结构体 MutexGuard 

pub struct MutexGuard<'a, T>
where
    T: 'a + ?Sized,
{ /* private fields */ }

An RAII implementation of 一个 “scoped lock” of 一个 mutex. When this structure is dropped (falls out of scope), the lock ， unlocked.

此 data protected by the mutex can be accessed through this guard via its Deref 并 DerefMut implementations.

This structure is created by the lock 并 try_lock methods on Mutex。

实现

impl<'a, T> MutexGuard<'a, T>

where T: ?Sized,

pub fn map<U, F>(orig: MutexGuard<'a, T>, f: F) -> MappedMutexGuard<'a, U>

where F: FnOnce(&mut T) -> &mut U, U: ?Sized,

🔬This is a nightly-only experimental API. (mapped_lock_guards)

Makes 一个 MappedMutexGuard 用于 一个 component of the borrowed data, e.g. an enum variant.

此 Mutex is already locked, so this cannot fail.

This 是 associated function that needs 到 be 用 as MutexGuard::map(。。。)。 A method would interfere with methods of the same name on the contents of the MutexGuard 用 through Deref。

pub fn filter_map<U, F>( orig: MutexGuard<'a, T>, f: F, ) -> Result<MappedMutexGuard<'a, U>, MutexGuard<'a, T>>

where F: FnOnce(&mut T) -> Option<&mut U>, U: ?Sized,

🔬This is a nightly-only experimental API. (mapped_lock_guards)

Makes 一个 MappedMutexGuard 用于 一个 component of the borrowed data. 此 original guard is returned as an Err(。。。) if the closure returns None。

此 Mutex is already locked, so this cannot fail.

This 是 associated function that needs 到 be 用 as MutexGuard::filter_map(。。。)。 A method would interfere with methods of the same name on the contents of the MutexGuard 用 through Deref。

Trait 实现

impl<T> Debug for MutexGuard<'_, T>

where T: Debug + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

使用给定的格式化器格式化此值。 更多信息

impl<T> Deref for MutexGuard<'_, T>

where T: ?Sized,

type Target = T

解引用后得到的类型。

fn deref(&self) -> &T

解引用此值。

impl<T> DerefMut for MutexGuard<'_, T>

where T: ?Sized,

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

以可变方式解引用此值。

impl<T> Display for MutexGuard<'_, T>

where T: Display + ?Sized,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

使用给定的格式化器格式化此值。 更多信息

impl<T> Drop for MutexGuard<'_, T>

where T: ?Sized,

fn drop(&mut self)

执行此类型的析构函数。 更多信息

impl<T> !Send for MutexGuard<'_, T>

where T: ?Sized,

A MutexGuard is not Send 到 maximize platform portability.

On platforms that use POSIX threads (commonly referred 到 as pthreads) there 是 requirement 到 release mutex locks on the same thread they were acquired. For this reason, MutexGuard must not implement Send 到 prevent it being dropped 从 another thread.

impl<T> Sync for MutexGuard<'_, T>

where T: Sync + ?Sized,

T must be Sync 用于 一个 MutexGuard<T> 到 be Sync because it is possible 到 get 一个 &T 从 &MutexGuard (via Deref)。