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mutex: add OwnedMutexGuard for Arc<Mutex<T>>s (#2455)

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This PR adds a new `OwnedMutexGuard` type and `lock_owned` and
`try_lock_owned` methods for `Arc<Mutex<T>>`.  This is pretty much the
same as the similar APIs added in #2421. 

I've also corrected some existing documentation that incorrectly
implied that the existing `lock` method cloned an internal `Arc` — I
think this may be a holdover from `tokio` 0.1's `Lock` type?

Signed-off-by: Eliza Weisman <[email protected]>
This commit is contained in:
Eliza Weisman
2020-04-29 15:48:08 -07:00
committed by GitHub
parent c52b78b792
commit 45773c5641
4 changed files with 285 additions and 29 deletions
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tokio/tests/async_send_sync.rs
+3
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@@ -203,6 +203,9 @@ async_assert_fn!(tokio::sync::Barrier::wait(_): Send & Sync);
async_assert_fn!(tokio::sync::Mutex<u8>::lock(_): Send & Sync);
async_assert_fn!(tokio::sync::Mutex<Cell<u8>>::lock(_): Send & Sync);
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::RwLock<u8>::read(_): Send & Sync);
async_assert_fn!(tokio::sync::RwLock<u8>::write(_): Send & Sync);