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task: remove mutex in JoinError (tokio-rs#3959)
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,26 @@ | ||
//! This module contains a type that can make `Send + !Sync` types `Sync` by | ||
//! disallowing all immutable access to the value. | ||
//! | ||
//! A similar primitive is provided in the `sync_wrapper` crate. | ||
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pub(crate) struct SyncWrapper<T> { | ||
value: T, | ||
} | ||
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// safety: The SyncWrapper being send allows you to send the inner value across | ||
// thread boundaries. | ||
unsafe impl<T: Send> Send for SyncWrapper<T> {} | ||
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// safety: An immutable reference to a SyncWrapper is useless, so moving such an | ||
// immutable reference across threads is safe. | ||
unsafe impl<T> Sync for SyncWrapper<T> {} | ||
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impl<T> SyncWrapper<T> { | ||
pub(crate) fn new(value: T) -> Self { | ||
Self { value } | ||
} | ||
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pub(crate) fn into_inner(self) -> T { | ||
self.value | ||
} | ||
} |
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