Add more from the std

library/std/src/sys/sync/condvar/no_threads.rs

@@ -0,0 +1,27 @@
+use crate::sys::sync::Mutex;
+use crate::thread::sleep;
+use crate::time::Duration;
+
+pub struct Condvar {}
+
+impl Condvar {
+    #[inline]
+    pub const fn new() -> Condvar {
+        Condvar {}
+    }
+
+    #[inline]
+    pub fn notify_one(&self) {}
+
+    #[inline]
+    pub fn notify_all(&self) {}
+
+    pub unsafe fn wait(&self, _mutex: &Mutex) {
+        panic!("condvar wait not supported")
+    }
+
+    pub unsafe fn wait_timeout(&self, _mutex: &Mutex, dur: Duration) -> bool {
+        sleep(dur);
+        false
+    }
+}