From 8d922d13bd5c2f09a476a07578d523b4bed38933 Mon Sep 17 00:00:00 2001
From: Dorian Weber <weber@informatik.hu-berlin.de>
Date: Mon, 15 Feb 2021 12:49:15 +0100
Subject: [PATCH] Fixed a subtle bug with regards to the Promise.
---
src/lib.rs | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/lib.rs b/src/lib.rs
index 4b6f41a..8c51b76 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -565,8 +565,9 @@ impl<T> Promise<T> {
/// Writes the result value and reawakens the caller.
pub fn fulfill(&self, result: T) {
- self.result.replace(Some(result));
- self.caller.wake_by_ref();
+ if self.result.replace(Some(result)).is_none() {
+ self.caller.wake_by_ref();
+ }
}
/// Extracts the written value and resets the state of the promise.
--
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