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use super::AtomicU64;
use crate::loom::sync::{atomic::Ordering, Mutex};
use crate::util::once_cell::OnceCell;
pub(crate) struct StaticAtomicU64 {
init: u64,
cell: OnceCell<Mutex<u64>>,
}
impl AtomicU64 {
pub(crate) fn new(val: u64) -> Self {
Self {
inner: Mutex::new(val),
}
}
}
impl StaticAtomicU64 {
pub(crate) const fn new(val: u64) -> StaticAtomicU64 {
StaticAtomicU64 {
init: val,
cell: OnceCell::new(),
}
}
pub(crate) fn load(&self, order: Ordering) -> u64 {
*self.inner().lock()
}
pub(crate) fn fetch_add(&self, val: u64, order: Ordering) -> u64 {
let mut lock = self.inner().lock();
let prev = *lock;
*lock = prev + val;
prev
}
pub(crate) fn compare_exchange_weak(
&self,
current: u64,
new: u64,
_success: Ordering,
_failure: Ordering,
) -> Result<u64, u64> {
let mut lock = self.inner().lock();
if *lock == current {
*lock = new;
Ok(current)
} else {
Err(*lock)
}
}
fn inner(&self) -> &Mutex<u64> {
self.cell.get(|| Mutex::new(self.init))
}
}