1 files changed, 23 insertions, 0 deletions
diff --git a/library/std/src/sys/thread/wasm.rs b/library/std/src/sys/thread/wasm.rs
new file mode 100644
index 00000000000..e843bc992ba
--- /dev/null
+++ b/library/std/src/sys/thread/wasm.rs
@@ -0,0 +1,23 @@
+use crate::cmp;
+use crate::time::Duration;
+
+pub fn sleep(dur: Duration) {
+    #[cfg(target_arch = "wasm32")]
+    use core::arch::wasm32 as wasm;
+    #[cfg(target_arch = "wasm64")]
+    use core::arch::wasm64 as wasm;
+
+    // Use an atomic wait to block the current thread artificially with a
+    // timeout listed. Note that we should never be notified (return value
+    // of 0) or our comparison should never fail (return value of 1) so we
+    // should always only resume execution through a timeout (return value
+    // 2).
+    let mut nanos = dur.as_nanos();
+    while nanos > 0 {
+        let amt = cmp::min(i64::MAX as u128, nanos);
+        let mut x = 0;
+        let val = unsafe { wasm::memory_atomic_wait32(&mut x, 0, amt as i64) };
+        debug_assert_eq!(val, 2);
+        nanos -= amt;
+    }
+}