Struct core::sync::atomic::AtomicUsize1.0.0 [] [src]

pub struct AtomicUsize {
    // some fields omitted
}

An integer type which can be safely shared between threads.

Methods

impl AtomicUsize
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const fn new(v: usize) -> Self

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) -> usize

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: usize, order: Ordering)

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: usize, order: Ordering) -> usize

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: usize, new: usize, order: Ordering) -> usize

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: usize, new: usize, success: Ordering, failure: Ordering) -> Result<usize, usize>

Unstable (extended_compare_and_swap #31767)

: recently added

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: usize, new: usize, success: Ordering, failure: Ordering) -> Result<usize, usize>

Unstable (extended_compare_and_swap #31767)

: recently added

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: usize, order: Ordering) -> usize

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: usize, order: Ordering) -> usize

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: usize, order: Ordering) -> usize

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: usize, order: Ordering) -> usize

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: usize, order: Ordering) -> usize

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 AtomicUsize
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fn default() -> Self

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

impl Debug for AtomicUsize
1.3.0
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fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.

impl Sync for AtomicUsize
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