Remove a lot of dead code

src/sync/wait_queue.rs

@@ -20,29 +20,6 @@ impl<T> WaitQueue<T> {
         }
     }
 
-    pub fn clone(&self) -> WaitQueue<T> where T: Clone {
-        WaitQueue {
-            inner: Mutex::new(self.inner.lock().clone()),
-            condition: WaitCondition::new()
-        }
-    }
-
-    pub fn is_empty(&self) -> bool {
-        self.inner.lock().is_empty()
-    }
-
-    pub fn receive(&self, reason: &'static str) -> Option<T> {
-        loop {
-            let mut inner = self.inner.lock();
-            if let Some(value) = inner.pop_front() {
-                return Some(value);
-            }
-            if ! self.condition.wait(inner, reason) {
-                return None;
-            }
-        }
-    }
-
     pub fn receive_into_user(&self, buf: UserSliceWo, block: bool, reason: &'static str) -> Result<usize> {
         loop {
             let mut inner = self.inner.lock();
@@ -79,29 +56,6 @@ impl<T> WaitQueue<T> {
         }
     }
 
-    pub fn receive_into(&self, buf: &mut [T], block: bool, reason: &'static str) -> Option<usize> {
-        let mut i = 0;
-
-        if i < buf.len() && block {
-            buf[i] = self.receive(reason)?;
-            i += 1;
-        }
-
-        {
-            let mut inner = self.inner.lock();
-            while i < buf.len() {
-                if let Some(value) = inner.pop_front() {
-                    buf[i] = value;
-                    i += 1;
-                } else {
-                    break;
-                }
-            }
-        }
-
-        Some(i)
-    }
-
     pub fn send(&self, value: T) -> usize {
         let len = {
             let mut inner = self.inner.lock();
@@ -111,14 +65,4 @@ impl<T> WaitQueue<T> {
         self.condition.notify();
         len
     }
-
-    pub fn send_from(&self, buf: &[T]) -> usize where T: Copy {
-        let len = {
-            let mut inner = self.inner.lock();
-            inner.extend(buf.iter());
-            inner.len()
-        };
-        self.condition.notify();
-        len
-    }
 }