Port future to pipes. Graph500 is about 21% faster now.

Making all tests pass.

src/libcore/future.rs

@@ -22,7 +22,10 @@
 export with;
 export spawn;
 
-/// The future type
+// for task.rs
+export future_pipe;
+
+#[doc = "The future type"]
 enum future<A> = {
     mut v: either<@A, fn@() -> A>
 };
@@ -56,16 +59,34 @@ fn from_value<A>(+val: A) -> future<A> {
     })
 }
 
-fn from_port<A:send>(-port: comm::port<A>) -> future<A> {
-    /*!
-     * Create a future from a port
-     *
-     * The first time that the value is requested the task will block
-     * waiting for the result to be received on the port.
-     */
+fn macros() {
+    #macro[
+        [#recv[chan],
+         chan.recv()(chan)]
+    ];
+    #macro[
+        [#move[x],
+         unsafe { let y <- *ptr::addr_of(x); y }]
+    ];
+}
 
-    do from_fn {
-        comm::recv(port)
+fn from_port<A:send>(-port: future_pipe::client::waiting<A>) -> future<A> {
+    #[doc = "
+    Create a future from a port
+
+    The first time that the value is requested the task will block
+    waiting for the result to be received on the port.
+    "];
+    import future_pipe::client::recv;
+
+    let port = ~mut some(port);
+    do from_fn |move port| {
+        let mut port_ = none;
+        port_ <-> *port;
+        let port = option::unwrap(port_);
+        alt (#recv(port)) {
+          future_pipe::completed(data, _next) { #move(data) }
+        }
     }
 }
 
@@ -91,12 +112,9 @@ fn spawn<A:send>(+blk: fn~() -> A) -> future<A> {
      * value of the future.
      */
 
-    let mut po = comm::port();
-    let ch = comm::chan(po);
-    do task::spawn {
-        comm::send(ch, blk())
-    };
-    from_port(po)
+    from_port(pipes::spawn_service_recv(future_pipe::init, |ch| {
+        future_pipe::server::completed(ch, blk());
+    }))
 }
 
 fn get<A:copy>(future: future<A>) -> A {
@@ -119,6 +137,48 @@ fn with<A,B>(future: future<A>, blk: fn(A) -> B) -> B {
     blk(*v)
 }
 
+// The pipe protocol, generated by pipec
+mod future_pipe {
+    fn init<T: send>() -> (client::waiting<T>, server::waiting<T>) {
+        { let (s, c) = pipes::entangle(); (c, s) }
+    }
+    enum waiting<T: send> { completed(T, client::terminated), }
+    enum terminated { }
+    mod client {
+        impl recv<T: send> for waiting<T> {
+            fn recv() -> extern fn(+waiting<T>) -> future_pipe::waiting<T> {
+                fn recv<T: send>(+pipe: waiting<T>) ->
+                   future_pipe::waiting<T> {
+                    option::unwrap(pipes::recv(pipe))
+                }
+                recv
+            }
+        }
+        type waiting<T: send> = pipes::recv_packet<future_pipe::waiting<T>>;
+        type terminated = pipes::send_packet<future_pipe::terminated>;
+    }
+    mod server {
+        fn completed<T: send>(+pipe: waiting<T>, +x_0: T) -> terminated {
+            {
+                let (s, c) = pipes::entangle();
+                let message = future_pipe::completed(x_0, s);
+                pipes::send(pipe, message);
+                c
+            }
+        }
+        type waiting<T: send> = pipes::send_packet<future_pipe::waiting<T>>;
+        impl recv for terminated {
+            fn recv() -> extern fn(+terminated) -> future_pipe::terminated {
+                fn recv(+pipe: terminated) -> future_pipe::terminated {
+                    option::unwrap(pipes::recv(pipe))
+                }
+                recv
+            }
+        }
+        type terminated = pipes::recv_packet<future_pipe::terminated>;
+    }
+}
+
 #[test]
 fn test_from_value() {
     let f = from_value("snail");
@@ -127,9 +187,8 @@ fn test_from_value() {
 
 #[test]
 fn test_from_port() {
-    let po = comm::port();
-    let ch = comm::chan(po);
-    comm::send(ch, "whale");
+    let (po, ch) = future_pipe::init();
+    future_pipe::server::completed(ch, "whale");
     let f = from_port(po);
     assert get(f) == "whale";
 }

src/libcore/pipes.rs

@@ -239,3 +239,22 @@ fn spawn_service<T: send>(
 
     client
 }
+
+fn spawn_service_recv<T: send>(
+    init: native fn() -> (recv_packet<T>, send_packet<T>),
+    +service: fn~(+send_packet<T>))
+    -> recv_packet<T>
+{
+    let (client, server) = init();
+
+    // This is some nasty gymnastics required to safely move the pipe
+    // into a new task.
+    let server = ~mut some(server);
+    do task::spawn |move service| {
+        let mut server_ = none;
+        server_ <-> *server;
+        service(option::unwrap(server_))
+    }
+
+    client
+}

src/libcore/task.rs

@@ -308,11 +308,21 @@ fn future_result(builder: builder) -> future::future<task_result> {
 fn future_task(builder: builder) -> future::future<task> {
     //! Get a future representing the handle to the new task
 
-    let mut po = comm::port();
-    let ch = comm::chan(po);
-    do add_wrapper(builder) |body| {
-        fn~() {
-            comm::send(ch, get_task());
+    import future::future_pipe;
+
+    let (po, ch) = future_pipe::init();
+
+    let ch = ~mut some(ch);
+
+    do add_wrapper(builder) |body, move ch| {
+        let ch = { let mut t = none;
+                  t <-> *ch;
+                  ~mut t};
+        fn~(move ch) {
+            let mut po = none;
+            po <-> *ch;
+            future_pipe::server::completed(option::unwrap(po),
+                                           get_task());
             body();
         }
     }