2 files changed, 19 insertions, 0 deletions
diff --git a/library/std/src/sys/wasm/futex_atomics.rs b/library/std/src/sys/wasm/futex_atomics.rs
new file mode 100644
index 00000000000..3d8bf42f725
--- /dev/null
+++ b/library/std/src/sys/wasm/futex_atomics.rs
@@ -0,0 +1,17 @@
+use crate::arch::wasm32;
+use crate::convert::TryInto;
+use crate::sync::atomic::AtomicI32;
+use crate::time::Duration;
+
+pub fn futex_wait(futex: &AtomicI32, expected: i32, timeout: Option<Duration>) {
+    let timeout = timeout.and_then(|t| t.as_nanos().try_into().ok()).unwrap_or(-1);
+    unsafe {
+        wasm32::memory_atomic_wait32(futex as *const AtomicI32 as *mut i32, expected, timeout);
+    }
+}
+
+pub fn futex_wake(futex: &AtomicI32) {
+    unsafe {
+        wasm32::memory_atomic_notify(futex as *const AtomicI32 as *mut i32, 1);
+    }
+}
diff --git a/library/std/src/sys/wasm/mod.rs b/library/std/src/sys/wasm/mod.rs
index 18295e1129a..11c6896f050 100644
--- a/library/std/src/sys/wasm/mod.rs
+++ b/library/std/src/sys/wasm/mod.rs
@@ -55,6 +55,8 @@ cfg_if::cfg_if! {
         pub mod mutex;
         #[path = "rwlock_atomics.rs"]
         pub mod rwlock;
+        #[path = "futex_atomics.rs"]
+        pub mod futex;
     } else {
         #[path = "../unsupported/condvar.rs"]
         pub mod condvar;