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#![allow(dead_code)] // not used on all platforms
use crate::collections::BTreeMap;
use crate::ptr;
use crate::sync::atomic::{AtomicUsize, Ordering};
pub type Key = usize;
type Dtor = unsafe extern fn(*mut u8);
static NEXT_KEY: AtomicUsize = AtomicUsize::new(0);
static mut KEYS: *mut BTreeMap<Key, Option<Dtor>> = ptr::null_mut();
#[thread_local]
static mut LOCALS: *mut BTreeMap<Key, *mut u8> = ptr::null_mut();
unsafe fn keys() -> &'static mut BTreeMap<Key, Option<Dtor>> {
if KEYS == ptr::null_mut() {
KEYS = Box::into_raw(Box::new(BTreeMap::new()));
}
&mut *KEYS
}
unsafe fn locals() -> &'static mut BTreeMap<Key, *mut u8> {
if LOCALS == ptr::null_mut() {
LOCALS = Box::into_raw(Box::new(BTreeMap::new()));
}
&mut *LOCALS
}
#[inline]
pub unsafe fn create(dtor: Option<Dtor>) -> Key {
let key = NEXT_KEY.fetch_add(1, Ordering::SeqCst);
keys().insert(key, dtor);
key
}
#[inline]
pub unsafe fn get(key: Key) -> *mut u8 {
if let Some(&entry) = locals().get(&key) {
entry
} else {
ptr::null_mut()
}
}
#[inline]
pub unsafe fn set(key: Key, value: *mut u8) {
locals().insert(key, value);
}
#[inline]
pub unsafe fn destroy(key: Key) {
keys().remove(&key);
}
#[inline]
pub fn requires_synchronized_create() -> bool {
false
}
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