diff --git a/src/libstd/io/net/tcp.rs b/src/libstd/io/net/tcp.rs
index a6230ede7e3..db51653d665 100644
--- a/src/libstd/io/net/tcp.rs
+++ b/src/libstd/io/net/tcp.rs
@@ -147,468 +147,439 @@ impl Acceptor<TcpStream> for TcpAcceptor {
 #[cfg(test)]
 mod test {
     use super::*;
-    use rt::test::*;
     use io::net::ip::{Ipv4Addr, SocketAddr};
     use io::*;
+    use io::test::{next_test_ip4, next_test_ip6};
     use prelude::*;
 
     #[test] #[ignore]
     fn bind_error() {
-        do run_in_mt_newsched_task {
-            let mut called = false;
-            io_error::cond.trap(|e| {
-                assert!(e.kind == PermissionDenied);
-                called = true;
-            }).inside(|| {
-                let addr = SocketAddr { ip: Ipv4Addr(0, 0, 0, 0), port: 1 };
-                let listener = TcpListener::bind(addr);
-                assert!(listener.is_none());
-            });
-            assert!(called);
-        }
+        let mut called = false;
+        io_error::cond.trap(|e| {
+            assert!(e.kind == PermissionDenied);
+            called = true;
+        }).inside(|| {
+            let addr = SocketAddr { ip: Ipv4Addr(0, 0, 0, 0), port: 1 };
+            let listener = TcpListener::bind(addr);
+            assert!(listener.is_none());
+        });
+        assert!(called);
     }
 
     #[test]
     fn connect_error() {
-        do run_in_mt_newsched_task {
-            let mut called = false;
-            io_error::cond.trap(|e| {
-                let expected_error = if cfg!(unix) {
-                    ConnectionRefused
-                } else {
-                    // On Win32, opening port 1 gives WSAEADDRNOTAVAIL error.
-                    OtherIoError
-                };
-                assert_eq!(e.kind, expected_error);
-                called = true;
-            }).inside(|| {
-                let addr = SocketAddr { ip: Ipv4Addr(0, 0, 0, 0), port: 1 };
-                let stream = TcpStream::connect(addr);
-                assert!(stream.is_none());
-            });
-            assert!(called);
-        }
+        let mut called = false;
+        io_error::cond.trap(|e| {
+            let expected_error = if cfg!(unix) {
+                ConnectionRefused
+            } else {
+                // On Win32, opening port 1 gives WSAEADDRNOTAVAIL error.
+                OtherIoError
+            };
+            assert_eq!(e.kind, expected_error);
+            called = true;
+        }).inside(|| {
+            let addr = SocketAddr { ip: Ipv4Addr(0, 0, 0, 0), port: 1 };
+            let stream = TcpStream::connect(addr);
+            assert!(stream.is_none());
+        });
+        assert!(called);
     }
 
     #[test]
     fn smoke_test_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let mut buf = [0];
-                stream.read(buf);
-                assert!(buf[0] == 99);
-            }
+        let addr = next_test_ip4();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let mut stream = TcpStream::connect(addr);
             stream.write([99]);
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let mut buf = [0];
+        stream.read(buf);
+        assert!(buf[0] == 99);
     }
 
     #[test]
     fn smoke_test_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let mut buf = [0];
-                stream.read(buf);
-                assert!(buf[0] == 99);
-            }
+        let addr = next_test_ip6();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let mut stream = TcpStream::connect(addr);
             stream.write([99]);
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let mut buf = [0];
+        stream.read(buf);
+        assert!(buf[0] == 99);
     }
 
     #[test]
     fn read_eof_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let mut buf = [0];
-                let nread = stream.read(buf);
-                assert!(nread.is_none());
-            }
+        let addr = next_test_ip4();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let _stream = TcpStream::connect(addr);
             // Close
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let mut buf = [0];
+        let nread = stream.read(buf);
+        assert!(nread.is_none());
     }
 
     #[test]
     fn read_eof_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let mut buf = [0];
-                let nread = stream.read(buf);
-                assert!(nread.is_none());
-            }
+        let addr = next_test_ip6();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let _stream = TcpStream::connect(addr);
             // Close
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let mut buf = [0];
+        let nread = stream.read(buf);
+        assert!(nread.is_none());
     }
 
     #[test]
     fn read_eof_twice_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            let (port, chan) = Chan::new();
+        let addr = next_test_ip4();
+        let (port, chan) = oneshot();
 
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let mut buf = [0];
-                let nread = stream.read(buf);
-                assert!(nread.is_none());
-                io_error::cond.trap(|e| {
-                    if cfg!(windows) {
-                        assert_eq!(e.kind, NotConnected);
-                    } else {
-                        fail!();
-                    }
-                }).inside(|| {
-                    let nread = stream.read(buf);
-                    assert!(nread.is_none());
-                })
-            }
-
-            port.recv();
+        do spawn {
+            port.take().recv();
             let _stream = TcpStream::connect(addr);
             // Close
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let mut buf = [0];
+        let nread = stream.read(buf);
+        assert!(nread.is_none());
+        io_error::cond.trap(|e| {
+            if cfg!(windows) {
+                assert_eq!(e.kind, NotConnected);
+            } else {
+                fail!();
+            }
+        }).inside(|| {
+            let nread = stream.read(buf);
+            assert!(nread.is_none());
+        })
     }
 
     #[test]
     fn read_eof_twice_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let mut buf = [0];
-                let nread = stream.read(buf);
-                assert!(nread.is_none());
-                io_error::cond.trap(|e| {
-                    if cfg!(windows) {
-                        assert_eq!(e.kind, NotConnected);
-                    } else {
-                        fail!();
-                    }
-                }).inside(|| {
-                    let nread = stream.read(buf);
-                    assert!(nread.is_none());
-                })
-            }
+        let addr = next_test_ip6();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let _stream = TcpStream::connect(addr);
             // Close
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let mut buf = [0];
+        let nread = stream.read(buf);
+        assert!(nread.is_none());
+        io_error::cond.trap(|e| {
+            if cfg!(windows) {
+                assert_eq!(e.kind, NotConnected);
+            } else {
+                fail!();
+            }
+        }).inside(|| {
+            let nread = stream.read(buf);
+            assert!(nread.is_none());
+        })
     }
 
     #[test]
     fn write_close_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let buf = [0];
-                loop {
-                    let mut stop = false;
-                    io_error::cond.trap(|e| {
-                        // NB: ECONNRESET on linux, EPIPE on mac, ECONNABORTED
-                        //     on windows
-                        assert!(e.kind == ConnectionReset ||
-                                e.kind == BrokenPipe ||
-                                e.kind == ConnectionAborted,
-                                "unknown error: {:?}", e);
-                        stop = true;
-                    }).inside(|| {
-                        stream.write(buf);
-                    });
-                    if stop { break }
-                }
-            }
+        let addr = next_test_ip4();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let _stream = TcpStream::connect(addr);
             // Close
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let buf = [0];
+        loop {
+            let mut stop = false;
+            io_error::cond.trap(|e| {
+                // NB: ECONNRESET on linux, EPIPE on mac, ECONNABORTED
+                //     on windows
+                assert!(e.kind == ConnectionReset ||
+                        e.kind == BrokenPipe ||
+                        e.kind == ConnectionAborted,
+                        "unknown error: {:?}", e);
+                stop = true;
+            }).inside(|| {
+                stream.write(buf);
+            });
+            if stop { break }
+        }
     }
 
     #[test]
     fn write_close_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                let mut stream = acceptor.accept();
-                let buf = [0];
-                loop {
-                    let mut stop = false;
-                    io_error::cond.trap(|e| {
-                        // NB: ECONNRESET on linux, EPIPE on mac, ECONNABORTED
-                        //     on windows
-                        assert!(e.kind == ConnectionReset ||
-                                e.kind == BrokenPipe ||
-                                e.kind == ConnectionAborted,
-                                "unknown error: {:?}", e);
-                        stop = true;
-                    }).inside(|| {
-                        stream.write(buf);
-                    });
-                    if stop { break }
-                }
-            }
+        let addr = next_test_ip6();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             let _stream = TcpStream::connect(addr);
             // Close
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        let mut stream = acceptor.accept();
+        let buf = [0];
+        loop {
+            let mut stop = false;
+            io_error::cond.trap(|e| {
+                // NB: ECONNRESET on linux, EPIPE on mac, ECONNABORTED
+                //     on windows
+                assert!(e.kind == ConnectionReset ||
+                        e.kind == BrokenPipe ||
+                        e.kind == ConnectionAborted,
+                        "unknown error: {:?}", e);
+                stop = true;
+            }).inside(|| {
+                stream.write(buf);
+            });
+            if stop { break }
+        }
     }
 
     #[test]
     fn multiple_connect_serial_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            let max = 10;
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                for ref mut stream in acceptor.incoming().take(max) {
-                    let mut buf = [0];
-                    stream.read(buf);
-                    assert_eq!(buf[0], 99);
-                }
-            }
+        let addr = next_test_ip4();
+        let max = 10;
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             max.times(|| {
                 let mut stream = TcpStream::connect(addr);
                 stream.write([99]);
             });
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        for ref mut stream in acceptor.incoming().take(max) {
+            let mut buf = [0];
+            stream.read(buf);
+            assert_eq!(buf[0], 99);
+        }
     }
 
     #[test]
     fn multiple_connect_serial_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            let max = 10;
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                for ref mut stream in acceptor.incoming().take(max) {
-                    let mut buf = [0];
-                    stream.read(buf);
-                    assert_eq!(buf[0], 99);
-                }
-            }
+        let addr = next_test_ip6();
+        let max = 10;
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             max.times(|| {
                 let mut stream = TcpStream::connect(addr);
                 stream.write([99]);
             });
         }
+
+        let mut acceptor = TcpListener::bind(addr).listen();
+        chan.send(());
+        for ref mut stream in acceptor.incoming().take(max) {
+            let mut buf = [0];
+            stream.read(buf);
+            assert_eq!(buf[0], 99);
+        }
     }
 
     #[test]
     fn multiple_connect_interleaved_greedy_schedule_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            static MAX: int = 10;
-            let (port, chan) = Chan::new();
+        let addr = next_test_ip4();
+        static MAX: int = 10;
+        let (port, chan) = oneshot();
 
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                for (i, stream) in acceptor.incoming().enumerate().take(MAX as uint) {
-                    // Start another task to handle the connection
-                    do spawntask {
-                        let mut stream = stream;
-                        let mut buf = [0];
-                        stream.read(buf);
-                        assert!(buf[0] == i as u8);
-                        debug!("read");
-                    }
+        do spawn {
+            let mut acceptor = TcpListener::bind(addr).listen();
+            chan.send(());
+            for (i, stream) in acceptor.incoming().enumerate().take(MAX as uint) {
+                let stream = Cell::new(stream);
+                // Start another task to handle the connection
+                do spawn {
+                    let mut stream = stream.take();
+                    let mut buf = [0];
+                    stream.read(buf);
+                    assert!(buf[0] == i as u8);
+                    debug!("read");
                 }
             }
+        }
 
-            port.recv();
-            connect(0, addr);
+        port.recv();
+        connect(0, addr);
 
-            fn connect(i: int, addr: SocketAddr) {
-                if i == MAX { return }
+        fn connect(i: int, addr: SocketAddr) {
+            if i == MAX { return }
 
-                do spawntask {
-                    debug!("connecting");
-                    let mut stream = TcpStream::connect(addr);
-                    // Connect again before writing
-                    connect(i + 1, addr);
-                    debug!("writing");
-                    stream.write([i as u8]);
-                }
+            do spawn {
+                debug!("connecting");
+                let mut stream = TcpStream::connect(addr);
+                // Connect again before writing
+                connect(i + 1, addr);
+                debug!("writing");
+                stream.write([i as u8]);
             }
         }
     }
 
     #[test]
     fn multiple_connect_interleaved_greedy_schedule_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            static MAX: int = 10;
-            let (port, chan) = Chan::new();
+        let addr = next_test_ip6();
+        static MAX: int = 10;
+        let (port, chan) = oneshot();
 
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                for (i, stream) in acceptor.incoming().enumerate().take(MAX as uint) {
-                    // Start another task to handle the connection
-                    do spawntask {
-                        let mut stream = stream;
-                        let mut buf = [0];
-                        stream.read(buf);
-                        assert!(buf[0] == i as u8);
-                        debug!("read");
-                    }
+        do spawn {
+            let mut acceptor = TcpListener::bind(addr).listen();
+            for (i, stream) in acceptor.incoming().enumerate().take(MAX as uint) {
+                let stream = Cell::new(stream);
+                // Start another task to handle the connection
+                do spawn {
+                    let mut stream = stream.take();
+                    let mut buf = [0];
+                    stream.read(buf);
+                    assert!(buf[0] == i as u8);
+                    debug!("read");
                 }
             }
+        }
 
-            port.recv();
-            connect(0, addr);
+        port.recv();
+        connect(0, addr);
 
-            fn connect(i: int, addr: SocketAddr) {
-                if i == MAX { return }
+        fn connect(i: int, addr: SocketAddr) {
+            if i == MAX { return }
 
-                do spawntask {
-                    debug!("connecting");
-                    let mut stream = TcpStream::connect(addr);
-                    // Connect again before writing
-                    connect(i + 1, addr);
-                    debug!("writing");
-                    stream.write([i as u8]);
-                }
+            do spawn {
+                debug!("connecting");
+                let mut stream = TcpStream::connect(addr);
+                // Connect again before writing
+                connect(i + 1, addr);
+                debug!("writing");
+                stream.write([i as u8]);
             }
         }
     }
 
     #[test]
     fn multiple_connect_interleaved_lazy_schedule_ip4() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip4();
-            static MAX: int = 10;
-            let (port, chan) = Chan::new();
+        let addr = next_test_ip4();
+        static MAX: int = 10;
+        let (port, chan) = oneshot();
 
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                for stream in acceptor.incoming().take(MAX as uint) {
-                    // Start another task to handle the connection
-                    do spawntask_later {
-                        let mut stream = stream;
-                        let mut buf = [0];
-                        stream.read(buf);
-                        assert!(buf[0] == 99);
-                        debug!("read");
-                    }
+        do spawn {
+            let mut acceptor = TcpListener::bind(addr).listen();
+            chan.send(());
+            for stream in acceptor.incoming().take(MAX as uint) {
+                let stream = Cell::new(stream);
+                // Start another task to handle the connection
+                do spawn {
+                    let mut stream = stream.take();
+                    let mut buf = [0];
+                    stream.read(buf);
+                    assert!(buf[0] == 99);
+                    debug!("read");
                 }
             }
+        }
 
-            port.recv();
-            connect(0, addr);
+        port.recv();
+        connect(0, addr);
 
-            fn connect(i: int, addr: SocketAddr) {
-                if i == MAX { return }
+        fn connect(i: int, addr: SocketAddr) {
+            if i == MAX { return }
 
-                do spawntask_later {
-                    debug!("connecting");
-                    let mut stream = TcpStream::connect(addr);
-                    // Connect again before writing
-                    connect(i + 1, addr);
-                    debug!("writing");
-                    stream.write([99]);
-                }
+            do spawn {
+                debug!("connecting");
+                let mut stream = TcpStream::connect(addr);
+                // Connect again before writing
+                connect(i + 1, addr);
+                debug!("writing");
+                stream.write([99]);
             }
         }
     }
     #[test]
     fn multiple_connect_interleaved_lazy_schedule_ip6() {
-        do run_in_mt_newsched_task {
-            let addr = next_test_ip6();
-            static MAX: int = 10;
-            let (port, chan) = Chan::new();
+        let addr = next_test_ip6();
+        static MAX: int = 10;
+        let (port, chan) = oneshot();
 
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-                for stream in acceptor.incoming().take(MAX as uint) {
-                    // Start another task to handle the connection
-                    do spawntask_later {
-                        let mut stream = stream;
-                        let mut buf = [0];
-                        stream.read(buf);
-                        assert!(buf[0] == 99);
-                        debug!("read");
-                    }
+        do spawn {
+            let mut acceptor = TcpListener::bind(addr).listen();
+            chan.send(());
+            for stream in acceptor.incoming().take(MAX as uint) {
+                let stream = Cell::new(stream);
+                // Start another task to handle the connection
+                do spawn {
+                    let mut stream = stream.take();
+                    let mut buf = [0];
+                    stream.read(buf);
+                    assert!(buf[0] == 99);
+                    debug!("read");
                 }
             }
+        }
 
-            port.recv();
-            connect(0, addr);
+        port.recv();
+        connect(0, addr);
 
-            fn connect(i: int, addr: SocketAddr) {
-                if i == MAX { return }
+        fn connect(i: int, addr: SocketAddr) {
+            if i == MAX { return }
 
-                do spawntask_later {
-                    debug!("connecting");
-                    let mut stream = TcpStream::connect(addr);
-                    // Connect again before writing
-                    connect(i + 1, addr);
-                    debug!("writing");
-                    stream.write([99]);
-                }
+            do spawn {
+                debug!("connecting");
+                let mut stream = TcpStream::connect(addr);
+                // Connect again before writing
+                connect(i + 1, addr);
+                debug!("writing");
+                stream.write([99]);
             }
         }
     }
@@ -631,29 +602,26 @@ mod test {
 
     #[cfg(test)]
     fn peer_name(addr: SocketAddr) {
-        do run_in_mt_newsched_task {
-            let (port, chan) = Chan::new();
+        let (port, chan) = oneshot();
 
-            do spawntask {
-                let mut acceptor = TcpListener::bind(addr).listen();
-                chan.send(());
-
-                acceptor.accept();
-            }
-
-            port.recv();
-            let stream = TcpStream::connect(addr);
-
-            assert!(stream.is_some());
-            let mut stream = stream.unwrap();
-
-            // Make sure peer_name gives us the
-            // address/port of the peer we've
-            // connected to.
-            let peer_name = stream.peer_name();
-            assert!(peer_name.is_some());
-            assert_eq!(addr, peer_name.unwrap());
+        do spawn {
+            let mut acceptor = TcpListener::bind(addr).listen();
+            chan.send(());
+            acceptor.accept();
         }
+
+        port.recv();
+        let stream = TcpStream::connect(addr);
+
+        assert!(stream.is_some());
+        let mut stream = stream.unwrap();
+
+        // Make sure peer_name gives us the
+        // address/port of the peer we've
+        // connected to.
+        let peer_name = stream.peer_name();
+        assert!(peer_name.is_some());
+        assert_eq!(addr, peer_name.unwrap());
     }
 
     #[test]
@@ -668,5 +636,4 @@ mod test {
         //peer_name(next_test_ip6());
         socket_name(next_test_ip6());
     }
-
 }
diff --git a/src/libstd/io/net/udp.rs b/src/libstd/io/net/udp.rs
index 1e56f964bea..0a277ee4347 100644
--- a/src/libstd/io/net/udp.rs
+++ b/src/libstd/io/net/udp.rs
@@ -104,52 +104,31 @@ impl Writer for UdpStream {
 #[cfg(test)]
 mod test {
     use super::*;
-    use rt::test::*;
     use io::net::ip::{Ipv4Addr, SocketAddr};
     use io::*;
     use prelude::*;
 
     #[test]  #[ignore]
     fn bind_error() {
-        do run_in_mt_newsched_task {
-            let mut called = false;
-            io_error::cond.trap(|e| {
-                assert!(e.kind == PermissionDenied);
-                called = true;
-            }).inside(|| {
-                let addr = SocketAddr { ip: Ipv4Addr(0, 0, 0, 0), port: 1 };
-                let socket = UdpSocket::bind(addr);
-                assert!(socket.is_none());
-            });
-            assert!(called);
-        }
+        let mut called = false;
+        io_error::cond.trap(|e| {
+            assert!(e.kind == PermissionDenied);
+            called = true;
+        }).inside(|| {
+            let addr = SocketAddr { ip: Ipv4Addr(0, 0, 0, 0), port: 1 };
+            let socket = UdpSocket::bind(addr);
+            assert!(socket.is_none());
+        });
+        assert!(called);
     }
 
     #[test]
     fn socket_smoke_test_ip4() {
-        do run_in_mt_newsched_task {
-            let server_ip = next_test_ip4();
-            let client_ip = next_test_ip4();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                match UdpSocket::bind(server_ip) {
-                    Some(ref mut server) => {
-                        chan.send(());
-                        let mut buf = [0];
-                        match server.recvfrom(buf) {
-                            Some((nread, src)) => {
-                                assert_eq!(nread, 1);
-                                assert_eq!(buf[0], 99);
-                                assert_eq!(src, client_ip);
-                            }
-                            None => fail!()
-                        }
-                    }
-                    None => fail!()
-                }
-            }
+        let server_ip = next_test_ip4();
+        let client_ip = next_test_ip4();
+        let (port, chan) = oneshot();
 
+        do spawn {
             match UdpSocket::bind(client_ip) {
                 Some(ref mut client) => {
                     port.recv();
@@ -158,33 +137,31 @@ mod test {
                 None => fail!()
             }
         }
+
+        match UdpSocket::bind(server_ip) {
+            Some(ref mut server) => {
+                chan.send(());
+                let mut buf = [0];
+                match server.recvfrom(buf) {
+                    Some((nread, src)) => {
+                        assert_eq!(nread, 1);
+                        assert_eq!(buf[0], 99);
+                        assert_eq!(src, client_ip);
+                    }
+                    None => fail!()
+                }
+            }
+            None => fail!()
+        }
     }
 
     #[test]
     fn socket_smoke_test_ip6() {
-        do run_in_mt_newsched_task {
-            let server_ip = next_test_ip6();
-            let client_ip = next_test_ip6();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                match UdpSocket::bind(server_ip) {
-                    Some(ref mut server) => {
-                        chan.send(());
-                        let mut buf = [0];
-                        match server.recvfrom(buf) {
-                            Some((nread, src)) => {
-                                assert_eq!(nread, 1);
-                                assert_eq!(buf[0], 99);
-                                assert_eq!(src, client_ip);
-                            }
-                            None => fail!()
-                        }
-                    }
-                    None => fail!()
-                }
-            }
+        let server_ip = next_test_ip6();
+        let client_ip = next_test_ip6();
+        let (port, chan) = oneshot();
 
+        do spawn {
             match UdpSocket::bind(client_ip) {
                 Some(ref mut client) => {
                     port.recv();
@@ -193,34 +170,31 @@ mod test {
                 None => fail!()
             }
         }
-    }
 
-    #[test]
-    fn stream_smoke_test_ip4() {
-        do run_in_mt_newsched_task {
-            let server_ip = next_test_ip4();
-            let client_ip = next_test_ip4();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                match UdpSocket::bind(server_ip) {
-                    Some(server) => {
-                        let server = ~server;
-                        let mut stream = server.connect(client_ip);
-                        chan.send(());
-                        let mut buf = [0];
-                        match stream.read(buf) {
-                            Some(nread) => {
-                                assert_eq!(nread, 1);
-                                assert_eq!(buf[0], 99);
-                            }
-                            None => fail!()
-                        }
+        match UdpSocket::bind(server_ip) {
+            Some(ref mut server) => {
+                chan.take().send(());
+                let mut buf = [0];
+                match server.recvfrom(buf) {
+                    Some((nread, src)) => {
+                        assert_eq!(nread, 1);
+                        assert_eq!(buf[0], 99);
+                        assert_eq!(src, client_ip);
                     }
                     None => fail!()
                 }
             }
+            None => fail!()
+        }
+    }
 
+    #[test]
+    fn stream_smoke_test_ip4() {
+        let server_ip = next_test_ip4();
+        let client_ip = next_test_ip4();
+        let (port, chan) = oneshot();
+
+        do spawn {
             match UdpSocket::bind(client_ip) {
                 Some(client) => {
                     let client = ~client;
@@ -231,34 +205,32 @@ mod test {
                 None => fail!()
             }
         }
+
+        match UdpSocket::bind(server_ip) {
+            Some(server) => {
+                let server = ~server;
+                let mut stream = server.connect(client_ip);
+                chan.send(());
+                let mut buf = [0];
+                match stream.read(buf) {
+                    Some(nread) => {
+                        assert_eq!(nread, 1);
+                        assert_eq!(buf[0], 99);
+                    }
+                    None => fail!()
+                }
+            }
+            None => fail!()
+        }
     }
 
     #[test]
     fn stream_smoke_test_ip6() {
-        do run_in_mt_newsched_task {
-            let server_ip = next_test_ip6();
-            let client_ip = next_test_ip6();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                match UdpSocket::bind(server_ip) {
-                    Some(server) => {
-                        let server = ~server;
-                        let mut stream = server.connect(client_ip);
-                        chan.send(());
-                        let mut buf = [0];
-                        match stream.read(buf) {
-                            Some(nread) => {
-                                assert_eq!(nread, 1);
-                                assert_eq!(buf[0], 99);
-                            }
-                            None => fail!()
-                        }
-                    }
-                    None => fail!()
-                }
-            }
+        let server_ip = next_test_ip6();
+        let client_ip = next_test_ip6();
+        let (port, chan) = oneshot();
 
+        do spawn {
             match UdpSocket::bind(client_ip) {
                 Some(client) => {
                     let client = ~client;
@@ -269,25 +241,36 @@ mod test {
                 None => fail!()
             }
         }
+
+        match UdpSocket::bind(server_ip) {
+            Some(server) => {
+                let server = ~server;
+                let mut stream = server.connect(client_ip);
+                chan.send(());
+                let mut buf = [0];
+                match stream.read(buf) {
+                    Some(nread) => {
+                        assert_eq!(nread, 1);
+                        assert_eq!(buf[0], 99);
+                    }
+                    None => fail!()
+                }
+            }
+            None => fail!()
+        }
     }
 
-    #[cfg(test)]
     fn socket_name(addr: SocketAddr) {
-        do run_in_mt_newsched_task {
-            do spawntask {
-                let server = UdpSocket::bind(addr);
+        let server = UdpSocket::bind(addr);
 
-                assert!(server.is_some());
-                let mut server = server.unwrap();
+        assert!(server.is_some());
+        let mut server = server.unwrap();
 
-                // Make sure socket_name gives
-                // us the socket we binded to.
-                let so_name = server.socket_name();
-                assert!(so_name.is_some());
-                assert_eq!(addr, so_name.unwrap());
-
-            }
-        }
+        // Make sure socket_name gives
+        // us the socket we binded to.
+        let so_name = server.socket_name();
+        assert!(so_name.is_some());
+        assert_eq!(addr, so_name.unwrap());
     }
 
     #[test]
diff --git a/src/libstd/io/net/unix.rs b/src/libstd/io/net/unix.rs
index 2766aa9ad27..d8abd1fe50d 100644
--- a/src/libstd/io/net/unix.rs
+++ b/src/libstd/io/net/unix.rs
@@ -150,55 +150,47 @@ impl Acceptor<UnixStream> for UnixAcceptor {
 mod tests {
     use prelude::*;
     use super::*;
-    use rt::test::*;
     use io::*;
 
     fn smalltest(server: proc(UnixStream), client: proc(UnixStream)) {
-        do run_in_mt_newsched_task {
-            let path1 = next_test_unix();
-            let path2 = path1.clone();
-            let (client, server) = (client, server);
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = UnixListener::bind(&path1).listen();
-                chan.send(());
-                server(acceptor.accept().unwrap());
-            }
+        let path1 = next_test_unix();
+        let path2 = path1.clone();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             client(UnixStream::connect(&path2).unwrap());
         }
+
+        let mut acceptor = UnixListener::bind(&path1).listen();
+        chan.send(());
+        server(acceptor.accept().unwrap());
     }
 
     #[test]
     fn bind_error() {
-        do run_in_mt_newsched_task {
-            let mut called = false;
-            io_error::cond.trap(|e| {
-                assert!(e.kind == PermissionDenied);
-                called = true;
-            }).inside(|| {
-                let listener = UnixListener::bind(&("path/to/nowhere"));
-                assert!(listener.is_none());
-            });
-            assert!(called);
-        }
+        let mut called = false;
+        io_error::cond.trap(|e| {
+            assert!(e.kind == PermissionDenied);
+            called = true;
+        }).inside(|| {
+            let listener = UnixListener::bind(&("path/to/nowhere"));
+            assert!(listener.is_none());
+        });
+        assert!(called);
     }
 
     #[test]
     fn connect_error() {
-        do run_in_mt_newsched_task {
-            let mut called = false;
-            io_error::cond.trap(|e| {
-                assert_eq!(e.kind, FileNotFound);
-                called = true;
-            }).inside(|| {
-                let stream = UnixStream::connect(&("path/to/nowhere"));
-                assert!(stream.is_none());
-            });
-            assert!(called);
-        }
+        let mut called = false;
+        io_error::cond.trap(|e| {
+            assert_eq!(e.kind, OtherIoError);
+            called = true;
+        }).inside(|| {
+            let stream = UnixStream::connect(&("path/to/nowhere"));
+            assert!(stream.is_none());
+        });
+        assert!(called);
     }
 
     #[test]
@@ -244,37 +236,33 @@ mod tests {
 
     #[test]
     fn accept_lots() {
-        do run_in_mt_newsched_task {
-            let times = 10;
-            let path1 = next_test_unix();
-            let path2 = path1.clone();
-            let (port, chan) = Chan::new();
-
-            do spawntask {
-                let mut acceptor = UnixListener::bind(&path1).listen();
-                chan.send(());
-                times.times(|| {
-                    let mut client = acceptor.accept();
-                    let mut buf = [0];
-                    client.read(buf);
-                    assert_eq!(buf[0], 100);
-                })
-            }
+        let times = 10;
+        let path1 = next_test_unix();
+        let path2 = path1.clone();
+        let (port, chan) = oneshot();
 
+        do spawn {
             port.recv();
             times.times(|| {
                 let mut stream = UnixStream::connect(&path2);
                 stream.write([100]);
             })
         }
+
+        let mut acceptor = UnixListener::bind(&path1).listen();
+        chan.send(());
+        times.times(|| {
+            let mut client = acceptor.accept();
+            let mut buf = [0];
+            client.read(buf);
+            assert_eq!(buf[0], 100);
+        })
     }
 
     #[test]
     fn path_exists() {
-        do run_in_mt_newsched_task {
-            let path = next_test_unix();
-            let _acceptor = UnixListener::bind(&path).listen();
-            assert!(path.exists());
-        }
+        let path = next_test_unix();
+        let _acceptor = UnixListener::bind(&path).listen();
+        assert!(path.exists());
     }
 }
diff --git a/src/libstd/io/option.rs b/src/libstd/io/option.rs
index 61c5411f360..a661d6ab7eb 100644
--- a/src/libstd/io/option.rs
+++ b/src/libstd/io/option.rs
@@ -106,53 +106,46 @@ impl<T, A: Acceptor<T>> Acceptor<T> for Option<A> {
 mod test {
     use option::*;
     use super::super::mem::*;
-    use rt::test::*;
     use super::super::{PreviousIoError, io_error};
 
     #[test]
     fn test_option_writer() {
-        do run_in_mt_newsched_task {
-            let mut writer: Option<MemWriter> = Some(MemWriter::new());
-            writer.write([0, 1, 2]);
-            writer.flush();
-            assert_eq!(writer.unwrap().inner(), ~[0, 1, 2]);
-        }
+        let mut writer: Option<MemWriter> = Some(MemWriter::new());
+        writer.write([0, 1, 2]);
+        writer.flush();
+        assert_eq!(writer.unwrap().inner(), ~[0, 1, 2]);
     }
 
     #[test]
     fn test_option_writer_error() {
-        do run_in_mt_newsched_task {
-            let mut writer: Option<MemWriter> = None;
+        let mut writer: Option<MemWriter> = None;
 
-            let mut called = false;
-            io_error::cond.trap(|err| {
-                assert_eq!(err.kind, PreviousIoError);
-                called = true;
-            }).inside(|| {
-                writer.write([0, 0, 0]);
-            });
-            assert!(called);
+        let mut called = false;
+        io_error::cond.trap(|err| {
+            assert_eq!(err.kind, PreviousIoError);
+            called = true;
+        }).inside(|| {
+            writer.write([0, 0, 0]);
+        });
+        assert!(called);
 
-            let mut called = false;
-            io_error::cond.trap(|err| {
-                assert_eq!(err.kind, PreviousIoError);
-                called = true;
-            }).inside(|| {
-                writer.flush();
-            });
-            assert!(called);
-        }
+        let mut called = false;
+        io_error::cond.trap(|err| {
+            assert_eq!(err.kind, PreviousIoError);
+            called = true;
+        }).inside(|| {
+            writer.flush();
+        });
+        assert!(called);
     }
 
     #[test]
     fn test_option_reader() {
-        do run_in_mt_newsched_task {
-            let mut reader: Option<MemReader> = Some(MemReader::new(~[0, 1, 2, 3]));
-            let mut buf = [0, 0];
-            reader.read(buf);
-            assert_eq!(buf, [0, 1]);
-            assert!(!reader.eof());
-        }
+        let mut reader: Option<MemReader> = Some(MemReader::new(~[0, 1, 2, 3]));
+        let mut buf = [0, 0];
+        reader.read(buf);
+        assert_eq!(buf, [0, 1]);
+        assert!(!reader.eof());
     }
 
     #[test]
diff --git a/src/libstd/io/test.rs b/src/libstd/io/test.rs
new file mode 100644
index 00000000000..212e4ebffa8
--- /dev/null
+++ b/src/libstd/io/test.rs
@@ -0,0 +1,79 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+/// Get a port number, starting at 9600, for use in tests
+pub fn next_test_port() -> u16 {
+    use unstable::atomics::{AtomicUint, INIT_ATOMIC_UINT, Relaxed};
+    static mut next_offset: AtomicUint = INIT_ATOMIC_UINT;
+    unsafe {
+        base_port() + next_offset.fetch_add(1, Relaxed) as u16
+    }
+}
+
+/// Get a temporary path which could be the location of a unix socket
+pub fn next_test_unix() -> Path {
+    if cfg!(unix) {
+        os::tmpdir().join(rand::task_rng().gen_ascii_str(20))
+    } else {
+        Path::new(r"\\.\pipe\" + rand::task_rng().gen_ascii_str(20))
+    }
+}
+
+/// Get a unique IPv4 localhost:port pair starting at 9600
+pub fn next_test_ip4() -> SocketAddr {
+    SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: next_test_port() }
+}
+
+/// Get a unique IPv6 localhost:port pair starting at 9600
+pub fn next_test_ip6() -> SocketAddr {
+    SocketAddr { ip: Ipv6Addr(0, 0, 0, 0, 0, 0, 0, 1), port: next_test_port() }
+}
+
+/*
+XXX: Welcome to MegaHack City.
+
+The bots run multiple builds at the same time, and these builds
+all want to use ports. This function figures out which workspace
+it is running in and assigns a port range based on it.
+*/
+fn base_port() -> u16 {
+    use os;
+    use str::StrSlice;
+    use vec::ImmutableVector;
+
+    let base = 9600u16;
+    let range = 1000u16;
+
+    let bases = [
+        ("32-opt", base + range * 1),
+        ("32-noopt", base + range * 2),
+        ("64-opt", base + range * 3),
+        ("64-noopt", base + range * 4),
+        ("64-opt-vg", base + range * 5),
+        ("all-opt", base + range * 6),
+        ("snap3", base + range * 7),
+        ("dist", base + range * 8)
+    ];
+
+    // FIXME (#9639): This needs to handle non-utf8 paths
+    let path = os::getcwd();
+    let path_s = path.as_str().unwrap();
+
+    let mut final_base = base;
+
+    for &(dir, base) in bases.iter() {
+        if path_s.contains(dir) {
+            final_base = base;
+            break;
+        }
+    }
+
+    return final_base;
+}
diff --git a/src/libstd/io/timer.rs b/src/libstd/io/timer.rs
index 9d4a72509e7..c86e1a1890b 100644
--- a/src/libstd/io/timer.rs
+++ b/src/libstd/io/timer.rs
@@ -108,77 +108,60 @@ impl Timer {
 mod test {
     use prelude::*;
     use super::*;
-    use rt::test::*;
 
     #[test]
     fn test_io_timer_sleep_simple() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            timer.sleep(1);
-        }
+        let mut timer = Timer::new().unwrap();
+        timer.sleep(1);
     }
 
     #[test]
     fn test_io_timer_sleep_oneshot() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            timer.oneshot(1).recv();
-        }
+        let mut timer = Timer::new().unwrap();
+        timer.oneshot(1).recv();
     }
 
     #[test]
     fn test_io_timer_sleep_oneshot_forget() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            timer.oneshot(100000000000);
-        }
+        let mut timer = Timer::new().unwrap();
+        timer.oneshot(100000000000);
     }
 
     #[test]
     fn oneshot_twice() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            let port1 = timer.oneshot(10000);
-            let port = timer.oneshot(1);
-            port.recv();
-            assert_eq!(port1.try_recv(), None);
-        }
+        let mut timer = Timer::new().unwrap();
+        let port1 = timer.oneshot(10000);
+        let port = timer.oneshot(1);
+        port.recv();
+        assert_eq!(port1.try_recv(), None);
     }
 
     #[test]
     fn test_io_timer_oneshot_then_sleep() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            let port = timer.oneshot(100000000000);
-            timer.sleep(1); // this should invalidate the port
+        let mut timer = Timer::new().unwrap();
+        let port = timer.oneshot(100000000000);
+        timer.sleep(1); // this should invalidate the port
 
-            assert_eq!(port.try_recv(), None);
-        }
+        assert_eq!(port.try_recv(), None);
     }
 
     #[test]
     fn test_io_timer_sleep_periodic() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            let port = timer.periodic(1);
-            port.recv();
-            port.recv();
-            port.recv();
-        }
+        let mut timer = Timer::new().unwrap();
+        let port = timer.periodic(1);
+        port.recv();
+        port.recv();
+        port.recv();
     }
 
     #[test]
     fn test_io_timer_sleep_periodic_forget() {
-        do run_in_mt_newsched_task {
-            let mut timer = Timer::new().unwrap();
-            timer.periodic(100000000000);
-        }
+        let mut timer = Timer::new().unwrap();
+        timer.periodic(100000000000);
     }
 
     #[test]
     fn test_io_timer_sleep_standalone() {
-        do run_in_mt_newsched_task {
-            sleep(1)
-        }
+        sleep(1)
     }
 }
diff --git a/src/libstd/rt/test.rs b/src/libstd/rt/test.rs
deleted file mode 100644
index 2b48b396c99..00000000000
--- a/src/libstd/rt/test.rs
+++ /dev/null
@@ -1,440 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use io::net::ip::{SocketAddr, Ipv4Addr, Ipv6Addr};
-
-use clone::Clone;
-use container::Container;
-use iter::{Iterator, range};
-use option::{Some, None};
-use os;
-use path::GenericPath;
-use path::Path;
-use rand::Rng;
-use rand;
-use result::{Result, Ok, Err};
-use rt::basic;
-use rt::deque::BufferPool;
-use comm::Chan;
-use rt::new_event_loop;
-use rt::sched::Scheduler;
-use rt::sleeper_list::SleeperList;
-use rt::task::Task;
-use rt::thread::Thread;
-use task::TaskResult;
-use unstable::{run_in_bare_thread};
-use vec;
-use vec::{OwnedVector, MutableVector, ImmutableVector};
-
-pub fn new_test_uv_sched() -> Scheduler {
-
-    let mut pool = BufferPool::new();
-    let (worker, stealer) = pool.deque();
-
-    let mut sched = Scheduler::new(new_event_loop(),
-                                   worker,
-                                   ~[stealer],
-                                   SleeperList::new());
-
-    // Don't wait for the Shutdown message
-    sched.no_sleep = true;
-    return sched;
-
-}
-
-pub fn new_test_sched() -> Scheduler {
-    let mut pool = BufferPool::new();
-    let (worker, stealer) = pool.deque();
-
-    let mut sched = Scheduler::new(basic::event_loop(),
-                                   worker,
-                                   ~[stealer],
-                                   SleeperList::new());
-
-    // Don't wait for the Shutdown message
-    sched.no_sleep = true;
-    return sched;
-}
-
-pub fn run_in_uv_task(f: proc()) {
-    do run_in_bare_thread {
-        run_in_uv_task_core(f);
-    }
-}
-
-pub fn run_in_newsched_task(f: proc()) {
-    do run_in_bare_thread {
-        run_in_newsched_task_core(f);
-    }
-}
-
-pub fn run_in_uv_task_core(f: proc()) {
-
-    use rt::sched::Shutdown;
-
-    let mut sched = ~new_test_uv_sched();
-    let exit_handle = sched.make_handle();
-
-    let on_exit: proc(TaskResult) = proc(exit_status: TaskResult) {
-        let mut exit_handle = exit_handle;
-        exit_handle.send(Shutdown);
-        rtassert!(exit_status.is_ok());
-    };
-    let mut task = ~Task::new_root(&mut sched.stack_pool, None, f);
-    task.death.on_exit = Some(on_exit);
-
-    sched.bootstrap(task);
-}
-
-pub fn run_in_newsched_task_core(f: proc()) {
-    use rt::sched::Shutdown;
-
-    let mut sched = ~new_test_sched();
-    let exit_handle = sched.make_handle();
-
-    let on_exit: proc(TaskResult) = proc(exit_status: TaskResult) {
-        let mut exit_handle = exit_handle;
-        exit_handle.send(Shutdown);
-        rtassert!(exit_status.is_ok());
-    };
-    let mut task = ~Task::new_root(&mut sched.stack_pool, None, f);
-    task.death.on_exit = Some(on_exit);
-
-    sched.bootstrap(task);
-}
-
-#[cfg(target_os="macos")]
-#[allow(non_camel_case_types)]
-mod darwin_fd_limit {
-    /*!
-     * darwin_fd_limit exists to work around an issue where launchctl on Mac OS X defaults the
-     * rlimit maxfiles to 256/unlimited. The default soft limit of 256 ends up being far too low
-     * for our multithreaded scheduler testing, depending on the number of cores available.
-     *
-     * This fixes issue #7772.
-     */
-
-    use libc;
-    type rlim_t = libc::uint64_t;
-    struct rlimit {
-        rlim_cur: rlim_t,
-        rlim_max: rlim_t
-    }
-    #[nolink]
-    extern {
-        // name probably doesn't need to be mut, but the C function doesn't specify const
-        fn sysctl(name: *mut libc::c_int, namelen: libc::c_uint,
-                  oldp: *mut libc::c_void, oldlenp: *mut libc::size_t,
-                  newp: *mut libc::c_void, newlen: libc::size_t) -> libc::c_int;
-        fn getrlimit(resource: libc::c_int, rlp: *mut rlimit) -> libc::c_int;
-        fn setrlimit(resource: libc::c_int, rlp: *rlimit) -> libc::c_int;
-    }
-    static CTL_KERN: libc::c_int = 1;
-    static KERN_MAXFILESPERPROC: libc::c_int = 29;
-    static RLIMIT_NOFILE: libc::c_int = 8;
-
-    pub unsafe fn raise_fd_limit() {
-        // The strategy here is to fetch the current resource limits, read the kern.maxfilesperproc
-        // sysctl value, and bump the soft resource limit for maxfiles up to the sysctl value.
-        use ptr::{to_unsafe_ptr, to_mut_unsafe_ptr, mut_null};
-        use mem::size_of_val;
-        use os::last_os_error;
-
-        // Fetch the kern.maxfilesperproc value
-        let mut mib: [libc::c_int, ..2] = [CTL_KERN, KERN_MAXFILESPERPROC];
-        let mut maxfiles: libc::c_int = 0;
-        let mut size: libc::size_t = size_of_val(&maxfiles) as libc::size_t;
-        if sysctl(to_mut_unsafe_ptr(&mut mib[0]), 2,
-                  to_mut_unsafe_ptr(&mut maxfiles) as *mut libc::c_void,
-                  to_mut_unsafe_ptr(&mut size),
-                  mut_null(), 0) != 0 {
-            let err = last_os_error();
-            error!("raise_fd_limit: error calling sysctl: {}", err);
-            return;
-        }
-
-        // Fetch the current resource limits
-        let mut rlim = rlimit{rlim_cur: 0, rlim_max: 0};
-        if getrlimit(RLIMIT_NOFILE, to_mut_unsafe_ptr(&mut rlim)) != 0 {
-            let err = last_os_error();
-            error!("raise_fd_limit: error calling getrlimit: {}", err);
-            return;
-        }
-
-        // Bump the soft limit to the smaller of kern.maxfilesperproc and the hard limit
-        rlim.rlim_cur = ::cmp::min(maxfiles as rlim_t, rlim.rlim_max);
-
-        // Set our newly-increased resource limit
-        if setrlimit(RLIMIT_NOFILE, to_unsafe_ptr(&rlim)) != 0 {
-            let err = last_os_error();
-            error!("raise_fd_limit: error calling setrlimit: {}", err);
-            return;
-        }
-    }
-}
-
-#[cfg(not(target_os="macos"))]
-mod darwin_fd_limit {
-    pub unsafe fn raise_fd_limit() {}
-}
-
-#[doc(hidden)]
-pub fn prepare_for_lots_of_tests() {
-    // Bump the fd limit on OS X. See darwin_fd_limit for an explanation.
-    unsafe { darwin_fd_limit::raise_fd_limit() }
-}
-
-/// Create more than one scheduler and run a function in a task
-/// in one of the schedulers. The schedulers will stay alive
-/// until the function `f` returns.
-pub fn run_in_mt_newsched_task(f: proc()) {
-    use os;
-    use from_str::FromStr;
-    use rt::sched::Shutdown;
-    use rt::util;
-
-    // see comment in other function (raising fd limits)
-    prepare_for_lots_of_tests();
-
-    do run_in_bare_thread {
-        let nthreads = match os::getenv("RUST_RT_TEST_THREADS") {
-            Some(nstr) => FromStr::from_str(nstr).unwrap(),
-            None => {
-                if util::limit_thread_creation_due_to_osx_and_valgrind() {
-                    1
-                } else {
-                    // Using more threads than cores in test code
-                    // to force the OS to preempt them frequently.
-                    // Assuming that this help stress test concurrent types.
-                    util::num_cpus() * 2
-                }
-            }
-        };
-
-        let sleepers = SleeperList::new();
-
-        let mut handles = ~[];
-        let mut scheds = ~[];
-
-        let mut pool = BufferPool::<~Task>::new();
-        let workers = range(0, nthreads).map(|_| pool.deque());
-        let (workers, stealers) = vec::unzip(workers);
-
-        for worker in workers.move_iter() {
-            let loop_ = new_event_loop();
-            let mut sched = ~Scheduler::new(loop_,
-                                            worker,
-                                            stealers.clone(),
-                                            sleepers.clone());
-            let handle = sched.make_handle();
-
-            handles.push(handle);
-            scheds.push(sched);
-        }
-
-        let handles = handles;  // Work around not being able to capture mut
-        let on_exit: proc(TaskResult) = proc(exit_status: TaskResult) {
-            // Tell schedulers to exit
-            let mut handles = handles;
-            for handle in handles.mut_iter() {
-                handle.send(Shutdown);
-            }
-
-            rtassert!(exit_status.is_ok());
-        };
-        let mut main_task = ~Task::new_root(&mut scheds[0].stack_pool,
-                                            None,
-                                            f);
-        main_task.death.on_exit = Some(on_exit);
-
-        let mut threads = ~[];
-
-        let main_thread = {
-            let sched = scheds.pop();
-            let main_task = main_task;
-            do Thread::start {
-                sched.bootstrap(main_task);
-            }
-        };
-        threads.push(main_thread);
-
-        while !scheds.is_empty() {
-            let mut sched = scheds.pop();
-            let bootstrap_task = ~do Task::new_root(&mut sched.stack_pool, None) || {
-                rtdebug!("bootstrapping non-primary scheduler");
-            };
-            let sched = sched;
-            let thread = do Thread::start {
-                sched.bootstrap(bootstrap_task);
-            };
-
-            threads.push(thread);
-        }
-
-        // Wait for schedulers
-        for thread in threads.move_iter() {
-            thread.join();
-        }
-    }
-
-}
-
-/// Test tasks will abort on failure instead of unwinding
-pub fn spawntask(f: proc()) {
-    Scheduler::run_task(Task::build_child(None, f));
-}
-
-/// Create a new task and run it right now. Aborts on failure
-pub fn spawntask_later(f: proc()) {
-    Scheduler::run_task_later(Task::build_child(None, f));
-}
-
-pub fn spawntask_random(f: proc()) {
-    use rand::{Rand, rng};
-
-    let mut rng = rng();
-    let run_now: bool = Rand::rand(&mut rng);
-
-    if run_now {
-        spawntask(f)
-    } else {
-        spawntask_later(f)
-    }
-}
-
-pub fn spawntask_try(f: proc()) -> Result<(),()> {
-
-    let (port, chan) = Chan::new();
-    let on_exit: proc(TaskResult) = proc(exit_status) {
-        chan.send(exit_status)
-    };
-
-    let mut new_task = Task::build_root(None, f);
-    new_task.death.on_exit = Some(on_exit);
-
-    Scheduler::run_task(new_task);
-
-    let exit_status = port.recv();
-    if exit_status.is_ok() { Ok(()) } else { Err(()) }
-
-}
-
-/// Spawn a new task in a new scheduler and return a thread handle.
-pub fn spawntask_thread(f: proc()) -> Thread<()> {
-    let thread = do Thread::start {
-        run_in_newsched_task_core(f);
-    };
-
-    return thread;
-}
-
-/// Get a ~Task for testing purposes other than actually scheduling it.
-pub fn with_test_task(blk: proc(~Task) -> ~Task) {
-    do run_in_bare_thread {
-        let mut sched = ~new_test_sched();
-        let task = blk(~Task::new_root(&mut sched.stack_pool,
-                                       None,
-                                       proc() {}));
-        cleanup_task(task);
-    }
-}
-
-/// Use to cleanup tasks created for testing but not "run".
-pub fn cleanup_task(mut task: ~Task) {
-    task.destroyed = true;
-}
-
-/// Get a port number, starting at 9600, for use in tests
-pub fn next_test_port() -> u16 {
-    use unstable::mutex::{Mutex, MUTEX_INIT};
-    static mut lock: Mutex = MUTEX_INIT;
-    static mut next_offset: u16 = 0;
-    unsafe {
-        let base = base_port();
-        lock.lock();
-        let ret = base + next_offset;
-        next_offset += 1;
-        lock.unlock();
-        return ret;
-    }
-}
-
-/// Get a temporary path which could be the location of a unix socket
-pub fn next_test_unix() -> Path {
-    if cfg!(unix) {
-        os::tmpdir().join(rand::task_rng().gen_ascii_str(20))
-    } else {
-        Path::new(r"\\.\pipe\" + rand::task_rng().gen_ascii_str(20))
-    }
-}
-
-/// Get a unique IPv4 localhost:port pair starting at 9600
-pub fn next_test_ip4() -> SocketAddr {
-    SocketAddr { ip: Ipv4Addr(127, 0, 0, 1), port: next_test_port() }
-}
-
-/// Get a unique IPv6 localhost:port pair starting at 9600
-pub fn next_test_ip6() -> SocketAddr {
-    SocketAddr { ip: Ipv6Addr(0, 0, 0, 0, 0, 0, 0, 1), port: next_test_port() }
-}
-
-/*
-XXX: Welcome to MegaHack City.
-
-The bots run multiple builds at the same time, and these builds
-all want to use ports. This function figures out which workspace
-it is running in and assigns a port range based on it.
-*/
-fn base_port() -> u16 {
-    use os;
-    use str::StrSlice;
-    use vec::ImmutableVector;
-
-    let base = 9600u16;
-    let range = 1000u16;
-
-    let bases = [
-        ("32-opt", base + range * 1),
-        ("32-noopt", base + range * 2),
-        ("64-opt", base + range * 3),
-        ("64-noopt", base + range * 4),
-        ("64-opt-vg", base + range * 5),
-        ("all-opt", base + range * 6),
-        ("snap3", base + range * 7),
-        ("dist", base + range * 8)
-    ];
-
-    // FIXME (#9639): This needs to handle non-utf8 paths
-    let path = os::getcwd();
-    let path_s = path.as_str().unwrap();
-
-    let mut final_base = base;
-
-    for &(dir, base) in bases.iter() {
-        if path_s.contains(dir) {
-            final_base = base;
-            break;
-        }
-    }
-
-    return final_base;
-}
-
-/// Get a constant that represents the number of times to repeat
-/// stress tests. Default 1.
-pub fn stress_factor() -> uint {
-    use os::getenv;
-    use from_str::from_str;
-
-    match getenv("RUST_RT_STRESS") {
-        Some(val) => from_str::<uint>(val).unwrap(),
-        None => 1
-    }
-}