_not_process_driver! {
cfg_io_driver! {
type ProcessDriver = SignalDriver;
fn create_process_driver(signal_driver: SignalDriver) -> ProcessDriver {
signal_driver
}
}
}
// ===== time driver =====
cfg_time! {
type TimeDriver = crate::park::either::Either<crate::time::driver::Driver<IoStack>, IoStack>;
pub(crate) type Clock = crate::time::Clock;
pub(crate) type TimeHandle = Option<crate::time::driver::Handle>;
fn create_clock(enable_pausing: bool, start_paused: bool) -> Clock {
crate::time::Clock::new(enable_pausing, start_paused)
}
fn create_time_driver(
enable: bool,
io_stack: IoStack,
clock: Clock,
) -> (TimeDriver, TimeHandle) {
use crate::park::either::Either;
if enable {
let driver = crate::time::driver::Driver::new(io_stack, clock);
let handle = driver.handle();
(Either::A(driver), Some(handle))
} else {
(Either::B(io_stack), None)
}
}
}
cfg_not_time! {
type TimeDriver = IoStack;
pub(crate) type Clock = ();
pub(crate) type TimeHandle = ();
fn create_clock(_enable_pausing: bool, _start_paused: bool) -> Clock {
()
}
fn create_time_driver(
_enable: bool,
io_stack: IoStack,
_clock: Clock,
) -> (TimeDriver, TimeHandle) {
(io_stack, ())
}
}
// ===== 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,
pub(crate) enable_pause_time: bool,
pub(crate) start_paused: bool,
}
impl Driver {
pub(crate) fn new(cfg: Cfg) -> io::Result<(Self, Resources)> {
let (io_stack, io_handle, signal_handle) = create_io_stack(cfg.enable_io)?;
let clock = create_clock(cfg.enable_pause_time, cfg.start_paused);
let (time_driver, time_handle) =
create_time_driver(cfg.enable_time, io_stack, 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()
}
}
|
