# Struct ethcore_util::standard::RwLockWriteGuard [−]

    #[must_use]
    pub struct RwLockWriteGuard<'a, T> where T: 'a + ?Sized { /* fields omitted */ }

RAII structure used to release the exclusive write access of a lock when dropped.

## Methods

### `impl<'a, T> RwLockWriteGuard<'a, T> where T: 'a + ?Sized`

#### `fn downgrade(self) -> RwLockReadGuard<'a, T>`

Atomically downgrades a write lock into a read lock without allowing any writers to take exclusive access of the lock in the meantime.

Note that if there are any writers currently waiting to take the lock then other readers may not be able to acquire the lock even if it was downgraded.

#### `fn unlock_fair(self)`

Unlocks the `RwLock` using a fair unlock protocol.

By default, `RwLock` is unfair and allow the current thread to re-lock the rwlock before another has the chance to acquire the lock, even if that thread has been blocked on the `RwLock` for a long time. This is the default because it allows much higher throughput as it avoids forcing a context switch on every rwlock unlock. This can result in one thread acquiring a `RwLock` many more times than other threads.

However in some cases it can be beneficial to ensure fairness by forcing the lock to pass on to a waiting thread if there is one. This is done by using this method instead of dropping the `RwLockWriteGuard` normally.

## Trait Implementations

### `impl<'a, T> Deref for RwLockWriteGuard<'a, T> where T: 'a + ?Sized`

#### `type Target = T`

The resulting type after dereferencing

#### `fn deref(&self) -> &T`

The method called to dereference a value

### `impl<'a, T> Drop for RwLockWriteGuard<'a, T> where T: 'a + ?Sized`

#### `fn drop(&mut self)`

A method called when the value goes out of scope. Read more

### `impl<'a, T> StableAddress for RwLockWriteGuard<'a, T> where T: ?Sized`

### `impl<'a, T> DerefMut for RwLockWriteGuard<'a, T> where T: 'a + ?Sized`

#### `fn deref_mut(&mut self) -> &mut T`

The method called to mutably dereference a value

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