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sync: tweak watch API (#2814)

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Decouples getting the latest `watch` value from receiving the change
notification. The `Receiver` async method becomes
`Receiver::changed()`. The latest value is obtained from
`Receiver::borrow()`.

The implementation is updated to use `Notify`. This requires adding
`Notify::notify_waiters`. This method is generally useful but is kept
private for now.
This commit is contained in:
Carl Lerche
2020-09-11 15:14:45 -07:00
committed by GitHub
parent c5a9ede157
commit 2bc9a48152
8 changed files with 281 additions and 319 deletions
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tokio/tests/async_send_sync.rs
+2 -4
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@@ -205,7 +205,7 @@ async_assert_fn!(tokio::sync::Mutex<Rc<u8>>::lock(_): !Send & !Sync);
async_assert_fn!(tokio::sync::Mutex<u8>::lock_owned(_): Send & Sync);
async_assert_fn!(tokio::sync::Mutex<Cell<u8>>::lock_owned(_): Send & Sync);
async_assert_fn!(tokio::sync::Mutex<Rc<u8>>::lock_owned(_): !Send & !Sync);
async_assert_fn!(tokio::sync::Notify::notified(_): Send & !Sync);
async_assert_fn!(tokio::sync::Notify::notified(_): Send & Sync);
async_assert_fn!(tokio::sync::RwLock<u8>::read(_): Send & Sync);
async_assert_fn!(tokio::sync::RwLock<u8>::write(_): Send & Sync);
async_assert_fn!(tokio::sync::RwLock<Cell<u8>>::read(_): !Send & !Sync);
@@ -229,9 +229,7 @@ async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver<u8>::recv(_): Send & Sync)
async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver<Cell<u8>>::recv(_): Send & Sync);
async_assert_fn!(tokio::sync::mpsc::UnboundedReceiver<Rc<u8>>::recv(_): !Send & !Sync);
async_assert_fn!(tokio::sync::watch::Receiver<u8>::recv(_): Send & Sync);
async_assert_fn!(tokio::sync::watch::Receiver<Cell<u8>>::recv(_): !Send & !Sync);
async_assert_fn!(tokio::sync::watch::Receiver<Rc<u8>>::recv(_): !Send & !Sync);
async_assert_fn!(tokio::sync::watch::Receiver<u8>::changed(_): Send & Sync);
async_assert_fn!(tokio::sync::watch::Sender<u8>::closed(_): Send & Sync);
async_assert_fn!(tokio::sync::watch::Sender<Cell<u8>>::closed(_): !Send & !Sync);
async_assert_fn!(tokio::sync::watch::Sender<Rc<u8>>::closed(_): !Send & !Sync);