Struct tokio::sync::OwnedMutexGuard[][src]

pub struct OwnedMutexGuard<T: ?Sized> { /* fields omitted */ }
Expand description

An owned handle to a held Mutex.

This guard is only available from a Mutex that is wrapped in an Arc. It is identical to MutexGuard, except that rather than borrowing the Mutex, it clones the Arc, incrementing the reference count. This means that unlike MutexGuard, it will have the 'static lifetime.

As long as you have this guard, you have exclusive access to the underlying T. The guard internally keeps a reference-counted pointer to the original Mutex, so even if the lock goes away, the guard remains valid.

The lock is automatically released whenever the guard is dropped, at which point lock will succeed yet again.

Implementations

Returns a reference to the original Arc<Mutex>.

use std::sync::Arc;
use tokio::sync::{Mutex, OwnedMutexGuard};

async fn unlock_and_relock(guard: OwnedMutexGuard<u32>) -> OwnedMutexGuard<u32> {
    println!("1. contains: {:?}", *guard);
    let mutex: Arc<Mutex<u32>> = OwnedMutexGuard::mutex(&guard).clone();
    drop(guard);
    let guard = mutex.lock_owned().await;
    println!("2. contains: {:?}", *guard);
    guard
}

Trait Implementations

Formats the value using the given formatter. Read more

The resulting type after dereferencing.

Dereferences the value.

Mutably dereferences the value.

Formats the value using the given formatter. Read more

Executes the destructor for this type. Read more

Auto Trait Implementations

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Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Performs the conversion.

Performs the conversion.

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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.