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Explicitly opt out of Sync for cell and mpsc types

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These types were already `!Sync`, but this improves error messages when
they are used in contexts that require `Sync`, aligning them with
conventions used with `Rc`, among others.
This commit is contained in:
Andrew Paseltiner 2016-02-29 22:03:23 -05:00
parent 52cb8a9d39
commit f522d88237
6 changed files with 46 additions and 54 deletions
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6
src/libstd/sync/mpsc/mod.rs
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@ -299,6 +299,9 @@ pub struct Receiver<T> {
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T: Send> Send for Receiver<T> { }
#[stable(feature = "rust1", since = "1.0.0")]
impl<T> !Sync for Receiver<T> { }
/// An iterator over messages on a receiver, this iterator will block
/// whenever `next` is called, waiting for a new message, and `None` will be
/// returned when the corresponding channel has hung up.
@ -327,6 +330,9 @@ pub struct Sender<T> {
#[stable(feature = "rust1", since = "1.0.0")]
unsafe impl<T: Send> Send for Sender<T> { }
#[stable(feature = "rust1", since = "1.0.0")]
impl<T> !Sync for Sender<T> { }
/// The sending-half of Rust's synchronous channel type. This half can only be
/// owned by one thread, but it can be cloned to send to other threads.
#[stable(feature = "rust1", since = "1.0.0")]