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use crate::types::ValueType;
use std::sync::atomic::{
AtomicI16, AtomicI32, AtomicI64, AtomicI8, AtomicU16, AtomicU32, AtomicU64, AtomicU8,
};
use std::{cell::Cell, marker::PhantomData, ops::Deref, slice};
pub trait Atomic {
type Output;
}
impl Atomic for i8 {
type Output = AtomicI8;
}
impl Atomic for i16 {
type Output = AtomicI16;
}
impl Atomic for i32 {
type Output = AtomicI32;
}
impl Atomic for i64 {
type Output = AtomicI64;
}
impl Atomic for u8 {
type Output = AtomicU8;
}
impl Atomic for u16 {
type Output = AtomicU16;
}
impl Atomic for u32 {
type Output = AtomicU32;
}
impl Atomic for u64 {
type Output = AtomicU64;
}
impl Atomic for f32 {
type Output = AtomicU32;
}
impl Atomic for f64 {
type Output = AtomicU64;
}
pub trait Atomicity {}
pub struct Atomically;
impl Atomicity for Atomically {}
pub struct NonAtomically;
impl Atomicity for NonAtomically {}
pub struct MemoryView<'a, T: 'a, A = NonAtomically> {
ptr: *mut T,
length: usize,
_phantom: PhantomData<(&'a [Cell<T>], A)>,
}
impl<'a, T> MemoryView<'a, T, NonAtomically>
where
T: ValueType,
{
pub(super) unsafe fn new(ptr: *mut T, length: u32) -> Self {
Self {
ptr,
length: length as usize,
_phantom: PhantomData,
}
}
}
impl<'a, T: Atomic> MemoryView<'a, T> {
pub fn atomically(&self) -> MemoryView<'a, T::Output, Atomically> {
MemoryView {
ptr: self.ptr as *mut T::Output,
length: self.length,
_phantom: PhantomData,
}
}
}
impl<'a, T> Deref for MemoryView<'a, T, NonAtomically> {
type Target = [Cell<T>];
fn deref(&self) -> &[Cell<T>] {
let mut_slice: &mut [T] = unsafe { slice::from_raw_parts_mut(self.ptr, self.length) };
let cell_slice: &Cell<[T]> = Cell::from_mut(mut_slice);
cell_slice.as_slice_of_cells()
}
}
impl<'a, T> Deref for MemoryView<'a, T, Atomically> {
type Target = [T];
fn deref(&self) -> &[T] {
unsafe { slice::from_raw_parts(self.ptr as *const T, self.length) }
}
}