Cleanup warnings

Implement interrupt on signal in pipe:

src/sync/wait_condition.rs

@@ -2,7 +2,7 @@ use alloc::arc::Arc;
 use collections::Vec;
 use spin::{Mutex, RwLock};
 
-use context::{self, Context};
+use context::{self, Context, SwitchResult};
 
 #[derive(Debug)]
 pub struct WaitCondition {
@@ -25,7 +25,7 @@ impl WaitCondition {
         len
     }
 
-    pub fn wait(&self) {
+    pub fn wait(&self) -> SwitchResult {
         {
             let context_lock = {
                 let contexts = context::contexts();
@@ -37,7 +37,8 @@ impl WaitCondition {
 
             self.contexts.lock().push(context_lock);
         }
-        unsafe { context::switch(); }
+
+        unsafe { context::switch() }
     }
 }
 

src/sync/wait_map.rs

@@ -27,7 +27,7 @@ impl<K, V> WaitMap<K, V> where K: Clone + Ord {
             if let Some(value) = self.receive_nonblock(key) {
                 return value;
             }
-            self.condition.wait();
+            let _ = self.condition.wait();
         }
     }
 
@@ -45,7 +45,7 @@ impl<K, V> WaitMap<K, V> where K: Clone + Ord {
             if let Some(entry) = self.receive_any_nonblock() {
                 return entry;
             }
-            self.condition.wait();
+            let _ = self.condition.wait();
         }
     }
 

src/sync/wait_queue.rs

@@ -33,7 +33,7 @@ impl<T> WaitQueue<T> {
             if let Some(value) = self.inner.lock().pop_front() {
                 return value;
             }
-            self.condition.wait();
+            let _ = self.condition.wait();
         }
     }