use std::cell::UnsafeCell;
use std::fmt::{Debug, Formatter};
use std::ops::{Deref, DerefMut, Index, IndexMut};
use std::slice::SliceIndex;
use std::sync::Arc;
use std::slice::{Iter as SliceIter, IterMut as SliceIterMut};
use serde::{Deserializer, Serialize, Serializer};
use serde::ser::SerializeSeq;
use tokio::sync::{Mutex, MutexGuard};
pub type SyncVec<V> = SyncVecImpl<V>;
pub struct SyncVecImpl<V> {
read: UnsafeCell<Vec<V>>,
dirty: Mutex<Vec<V>>,
}
impl<V> Drop for SyncVecImpl<V> {
fn drop(&mut self) {
unsafe {
loop {
match (&mut *self.read.get()).pop() {
None => {
break;
}
Some(v) => {
std::mem::forget(v)
}
}
}
}
}
}
unsafe impl<V> Send for SyncVecImpl<V> {}
unsafe impl<V> Sync for SyncVecImpl<V> {}
impl<V> SyncVecImpl<V> {
pub fn new_arc() -> Arc<Self> {
Arc::new(Self::new())
}
pub fn new() -> Self {
Self {
read: UnsafeCell::new(Vec::new()),
dirty: Mutex::new(Vec::new()),
}
}
pub fn with_capacity(capacity: usize) -> Self {
Self {
read: UnsafeCell::new(Vec::with_capacity(capacity)),
dirty: Mutex::new(Vec::with_capacity(capacity)),
}
}
pub async fn insert(&self, index: usize, v: V) -> Option<V> {
let mut m = self.dirty.lock().await;
m.insert(index, v);
let len = m.len();
unsafe {
let r = m.get_unchecked(len - 1);
(&mut *self.read.get()).insert(index, std::ptr::read(r));
}
None
}
pub async fn push(&self, v: V) -> Option<V> {
let mut m = self.dirty.lock().await;
m.push(v);
let len = m.len();
unsafe {
let r = m.get_unchecked(len - 1);
(&mut *self.read.get()).push(std::ptr::read(r));
}
None
}
pub fn push_mut(&mut self, v: V) -> Option<V> {
let mut m = self.dirty.get_mut();
m.push(v);
let len = m.len();
unsafe {
let r = m.get_unchecked(len - 1);
(&mut *self.read.get()).push(std::ptr::read(r));
}
None
}
pub async fn pop(&self) -> Option<V> {
let mut m = self.dirty.lock().await;
match m.pop() {
None => {
return None;
}
Some(s) => {
unsafe {
let r = (&mut *self.read.get()).pop();
match r {
None => {}
Some(r) => {
std::mem::forget(r);
}
}
}
return Some(s);
}
}
}
pub fn pop_mut(&mut self) -> Option<V> {
let mut m = self.dirty.get_mut();
match m.pop() {
None => {
return None;
}
Some(s) => {
unsafe {
let r = (&mut *self.read.get()).pop();
match r {
None => {}
Some(r) => {
std::mem::forget(r);
}
}
}
return Some(s);
}
}
}
pub async fn remove(&self, index: usize) -> Option<V> {
match self.get(index) {
None => {
None
}
Some(_) => {
let mut m = self.dirty.lock().await;
let v = m.remove(index);
unsafe {
let r = (&mut *self.read.get()).remove(index);
std::mem::forget(r);
}
Some(v)
}
}
}
pub fn len(&self) -> usize {
unsafe {
(&*self.read.get()).len()
}
}
pub fn is_empty(&self) -> bool {
unsafe {
(&*self.read.get()).is_empty()
}
}
pub async fn clear(&self) {
let mut m = self.dirty.lock().await;
m.clear();
unsafe {
loop {
match (&mut *self.read.get()).pop() {
None => {
break;
}
Some(v) => {
std::mem::forget(v)
}
}
}
}
}
pub async fn shrink_to_fit(&self) {
let mut m = self.dirty.lock().await;
unsafe {
(&mut *self.read.get()).shrink_to_fit()
}
m.shrink_to_fit()
}
pub fn from(map: Vec<V>) -> Self {
let mut s = Self::with_capacity(map.capacity());
let mut m = s.dirty.get_mut();
*m = map;
unsafe {
for v in m.iter() {
(&mut *s.read.get()).push(std::ptr::read(v));
}
}
drop(m);
s
}
pub fn get(&self, index: usize) -> Option<&V>
{
unsafe {
let k = (&*self.read.get()).get(index);
match k {
None => { None }
Some(s) => {
Some(s)
}
}
}
}
pub unsafe fn get_uncheck(&self, index: usize) -> Option<&V>
{
unsafe {
let k = (&*self.read.get()).get_unchecked(index);
Some(k)
}
}
pub async fn get_mut(&self, index: usize) -> Option<VecRefMut<'_, V>>
{
let mut m = self.dirty.lock().await;
let mut r = VecRefMut {
g: m,
value: None,
};
unsafe {
r.value = Some(change_lifetime_mut(r.g.get_mut(index)?));
}
Some(r)
}
pub fn iter(&self) -> SliceIter<'_, V> {
unsafe {
(&*self.read.get()).iter()
}
}
pub async fn iter_mut(&self) -> IterMut<'_, V> {
let mut m = self.dirty.lock().await;
let mut iter = IterMut {
g: m,
inner: None,
};
unsafe {
iter.inner = Some(change_lifetime_mut(&mut iter.g).iter_mut());
}
return iter;
}
pub fn into_iter(self) -> SliceIter<'static, V> {
unsafe {
(&*self.read.get()).iter()
}
}
}
pub unsafe fn change_lifetime_const<'a, 'b, T>(x: &'a T) -> &'b T {
&*(x as *const T)
}
pub unsafe fn change_lifetime_mut<'a, 'b, T>(x: &'a mut T) -> &'b mut T {
&mut *(x as *mut T)
}
pub struct VecRefMut<'a, V> {
g: MutexGuard<'a, Vec<V>>,
value: Option<&'a mut V>,
}
impl<'a, V> Deref for VecRefMut<'_, V> {
type Target = V;
fn deref(&self) -> &Self::Target {
self.value.as_ref().unwrap()
}
}
impl<'a, V> DerefMut for VecRefMut<'_, V> {
fn deref_mut(&mut self) -> &mut Self::Target {
self.value.as_mut().unwrap()
}
}
impl<'a, V> Debug for VecRefMut<'_, V> where V: Debug {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
self.value.fmt(f)
}
}
pub struct Iter<'a, V> {
inner: Option<SliceIter<'a, *const V>>,
}
impl<'a, V> Iterator for Iter<'a, V> {
type Item = &'a V;
fn next(&mut self) -> Option<Self::Item> {
let next = self.inner.as_mut().unwrap().next();
match next {
None => { None }
Some(v) => {
if v.is_null() {
None
} else {
unsafe {
Some(&**v)
}
}
}
}
}
}
pub struct IterMut<'a, V> {
g: MutexGuard<'a, Vec<V>>,
inner: Option<SliceIterMut<'a, V>>,
}
impl<'a, V> Deref for IterMut<'a, V> {
type Target = SliceIterMut<'a, V>;
fn deref(&self) -> &Self::Target {
self.inner.as_ref().unwrap()
}
}
impl<'a, V> DerefMut for IterMut<'a, V> {
fn deref_mut(&mut self) -> &mut Self::Target {
self.inner.as_mut().unwrap()
}
}
impl<'a, V> Iterator for IterMut<'a, V> {
type Item = &'a mut V;
fn next(&mut self) -> Option<Self::Item> {
self.inner.as_mut().unwrap().next()
}
}
impl<'a, V> IntoIterator for &'a SyncVecImpl<V> {
type Item = &'a V;
type IntoIter = SliceIter<'a, V>;
fn into_iter(self) -> Self::IntoIter {
self.iter()
}
}
impl<V> serde::Serialize for SyncVecImpl<V> where V: Serialize {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer {
let mut m = serializer.serialize_seq(Some(self.len()))?;
for v in self.iter() {
m.serialize_element(v);
}
m.end()
}
}
impl<'de, V> serde::Deserialize<'de> for SyncVecImpl<V> where V: serde::Deserialize<'de> {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> {
let m = Vec::deserialize(deserializer)?;
Ok(Self::from(m))
}
}
impl<V> Debug for SyncVecImpl<V> where V: Debug {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
let mut m = f.debug_list();
for v in self.iter() {
m.entry(v);
}
m.finish()
}
}
impl<V> Index<usize> for SyncVecImpl<V> {
type Output = V;
fn index(&self, index: usize) -> &Self::Output {
self.get(index).unwrap()
}
}
#[cfg(test)]
mod test {
use std::ops::Deref;
use std::sync::Arc;
use std::sync::atomic::{Ordering};
use std::thread::sleep;
use std::time::Duration;
use crate::sync::vec::SyncVec;
#[tokio::test]
pub async fn test_debug() {
let m: SyncVec<i32> = SyncVec::new();
m.push(1).await;
println!("{:?}", m);
assert_eq!(format!("{:?}", m), "[1]");
}
#[test]
pub fn test_empty() {
let m: SyncVec<i32> = SyncVec::new();
assert_eq!(0, m.len());
}
#[tokio::test]
pub async fn test_push() {
let m = SyncVec::<i32>::new();
let insert = m.push(1).await;
assert_eq!(insert.is_none(), true);
}
#[tokio::test]
pub async fn test_push2() {
let m = Arc::new(SyncVec::<String>::new());
m.push("1".to_string()).await;
;
m.push("2".to_string()).await;
;
m.push("3".to_string()).await;
;
assert_eq!(&"1".to_string(), m.get(0).unwrap());
assert_eq!(&"2".to_string(), m.get(1).unwrap());
assert_eq!(&"3".to_string(), m.get(2).unwrap());
}
#[tokio::test]
pub async fn test_get() {
let m = SyncVec::<i32>::new();
let insert = m.push(2).await;
let g = m.get(0).unwrap();
assert_eq!(&2, g);
}
#[derive(Clone, Debug, Eq, PartialEq, Hash)]
pub struct A {
inner: i32,
}
impl Drop for A {
fn drop(&mut self) {
println!("droped");
}
}
#[tokio::test]
pub async fn test_remove() {
let a = A { inner: 0 };
let m = SyncVec::<A>::new();
let insert = m.push(a).await;
let g = m.get(0).unwrap();
let rm = m.remove(0).await.unwrap();
println!("rm:{:?}", rm);
drop(rm);
assert_eq!(true, m.is_empty());
assert_eq!(true, m.dirty.lock().await.is_empty());
assert_eq!(None, m.get(0));
assert_eq!(&A { inner: 0 }, g);
}
#[tokio::test]
pub async fn test_remove2() {
let m = SyncVec::<String>::new();
for i in 0..1000000 {
m.push(String::from("safdfasdfasdfasdfasdfasdfsadf")).await;
;
}
sleep(Duration::from_secs(2));
println!("start clean");
m.clear();
m.shrink_to_fit();
println!("done,now you can see mem usage");
sleep(Duration::from_secs(5));
for i in 0..1000000 {
m.push(String::from("safdfasdfasdfasdfasdfasdfsadf")).await;
;
}
sleep(Duration::from_secs(2));
println!("start clean");
m.clear();
m.shrink_to_fit();
println!("done,now you can see mem usage");
sleep(Duration::from_secs(5));
}
#[tokio::test]
pub async fn test_iter() {
let m = SyncVec::<i32>::new();
let insert = m.push(2).await;
;
for v in m.iter() {
assert_eq!(*v, 2);
}
}
#[tokio::test]
pub async fn test_iter_mut() {
let m = SyncVec::<i32>::new();
let insert = m.push(2).await;
;
for v in m.iter_mut().await {
assert_eq!(*v, 2);
}
}
}