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macro_rules! atomic128 {
($atomic_type:ident, $int_type:ident) => {
#[repr(C, align(16))]
pub(crate) struct $atomic_type {
v: core::cell::UnsafeCell<$int_type>,
}
// Send is implicitly implemented.
// SAFETY: any data races are prevented by atomic intrinsics.
unsafe impl Sync for $atomic_type {}
impl $atomic_type {
#[inline]
pub(crate) const fn new(v: $int_type) -> Self {
Self { v: core::cell::UnsafeCell::new(v) }
}
#[inline]
pub(crate) fn is_lock_free() -> bool {
Self::is_always_lock_free()
}
#[inline]
pub(crate) const fn is_always_lock_free() -> bool {
true
}
#[inline]
pub(crate) fn get_mut(&mut self) -> &mut $int_type {
self.v.get_mut()
}
#[inline]
pub(crate) fn into_inner(self) -> $int_type {
self.v.into_inner()
}
#[inline]
pub(crate) fn load(&self, order: Ordering) -> $int_type {
crate::utils::assert_load_ordering(order);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_load(self.v.get().cast(), order) as $int_type }
}
#[inline]
pub(crate) fn store(&self, val: $int_type, order: Ordering) {
crate::utils::assert_store_ordering(order);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_store(self.v.get().cast(), val as u128, order) }
}
#[inline]
pub(crate) fn swap(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe { atomic_swap(self.v.get().cast(), val as u128, order) as $int_type }
}
#[inline]
pub(crate) fn compare_exchange(
&self,
current: $int_type,
new: $int_type,
success: Ordering,
failure: Ordering,
) -> Result<$int_type, $int_type> {
crate::utils::assert_compare_exchange_ordering(success, failure);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
match atomic_compare_exchange(
self.v.get().cast(),
current as u128,
new as u128,
success,
failure,
) {
Ok(v) => Ok(v as $int_type),
Err(v) => Err(v as $int_type),
}
}
}
#[inline]
pub(crate) fn compare_exchange_weak(
&self,
current: $int_type,
new: $int_type,
success: Ordering,
failure: Ordering,
) -> Result<$int_type, $int_type> {
crate::utils::assert_compare_exchange_ordering(success, failure);
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
match atomic_compare_exchange_weak(
self.v.get().cast(),
current as u128,
new as u128,
success,
failure,
) {
Ok(v) => Ok(v as $int_type),
Err(v) => Err(v as $int_type),
}
}
}
#[inline]
pub(crate) fn fetch_add(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| x.wrapping_add(val as u128))
as $int_type
}
}
#[inline]
pub(crate) fn fetch_sub(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| x.wrapping_sub(val as u128))
as $int_type
}
}
#[inline]
pub(crate) fn fetch_and(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| x & val as u128) as $int_type
}
}
#[inline]
pub(crate) fn fetch_nand(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| !(x & val as u128)) as $int_type
}
}
#[inline]
pub(crate) fn fetch_or(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| x | val as u128) as $int_type
}
}
#[inline]
pub(crate) fn fetch_xor(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| x ^ val as u128) as $int_type
}
}
#[inline]
pub(crate) fn fetch_max(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| {
core::cmp::max(x as $int_type, val) as u128
}) as $int_type
}
}
#[inline]
pub(crate) fn fetch_min(&self, val: $int_type, order: Ordering) -> $int_type {
// SAFETY: any data races are prevented by atomic intrinsics and the raw
// pointer passed in is valid because we got it from a reference.
unsafe {
atomic_update(self.v.get().cast(), order, |x| {
core::cmp::min(x as $int_type, val) as u128
}) as $int_type
}
}
}
};
}