# Struct std::sync::atomic::AtomicPtr 1.0.0 [−] [src]

    pub struct AtomicPtr<T> { /* fields omitted */ }

A raw pointer type which can be safely shared between threads.

This type has the same in-memory representation as a `*mut T`.

## Methods

### `impl<T> AtomicPtr<T>`
[src]

#### `fn new(p: *mut T) -> AtomicPtr<T>`

Creates a new `AtomicPtr`.

# Examples

    use std::sync::atomic::AtomicPtr;

    let ptr = &mut 5;
    let atomic_ptr  = AtomicPtr::new(ptr);Run

#### `fn get_mut(&mut self) -> &mut *mut T`
1.15.0

Returns a mutable reference to the underlying pointer.

This is safe because the mutable reference guarantees that no other threads are concurrently accessing the atomic data.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let mut atomic_ptr = AtomicPtr::new(&mut 10);
    *atomic_ptr.get_mut() = &mut 5;
    assert_eq!(unsafe { *atomic_ptr.load(Ordering::SeqCst) }, 5);Run

#### `fn into_inner(self) -> *mut T`
1.15.0

Consumes the atomic and returns the contained value.

This is safe because passing `self` by value guarantees that no other threads are concurrently accessing the atomic data.

# Examples

    use std::sync::atomic::AtomicPtr;

    let atomic_ptr = AtomicPtr::new(&mut 5);
    assert_eq!(unsafe { *atomic_ptr.into_inner() }, 5);Run

#### `fn load(&self, order: Ordering) -> *mut T`

Loads a value from the pointer.

`load` takes an `Ordering` argument which describes the memory ordering of this operation.

# Panics

Panics if `order` is `Release` or `AcqRel`.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let ptr = &mut 5;
    let some_ptr  = AtomicPtr::new(ptr);

    let value = some_ptr.load(Ordering::Relaxed);Run

#### `fn store(&self, ptr: *mut T, order: Ordering)`

Stores a value into the pointer.

`store` takes an `Ordering` argument which describes the memory ordering of this operation.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let ptr = &mut 5;
    let some_ptr  = AtomicPtr::new(ptr);

    let other_ptr = &mut 10;

    some_ptr.store(other_ptr, Ordering::Relaxed);Run

# Panics

Panics if `order` is `Acquire` or `AcqRel`.

#### `fn swap(&self, ptr: *mut T, order: Ordering) -> *mut T`

Stores a value into the pointer, returning the old value.

`swap` takes an `Ordering` argument which describes the memory ordering of this operation.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let ptr = &mut 5;
    let some_ptr  = AtomicPtr::new(ptr);

    let other_ptr = &mut 10;

    let value = some_ptr.swap(other_ptr, Ordering::Relaxed);Run

#### `fn compare_and_swap(&self,
current: *mut T,
new: *mut T,
order: Ordering)
-> *mut T`

Stores a value into the pointer if the current value is the same as the `current` value.

The return value is always the previous value. If it is equal to `current`, then the value was updated.

`compare_and_swap` also takes an `Ordering` argument which describes the memory ordering of this operation.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let ptr = &mut 5;
    let some_ptr  = AtomicPtr::new(ptr);

    let other_ptr   = &mut 10;
    let another_ptr = &mut 10;

    let value = some_ptr.compare_and_swap(other_ptr, another_ptr, Ordering::Relaxed);Run

#### `fn compare_exchange(&self,
current: *mut T,
new: *mut T,
success: Ordering,
failure: Ordering)
-> Result<*mut T, *mut T>`
1.10.0

Stores a value into the pointer if the current value is the same as the `current` value.

The return value is a result indicating whether the new value was written and containing the previous value. On success this value is guaranteed to be equal to `current`.

`compare_exchange` takes two `Ordering` arguments to describe the memory ordering of this operation. The first describes the required ordering if the operation succeeds while the second describes the required ordering when the operation fails. The failure ordering can't be `Release` or `AcqRel` and must be equivalent or weaker than the success ordering.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let ptr = &mut 5;
    let some_ptr  = AtomicPtr::new(ptr);

    let other_ptr   = &mut 10;
    let another_ptr = &mut 10;

    let value = some_ptr.compare_exchange(other_ptr, another_ptr,
                                          Ordering::SeqCst, Ordering::Relaxed);Run

#### `fn compare_exchange_weak(&self,
current: *mut T,
new: *mut T,
success: Ordering,
failure: Ordering)
-> Result<*mut T, *mut T>`
1.10.0

Stores a value into the pointer if the current value is the same as the `current` value.

Unlike `compare_exchange`, this function is allowed to spuriously fail even when the comparison succeeds, which can result in more efficient code on some platforms. The return value is a result indicating whether the new value was written and containing the previous value.

`compare_exchange_weak` takes two `Ordering` arguments to describe the memory ordering of this operation. The first describes the required ordering if the operation succeeds while the second describes the required ordering when the operation fails. The failure ordering can't be `Release` or `AcqRel` and must be equivalent or weaker than the success ordering.

# Examples

    use std::sync::atomic::{AtomicPtr, Ordering};

    let some_ptr = AtomicPtr::new(&mut 5);

    let new = &mut 10;
    let mut old = some_ptr.load(Ordering::Relaxed);
    loop {
        match some_ptr.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) {
            Ok(_) => break,
            Err(x) => old = x,
        }
    }Run

## Trait Implementations

### `impl<T> Debug for AtomicPtr<T>`
1.3.0
[src]

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

Formats the value using the given formatter.

### `impl<T> Sync for AtomicPtr<T>`
[src]

### `impl<T> Send for AtomicPtr<T>`
[src]

### `impl<T> Default for AtomicPtr<T>`
[src]

#### `fn default() -> AtomicPtr<T>`

Creates a null `AtomicPtr<T>`.

### `impl<T> RefUnwindSafe for AtomicPtr<T>`
1.14.0
[src]

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