1 files changed, 45 insertions, 0 deletions
diff --git a/library/std/src/sys/sgx/condvar.rs b/library/std/src/sys/sgx/condvar.rs
new file mode 100644
index 000000000..36534e0ef
--- /dev/null
+++ b/library/std/src/sys/sgx/condvar.rs
@@ -0,0 +1,45 @@
+use crate::sys::locks::Mutex;
+use crate::sys_common::lazy_box::{LazyBox, LazyInit};
+use crate::time::Duration;
+
+use super::waitqueue::{SpinMutex, WaitQueue, WaitVariable};
+
+pub struct Condvar {
+    inner: SpinMutex<WaitVariable<()>>,
+}
+
+pub(crate) type MovableCondvar = LazyBox<Condvar>;
+
+impl LazyInit for Condvar {
+    fn init() -> Box<Self> {
+        Box::new(Self::new())
+    }
+}
+
+impl Condvar {
+    pub const fn new() -> Condvar {
+        Condvar { inner: SpinMutex::new(WaitVariable::new(())) }
+    }
+
+    #[inline]
+    pub unsafe fn notify_one(&self) {
+        let _ = WaitQueue::notify_one(self.inner.lock());
+    }
+
+    #[inline]
+    pub unsafe fn notify_all(&self) {
+        let _ = WaitQueue::notify_all(self.inner.lock());
+    }
+
+    pub unsafe fn wait(&self, mutex: &Mutex) {
+        let guard = self.inner.lock();
+        WaitQueue::wait(guard, || unsafe { mutex.unlock() });
+        unsafe { mutex.lock() }
+    }
+
+    pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
+        let success = WaitQueue::wait_timeout(&self.inner, dur, || unsafe { mutex.unlock() });
+        unsafe { mutex.lock() };
+        success
+    }
+}