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|
use std::{
any::{type_name, TypeId},
cell::RefCell,
collections::HashMap,
hash::BuildHasherDefault,
os::raw::c_int,
sync::atomic::{AtomicBool, AtomicUsize, Ordering::Relaxed},
sync::Arc,
};
use dashmap::DashMap;
use once_cell::sync::OnceCell;
use rustc_hash::FxHasher;
use crate::{AllCounts, Counts};
static ENABLE: AtomicBool = AtomicBool::new(cfg!(feature = "print_at_exit"));
type GlobalStore = DashMap<TypeId, Arc<Store>, BuildHasherDefault<FxHasher>>;
#[inline]
fn global_store() -> &'static GlobalStore {
static MAP: OnceCell<GlobalStore> = OnceCell::new();
MAP.get_or_init(|| {
if cfg!(feature = "print_at_exit") {
extern "C" {
fn atexit(f: extern "C" fn()) -> c_int;
}
extern "C" fn print_at_exit() {
eprint!("{}", get_all());
}
unsafe {
atexit(print_at_exit);
}
}
GlobalStore::default()
})
}
thread_local! {
static LOCAL: RefCell<HashMap<TypeId, Arc<Store>, BuildHasherDefault<FxHasher>>> = RefCell::default();
}
pub(crate) fn enable(yes: bool) {
ENABLE.store(yes, Relaxed);
}
#[inline]
fn enabled() -> bool {
ENABLE.load(Relaxed)
}
#[inline]
pub(crate) fn dec<T: 'static>() {
if enabled() {
do_dec(TypeId::of::<T>())
}
}
#[inline(never)]
fn do_dec(key: TypeId) {
LOCAL.with(|local| {
// Fast path: we have needed store in thread local map
if let Some(store) = local.borrow().get(&key) {
store.dec();
return;
}
let global = global_store();
// Slightly slower: we don't have needed store in our thread local map,
// but some other thread has already initialized the needed store in the global map
if let Some(store) = global.get(&key) {
let store = store.value();
local.borrow_mut().insert(key, Arc::clone(store));
store.inc();
return;
}
// We only decrement counter after incremenrting it, so this line is unreachable
})
}
#[inline]
pub(crate) fn inc<T: 'static>() {
if enabled() {
do_inc(TypeId::of::<T>(), type_name::<T>())
}
}
#[inline(never)]
fn do_inc(key: TypeId, name: &'static str) {
LOCAL.with(|local| {
// Fast path: we have needed store in thread local map
if let Some(store) = local.borrow().get(&key) {
store.inc();
return;
}
let global = global_store();
let copy = match global.get(&key) {
// Slightly slower path: we don't have needed store in our thread local map,
// but some other thread has already initialized the needed store in the global map
Some(store) => {
let store = store.value();
store.inc();
Arc::clone(store)
}
// Slow path: we are the first to initialize both global and local maps
None => {
let store = global
.entry(key)
.or_insert_with(|| Arc::new(Store { name, ..Store::default() }))
.downgrade();
let store = store.value();
store.inc();
Arc::clone(store)
}
};
local.borrow_mut().insert(key, copy);
});
}
pub(crate) fn get<T: 'static>() -> Counts {
do_get(TypeId::of::<T>())
}
fn do_get(key: TypeId) -> Counts {
global_store().entry(key).or_default().value().read()
}
pub(crate) fn get_all() -> AllCounts {
let mut entries = global_store()
.iter()
.map(|entry| {
let store = entry.value();
(store.type_name(), store.read())
})
.collect::<Vec<_>>();
entries.sort_by_key(|(name, _counts)| *name);
AllCounts { entries }
}
#[derive(Default)]
struct Store {
total: AtomicUsize,
max_live: AtomicUsize,
live: AtomicUsize,
name: &'static str,
}
impl Store {
fn inc(&self) {
self.total.fetch_add(1, Relaxed);
let live = self.live.fetch_add(1, Relaxed) + 1;
self.max_live.fetch_max(live, Relaxed);
}
fn dec(&self) {
self.live.fetch_sub(1, Relaxed);
}
fn read(&self) -> Counts {
Counts {
total: self.total.load(Relaxed),
max_live: self.max_live.load(Relaxed),
live: self.live.load(Relaxed),
}
}
fn type_name(&self) -> &'static str {
self.name
}
}
|
