Struct ergo_sync::AtomicUsize

pub struct AtomicUsize { /* fields omitted */ }

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 AtomicUsize

const fn new(v: usize) -> AtomicUsize

Creates a new atomic integer.

Examples

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

let atomic_forty_two  = AtomicIsize::new(42);

fn get_mut(&mut self) -> &mut usize

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);

fn into_inner(self) -> usize

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);

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

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

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 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);

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

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>

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);

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

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,
    }
}

fn fetch_add(&self, val: usize, order: Ordering) -> usize

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);

fn fetch_sub(&self, val: usize, order: Ordering) -> usize

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);

fn fetch_and(&self, val: usize, order: Ordering) -> usize

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);

fn fetch_or(&self, val: usize, order: Ordering) -> usize

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);

fn fetch_xor(&self, val: usize, order: Ordering) -> usize

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);

Trait Implementations

impl RefUnwindSafe for AtomicUsize

impl Debug for AtomicUsize

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

impl Default for AtomicUsize

fn default() -> AtomicUsize

impl Sync for AtomicUsize