1 files changed, 27 insertions, 0 deletions
diff --git a/vendor/windows-strings/src/ref_count.rs b/vendor/windows-strings/src/ref_count.rs
new file mode 100644
index 00000000..c6309f9f
--- /dev/null
+++ b/vendor/windows-strings/src/ref_count.rs
@@ -0,0 +1,27 @@
+use core::sync::atomic::{fence, AtomicI32, Ordering};
+
+#[repr(transparent)]
+#[derive(Default)]
+pub struct RefCount(pub(crate) AtomicI32);
+
+impl RefCount {
+    pub fn new(count: u32) -> Self {
+        Self(AtomicI32::new(count as i32))
+    }
+
+    pub fn add_ref(&self) -> u32 {
+        (self.0.fetch_add(1, Ordering::Relaxed) + 1) as u32
+    }
+
+    pub fn release(&self) -> u32 {
+        let remaining = self.0.fetch_sub(1, Ordering::Release) - 1;
+
+        match remaining.cmp(&0) {
+            core::cmp::Ordering::Equal => fence(Ordering::Acquire),
+            core::cmp::Ordering::Less => panic!("Object has been over-released."),
+            core::cmp::Ordering::Greater => {}
+        }
+
+        remaining as u32
+    }
+}