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use std::sync::atomic::{fence, AtomicI64, Ordering};
use crate::utils::types::Index;
#[derive(Default)]
pub struct AtomicVec<T: Clone> {
buf: Vec<T>,
begin_change: AtomicI64,
end_change: AtomicI64,
}
impl<T: Clone> AtomicVec<T> {
pub fn new() -> Self {
Self {
buf: vec![],
begin_change: AtomicI64::from(-1),
end_change: AtomicI64::from(-1),
}
}
pub fn load(&self) -> &Vec<T> {
loop {
let change_number = self.end_change.load(Ordering::Acquire);
fence(Ordering::Acquire);
if change_number == self.begin_change.load(Ordering::Acquire) {
return &self.buf;
}
}
}
pub fn load_mut(&mut self) -> &mut Vec<T> {
loop {
let change_number = self.end_change.load(Ordering::Acquire);
fence(Ordering::Acquire);
if change_number == self.begin_change.load(Ordering::Acquire) {
return &mut self.buf;
}
}
}
pub fn load_val(&mut self) -> Vec<T> {
loop {
let change_number = self.end_change.load(Ordering::Acquire);
fence(Ordering::Acquire);
if change_number == self.begin_change.load(Ordering::Acquire) {
let tmp_vec = self.buf.clone();
return tmp_vec;
}
}
}
pub fn store(&mut self, new_value: Vec<T>) {
let mut seq_no: i64 = self.begin_change.load(Ordering::Acquire) + 1;
if seq_no == std::i64::MAX {
seq_no = 0;
}
self.begin_change.store(seq_no, Ordering::Release);
self.buf = new_value;
self.end_change.store(seq_no, Ordering::Release);
}
pub fn add(&mut self, item: T) -> Vec<T> {
let old_vec = self.load().clone();
let mut new_vec = old_vec.clone();
new_vec.push(item);
self.store(new_vec);
old_vec
}
pub fn remove(&mut self, matching_fn: impl Fn(&mut T) -> bool) -> Option<(Vec<T>, Index)> {
let mut old_vec = self.load().clone();
let mut new_vec = old_vec.clone();
for (index, item) in old_vec.iter_mut().enumerate() {
if matching_fn(item) {
new_vec.remove(index);
self.store(new_vec);
return Some((old_vec, index as Index));
}
}
None
}
}