auto merge of #6577 : brson/rust/io-upstream, r=pcwalton

r?

This is all of my scheduler work on #4419 from the last 3 weeks or so. I've had a few failed pull requests so far but I think the problems are ironed out.

* TCP
* The beginnings of runtime embedding APIs
* Porting various corners of core to be compatible with both schedulers
* libuv timer bindings
* Further refinement of I/O error handling, including a new, incomplete, `read_error` condition
* Incomplete refactoring to make tasks work without coroutines and user-space scheduling
* Implementations of Reader/Writer extension methods
* Implementations of the most important part of core::comm

I'm particularly happy with how easy the [comm types on top of the scheduler](https://github.com/brson/rust/blob/io-upstream/src/libcore/rt/comm.rs). Note that these implementations do not use pipes. If anything here needs careful review though it's this code.

This branch passes 95% of the run-pass tests (with `TESTARGS=--newrt`)

In the next week I'll probably spend some time adding preliminary multithreading and seeing how close we are to removing the old runtime.

1 files changed, 2 insertions, 5 deletions

diff --git a/src/libstd/workcache.rs b/src/libstd/workcache.rs
index f173df60df8..3889650d012 100644
--- a/src/libstd/workcache.rs
+++ b/src/libstd/workcache.rs
@@ -15,11 +15,10 @@ use sort;
 
 use core::cell::Cell;
 use core::cmp;
-use core::comm::{PortOne, oneshot, send_one};
+use core::comm::{PortOne, oneshot, send_one, recv_one};
 use core::either::{Either, Left, Right};
 use core::hashmap::HashMap;
 use core::io;
-use core::pipes::recv;
 use core::run;
 use core::to_bytes;
 use core::util::replace;
@@ -389,9 +388,7 @@ fn unwrap<T:Owned +
         None => fail!(),
         Some(Left(v)) => v,
         Some(Right(port)) => {
-            let (exe, v) = match recv(port.unwrap()) {
-                oneshot::send(data) => data
-            };
+            let (exe, v) = recv_one(port);
 
             let s = json_encode(&v);