Struct core::sync::atomic::AtomicUsize
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pub struct AtomicUsize {
v: UnsafeCell<usize>,
}An unsigned integer type which can be safely shared between threads.
Fields
v |
Methods
impl AtomicUsize
const fn new(v: usize) -> AtomicUsize
Creates a new AtomicUsize.
Examples
fn main() { use std::sync::atomic::AtomicUsize; let atomic_forty_two = AtomicUsize::new(42); }use std::sync::atomic::AtomicUsize; let atomic_forty_two = AtomicUsize::new(42);
fn load(&self, order: Ordering) -> usize
Loads a value from the usize.
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::{AtomicUsize, Ordering}; let some_usize = AtomicUsize::new(5); assert_eq!(some_usize.load(Ordering::Relaxed), 5); }use std::sync::atomic::{AtomicUsize, Ordering}; let some_usize = AtomicUsize::new(5); assert_eq!(some_usize.load(Ordering::Relaxed), 5);
fn store(&self, val: usize, order: Ordering)
Stores a value into the usize.
store takes an Ordering argument which describes the memory ordering of this operation.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let some_usize = AtomicUsize::new(5); some_usize.store(10, Ordering::Relaxed); assert_eq!(some_usize.load(Ordering::Relaxed), 10); }use std::sync::atomic::{AtomicUsize, Ordering}; let some_usize = AtomicUsize::new(5); some_usize.store(10, Ordering::Relaxed); assert_eq!(some_usize.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 usize, returning the old value.
swap takes an Ordering argument which describes the memory ordering of this operation.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let some_usize= AtomicUsize::new(5); assert_eq!(some_usize.swap(10, Ordering::Relaxed), 5); assert_eq!(some_usize.load(Ordering::Relaxed), 10); }use std::sync::atomic::{AtomicUsize, Ordering}; let some_usize= AtomicUsize::new(5); assert_eq!(some_usize.swap(10, Ordering::Relaxed), 5); assert_eq!(some_usize.load(Ordering::Relaxed), 10);
fn compare_and_swap(&self, current: usize, new: usize, order: Ordering) -> usize
Stores a value into the usize 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::{AtomicUsize, Ordering}; let some_usize = AtomicUsize::new(5); assert_eq!(some_usize.compare_and_swap(5, 10, Ordering::Relaxed), 5); assert_eq!(some_usize.load(Ordering::Relaxed), 10); assert_eq!(some_usize.compare_and_swap(6, 12, Ordering::Relaxed), 10); assert_eq!(some_usize.load(Ordering::Relaxed), 10); }use std::sync::atomic::{AtomicUsize, Ordering}; let some_usize = AtomicUsize::new(5); assert_eq!(some_usize.compare_and_swap(5, 10, Ordering::Relaxed), 5); assert_eq!(some_usize.load(Ordering::Relaxed), 10); assert_eq!(some_usize.compare_and_swap(6, 12, Ordering::Relaxed), 10); assert_eq!(some_usize.load(Ordering::Relaxed), 10);
fn fetch_add(&self, val: usize, order: Ordering) -> usize
Add to the current usize, returning the previous value.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(0); assert_eq!(foo.fetch_add(10, Ordering::SeqCst), 0); assert_eq!(foo.load(Ordering::SeqCst), 10); }use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::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 usize, returning the previous value.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(10); assert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 10); assert_eq!(foo.load(Ordering::SeqCst), 0); }use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(10); assert_eq!(foo.fetch_sub(10, Ordering::SeqCst), 10); assert_eq!(foo.load(Ordering::SeqCst), 0);
fn fetch_and(&self, val: usize, order: Ordering) -> usize
Bitwise and with the current usize, returning the previous value.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(0b101101); assert_eq!(foo.fetch_and(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b100001); }use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::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 usize, returning the previous value.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(0b101101); assert_eq!(foo.fetch_or(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b111111); }use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::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 usize, returning the previous value.
Examples
fn main() { use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(0b101101); assert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b011110); }use std::sync::atomic::{AtomicUsize, Ordering}; let foo = AtomicUsize::new(0b101101); assert_eq!(foo.fetch_xor(0b110011, Ordering::SeqCst), 0b101101); assert_eq!(foo.load(Ordering::SeqCst), 0b011110);