From c97d5262f56814639fa995c8426384efdf379c55 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Kr=C3=B6ger?= <timokroeger93@gmail.com>
Date: Wed, 30 Dec 2020 12:15:49 +0100
Subject: [PATCH] Blocking wait method for signals

---
 embassy/src/util/signal.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/embassy/src/util/signal.rs b/embassy/src/util/signal.rs
index bde10c56..cb641061 100644
--- a/embassy/src/util/signal.rs
+++ b/embassy/src/util/signal.rs
@@ -62,4 +62,13 @@ impl<T: Send> Signal<T> {
     pub fn wait(&self) -> impl Future<Output = T> + '_ {
         futures::future::poll_fn(move |cx| self.poll_wait(cx))
     }
+
+    /// Blocks until the signal has been received.
+    ///
+    /// Returns immediately when [`poll_wait()`] has not been called before.
+    pub fn blocking_wait(&self) {
+        while cortex_m::interrupt::free(|_| {
+            matches!(unsafe { &*self.state.get() }, State::Waiting(_))
+        }) {}
+    }
 }