63 lines
1.5 KiB
Rust
63 lines
1.5 KiB
Rust
cfg_rt! {
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pub(crate) use crate::runtime::spawn_blocking;
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cfg_fs! {
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#[allow(unused_imports)]
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pub(crate) use crate::runtime::spawn_mandatory_blocking;
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}
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pub(crate) use crate::task::JoinHandle;
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}
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cfg_not_rt! {
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use std::fmt;
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use std::future::Future;
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use std::pin::Pin;
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use std::task::{Context, Poll};
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pub(crate) fn spawn_blocking<F, R>(_f: F) -> JoinHandle<R>
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where
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F: FnOnce() -> R + Send + 'static,
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R: Send + 'static,
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{
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assert_send_sync::<JoinHandle<std::cell::Cell<()>>>();
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panic!("requires the `rt` Tokio feature flag")
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}
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cfg_fs! {
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pub(crate) fn spawn_mandatory_blocking<F, R>(_f: F) -> Option<JoinHandle<R>>
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where
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F: FnOnce() -> R + Send + 'static,
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R: Send + 'static,
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{
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panic!("requires the `rt` Tokio feature flag")
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}
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}
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pub(crate) struct JoinHandle<R> {
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_p: std::marker::PhantomData<R>,
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}
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unsafe impl<T: Send> Send for JoinHandle<T> {}
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unsafe impl<T: Send> Sync for JoinHandle<T> {}
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impl<R> Future for JoinHandle<R> {
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type Output = Result<R, std::io::Error>;
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fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> {
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unreachable!()
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}
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}
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impl<T> fmt::Debug for JoinHandle<T>
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where
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T: fmt::Debug,
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{
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fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt.debug_struct("JoinHandle").finish()
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}
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}
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fn assert_send_sync<T: Send + Sync>() {
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}
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}
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