# Struct lock_api::Mutex [−] [src]

    pub struct Mutex<R, T: ?Sized> { /* fields omitted */ }

A mutual exclusion primitive useful for protecting shared data

This mutex will block threads waiting for the lock to become available. The mutex can also be statically initialized or created via a `new` constructor. Each mutex has a type parameter which represents the data that it is protecting. The data can only be accessed through the RAII guards returned from `lock` and `try_lock`, which guarantees that the data is only ever accessed when the mutex is locked.

## Implementations

### `impl<R: RawMutex, T> Mutex<R, T>` [src]

#### `pub fn new(val: T) -> Mutex<R, T>` [src]

Creates a new mutex in an unlocked state ready for use.

#### `pub fn into_inner(self) -> T` [src]

Consumes this mutex, returning the underlying data.

### `impl<R, T> Mutex<R, T>` [src]

#### `pub const fn const_new(raw_mutex: R, val: T) -> Mutex<R, T>` [src]

Creates a new mutex based on a pre-existing raw mutex.

This allows creating a mutex in a constant context on stable Rust.

### `impl<R: RawMutex, T: ?Sized> Mutex<R, T>` [src]

#### `pub fn lock(&self) -> MutexGuard<'_, R, T>` [src]

Acquires a mutex, blocking the current thread until it is able to do so.

This function will block the local thread until it is available to acquire the mutex. Upon returning, the thread is the only thread with the mutex held. An RAII guard is returned to allow scoped unlock of the lock. When the guard goes out of scope, the mutex will be unlocked.

Attempts to lock a mutex in the thread which already holds the lock will result in a deadlock.

#### `pub fn try_lock(&self) -> Option<MutexGuard<'_, R, T>>` [src]

Attempts to acquire this lock.

If the lock could not be acquired at this time, then `None` is returned. Otherwise, an RAII guard is returned. The lock will be unlocked when the guard is dropped.

This function does not block.

#### `pub fn get_mut(&mut self) -> &mut T` [src]

Returns a mutable reference to the underlying data.

Since this call borrows the `Mutex` mutably, no actual locking needs to take place—the mutable borrow statically guarantees no locks exist.

#### `pub fn is_locked(&self) -> bool` [src]

Checks whether the mutex is currently locked.

#### `pub unsafe fn force_unlock(&self)` [src]

Forcibly unlocks the mutex.

This is useful when combined with `mem::forget` to hold a lock without the need to maintain a `MutexGuard` object alive, for example when dealing with FFI.

# Safety

This method must only be called if the current thread logically owns a `MutexGuard` but that guard has be discarded using `mem::forget`. Behavior is undefined if a mutex is unlocked when not locked.

#### `pub unsafe fn raw(&self) -> &R` [src]

Returns the underlying raw mutex object.

Note that you will most likely need to import the `RawMutex` trait from `lock_api` to be able to call functions on the raw mutex.

# Safety

This method is unsafe because it allows unlocking a mutex while still holding a reference to a `MutexGuard`.

#### `pub fn data_ptr(&self) -> *mut T` [src]

Returns a raw pointer to the underlying data.

This is useful when combined with `mem::forget` to hold a lock without the need to maintain a `MutexGuard` object alive, for example when dealing with FFI.

# Safety

You must ensure that there are no data races when dereferencing the returned pointer, for example if the current thread logically owns a `MutexGuard` but that guard has been discarded using `mem::forget`.

### `impl<R: RawMutexFair, T: ?Sized> Mutex<R, T>` [src]

#### `pub unsafe fn force_unlock_fair(&self)` [src]

Forcibly unlocks the mutex using a fair unlock procotol.

This is useful when combined with `mem::forget` to hold a lock without the need to maintain a `MutexGuard` object alive, for example when dealing with FFI.

# Safety

This method must only be called if the current thread logically owns a `MutexGuard` but that guard has be discarded using `mem::forget`. Behavior is undefined if a mutex is unlocked when not locked.

### `impl<R: RawMutexTimed, T: ?Sized> Mutex<R, T>` [src]

#### `pub fn try_lock_for(&self, timeout: R::Duration) -> Option<MutexGuard<'_, R, T>>` [src]

Attempts to acquire this lock until a timeout is reached.

If the lock could not be acquired before the timeout expired, then `None` is returned. Otherwise, an RAII guard is returned. The lock will be unlocked when the guard is dropped.

#### `pub fn try_lock_until(
&self,
timeout: R::Instant
) -> Option<MutexGuard<'_, R, T>>` [src]

Attempts to acquire this lock until a timeout is reached.

If the lock could not be acquired before the timeout expired, then `None` is returned. Otherwise, an RAII guard is returned. The lock will be unlocked when the guard is dropped.

## Trait Implementations

### `impl<R: RawMutex, T: ?Sized + Debug> Debug for Mutex<R, T>` [src]

#### `fn fmt(&self, f: &mut Formatter<'_>) -> Result` [src]

Formats the value using the given formatter. Read more

### `impl<R: RawMutex, T: ?Sized + Default> Default for Mutex<R, T>` [src]

#### `fn default() -> Mutex<R, T>` [src]

Returns the “default value” for a type. Read more

### `impl<R: RawMutex, T> From<T> for Mutex<R, T>` [src]

#### `fn from(t: T) -> Mutex<R, T>` [src]

Performs the conversion.

### `impl<R: RawMutex + Send, T: ?Sized + Send> Send for Mutex<R, T>` [src]

### `impl<R: RawMutex + Sync, T: ?Sized + Send> Sync for Mutex<R, T>` [src]

## Auto Trait Implementations

### `impl<R, T: ?Sized> Unpin for Mutex<R, T> where
R: Unpin,
T: Unpin,`

## Blanket Implementations

### `impl<T> Any for T where
T: 'static + ?Sized,` [src]

#### `pub fn type_id(&self) -> TypeId` [src]

Gets the `TypeId` of `self`. Read more

### `impl<T> Borrow<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow(&self) -> &T` [src]

Immutably borrows from an owned value. Read more

### `impl<T> BorrowMut<T> for T where
T: ?Sized,` [src]

#### `pub fn borrow_mut(&mut self) -> &mut T` [src]

Mutably borrows from an owned value. Read more

### `impl<T> From<!> for T` [src]

#### `pub fn from(t: !) -> T` [src]

Performs the conversion.

### `impl<T> From<T> for T` [src]

#### `pub fn from(t: T) -> T` [src]

Performs the conversion.

### `impl<T, U> Into<U> for T where
U: From<T>,` [src]

#### `pub fn into(self) -> U` [src]

Performs the conversion.

### `impl<T, U> TryFrom<U> for T where
U: Into<T>,` [src]

#### `type Error = Infallible`

The type returned in the event of a conversion error.

#### `pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>` [src]

Performs the conversion.

### `impl<T, U> TryInto<U> for T where
U: TryFrom<T>,` [src]

#### `type Error = <U as TryFrom<T>>::Error`

The type returned in the event of a conversion error.

#### `pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>` [src]

Performs the conversion.