auto merge of rust-lang#7883 : brson/rust/rm-std-net, r=graydon

This removes all the code from libextra that depends on libuv. After that it removes three runtime features that existed to support the global uv loop: weak tasks, runtime-global variables, and at_exit handlers.

The networking code doesn't have many users besides servo, so shouldn't have much fallout. The timer code though is useful and will probably break out-of-tree code until the new scheduler lands, but I expect that to be soon.

It also incidentally moves `os::change_dir_locked` to `std::unstable`. This is a function used by test cases to avoid cwd races and in my opinion shouldn't be public (rust-lang#7870).

Closes rust-lang#7251 and rust-lang#7870

src/libextra/extra.rs

@@ -36,23 +36,9 @@ use std::str::{StrSlice, OwnedStr};
 
 pub use std::os;
 
-pub mod uv_ll;
-
-// General io and system-services modules
-
-#[path = "net/mod.rs"]
-pub mod net;
-
-// libuv modules
-pub mod uv;
-pub mod uv_iotask;
-pub mod uv_global_loop;
-
-
 // Utility modules
 
 pub mod c_vec;
-pub mod timer;
 pub mod io_util;
 pub mod rc;
 
@@ -90,6 +76,7 @@ pub mod sha2;
 
 // And ... other stuff
 
+pub mod url;
 pub mod ebml;
 pub mod dbg;
 pub mod getopts;

src/libextra/flatpipes.rs

@@ -639,7 +639,6 @@ mod test {
     use flatpipes::serial;
     use io_util::BufReader;
     use flatpipes::{BytePort, FlatChan, FlatPort};
-    use net::tcp::TcpSocketBuf;
 
     use std::comm;
     use std::int;
@@ -728,7 +727,8 @@ mod test {
     }
 
     // FIXME #2064: Networking doesn't work on x86
-    #[test]
+    // XXX Broken until networking support is added back
+    /*#[test]
     #[cfg(target_arch = "x86_64")]
     fn test_pod_tcp_stream() {
         fn reader_port(buf: TcpSocketBuf
@@ -745,6 +745,7 @@ mod test {
     #[test]
     #[cfg(target_arch = "x86_64")]
     fn test_serializing_tcp_stream() {
+        // XXX Broken until networking support is added back
         fn reader_port(buf: TcpSocketBuf
                       ) -> serial::ReaderPort<int, TcpSocketBuf> {
             serial::reader_port(buf)
@@ -860,7 +861,7 @@ mod test {
         }
 
         finish_port.recv();
-    }
+    }*/
 
     // Tests that the different backends behave the same when the
     // binary streaming protocol is broken