v0.1.5 (#40)

Reviewed-on: wrenn/wrenn#40

envd-rs/src/util.rs

@@ -0,0 +1,33 @@
+use std::sync::atomic::{AtomicI64, Ordering};
+
+pub struct AtomicMax {
+    val: AtomicI64,
+}
+
+impl AtomicMax {
+    pub fn new() -> Self {
+        Self {
+            val: AtomicI64::new(i64::MIN),
+        }
+    }
+
+    /// Sets the stored value to `new` if `new` is strictly greater than
+    /// the current value. Returns `true` if the value was updated.
+    pub fn set_to_greater(&self, new: i64) -> bool {
+        loop {
+            let current = self.val.load(Ordering::Acquire);
+            if new <= current {
+                return false;
+            }
+            match self.val.compare_exchange_weak(
+                current,
+                new,
+                Ordering::Release,
+                Ordering::Relaxed,
+            ) {
+                Ok(_) => return true,
+                Err(_) => continue,
+            }
+        }
+    }
+}