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

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

    pub struct AtomicI8 { /* fields omitted */ }

🔬 This is a nightly-only experimental API. (`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, `i8`. For more about the differences between atomic types and non-atomic types, please see the module-level documentation.

Please note that examples are shared between atomic variants of primitive integer types, so it's normal that they are all demonstrating `AtomicIsize`.

## Methods

### `impl AtomicI8`
[src]

#### `pub const fn new(v: i8) -> Self`
[src]

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Creates a new atomic integer.

# Examples

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

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

#### `pub fn get_mut(&mut self) -> &mut i8`
[src]

🔬 This is a nightly-only experimental API. (`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

#### `pub fn into_inner(self) -> i8`
[src]

🔬 This is a nightly-only experimental API. (`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

#### `pub fn load(&self, order: Ordering) -> i8`
[src]

🔬 This is a nightly-only experimental API. (`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

#### `pub fn store(&self, val: i8, order: Ordering)`
[src]

🔬 This is a nightly-only experimental API. (`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`.

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

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Stores a value into the atomic integer, returning the previous 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

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

🔬 This is a nightly-only experimental API. (`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

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

🔬 This is a nightly-only experimental API. (`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

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

🔬 This is a nightly-only experimental API. (`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

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

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Adds to the current value, returning the previous value.

This operation wraps around on overflow.

# 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

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

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Subtracts from the current value, returning the previous value.

This operation wraps around on overflow.

# 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

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

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Bitwise "and" with the current value.

Performs a bitwise "and" operation on the current value and the argument `val`, and sets the new value to the result.

Returns 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

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

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Bitwise "or" with the current value.

Performs a bitwise "or" operation on the current value and the argument `val`, and sets the new value to the result.

Returns 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

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

🔬 This is a nightly-only experimental API. (`integer_atomics` #32976)

Bitwise "xor" with the current value.

Performs a bitwise "xor" operation on the current value and the argument `val`, and sets the new value to the result.

Returns 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 Default for AtomicI8`
[src]

#### `fn default() -> Self`
[src]

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

### `impl From<i8> for AtomicI8`
1.23.0
[src]

#### `fn from(v: i8) -> Self`
[src]

Performs the conversion.

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

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

Formats the value using the given formatter. Read more

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

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