windows_strings/
ref_count.rs

1use core::sync::atomic::{fence, AtomicI32, Ordering};
2
3#[repr(transparent)]
4#[derive(Default)]
5pub struct RefCount(pub(crate) AtomicI32);
6
7impl RefCount {
8    pub fn new(count: u32) -> Self {
9        Self(AtomicI32::new(count as i32))
10    }
11
12    pub fn add_ref(&self) -> u32 {
13        (self.0.fetch_add(1, Ordering::Relaxed) + 1) as u32
14    }
15
16    pub fn release(&self) -> u32 {
17        let remaining = self.0.fetch_sub(1, Ordering::Release) - 1;
18
19        match remaining.cmp(&0) {
20            core::cmp::Ordering::Equal => fence(Ordering::Acquire),
21            core::cmp::Ordering::Less => panic!("Object has been over-released."),
22            core::cmp::Ordering::Greater => {}
23        }
24
25        remaining as u32
26    }
27}

windows_strings/ref_count.rs

windows_strings/
ref_count.rs