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use crate::future::{FutureObj, LocalFutureObj};
use core::fmt;
pub trait Spawn {
fn spawn_obj(&mut self, future: FutureObj<'static, ()>)
-> Result<(), SpawnError>;
#[inline]
fn status(&self) -> Result<(), SpawnError> {
Ok(())
}
}
pub trait LocalSpawn {
fn spawn_local_obj(&mut self, future: LocalFutureObj<'static, ()>)
-> Result<(), SpawnError>;
#[inline]
fn status_local(&self) -> Result<(), SpawnError> {
Ok(())
}
}
pub struct SpawnError {
_hidden: (),
}
impl fmt::Debug for SpawnError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("SpawnError")
.field(&"shutdown")
.finish()
}
}
impl fmt::Display for SpawnError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "Executor is shutdown")
}
}
#[cfg(feature = "std")]
impl std::error::Error for SpawnError {}
impl SpawnError {
pub fn shutdown() -> Self {
Self { _hidden: () }
}
pub fn is_shutdown(&self) -> bool {
true
}
}
impl<Sp: ?Sized + Spawn> Spawn for &mut Sp {
fn spawn_obj(&mut self, future: FutureObj<'static, ()>)
-> Result<(), SpawnError> {
Sp::spawn_obj(self, future)
}
fn status(&self) -> Result<(), SpawnError> {
Sp::status(self)
}
}
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for &mut Sp {
fn spawn_local_obj(&mut self, future: LocalFutureObj<'static, ()>)
-> Result<(), SpawnError> {
Sp::spawn_local_obj(self, future)
}
fn status_local(&self) -> Result<(), SpawnError> {
Sp::status_local(self)
}
}
#[cfg(feature = "alloc")]
mod if_alloc {
use alloc::boxed::Box;
use super::*;
impl<Sp: ?Sized + Spawn> Spawn for Box<Sp> {
fn spawn_obj(&mut self, future: FutureObj<'static, ()>)
-> Result<(), SpawnError> {
(**self).spawn_obj(future)
}
fn status(&self) -> Result<(), SpawnError> {
(**self).status()
}
}
impl<Sp: ?Sized + LocalSpawn> LocalSpawn for Box<Sp> {
fn spawn_local_obj(&mut self, future: LocalFutureObj<'static, ()>)
-> Result<(), SpawnError> {
(**self).spawn_local_obj(future)
}
fn status_local(&self) -> Result<(), SpawnError> {
(**self).status_local()
}
}
}