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use alloc::arc::Arc;
use core::sync::atomic::{AtomicUsize, Ordering};
use rng_trait::Rng;
use super::prng::{MULTIPLIER, OFFSET, MAX};
#[derive(Clone, Debug)]
pub struct AtomicPrng {
seed: Arc<AtomicUsize>,
}
impl AtomicPrng {
#[inline]
pub fn new() -> Self {
AtomicPrng {
seed: Arc::new(AtomicUsize::new(&false as *const _ as usize)),
}
}
#[inline(always)]
pub fn seed(&self) -> usize {
self.seed.load(Ordering::Relaxed)
}
#[inline(always)]
pub fn set_seed(&self, seed: usize) {
self.seed.store(seed, Ordering::Relaxed);
}
#[inline]
pub fn next(&self) -> usize {
let seed = &self.seed;
let current_seed = seed.load(Ordering::Relaxed);
let next_seed = ((MULTIPLIER.wrapping_mul(current_seed)).wrapping_add(OFFSET)) % MAX;
seed.compare_and_swap(current_seed, next_seed, Ordering::Relaxed);
next_seed
}
}
impl Rng for AtomicPrng {
#[inline(always)]
fn next(&mut self) -> usize {
AtomicPrng::next(self)
}
}