std::sync::atomic::AtomicI8 - Rust
Description: API documentation for the Rust `AtomicI8` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, AtomicI8

# Struct std::sync::atomic::AtomicI8 [−] [src]

    pub struct AtomicI8 { /* fields omitted */ }

Unstable (`integer_atomics` #32976)

An integer type which can be safely shared between threads.

This type has the same in-memory representation as the underlying integer type.

## Methods

### `impl AtomicI8`
[src]

#### `fn new(v: i8) -> AtomicI8`

Unstable (`integer_atomics` #32976)

Creates a new atomic integer.

# Examples

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

    let atomic_forty_two  = AtomicIsize::new(42);Run

#### `fn get_mut(&mut self) -> &mut i8`

Unstable (`integer_atomics` #32976)

Returns a mutable reference to the underlying integer.

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

# Examples

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

    let mut some_isize = AtomicIsize::new(10);
    assert_eq!(*some_isize.get_mut(), 10);
    *some_isize.get_mut() = 5;
    assert_eq!(some_isize.load(Ordering::SeqCst), 5);Run

#### `fn into_inner(self) -> i8`

Unstable (`integer_atomics` #32976)

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::AtomicIsize;

    let some_isize = AtomicIsize::new(5);
    assert_eq!(some_isize.into_inner(), 5);Run

#### `fn load(&self, order: Ordering) -> i8`

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

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

    let some_isize = AtomicIsize::new(5);

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

#### `fn store(&self, val: i8, 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

    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);Run

# Panics

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

#### `fn swap(&self, val: i8, order: Ordering) -> i8`

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

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

    let some_isize = AtomicIsize::new(5);

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

#### `fn compare_and_swap(&self, current: i8, new: i8, order: Ordering) -> i8`

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

    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);Run

#### `fn compare_exchange(&self,
current: i8,
new: i8,
success: Ordering,
failure: Ordering)
-> Result<i8, i8>`

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 `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::{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);Run

#### `fn compare_exchange_weak(&self,
current: i8,
new: i8,
success: Ordering,
failure: Ordering)
-> Result<i8, i8>`

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

    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,
        }
    }Run

#### `fn fetch_add(&self, val: i8, order: Ordering) -> i8`

Unstable (`integer_atomics` #32976)

Add to the current value, returning the previous value.

# Examples

    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);Run

#### `fn fetch_sub(&self, val: i8, order: Ordering) -> i8`

Unstable (`integer_atomics` #32976)

Subtract from the current value, returning the previous value.

# Examples

    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);Run

#### `fn fetch_and(&self, val: i8, order: Ordering) -> i8`

Unstable (`integer_atomics` #32976)

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

# Examples

    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);Run

#### `fn fetch_or(&self, val: i8, order: Ordering) -> i8`

Unstable (`integer_atomics` #32976)

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

# Examples

    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);Run

#### `fn fetch_xor(&self, val: i8, order: Ordering) -> i8`

Unstable (`integer_atomics` #32976)

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

# Examples

    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);Run

## Trait Implementations

### `impl Sync for AtomicI8`
[src]

### `impl Debug for AtomicI8`
[src]

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

Formats the value using the given formatter.

### `impl Default for AtomicI8`
[src]

#### `fn default() -> AtomicI8`

Returns the "default value" for a type. Read more

### `impl RefUnwindSafe for AtomicI8`
[src]

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