Struct lock_api::Mutex

source ·
pub struct Mutex<R: RawMutex, T: ?Sized> { /* private fields */ }
Expand description

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§

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

Consumes this mutex, returning the underlying data.

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.

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.

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.

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.

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.

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.

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.

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§

Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
Converts to this type from the input type.

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
Converts to this type from the input type.

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.