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use std::sync::Arc;
use std::any::TypeId;
use std::collections::HashMap;
use std::cell::{RefCell, UnsafeCell};
use std::hash::{BuildHasherDefault, Hasher};
use join::Join;
use coroutine_impl::Coroutine;
use generator::get_local_data;
thread_local!{static LOCALMAP: LocalMap = RefCell::new(HashMap::default());}
pub struct CoroutineLocal {
co: Coroutine,
join: Arc<UnsafeCell<Join>>,
local_data: LocalMap,
}
impl CoroutineLocal {
pub fn new(co: Coroutine, join: Arc<UnsafeCell<Join>>) -> Box<Self> {
Box::new(CoroutineLocal {
co: co,
join: join,
local_data: RefCell::new(HashMap::default()),
})
}
pub fn get_co(&self) -> &Coroutine {
&self.co
}
pub fn get_join(&self) -> Arc<UnsafeCell<Join>> {
self.join.clone()
}
}
fn with<F: FnOnce(&LocalMap) -> R, R>(f: F) -> R {
let ptr = get_local_data();
if ptr.is_null() {
LOCALMAP.with(|data| f(data))
} else {
let local = unsafe { &*(ptr as *mut CoroutineLocal) };
let data = &local.local_data;
f(data)
}
}
pub type LocalMap = RefCell<HashMap<TypeId, Box<Opaque>, BuildHasherDefault<IdHasher>>>;
pub trait Opaque {}
impl<T> Opaque for T {}
pub struct LocalKey<T> {
#[doc(hidden)] pub __key: fn() -> TypeId,
#[doc(hidden)] pub __init: fn() -> T,
}
pub struct IdHasher {
id: u64,
}
impl Default for IdHasher {
fn default() -> IdHasher {
IdHasher { id: 0 }
}
}
impl Hasher for IdHasher {
fn write(&mut self, _bytes: &[u8]) {
panic!("can only hash u64");
}
fn write_u64(&mut self, u: u64) {
self.id = u;
}
fn finish(&self) -> u64 {
self.id
}
}
impl<T: 'static> LocalKey<T> {
pub fn with<F, R>(&'static self, f: F) -> R
where
F: FnOnce(&T) -> R,
{
let key = (self.__key)();
with(|data| {
let raw_pointer = {
let mut data = data.borrow_mut();
let entry = data.entry(key).or_insert_with(|| Box::new((self.__init)()));
&**entry as *const Opaque as *const T
};
unsafe { f(&*raw_pointer) }
})
}
}