From 92f7ba8446d397bb92f68ea1b45fd893d9410b86 Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Tue, 6 Oct 2020 00:34:15 +0200
Subject: [PATCH] Add WaitOnAddress/WakeByAddress API to sys::windows::c.

---
 library/std/src/sys/windows/c.rs      | 15 +++++++++++++++
 library/std/src/sys/windows/compat.rs |  1 +
 2 files changed, 16 insertions(+)

diff --git a/library/std/src/sys/windows/c.rs b/library/std/src/sys/windows/c.rs
index 559c4dc9c7c..6a088b91b51 100644
--- a/library/std/src/sys/windows/c.rs
+++ b/library/std/src/sys/windows/c.rs
@@ -1096,3 +1096,18 @@ compat_fn! {
         panic!("rwlocks not available")
     }
 }
+compat_fn! {
+    "api-ms-win-core-synch-l1-2-0":
+    pub fn WaitOnAddress(
+        Address: LPVOID,
+        CompareAddress: LPVOID,
+        AddressSize: SIZE_T,
+        dwMilliseconds: DWORD
+    ) -> BOOL {
+        panic!("WaitOnAddress not available")
+    }
+    pub fn WakeByAddressSingle(Address: LPVOID) -> () {
+        // If this api is unavailable, there cannot be anything waiting, because
+        // WaitOnAddress would've panicked. So it's fine to do nothing here.
+    }
+}
diff --git a/library/std/src/sys/windows/compat.rs b/library/std/src/sys/windows/compat.rs
index 3f25f05e1b9..a5151ab620c 100644
--- a/library/std/src/sys/windows/compat.rs
+++ b/library/std/src/sys/windows/compat.rs
@@ -34,6 +34,7 @@ macro_rules! compat_fn {
     )*) => ($(
         $(#[$meta])*
         pub mod $symbol {
+            #[allow(unused_imports)]
             use super::*;
             use crate::sync::atomic::{AtomicUsize, Ordering};
             use crate::mem;