std::sync::atomic::AtomicI32 - Rust
Description: API documentation for the Rust `AtomicI32` struct in crate `std`.
Keywords: rust, rustlang, rust-lang, AtomicI32

# [−][src]Struct std::sync::atomic::AtomicI32

    pub struct AtomicI32 { /* 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, `i32`. For more about the differences between atomic types and non-atomic types, please see the module-level documentation.

## Methods

###

`impl AtomicI32`

[src]

####

`pub const fn new(v: i32) -> AtomicI32`

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

Creates a new atomic integer.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::AtomicI32;

    let atomic_forty_two = AtomicI32::new(42);Run

####

`pub fn get_mut(&mut self) -> &mut i32`

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🔬 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

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let mut some_var = AtomicI32::new(10);
    assert_eq!(*some_var.get_mut(), 10);
    *some_var.get_mut() = 5;
    assert_eq!(some_var.load(Ordering::SeqCst), 5);Run

####

`pub fn into_inner(self) -> i32`

[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

    #![feature(integer_atomics)]

    use std::sync::atomic::AtomicI32;

    let some_var = AtomicI32::new(5);
    assert_eq!(some_var.into_inner(), 5);Run

####

`pub fn load(&self, order: Ordering) -> i32`

[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. Possible values are `SeqCst`, `Acquire` and `Relaxed`.

# Panics

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

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let some_var = AtomicI32::new(5);

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

####

`pub fn store(&self, val: i32, 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. Possible values are `SeqCst`, `Release` and `Relaxed`.

# Panics

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

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let some_var = AtomicI32::new(5);

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

####

`pub fn swap(&self, val: i32, order: Ordering) -> i32`

[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. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let some_var = AtomicI32::new(5);

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

####

`pub fn compare_and_swap(&self, current: i32, new: i32, order: Ordering) -> i32`

[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. Notice that even when using `AcqRel`, the operation might fail and hence just perform an `Acquire` load, but not have `Release` semantics. Using `Acquire` makes the store part of this operation `Relaxed` if it happens, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let some_var = AtomicI32::new(5);

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

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

####

`pub fn compare_exchange( &self, current: i32, new: i32, success: Ordering, failure: Ordering ) -> Result<i32, i32>`

[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. Using `Acquire` as success ordering makes the store part of this operation `Relaxed`, and using `Release` makes the successful load `Relaxed`. The failure ordering can only be `SeqCst`, `Acquire` or `Relaxed` and must be equivalent to or weaker than the success ordering.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let some_var = AtomicI32::new(5);

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

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

####

`pub fn compare_exchange_weak( &self, current: i32, new: i32, success: Ordering, failure: Ordering ) -> Result<i32, i32>`

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🔬 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. Using `Acquire` as success ordering makes the store part of this operation `Relaxed`, and using `Release` makes the successful load `Relaxed`. The failure ordering can only be `SeqCst`, `Acquire` or `Relaxed` and must be equivalent to or weaker than the success ordering.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let val = AtomicI32::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: i32, order: Ordering) -> i32`

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🔬 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.

`fetch_add` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::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: i32, order: Ordering) -> i32`

[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.

`fetch_sub` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(20);
    assert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 20);
    assert_eq!(foo.load(Ordering::SeqCst), 10);Run

####

`pub fn fetch_and(&self, val: i32, order: Ordering) -> i32`

[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.

`fetch_and` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(0b101101);
    assert_eq!(foo.fetch_and(0b110011, Ordering::SeqCst), 0b101101);
    assert_eq!(foo.load(Ordering::SeqCst), 0b100001);Run

####

`pub fn fetch_nand(&self, val: i32, order: Ordering) -> i32`

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

Bitwise "nand" with the current value.

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

Returns the previous value.

`fetch_nand` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(0x13);
    assert_eq!(foo.fetch_nand(0x31, Ordering::SeqCst), 0x13);
    assert_eq!(foo.load(Ordering::SeqCst), !(0x13 & 0x31));Run

####

`pub fn fetch_or(&self, val: i32, order: Ordering) -> i32`

[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.

`fetch_or` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::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: i32, order: Ordering) -> i32`

[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.

`fetch_xor` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(0b101101);
    assert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101);
    assert_eq!(foo.load(Ordering::SeqCst), 0b011110);Run

####

`pub fn fetch_update<F>( &self, f: F, fetch_order: Ordering, set_order: Ordering ) -> Result<i32, i32> where F: FnMut(i32) -> Option<i32>,`

[src]

🔬 This is a nightly-only experimental API. (`no_more_cas` #48655)

no more CAS loops in user code

Fetches the value, and applies a function to it that returns an optional new value. Returns a `Result` of `Ok(previous_value)` if the function returned `Some(_)`, else `Err(previous_value)`.

Note: This may call the function multiple times if the value has been changed from other threads in the meantime, as long as the function returns `Some(_)`, but the function will have been applied but once to the stored value.

`fetch_update` takes two `Ordering` arguments to describe the memory ordering of this operation. The first describes the required ordering for loads and failed updates while the second describes the required ordering when the operation finally succeeds. Beware that this is different from the two modes in `compare_exchange`!

Using `Acquire` as success ordering makes the store part of this operation `Relaxed`, and using `Release` makes the final successful load `Relaxed`. The (failed) load ordering can only be `SeqCst`, `Acquire` or `Relaxed` and must be equivalent to or weaker than the success ordering.

# Examples

    #![feature(no_more_cas)]
    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let x = AtomicI32::new(7);
    assert_eq!(x.fetch_update(|_| None, Ordering::SeqCst, Ordering::SeqCst), Err(7));
    assert_eq!(x.fetch_update(|x| Some(x + 1), Ordering::SeqCst, Ordering::SeqCst), Ok(7));
    assert_eq!(x.fetch_update(|x| Some(x + 1), Ordering::SeqCst, Ordering::SeqCst), Ok(8));
    assert_eq!(x.load(Ordering::SeqCst), 9);Run

####

`pub fn fetch_max(&self, val: i32, order: Ordering) -> i32`

[src]

🔬 This is a nightly-only experimental API. (`atomic_min_max` #48655)

easier and faster min/max than writing manual CAS loop

Maximum with the current value.

Finds the maximum of the current value and the argument `val`, and sets the new value to the result.

Returns the previous value.

`fetch_max` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(atomic_min_max)]
    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(23);
    assert_eq!(foo.fetch_max(42, Ordering::SeqCst), 23);
    assert_eq!(foo.load(Ordering::SeqCst), 42);Run

If you want to obtain the maximum value in one step, you can use the following:

    #![feature(atomic_min_max)]
    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(23);
    let bar = 42;
    let max_foo = foo.fetch_max(bar, Ordering::SeqCst).max(bar);
    assert!(max_foo == 42);Run

####

`pub fn fetch_min(&self, val: i32, order: Ordering) -> i32`

[src]

🔬 This is a nightly-only experimental API. (`atomic_min_max` #48655)

easier and faster min/max than writing manual CAS loop

Minimum with the current value.

Finds the minimum of the current value and the argument `val`, and sets the new value to the result.

Returns the previous value.

`fetch_min` takes an `Ordering` argument which describes the memory ordering of this operation. All ordering modes are possible. Note that using `Acquire` makes the store part of this operation `Relaxed`, and using `Release` makes the load part `Relaxed`.

# Examples

    #![feature(atomic_min_max)]
    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(23);
    assert_eq!(foo.fetch_min(42, Ordering::Relaxed), 23);
    assert_eq!(foo.load(Ordering::Relaxed), 23);
    assert_eq!(foo.fetch_min(22, Ordering::Relaxed), 23);
    assert_eq!(foo.load(Ordering::Relaxed), 22);Run

If you want to obtain the minimum value in one step, you can use the following:

    #![feature(atomic_min_max)]
    #![feature(integer_atomics)]

    use std::sync::atomic::{AtomicI32, Ordering};

    let foo = AtomicI32::new(23);
    let bar = 12;
    let min_foo = foo.fetch_min(bar, Ordering::SeqCst).min(bar);
    assert_eq!(min_foo, 12);Run

## Trait Implementations

###

`impl Default for AtomicI32`

[src]

####

`fn default() -> AtomicI32`

[src]

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

###

`impl Debug for AtomicI32`

[src]

####

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

[src]

Formats the value using the given formatter. Read more

###

`impl From<i32> for AtomicI32`

[src]

####

`fn from(v: i32) -> AtomicI32`

[src]

Performs the conversion.

###

`impl Sync for AtomicI32`

[src]

###

`impl RefUnwindSafe for AtomicI32`

[src]

## Auto Trait Implementations

###

`impl Send for AtomicI32`

## Blanket Implementations

###

`impl<T> From for T`

[src]

####

`fn from(t: T) -> T`

[src]

Performs the conversion.

###

`impl<T, U> TryFrom for T where T: From<U>,`

[src]

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

[src]

#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from` #33417)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from` #33417)

Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

[src]

####

`fn into(self) -> U`

[src]

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

[src]

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow(&self) -> &T`

[src]

Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

[src]

####
ⓘImportant traits for &'a mut I

### Important traits for &'a mut I

`impl<'a, I> Iterator for &'a mut I where
I: Iterator + ?Sized, type Item = <I as Iterator>::Item;impl<'a, R: Read + ?Sized> Read for &'a mut Rimpl<'a, W: Write + ?Sized> Write for &'a mut W`

`fn borrow_mut(&mut self) -> &mut T`

[src]

Mutably borrows from an owned value. Read more

###

`impl<T> Any for T where T: 'static + ?Sized,`

[src]

####

`fn get_type_id(&self) -> TypeId`

[src]

🔬 This is a nightly-only experimental API. (`get_type_id` #27745)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

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