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GeezerVison is showing github.com — feather/feather/server/src/player_count.rs at develop · aheart/feather

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player_count.rs

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use std::sync::{
atomic::{AtomicU32, Ordering},
Arc,
};
#[derive(Debug)]
pub struct MaxPlayersReached;
/// Maintains the server player count.
///
/// Can be cloned to create a new handle.
#[derive(Clone)]
pub struct PlayerCount {
inner: Arc<Inner>,
}
impl PlayerCount {
pub fn new(max_players: u32) -> Self {
Self {
inner: Arc::new(Inner {
count: AtomicU32::new(0),
max_players,
}),
}
}
pub fn try_add_player(&self) -> Result<(), MaxPlayersReached> {
loop {
let current_count = self.inner.count.load(Ordering::SeqCst);
let new_count = current_count + 1;
if new_count > self.inner.max_players {
return Err(MaxPlayersReached);
}
if self
.inner
.count
.compare_exchange(current_count, new_count, Ordering::SeqCst, Ordering::SeqCst)
.is_ok()
{
return Ok(());
}
}
}
pub fn remove_player(&self) {
self.inner.count.fetch_sub(1, Ordering::SeqCst);
}
pub fn get(&self) -> u32 {
self.inner.count.load(Ordering::Acquire)
}
}
struct Inner {
count: AtomicU32,
max_players: u32,
}
#[cfg(test)]
mod tests {
use crossbeam_utils::thread;
use super::*;
#[test]
fn try_add() {
let count = PlayerCount::new(1);
assert_eq!(count.get(), 0);
count.try_add_player().unwrap();
assert_eq!(count.get(), 1);
for _ in 0..10 {
count.try_add_player().unwrap_err();
assert_eq!(count.get(), 1);
}
}
#[test]
fn no_race_conditions() {
let threads = 8;
let players_per_thread = 100000;
let max_players = threads * players_per_thread / 2;
let count = PlayerCount::new(max_players);
let num_added = AtomicU32::new(0);
thread::scope(|s| {
for _ in 0..threads {
s.spawn(|_| {
for _ in 0..players_per_thread {
if count.try_add_player().is_ok() {
num_added.fetch_add(1, Ordering::SeqCst);
}
}
});
}
})
.unwrap();
assert_eq!(num_added.load(Ordering::SeqCst), max_players);
assert_eq!(count.get(), max_players);
}
}
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