Implement Condvar::wait_timeout for targets without threads

This always falls back to sleeping since there is no way
to notify a condvar on a target without threads.

1 files changed, 4 insertions, 2 deletions

diff --git a/library/std/src/sys/sync/condvar/no_threads.rs b/library/std/src/sys/sync/condvar/no_threads.rs
index 88ce39305e1..18d97d4b17a 100644
--- a/library/std/src/sys/sync/condvar/no_threads.rs
+++ b/library/std/src/sys/sync/condvar/no_threads.rs
@@ -1,4 +1,5 @@
 use crate::sys::sync::Mutex;
+use crate::thread::sleep;
 use crate::time::Duration;
 
 pub struct Condvar {}
@@ -19,7 +20,8 @@ impl Condvar {
         panic!("condvar wait not supported")
     }
 
-    pub unsafe fn wait_timeout(&self, _mutex: &Mutex, _dur: Duration) -> bool {
-        panic!("condvar wait not supported");
+    pub unsafe fn wait_timeout(&self, _mutex: &Mutex, dur: Duration) -> bool {
+        sleep(dur);
+        false
     }
 }