From 73d63488e4a23de46a6312525ccb7b4d04a7c55f Mon Sep 17 00:00:00 2001
From: Mara Bos <m-ou.se@m-ou.se>
Date: Thu, 17 Mar 2022 12:27:30 +0100
Subject: [PATCH] Add futex_wake_all.

---
 library/std/src/sys/unix/futex.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/library/std/src/sys/unix/futex.rs b/library/std/src/sys/unix/futex.rs
index 22ba1a57fef2..cc6da97ec730 100644
--- a/library/std/src/sys/unix/futex.rs
+++ b/library/std/src/sys/unix/futex.rs
@@ -66,6 +66,18 @@ pub fn futex_wake(futex: &AtomicI32) {
     }
 }
 
+#[cfg(any(target_os = "linux", target_os = "android"))]
+pub fn futex_wake_all(futex: &AtomicI32) {
+    unsafe {
+        libc::syscall(
+            libc::SYS_futex,
+            futex as *const AtomicI32,
+            libc::FUTEX_WAKE | libc::FUTEX_PRIVATE_FLAG,
+            i32::MAX,
+        );
+    }
+}
+
 #[cfg(target_os = "emscripten")]
 pub fn futex_wake(futex: &AtomicI32) {
     extern "C" {