# Struct core::sync::atomic::AtomicU32 [−] [src]

    pub struct AtomicU32 {
        // some fields omitted
    }

Unstable (`integer_atomics` #32976)

An integer type which can be safely shared between threads.

## Methods

### `impl AtomicU32`
[src]

#### `const fn new(v: u32) -> Self`

Unstable (`integer_atomics` #32976)

Creates a new atomic integer.

# Examples

fn main() { use std::sync::atomic::AtomicIsize; let atomic_forty_two = AtomicIsize::new(42); }

    use std::sync::atomic::AtomicIsize;

    let atomic_forty_two  = AtomicIsize::new(42);

#### `fn load(&self, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Loads a value from the atomic integer.

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

# Panics

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

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let some_isize = AtomicIsize::new(5); assert_eq!(some_isize.load(Ordering::Relaxed), 5); }

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

    let some_isize = AtomicIsize::new(5);

    assert_eq!(some_isize.load(Ordering::Relaxed), 5);

#### `fn store(&self, val: u32, order: Ordering)`

Unstable (`integer_atomics` #32976)

Stores a value into the atomic integer.

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

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let some_isize = AtomicIsize::new(5); some_isize.store(10, Ordering::Relaxed); assert_eq!(some_isize.load(Ordering::Relaxed), 10); }

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

    let some_isize = AtomicIsize::new(5);

    some_isize.store(10, Ordering::Relaxed);
    assert_eq!(some_isize.load(Ordering::Relaxed), 10);

# Panics

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

#### `fn swap(&self, val: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Stores a value into the atomic integer, returning the old value.

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

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let some_isize = AtomicIsize::new(5); assert_eq!(some_isize.swap(10, Ordering::Relaxed), 5); }

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

    let some_isize = AtomicIsize::new(5);

    assert_eq!(some_isize.swap(10, Ordering::Relaxed), 5);

#### `fn compare_and_swap(&self, current: u32, new: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Stores a value into the atomic integer 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

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let some_isize = AtomicIsize::new(5); assert_eq!(some_isize.compare_and_swap(5, 10, Ordering::Relaxed), 5); assert_eq!(some_isize.load(Ordering::Relaxed), 10); assert_eq!(some_isize.compare_and_swap(6, 12, Ordering::Relaxed), 10); assert_eq!(some_isize.load(Ordering::Relaxed), 10); }

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

    let some_isize = AtomicIsize::new(5);

    assert_eq!(some_isize.compare_and_swap(5, 10, Ordering::Relaxed), 5);
    assert_eq!(some_isize.load(Ordering::Relaxed), 10);

    assert_eq!(some_isize.compare_and_swap(6, 12, Ordering::Relaxed), 10);
    assert_eq!(some_isize.load(Ordering::Relaxed), 10);

#### `fn compare_exchange(&self, current: u32, new: u32, success: Ordering, failure: Ordering) -> Result<u32, u32>`

Unstable (`integer_atomics` #32976)

Stores a value into the atomic integer 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 `new`.

`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

#![feature(extended_compare_and_swap)] fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let some_isize = AtomicIsize::new(5); assert_eq!(some_isize.compare_exchange(5, 10, Ordering::Acquire, Ordering::Relaxed), Ok(5)); assert_eq!(some_isize.load(Ordering::Relaxed), 10); assert_eq!(some_isize.compare_exchange(6, 12, Ordering::SeqCst, Ordering::Acquire), Err(10)); assert_eq!(some_isize.load(Ordering::Relaxed), 10); }

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

    let some_isize = AtomicIsize::new(5);

    assert_eq!(some_isize.compare_exchange(5, 10,
                                           Ordering::Acquire,
                                           Ordering::Relaxed),
               Ok(5));
    assert_eq!(some_isize.load(Ordering::Relaxed), 10);

    assert_eq!(some_isize.compare_exchange(6, 12,
                                           Ordering::SeqCst,
                                           Ordering::Acquire),
               Err(10));
    assert_eq!(some_isize.load(Ordering::Relaxed), 10);

#### `fn compare_exchange_weak(&self, current: u32, new: u32, success: Ordering, failure: Ordering) -> Result<u32, u32>`

Unstable (`integer_atomics` #32976)

Stores a value into the atomic integer 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

#![feature(extended_compare_and_swap)] fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let val = AtomicIsize::new(4); let mut old = val.load(Ordering::Relaxed); loop { let new = old * 2; match val.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) { Ok(_) => break, Err(x) => old = x, } } }

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

    let val = AtomicIsize::new(4);

    let mut old = val.load(Ordering::Relaxed);
    loop {
        let new = old * 2;
        match val.compare_exchange_weak(old, new, Ordering::SeqCst, Ordering::Relaxed) {
            Ok(_) => break,
            Err(x) => old = x,
        }
    }

#### `fn fetch_add(&self, val: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Add to the current value, returning the previous value.

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let foo = AtomicIsize::new(0); assert_eq!(foo.fetch_add(10, Ordering::SeqCst), 0); assert_eq!(foo.load(Ordering::SeqCst), 10); }

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

    let foo = AtomicIsize::new(0);
    assert_eq!(foo.fetch_add(10, Ordering::SeqCst), 0);
    assert_eq!(foo.load(Ordering::SeqCst), 10);

#### `fn fetch_sub(&self, val: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Subtract from the current value, returning the previous value.

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let foo = AtomicIsize::new(0); assert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 0); assert_eq!(foo.load(Ordering::SeqCst), -10); }

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

    let foo = AtomicIsize::new(0);
    assert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 0);
    assert_eq!(foo.load(Ordering::SeqCst), -10);

#### `fn fetch_and(&self, val: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Bitwise and with the current value, returning the previous value.

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let foo = AtomicIsize::new(0b101101); assert_eq!(foo.fetch_and(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b100001); }

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

    let foo = AtomicIsize::new(0b101101);
    assert_eq!(foo.fetch_and(0b110011, Ordering::SeqCst), 0b101101);
    assert_eq!(foo.load(Ordering::SeqCst), 0b100001);

#### `fn fetch_or(&self, val: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Bitwise or with the current value, returning the previous value.

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let foo = AtomicIsize::new(0b101101); assert_eq!(foo.fetch_or(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b111111); }

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

    let foo = AtomicIsize::new(0b101101);
    assert_eq!(foo.fetch_or(0b110011, Ordering::SeqCst), 0b101101);
    assert_eq!(foo.load(Ordering::SeqCst), 0b111111);

#### `fn fetch_xor(&self, val: u32, order: Ordering) -> u32`

Unstable (`integer_atomics` #32976)

Bitwise xor with the current value, returning the previous value.

# Examples

fn main() { use std::sync::atomic::{AtomicIsize, Ordering}; let foo = AtomicIsize::new(0b101101); assert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b011110); }

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

    let foo = AtomicIsize::new(0b101101);
    assert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101);
    assert_eq!(foo.load(Ordering::SeqCst), 0b011110);

## Trait Implementations

### `impl Default for AtomicU32`
[src]

#### `fn default() -> Self`

Unstable (`integer_atomics` #32976)

### `impl Debug for AtomicU32`
[src]

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

Unstable (`integer_atomics` #32976)

### `impl Sync for AtomicU32`
[src]

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