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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:22:09 +0000 |
commit | 43a97878ce14b72f0981164f87f2e35e14151312 (patch) | |
tree | 620249daf56c0258faa40cbdcf9cfba06de2a846 /third_party/rust/tokio/src/blocking.rs | |
parent | Initial commit. (diff) | |
download | firefox-upstream.tar.xz firefox-upstream.zip |
Adding upstream version 110.0.1.upstream/110.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/tokio/src/blocking.rs')
-rw-r--r-- | third_party/rust/tokio/src/blocking.rs | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/third_party/rust/tokio/src/blocking.rs b/third_party/rust/tokio/src/blocking.rs new file mode 100644 index 0000000000..f172399d5e --- /dev/null +++ b/third_party/rust/tokio/src/blocking.rs @@ -0,0 +1,63 @@ +cfg_rt! { + pub(crate) use crate::runtime::spawn_blocking; + + cfg_fs! { + #[allow(unused_imports)] + pub(crate) use crate::runtime::spawn_mandatory_blocking; + } + + pub(crate) use crate::task::JoinHandle; +} + +cfg_not_rt! { + use std::fmt; + use std::future::Future; + use std::pin::Pin; + use std::task::{Context, Poll}; + + pub(crate) fn spawn_blocking<F, R>(_f: F) -> JoinHandle<R> + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + assert_send_sync::<JoinHandle<std::cell::Cell<()>>>(); + panic!("requires the `rt` Tokio feature flag") + } + + cfg_fs! { + pub(crate) fn spawn_mandatory_blocking<F, R>(_f: F) -> Option<JoinHandle<R>> + where + F: FnOnce() -> R + Send + 'static, + R: Send + 'static, + { + panic!("requires the `rt` Tokio feature flag") + } + } + + pub(crate) struct JoinHandle<R> { + _p: std::marker::PhantomData<R>, + } + + unsafe impl<T: Send> Send for JoinHandle<T> {} + unsafe impl<T: Send> Sync for JoinHandle<T> {} + + impl<R> Future for JoinHandle<R> { + type Output = Result<R, std::io::Error>; + + fn poll(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<Self::Output> { + unreachable!() + } + } + + impl<T> fmt::Debug for JoinHandle<T> + where + T: fmt::Debug, + { + fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result { + fmt.debug_struct("JoinHandle").finish() + } + } + + fn assert_send_sync<T: Send + Sync>() { + } +} |