From 7a9a6e45911636eae3ec4e1c111bc0e120601a5a Mon Sep 17 00:00:00 2001
From: Brian Anderson <banderson@mozilla.com>
Date: Thu, 20 Jun 2013 18:26:56 -0700
Subject: [PATCH] std: Port SharedChan to newsched

---
 src/libstd/comm.rs    | 40 +++++++++++++++++++++++++---------------
 src/libstd/rt/task.rs | 12 ++++++++++++
 2 files changed, 37 insertions(+), 15 deletions(-)

diff --git a/src/libstd/comm.rs b/src/libstd/comm.rs
index 7918abe4ae6a..00c33c8ab325 100644
--- a/src/libstd/comm.rs
+++ b/src/libstd/comm.rs
@@ -220,7 +220,7 @@ impl<T: Owned> Peekable<T> for PortSet<T> {
 
 /// A channel that can be shared between many senders.
 pub struct SharedChan<T> {
-    ch: Exclusive<pipesy::Chan<T>>
+    inner: Either<Exclusive<pipesy::Chan<T>>, rtcomm::SharedChan<T>>
 }
 
 impl<T: Owned> SharedChan<T> {
@@ -228,40 +228,50 @@ impl<T: Owned> SharedChan<T> {
     pub fn new(c: Chan<T>) -> SharedChan<T> {
         let Chan { inner } = c;
         let c = match inner {
-            Left(c) => c,
-            Right(_) => fail!("SharedChan not implemented")
+            Left(c) => Left(exclusive(c)),
+            Right(c) => Right(rtcomm::SharedChan::new(c))
         };
-        SharedChan { ch: exclusive(c) }
+        SharedChan { inner: c }
     }
 }
 
 impl<T: Owned> GenericChan<T> for SharedChan<T> {
     fn send(&self, x: T) {
-        unsafe {
-            let mut xx = Some(x);
-            do self.ch.with_imm |chan| {
-                let x = replace(&mut xx, None);
-                chan.send(x.unwrap())
+        match self.inner {
+            Left(ref chan) => {
+                unsafe {
+                    let mut xx = Some(x);
+                    do chan.with_imm |chan| {
+                        let x = replace(&mut xx, None);
+                        chan.send(x.unwrap())
+                    }
+                }
             }
+            Right(ref chan) => chan.send(x)
         }
     }
 }
 
 impl<T: Owned> GenericSmartChan<T> for SharedChan<T> {
     fn try_send(&self, x: T) -> bool {
-        unsafe {
-            let mut xx = Some(x);
-            do self.ch.with_imm |chan| {
-                let x = replace(&mut xx, None);
-                chan.try_send(x.unwrap())
+        match self.inner {
+            Left(ref chan) => {
+                unsafe {
+                    let mut xx = Some(x);
+                    do chan.with_imm |chan| {
+                        let x = replace(&mut xx, None);
+                        chan.try_send(x.unwrap())
+                    }
+                }
             }
+            Right(ref chan) => chan.try_send(x)
         }
     }
 }
 
 impl<T: Owned> ::clone::Clone for SharedChan<T> {
     fn clone(&self) -> SharedChan<T> {
-        SharedChan { ch: self.ch.clone() }
+        SharedChan { inner: self.inner.clone() }
     }
 }
 
diff --git a/src/libstd/rt/task.rs b/src/libstd/rt/task.rs
index e7f87906fe59..833f25b253c0 100644
--- a/src/libstd/rt/task.rs
+++ b/src/libstd/rt/task.rs
@@ -248,6 +248,18 @@ mod test {
         }
     }
 
+    #[test]
+    fn comm_shared_chan() {
+        use comm::*;
+
+        do run_in_newsched_task() {
+            let (port, chan) = stream();
+            let chan = SharedChan::new(chan);
+            chan.send(10);
+            assert!(port.recv() == 10);
+        }
+    }
+
     #[test]
     fn linked_failure() {
         do run_in_newsched_task() {