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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| use std::{ | ||
| collections::{hash_map::Entry, HashMap}, | ||
| hash::Hash, | ||
| marker::PhantomData, | ||
| }; | ||
|
|
||
| use parking_lot::Mutex; | ||
| use serde::{Deserialize, Deserializer, Serialize, Serializer}; | ||
| use turbo_tasks::event::Event; | ||
|
|
||
| pub struct MutexMap<K> { | ||
| map: Mutex<HashMap<K, Option<(Event, usize)>>>, | ||
| } | ||
|
|
||
| impl<K> Default for MutexMap<K> { | ||
| fn default() -> Self { | ||
| Self { | ||
| map: Mutex::new(HashMap::new()), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<'a, K: Eq + Hash + Clone> MutexMap<K> { | ||
| pub async fn lock(&'a self, key: K) -> MutexMapGuard<'a, K> { | ||
| let listener = { | ||
| let mut map = self.map.lock(); | ||
| match map.entry(key.clone()) { | ||
| Entry::Occupied(mut e) => { | ||
| let state = e.get_mut(); | ||
| Some(match state { | ||
| Some((event, count)) => { | ||
| *count += 1; | ||
| event.listen() | ||
| } | ||
| None => { | ||
| let event = Event::new(|| "MutexMap".to_string()); | ||
| let listener = event.listen(); | ||
| *state = Some((event, 0)); | ||
| listener | ||
| } | ||
| }) | ||
| } | ||
| Entry::Vacant(e) => { | ||
| e.insert(None); | ||
| None | ||
| } | ||
| } | ||
| }; | ||
| if let Some(listener) = listener { | ||
| listener.await; | ||
| } | ||
| MutexMapGuard { | ||
| map: self, | ||
| key: Some(key), | ||
| } | ||
| } | ||
| } | ||
|
|
||
| pub struct MutexMapGuard<'a, K: Eq + Hash> { | ||
| map: &'a MutexMap<K>, | ||
| key: Option<K>, | ||
| } | ||
|
|
||
| impl<'a, K: Eq + Hash> Drop for MutexMapGuard<'a, K> { | ||
| fn drop(&mut self) { | ||
| if let Some(key) = self.key.take() { | ||
| let mut map = self.map.map.lock(); | ||
| if let Entry::Occupied(mut e) = map.entry(key) { | ||
| let value = e.get_mut(); | ||
| match value { | ||
| Some((event, count)) => { | ||
| event.notify(1); | ||
| if *count == 0 { | ||
| *value = None; | ||
| } else { | ||
| *count -= 1; | ||
| } | ||
| } | ||
| None => { | ||
| e.remove(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl<K> Serialize for MutexMap<K> { | ||
| fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> { | ||
| serializer.serialize_unit() | ||
| } | ||
| } | ||
|
|
||
| impl<'de, K> Deserialize<'de> for MutexMap<K> { | ||
| fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error> { | ||
| struct Visitor<K>(PhantomData<MutexMap<K>>); | ||
| impl<'de, K> serde::de::Visitor<'de> for Visitor<K> { | ||
| type Value = MutexMap<K>; | ||
| fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result { | ||
| formatter.write_str("a unit") | ||
| } | ||
| fn visit_unit<E: serde::de::Error>(self) -> Result<Self::Value, E> { | ||
| Ok(MutexMap::default()) | ||
| } | ||
| } | ||
| deserializer.deserialize_unit(Visitor(std::marker::PhantomData)) | ||
| } | ||
| } |
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