Runtime removal: refactor timer

This patch continues runtime removal by moving out timer-related code
into `sys`.

Because this eliminates APIs in `libnative` and `librustrt`, it is a:

[breaking-change]

This functionality is likely to be available publicly, in some form,
from `std` in the future.

6 files changed, 60 insertions, 83 deletions

diff --git a/src/libnative/io/mod.rs b/src/libnative/io/mod.rs
index 29370dee88b..5d6d23f5f03 100644
--- a/src/libnative/io/mod.rs
+++ b/src/libnative/io/mod.rs
@@ -29,19 +29,6 @@ use std::os;
 use std::rt::rtio::{mod, IoResult, IoError};
 use std::num;
 
-#[cfg(any(target_os = "macos",
-          target_os = "ios",
-          target_os = "freebsd",
-          target_os = "dragonfly",
-          target_os = "android",
-          target_os = "linux"))]
-#[path = "timer_unix.rs"]
-pub mod timer;
-
-#[cfg(target_os = "windows")]
-#[path = "timer_windows.rs"]
-pub mod timer;
-
 #[cfg(windows)]
 #[path = "tty_windows.rs"]
 mod tty;
@@ -112,10 +99,6 @@ impl IoFactory {
 }
 
 impl rtio::IoFactory for IoFactory {
-    // misc
-    fn timer_init(&mut self) -> IoResult<Box<rtio::RtioTimer + Send>> {
-        timer::Timer::new().map(|t| box t as Box<rtio::RtioTimer + Send>)
-    }
     #[cfg(unix)]
     fn tty_open(&mut self, fd: c_int, _readable: bool)
                 -> IoResult<Box<rtio::RtioTTY + Send>> {
diff --git a/src/libstd/io/timer.rs b/src/libstd/io/timer.rs
index d16199da77f..ec588f13478 100644
--- a/src/libstd/io/timer.rs
+++ b/src/libstd/io/timer.rs
@@ -21,10 +21,9 @@ and create receivers which will receive notifications after a period of time.
 
 use comm::{Receiver, Sender, channel};
 use time::Duration;
-use io::{IoResult, IoError};
-use kinds::Send;
-use boxed::Box;
-use rt::rtio::{IoFactory, LocalIo, RtioTimer, Callback};
+use io::IoResult;
+use sys::timer::Callback;
+use sys::timer::Timer as TimerImp;
 
 /// A synchronous timer object
 ///
@@ -69,7 +68,7 @@ use rt::rtio::{IoFactory, LocalIo, RtioTimer, Callback};
 /// # }
 /// ```
 pub struct Timer {
-    obj: Box<RtioTimer + Send>,
+    inner: TimerImp,
 }
 
 struct TimerCallback { tx: Sender<()> }
@@ -90,9 +89,7 @@ impl Timer {
     /// for a number of milliseconds, or to possibly create channels which will
     /// get notified after an amount of time has passed.
     pub fn new() -> IoResult<Timer> {
-        LocalIo::maybe_raise(|io| {
-            io.timer_init().map(|t| Timer { obj: t })
-        }).map_err(IoError::from_rtio_error)
+        TimerImp::new().map(|t| Timer { inner: t })
     }
 
     /// Blocks the current task for the specified duration.
@@ -106,7 +103,7 @@ impl Timer {
         // Short-circuit the timer backend for 0 duration
         let ms = in_ms_u64(duration);
         if ms == 0 { return }
-        self.obj.sleep(ms);
+        self.inner.sleep(ms);
     }
 
     /// Creates a oneshot receiver which will have a notification sent when
@@ -152,7 +149,7 @@ impl Timer {
         let (tx, rx) = channel();
         // Short-circuit the timer backend for 0 duration
         if in_ms_u64(duration) != 0 {
-            self.obj.oneshot(in_ms_u64(duration), box TimerCallback { tx: tx });
+            self.inner.oneshot(in_ms_u64(duration), box TimerCallback { tx: tx });
         } else {
             tx.send(());
         }
@@ -213,7 +210,7 @@ impl Timer {
         // not clear what use a 0ms period is anyway...
         let ms = if ms == 0 { 1 } else { ms };
         let (tx, rx) = channel();
-        self.obj.period(ms, box TimerCallback { tx: tx });
+        self.inner.period(ms, box TimerCallback { tx: tx });
         return rx
     }
 }
diff --git a/src/libstd/sys/unix/mod.rs b/src/libstd/sys/unix/mod.rs
index b404dc7fdbd..03a4e56f00d 100644
--- a/src/libstd/sys/unix/mod.rs
+++ b/src/libstd/sys/unix/mod.rs
@@ -34,6 +34,7 @@ pub mod udp;
 pub mod pipe;
 pub mod helper_signal;
 pub mod process;
+pub mod timer;
 
 pub mod addrinfo {
     pub use sys_common::net::get_host_addresses;
diff --git a/src/libnative/io/timer_unix.rs b/src/libstd/sys/unix/timer.rs
index c26e2e76cee..a1e6ac3db7e 100644
--- a/src/libnative/io/timer_unix.rs
+++ b/src/libstd/sys/unix/timer.rs
@@ -47,27 +47,30 @@
 //! Note that all time units in this file are in *milliseconds*.
 
 use libc;
-use std::mem;
-use std::os;
-use std::ptr;
-use std::rt::rtio;
-use std::rt::rtio::IoResult;
-use std::sync::atomic;
-use std::comm;
-
-use io::c;
-use platform_imp::fs::FileDesc;
-use io::helper_thread::Helper;
+use mem;
+use os;
+use ptr;
+use sync::atomic;
+use comm;
+use sys::c;
+use sys::fs::FileDesc;
+use sys_common::helper_thread::Helper;
+use prelude::*;
+use io::IoResult;
 
 helper_init!(static HELPER: Helper<Req>)
 
+pub trait Callback {
+    fn call(&mut self);
+}
+
 pub struct Timer {
     id: uint,
     inner: Option<Box<Inner>>,
 }
 
 pub struct Inner {
-    cb: Option<Box<rtio::Callback + Send>>,
+    cb: Option<Box<Callback + Send>>,
     interval: u64,
     repeat: bool,
     target: u64,
@@ -190,11 +193,11 @@ fn helper(input: libc::c_int, messages: Receiver<Req>, _: ()) {
 
                 // drain the file descriptor
                 let mut buf = [0];
-                assert_eq!(fd.inner_read(buf).ok().unwrap(), 1);
+                assert_eq!(fd.read(buf).ok().unwrap(), 1);
             }
 
-            -1 if os::errno() == libc::EINTR as int => {}
-            n => panic!("helper thread panicked in select() with error: {} ({})",
+            -1 if os::errno() == libc::EINTR as uint => {}
+            n => panic!("helper thread failed in select() with error: {} ({})",
                        n, os::last_os_error())
         }
     }
@@ -220,7 +223,11 @@ impl Timer {
         })
     }
 
-    pub fn sleep(ms: u64) {
+    pub fn sleep(&mut self, ms: u64) {
+        let mut inner = self.inner();
+        inner.cb = None; // cancel any previous request
+        self.inner = Some(inner);
+
         let mut to_sleep = libc::timespec {
             tv_sec: (ms / 1000) as libc::time_t,
             tv_nsec: ((ms % 1000) * 1000000) as libc::c_long,
@@ -232,28 +239,7 @@ impl Timer {
         }
     }
 
-    fn inner(&mut self) -> Box<Inner> {
-        match self.inner.take() {
-            Some(i) => i,
-            None => {
-                let (tx, rx) = channel();
-                HELPER.send(RemoveTimer(self.id, tx));
-                rx.recv()
-            }
-        }
-    }
-}
-
-impl rtio::RtioTimer for Timer {
-    fn sleep(&mut self, msecs: u64) {
-        let mut inner = self.inner();
-        inner.cb = None; // cancel any previous request
-        self.inner = Some(inner);
-
-        Timer::sleep(msecs);
-    }
-
-    fn oneshot(&mut self, msecs: u64, cb: Box<rtio::Callback + Send>) {
+    pub fn oneshot(&mut self, msecs: u64, cb: Box<Callback + Send>) {
         let now = now();
         let mut inner = self.inner();
 
@@ -265,7 +251,7 @@ impl rtio::RtioTimer for Timer {
         HELPER.send(NewTimer(inner));
     }
 
-    fn period(&mut self, msecs: u64, cb: Box<rtio::Callback + Send>) {
+    pub fn period(&mut self, msecs: u64, cb: Box<Callback + Send>) {
         let now = now();
         let mut inner = self.inner();
 
@@ -276,6 +262,17 @@ impl rtio::RtioTimer for Timer {
 
         HELPER.send(NewTimer(inner));
     }
+
+    fn inner(&mut self) -> Box<Inner> {
+        match self.inner.take() {
+            Some(i) => i,
+            None => {
+                let (tx, rx) = channel();
+                HELPER.send(RemoveTimer(self.id, tx));
+                rx.recv()
+            }
+        }
+    }
 }
 
 impl Drop for Timer {
diff --git a/src/libstd/sys/windows/mod.rs b/src/libstd/sys/windows/mod.rs
index f50244701e4..0dc06de33e0 100644
--- a/src/libstd/sys/windows/mod.rs
+++ b/src/libstd/sys/windows/mod.rs
@@ -41,6 +41,7 @@ pub mod udp;
 pub mod pipe;
 pub mod helper_signal;
 pub mod process;
+pub mod timer;
 
 pub mod addrinfo {
     pub use sys_common::net::get_host_addresses;
diff --git a/src/libnative/io/timer_windows.rs b/src/libstd/sys/windows/timer.rs
index c17c541fc01..f507be2a985 100644
--- a/src/libnative/io/timer_windows.rs
+++ b/src/libstd/sys/windows/timer.rs
@@ -21,15 +21,21 @@
 //! the other two implementations of timers with nothing *that* new showing up.
 
 use libc;
-use std::ptr;
-use std::rt::rtio;
-use std::rt::rtio::{IoResult, Callback};
-use std::comm;
+use ptr;
+use comm;
 
-use io::helper_thread::Helper;
+use sys::c;
+use sys::fs::FileDesc;
+use sys_common::helper_thread::Helper;
+use prelude::*;
+use io::IoResult;
 
 helper_init!(static HELPER: Helper<Req>)
 
+pub trait Callback {
+    fn call(&mut self);
+}
+
 pub struct Timer {
     obj: libc::HANDLE,
     on_worker: bool,
@@ -116,12 +122,6 @@ impl Timer {
         }
     }
 
-    pub fn sleep(ms: u64) {
-        use std::rt::rtio::RtioTimer;
-        let mut t = Timer::new().ok().expect("must allocate a timer!");
-        t.sleep(ms);
-    }
-
     fn remove(&mut self) {
         if !self.on_worker { return }
 
@@ -131,10 +131,8 @@ impl Timer {
 
         self.on_worker = false;
     }
-}
 
-impl rtio::RtioTimer for Timer {
-    fn sleep(&mut self, msecs: u64) {
+    pub fn sleep(&mut self, msecs: u64) {
         self.remove();
 
         // there are 10^6 nanoseconds in a millisecond, and the parameter is in
@@ -148,7 +146,7 @@ impl rtio::RtioTimer for Timer {
         let _ = unsafe { imp::WaitForSingleObject(self.obj, libc::INFINITE) };
     }
 
-    fn oneshot(&mut self, msecs: u64, cb: Box<Callback + Send>) {
+    pub fn oneshot(&mut self, msecs: u64, cb: Box<Callback + Send>) {
         self.remove();
 
         // see above for the calculation
@@ -162,7 +160,7 @@ impl rtio::RtioTimer for Timer {
         self.on_worker = true;
     }
 
-    fn period(&mut self, msecs: u64, cb: Box<Callback + Send>) {
+    pub fn period(&mut self, msecs: u64, cb: Box<Callback + Send>) {
         self.remove();
 
         // see above for the calculation