1 files changed, 30 insertions, 0 deletions
diff --git a/src/sync.rs b/src/sync.rs
new file mode 100644
index 0000000..08bcce3
--- /dev/null
+++ b/src/sync.rs
@@ -0,0 +1,30 @@
+use std::task::{Context, Poll, Waker};
+
+pub struct Signal{
+    waker: Option<Waker>,
+    active: bool,
+}
+impl Signal{
+    pub fn new() -> Self{
+        Self{
+            waker: None,
+            active: false,
+        }
+    }
+    pub fn wake(&mut self){
+        self.active = true;
+        if let Some(w) = self.waker.take(){
+            w.wake();
+        }
+    }
+    pub fn poll(&mut self, ctx: &mut Context<'_>) -> Poll<()>{
+        if self.active{
+            self.active = false;
+            Poll::Ready(())
+        }else{
+            self.waker = Some(ctx.waker().clone());
+            Poll::Pending
+        }
+    }
+}
+