Initial thread support

ctr-std/src/lib.rs

@@ -1,6 +1,7 @@
 #![feature(alloc)]
 #![feature(allow_internal_unstable)]
 #![feature(box_syntax)]
+#![feature(cfg_target_has_atomic)]
 #![feature(cfg_target_thread_local)]
 #![feature(collections)]
 #![feature(collections_bound)]
@@ -11,23 +12,30 @@
 #![feature(char_escape_debug)]
 #![feature(dropck_eyepatch)]
 #![feature(float_extras)]
+#![feature(fn_traits)]
 #![feature(fnbox)]
 #![feature(fused)]
 #![feature(generic_param_attrs)]
 #![feature(int_error_internals)]
+#![feature(integer_atomics)]
 #![feature(lang_items)]
 #![feature(macro_reexport)]
 #![feature(oom)]
+#![feature(on_unimplemented)]
 #![feature(optin_builtin_traits)]
 #![feature(prelude_import)]
 #![feature(raw)]
+#![feature(shared)]
 #![feature(slice_concat_ext)]
 #![feature(slice_patterns)]
 #![feature(staged_api)]
 #![feature(str_internals)]
 #![feature(thread_local)]
 #![feature(try_from)]
+#![feature(unboxed_closures)]
 #![feature(unicode)]
+#![feature(unique)]
+#![feature(untagged_unions)]
 #![feature(zero_one)]
 #![allow(non_camel_case_types, dead_code, unused_features)]
 #![no_std]
@@ -151,6 +159,7 @@ pub mod ffi;
 pub mod io;
 pub mod num;
 pub mod os;
+pub mod panic;
 pub mod path;
 pub mod sync;
 pub mod time;

ctr-std/src/panic.rs

@@ -0,0 +1,394 @@
+// Copyright 2015 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.
+
+//! Panic support in the standard library
+
+#![stable(feature = "std_panic", since = "1.9.0")]
+
+use any::Any;
+use cell::UnsafeCell;
+use fmt;
+use ops::{Deref, DerefMut};
+use panicking;
+use ptr::{Unique, Shared};
+use rc::Rc;
+use sync::{Arc, Mutex, RwLock, atomic};
+use thread::Result;
+
+//#[stable(feature = "panic_hooks", since = "1.10.0")]
+//pub use panicking::{take_hook, set_hook, PanicInfo, Location};
+
+/// A marker trait which represents "panic safe" types in Rust.
+///
+/// This trait is implemented by default for many types and behaves similarly in
+/// terms of inference of implementation to the `Send` and `Sync` traits. The
+/// purpose of this trait is to encode what types are safe to cross a `catch_unwind`
+/// boundary with no fear of unwind safety.
+///
+/// ## What is unwind safety?
+///
+/// In Rust a function can "return" early if it either panics or calls a
+/// function which transitively panics. This sort of control flow is not always
+/// anticipated, and has the possibility of causing subtle bugs through a
+/// combination of two cricial components:
+///
+/// 1. A data structure is in a temporarily invalid state when the thread
+///    panics.
+/// 2. This broken invariant is then later observed.
+///
+/// Typically in Rust, it is difficult to perform step (2) because catching a
+/// panic involves either spawning a thread (which in turns makes it difficult
+/// to later witness broken invariants) or using the `catch_unwind` function in this
+/// module. Additionally, even if an invariant is witnessed, it typically isn't a
+/// problem in Rust because there are no uninitialized values (like in C or C++).
+///
+/// It is possible, however, for **logical** invariants to be broken in Rust,
+/// which can end up causing behavioral bugs. Another key aspect of unwind safety
+/// in Rust is that, in the absence of `unsafe` code, a panic cannot lead to
+/// memory unsafety.
+///
+/// That was a bit of a whirlwind tour of unwind safety, but for more information
+/// about unwind safety and how it applies to Rust, see an [associated RFC][rfc].
+///
+/// [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1236-stabilize-catch-panic.md
+///
+/// ## What is `UnwindSafe`?
+///
+/// Now that we've got an idea of what unwind safety is in Rust, it's also
+/// important to understand what this trait represents. As mentioned above, one
+/// way to witness broken invariants is through the `catch_unwind` function in this
+/// module as it allows catching a panic and then re-using the environment of
+/// the closure.
+///
+/// Simply put, a type `T` implements `UnwindSafe` if it cannot easily allow
+/// witnessing a broken invariant through the use of `catch_unwind` (catching a
+/// panic). This trait is a marker trait, so it is automatically implemented for
+/// many types, and it is also structurally composed (e.g. a struct is unwind
+/// safe if all of its components are unwind safe).
+///
+/// Note, however, that this is not an unsafe trait, so there is not a succinct
+/// contract that this trait is providing. Instead it is intended as more of a
+/// "speed bump" to alert users of `catch_unwind` that broken invariants may be
+/// witnessed and may need to be accounted for.
+///
+/// ## Who implements `UnwindSafe`?
+///
+/// Types such as `&mut T` and `&RefCell<T>` are examples which are **not**
+/// unwind safe. The general idea is that any mutable state which can be shared
+/// across `catch_unwind` is not unwind safe by default. This is because it is very
+/// easy to witness a broken invariant outside of `catch_unwind` as the data is
+/// simply accessed as usual.
+///
+/// Types like `&Mutex<T>`, however, are unwind safe because they implement
+/// poisoning by default. They still allow witnessing a broken invariant, but
+/// they already provide their own "speed bumps" to do so.
+///
+/// ## When should `UnwindSafe` be used?
+///
+/// Is not intended that most types or functions need to worry about this trait.
+/// It is only used as a bound on the `catch_unwind` function and as mentioned above,
+/// the lack of `unsafe` means it is mostly an advisory. The `AssertUnwindSafe`
+/// wrapper struct in this module can be used to force this trait to be
+/// implemented for any closed over variables passed to the `catch_unwind` function
+/// (more on this below).
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+#[rustc_on_unimplemented = "the type {Self} may not be safely transferred \
+                            across an unwind boundary"]
+pub trait UnwindSafe {}
+
+/// A marker trait representing types where a shared reference is considered
+/// unwind safe.
+///
+/// This trait is namely not implemented by `UnsafeCell`, the root of all
+/// interior mutability.
+///
+/// This is a "helper marker trait" used to provide impl blocks for the
+/// `UnwindSafe` trait, for more information see that documentation.
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+#[rustc_on_unimplemented = "the type {Self} contains interior mutability \
+                            and a reference may not be safely transferrable \
+                            across a catch_unwind boundary"]
+pub trait RefUnwindSafe {}
+
+/// A simple wrapper around a type to assert that it is unwind safe.
+///
+/// When using `catch_unwind` it may be the case that some of the closed over
+/// variables are not unwind safe. For example if `&mut T` is captured the
+/// compiler will generate a warning indicating that it is not unwind safe. It
+/// may not be the case, however, that this is actually a problem due to the
+/// specific usage of `catch_unwind` if unwind safety is specifically taken into
+/// account. This wrapper struct is useful for a quick and lightweight
+/// annotation that a variable is indeed unwind safe.
+///
+/// # Examples
+///
+/// One way to use `AssertUnwindSafe` is to assert that the entire closure
+/// itself is unwind safe, bypassing all checks for all variables:
+///
+/// ```
+/// use std::panic::{self, AssertUnwindSafe};
+///
+/// let mut variable = 4;
+///
+/// // This code will not compile because the closure captures `&mut variable`
+/// // which is not considered unwind safe by default.
+///
+/// // panic::catch_unwind(|| {
+/// //     variable += 3;
+/// // });
+///
+/// // This, however, will compile due to the `AssertUnwindSafe` wrapper
+/// let result = panic::catch_unwind(AssertUnwindSafe(|| {
+///     variable += 3;
+/// }));
+/// // ...
+/// ```
+///
+/// Wrapping the entire closure amounts to a blanket assertion that all captured
+/// variables are unwind safe. This has the downside that if new captures are
+/// added in the future, they will also be considered unwind safe. Therefore,
+/// you may prefer to just wrap individual captures, as shown below. This is
+/// more annotation, but it ensures that if a new capture is added which is not
+/// unwind safe, you will get a compilation error at that time, which will
+/// allow you to consider whether that new capture in fact represent a bug or
+/// not.
+///
+/// ```
+/// use std::panic::{self, AssertUnwindSafe};
+///
+/// let mut variable = 4;
+/// let other_capture = 3;
+///
+/// let result = {
+///     let mut wrapper = AssertUnwindSafe(&mut variable);
+///     panic::catch_unwind(move || {
+///         **wrapper += other_capture;
+///     })
+/// };
+/// // ...
+/// ```
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+pub struct AssertUnwindSafe<T>(
+    #[stable(feature = "catch_unwind", since = "1.9.0")]
+    pub T
+);
+
+// Implementations of the `UnwindSafe` trait:
+//
+// * By default everything is unwind safe
+// * pointers T contains mutability of some form are not unwind safe
+// * Unique, an owning pointer, lifts an implementation
+// * Types like Mutex/RwLock which are explicilty poisoned are unwind safe
+// * Our custom AssertUnwindSafe wrapper is indeed unwind safe
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl UnwindSafe for .. {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<'a, T: ?Sized> !UnwindSafe for &'a mut T {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<'a, T: RefUnwindSafe + ?Sized> UnwindSafe for &'a T {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: RefUnwindSafe + ?Sized> UnwindSafe for *const T {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: RefUnwindSafe + ?Sized> UnwindSafe for *mut T {}
+#[unstable(feature = "unique", issue = "27730")]
+impl<T: UnwindSafe + ?Sized> UnwindSafe for Unique<T> {}
+#[unstable(feature = "shared", issue = "27730")]
+impl<T: RefUnwindSafe + ?Sized> UnwindSafe for Shared<T> {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: ?Sized> UnwindSafe for Mutex<T> {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: ?Sized> UnwindSafe for RwLock<T> {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T> UnwindSafe for AssertUnwindSafe<T> {}
+
+// not covered via the Shared impl above b/c the inner contents use
+// Cell/AtomicUsize, but the usage here is unwind safe so we can lift the
+// impl up one level to Arc/Rc itself
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: RefUnwindSafe + ?Sized> UnwindSafe for Rc<T> {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: RefUnwindSafe + ?Sized> UnwindSafe for Arc<T> {}
+
+// Pretty simple implementations for the `RefUnwindSafe` marker trait,
+// basically just saying that this is a marker trait and `UnsafeCell` is the
+// only thing which doesn't implement it (which then transitively applies to
+// everything else).
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl RefUnwindSafe for .. {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T: ?Sized> !RefUnwindSafe for UnsafeCell<T> {}
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T> RefUnwindSafe for AssertUnwindSafe<T> {}
+
+#[stable(feature = "unwind_safe_lock_refs", since = "1.12.0")]
+impl<T: ?Sized> RefUnwindSafe for Mutex<T> {}
+#[stable(feature = "unwind_safe_lock_refs", since = "1.12.0")]
+impl<T: ?Sized> RefUnwindSafe for RwLock<T> {}
+
+#[cfg(target_has_atomic = "ptr")]
+#[stable(feature = "unwind_safe_atomic_refs", since = "1.14.0")]
+impl RefUnwindSafe for atomic::AtomicIsize {}
+#[cfg(target_has_atomic = "8")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicI8 {}
+#[cfg(target_has_atomic = "16")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicI16 {}
+#[cfg(target_has_atomic = "32")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicI32 {}
+#[cfg(target_has_atomic = "64")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicI64 {}
+
+#[cfg(target_has_atomic = "ptr")]
+#[stable(feature = "unwind_safe_atomic_refs", since = "1.14.0")]
+impl RefUnwindSafe for atomic::AtomicUsize {}
+#[cfg(target_has_atomic = "8")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicU8 {}
+#[cfg(target_has_atomic = "16")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicU16 {}
+#[cfg(target_has_atomic = "32")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicU32 {}
+#[cfg(target_has_atomic = "64")]
+#[unstable(feature = "integer_atomics", issue = "32976")]
+impl RefUnwindSafe for atomic::AtomicU64 {}
+
+#[cfg(target_has_atomic = "8")]
+#[stable(feature = "unwind_safe_atomic_refs", since = "1.14.0")]
+impl RefUnwindSafe for atomic::AtomicBool {}
+
+#[cfg(target_has_atomic = "ptr")]
+#[stable(feature = "unwind_safe_atomic_refs", since = "1.14.0")]
+impl<T> RefUnwindSafe for atomic::AtomicPtr<T> {}
+
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T> Deref for AssertUnwindSafe<T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        &self.0
+    }
+}
+
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<T> DerefMut for AssertUnwindSafe<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        &mut self.0
+    }
+}
+
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+impl<R, F: FnOnce() -> R> FnOnce<()> for AssertUnwindSafe<F> {
+    type Output = R;
+
+    extern "rust-call" fn call_once(self, _args: ()) -> R {
+        (self.0)()
+    }
+}
+
+#[stable(feature = "std_debug", since = "1.16.0")]
+impl<T: fmt::Debug> fmt::Debug for AssertUnwindSafe<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_tuple("AssertUnwindSafe")
+            .field(&self.0)
+            .finish()
+    }
+}
+
+/// Invokes a closure, capturing the cause of an unwinding panic if one occurs.
+///
+/// This function will return `Ok` with the closure's result if the closure
+/// does not panic, and will return `Err(cause)` if the closure panics. The
+/// `cause` returned is the object with which panic was originally invoked.
+///
+/// It is currently undefined behavior to unwind from Rust code into foreign
+/// code, so this function is particularly useful when Rust is called from
+/// another language (normally C). This can run arbitrary Rust code, capturing a
+/// panic and allowing a graceful handling of the error.
+///
+/// It is **not** recommended to use this function for a general try/catch
+/// mechanism. The `Result` type is more appropriate to use for functions that
+/// can fail on a regular basis. Additionally, this function is not guaranteed
+/// to catch all panics, see the "Notes" section below.
+///
+/// The closure provided is required to adhere to the `UnwindSafe` trait to ensure
+/// that all captured variables are safe to cross this boundary. The purpose of
+/// this bound is to encode the concept of [exception safety][rfc] in the type
+/// system. Most usage of this function should not need to worry about this
+/// bound as programs are naturally unwind safe without `unsafe` code. If it
+/// becomes a problem the associated `AssertUnwindSafe` wrapper type in this
+/// module can be used to quickly assert that the usage here is indeed unwind
+/// safe.
+///
+/// [rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1236-stabilize-catch-panic.md
+///
+/// # Notes
+///
+/// Note that this function **may not catch all panics** in Rust. A panic in
+/// Rust is not always implemented via unwinding, but can be implemented by
+/// aborting the process as well. This function *only* catches unwinding panics,
+/// not those that abort the process.
+///
+/// # Examples
+///
+/// ```
+/// use std::panic;
+///
+/// let result = panic::catch_unwind(|| {
+///     println!("hello!");
+/// });
+/// assert!(result.is_ok());
+///
+/// let result = panic::catch_unwind(|| {
+///     panic!("oh no!");
+/// });
+/// assert!(result.is_err());
+/// ```
+#[stable(feature = "catch_unwind", since = "1.9.0")]
+pub fn catch_unwind<F: FnOnce() -> R + UnwindSafe, R>(f: F) -> Result<R> {
+    unsafe {
+        panicking::try(f)
+    }
+}
+
+/// Triggers a panic without invoking the panic hook.
+///
+/// This is designed to be used in conjunction with `catch_unwind` to, for
+/// example, carry a panic across a layer of C code.
+///
+/// # Notes
+///
+/// Note that panics in Rust are not always implemented via unwinding, but they
+/// may be implemented by aborting the process. If this function is called when
+/// panics are implemented this way then this function will abort the process,
+/// not trigger an unwind.
+///
+/// # Examples
+///
+/// ```should_panic
+/// use std::panic;
+///
+/// let result = panic::catch_unwind(|| {
+///     panic!("oh no!");
+/// });
+///
+/// if let Err(err) = result {
+///     panic::resume_unwind(err);
+/// }
+/// ```
+#[stable(feature = "resume_unwind", since = "1.9.0")]
+// we always abort so I'm pretty sure there's no reason to ever call this
+pub fn resume_unwind(_payload: Box<Any + Send>) -> ! {
+    unimplemented!()
+}

ctr-std/src/panicking.rs

@@ -16,6 +16,9 @@ use io::prelude::*;
 use any::Any;
 use cell::RefCell;
 use fmt;
+use mem;
+use ptr;
+use raw;
 use __core::fmt::Display;
 
 thread_local! {
@@ -26,11 +29,11 @@ thread_local! {
 
 ///The compiler wants this to be here. Otherwise it won't be happy. And we like happy compilers.
 #[lang = "eh_personality"]
-extern fn eh_personality() {}
+pub extern fn eh_personality() {}
 
 /// Entry point of panic from the libcore crate.
 #[lang = "panic_fmt"]
-extern fn rust_begin_panic(msg: fmt::Arguments, file: &'static str, line: u32) -> ! {
+pub extern fn rust_begin_panic(msg: fmt::Arguments, file: &'static str, line: u32) -> ! {
     begin_panic_fmt(&msg, &(file, line))
 }
 
@@ -52,17 +55,115 @@ pub fn begin_panic_fmt(msg: &fmt::Arguments, file_line: &(&'static str, u32)) ->
     begin_panic(s, file_line);
 }
 
-/// This is where the main panic logic happens.
+/// We don't have stack unwinding, so all we do is print the panic message
+/// and then loop forever
 #[inline(never)]
 #[cold]
 pub fn begin_panic<M: Any + Send + Display>(msg: M, file_line: &(&'static str, u32)) -> ! {
     let msg = Box::new(msg);
     let (file, line) = *file_line;
 
-    print!("--------------------------------------------------");
+    use libctru::console::consoleInit;
+    use libctru::gfx::gfxScreen_t;
+
+    // set up a new console, overwriting whatever was on the top screen
+    // before we started panicking
+    let _console = unsafe { consoleInit(gfxScreen_t::GFX_TOP, ptr::null_mut()) };
+
     println!("PANIC in {} at line {}:", file, line);
     println!("    {}", msg);
-    print!("\x1b[29;00H--------------------------------------------------");
 
     loop {}
 }
+
+/// Invoke a closure, capturing the cause of an unwinding panic if one occurs.
+pub unsafe fn try<R, F: FnOnce() -> R>(f: F) -> Result<R, Box<Any + Send>> {
+    #[allow(unions_with_drop_fields)]
+    union Data<F, R> {
+        f: F,
+        r: R,
+    }
+
+    // We do some sketchy operations with ownership here for the sake of
+    // performance. We can only  pass pointers down to
+    // `__rust_maybe_catch_panic` (can't pass objects by value), so we do all
+    // the ownership tracking here manually using a union.
+    //
+    // We go through a transition where:
+    //
+    // * First, we set the data to be the closure that we're going to call.
+    // * When we make the function call, the `do_call` function below, we take
+    //   ownership of the function pointer. At this point the `Data` union is
+    //   entirely uninitialized.
+    // * If the closure successfully returns, we write the return value into the
+    //   data's return slot. Note that `ptr::write` is used as it's overwriting
+    //   uninitialized data.
+    // * Finally, when we come back out of the `__rust_maybe_catch_panic` we're
+    //   in one of two states:
+    //
+    //      1. The closure didn't panic, in which case the return value was
+    //         filled in. We move it out of `data` and return it.
+    //      2. The closure panicked, in which case the return value wasn't
+    //         filled in. In this case the entire `data` union is invalid, so
+    //         there is no need to drop anything.
+    //
+    // Once we stack all that together we should have the "most efficient'
+    // method of calling a catch panic whilst juggling ownership.
+    let mut any_data = 0;
+    let mut any_vtable = 0;
+    let mut data = Data {
+        f: f,
+    };
+
+    let r = __rust_maybe_catch_panic(do_call::<F, R>,
+                                     &mut data as *mut _ as *mut u8,
+                                     &mut any_data,
+                                     &mut any_vtable);
+
+    return if r == 0 {
+        debug_assert!(update_panic_count(0) == 0);
+        Ok(data.r)
+    } else {
+        update_panic_count(-1);
+        debug_assert!(update_panic_count(0) == 0);
+        Err(mem::transmute(raw::TraitObject {
+            data: any_data as *mut _,
+            vtable: any_vtable as *mut _,
+        }))
+    };
+
+    fn do_call<F: FnOnce() -> R, R>(data: *mut u8) {
+        unsafe {
+            let data = data as *mut Data<F, R>;
+            let f = ptr::read(&mut (*data).f);
+            ptr::write(&mut (*data).r, f());
+        }
+    }
+}
+
+#[cfg(not(test))]
+#[doc(hidden)]
+#[unstable(feature = "update_panic_count", issue = "0")]
+pub fn update_panic_count(amt: isize) -> usize {
+    use cell::Cell;
+    thread_local! { static PANIC_COUNT: Cell<usize> = Cell::new(0) }
+
+    PANIC_COUNT.with(|c| {
+        let next = (c.get() as isize + amt) as usize;
+        c.set(next);
+        return next
+    })
+}
+
+// *Implementation borrowed from the libpanic_abort crate*
+//
+// Rust's "try" function, but if we're aborting on panics we just call the
+// function as there's nothing else we need to do here.
+#[allow(improper_ctypes)]
+extern fn __rust_maybe_catch_panic(f: fn(*mut u8),
+                                data: *mut u8,
+                                _data_ptr: *mut usize,
+								_vtable_ptr: *mut usize) -> u32 {
+    f(data);
+    0
+}

ctr-std/src/sync/condvar.rs

@@ -0,0 +1,589 @@
+// Copyright 2014 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 fmt;
+use sync::atomic::{AtomicUsize, Ordering};
+use sync::{mutex, MutexGuard, PoisonError};
+use sys_common::condvar as sys;
+use sys_common::mutex as sys_mutex;
+use sys_common::poison::{self, LockResult};
+use time::Duration;
+
+/// A type indicating whether a timed wait on a condition variable returned
+/// due to a time out or not.
+///
+/// It is returned by the [`wait_timeout`] method.
+///
+/// [`wait_timeout`]: struct.Condvar.html#method.wait_timeout
+#[derive(Debug, PartialEq, Eq, Copy, Clone)]
+#[stable(feature = "wait_timeout", since = "1.5.0")]
+pub struct WaitTimeoutResult(bool);
+
+impl WaitTimeoutResult {
+    /// Returns whether the wait was known to have timed out.
+    ///
+    /// # Examples
+    ///
+    /// This example spawns a thread which will update the boolean value and
+    /// then wait 100 milliseconds before notifying the condvar.
+    ///
+    /// The main thread will wait with a timeout on the condvar and then leave
+    /// once the boolean has been updated and notified.
+    ///
+    /// ```
+    /// use std::sync::{Arc, Mutex, Condvar};
+    /// use std::thread;
+    /// use std::time::Duration;
+    ///
+    /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+    /// let pair2 = pair.clone();
+    ///
+    /// thread::spawn(move|| {
+    ///     let &(ref lock, ref cvar) = &*pair2;
+    ///     let mut started = lock.lock().unwrap();
+    ///     // We update the boolean value.
+    ///     *started = true;
+    ///     // Let's wait 20 milliseconds before notifying the condvar.
+    ///     thread::sleep(Duration::from_millis(20));
+    ///     cvar.notify_one();
+    /// });
+    ///
+    /// // Wait for the thread to start up.
+    /// let &(ref lock, ref cvar) = &*pair;
+    /// let mut started = lock.lock().unwrap();
+    /// loop {
+    ///     // Let's put a timeout on the condvar's wait.
+    ///     let result = cvar.wait_timeout(started, Duration::from_millis(10)).unwrap();
+    ///     // 10 milliseconds have passed, or maybe the value changed!
+    ///     started = result.0;
+    ///     if *started == true {
+    ///         // We received the notification and the value has been updated, we can leave.
+    ///         break
+    ///     }
+    /// }
+    /// ```
+    #[stable(feature = "wait_timeout", since = "1.5.0")]
+    pub fn timed_out(&self) -> bool {
+        self.0
+    }
+}
+
+/// A Condition Variable
+///
+/// Condition variables represent the ability to block a thread such that it
+/// consumes no CPU time while waiting for an event to occur. Condition
+/// variables are typically associated with a boolean predicate (a condition)
+/// and a mutex. The predicate is always verified inside of the mutex before
+/// determining that a thread must block.
+///
+/// Functions in this module will block the current **thread** of execution and
+/// are bindings to system-provided condition variables where possible. Note
+/// that this module places one additional restriction over the system condition
+/// variables: each condvar can be used with precisely one mutex at runtime. Any
+/// attempt to use multiple mutexes on the same condition variable will result
+/// in a runtime panic. If this is not desired, then the unsafe primitives in
+/// `sys` do not have this restriction but may result in undefined behavior.
+///
+/// # Examples
+///
+/// ```
+/// use std::sync::{Arc, Mutex, Condvar};
+/// use std::thread;
+///
+/// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+/// let pair2 = pair.clone();
+///
+/// // Inside of our lock, spawn a new thread, and then wait for it to start.
+/// thread::spawn(move|| {
+///     let &(ref lock, ref cvar) = &*pair2;
+///     let mut started = lock.lock().unwrap();
+///     *started = true;
+///     // We notify the condvar that the value has changed.
+///     cvar.notify_one();
+/// });
+///
+/// // Wait for the thread to start up.
+/// let &(ref lock, ref cvar) = &*pair;
+/// let mut started = lock.lock().unwrap();
+/// while !*started {
+///     started = cvar.wait(started).unwrap();
+/// }
+/// ```
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct Condvar {
+    inner: Box<sys::Condvar>,
+    mutex: AtomicUsize,
+}
+
+impl Condvar {
+    /// Creates a new condition variable which is ready to be waited on and
+    /// notified.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::Condvar;
+    ///
+    /// let condvar = Condvar::new();
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn new() -> Condvar {
+        let mut c = Condvar {
+            inner: box sys::Condvar::new(),
+            mutex: AtomicUsize::new(0),
+        };
+        unsafe {
+            c.inner.init();
+        }
+        c
+    }
+
+    /// Blocks the current thread until this condition variable receives a
+    /// notification.
+    ///
+    /// This function will atomically unlock the mutex specified (represented by
+    /// `guard`) and block the current thread. This means that any calls
+    /// to [`notify_one()`] or [`notify_all()`] which happen logically after the
+    /// mutex is unlocked are candidates to wake this thread up. When this
+    /// function call returns, the lock specified will have been re-acquired.
+    ///
+    /// Note that this function is susceptible to spurious wakeups. Condition
+    /// variables normally have a boolean predicate associated with them, and
+    /// the predicate must always be checked each time this function returns to
+    /// protect against spurious wakeups.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the mutex being waited on is
+    /// poisoned when this thread re-acquires the lock. For more information,
+    /// see information about [poisoning] on the [`Mutex`] type.
+    ///
+    /// # Panics
+    ///
+    /// This function will [`panic!()`] if it is used with more than one mutex
+    /// over time. Each condition variable is dynamically bound to exactly one
+    /// mutex to ensure defined behavior across platforms. If this functionality
+    /// is not desired, then unsafe primitives in `sys` are provided.
+    ///
+    /// [`notify_one()`]: #method.notify_one
+    /// [`notify_all()`]: #method.notify_all
+    /// [poisoning]: ../sync/struct.Mutex.html#poisoning
+    /// [`Mutex`]: ../sync/struct.Mutex.html
+    /// [`panic!()`]: ../../std/macro.panic.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::{Arc, Mutex, Condvar};
+    /// use std::thread;
+    ///
+    /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+    /// let pair2 = pair.clone();
+    ///
+    /// thread::spawn(move|| {
+    ///     let &(ref lock, ref cvar) = &*pair2;
+    ///     let mut started = lock.lock().unwrap();
+    ///     *started = true;
+    ///     // We notify the condvar that the value has changed.
+    ///     cvar.notify_one();
+    /// });
+    ///
+    /// // Wait for the thread to start up.
+    /// let &(ref lock, ref cvar) = &*pair;
+    /// let mut started = lock.lock().unwrap();
+    /// // As long as the value inside the `Mutex` is false, we wait.
+    /// while !*started {
+    ///     started = cvar.wait(started).unwrap();
+    /// }
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn wait<'a, T>(&self, guard: MutexGuard<'a, T>)
+                       -> LockResult<MutexGuard<'a, T>> {
+        let poisoned = unsafe {
+            let lock = mutex::guard_lock(&guard);
+            self.verify(lock);
+            self.inner.wait(lock);
+            mutex::guard_poison(&guard).get()
+        };
+        if poisoned {
+            Err(PoisonError::new(guard))
+        } else {
+            Ok(guard)
+        }
+    }
+
+    /// Waits on this condition variable for a notification, timing out after a
+    /// specified duration.
+    ///
+    /// The semantics of this function are equivalent to [`wait`]
+    /// except that the thread will be blocked for roughly no longer
+    /// than `ms` milliseconds. This method should not be used for
+    /// precise timing due to anomalies such as preemption or platform
+    /// differences that may not cause the maximum amount of time
+    /// waited to be precisely `ms`.
+    ///
+    /// Note that the best effort is made to ensure that the time waited is
+    /// measured with a monotonic clock, and not affected by the changes made to
+    /// the system time.
+    ///
+    /// The returned boolean is `false` only if the timeout is known
+    /// to have elapsed.
+    ///
+    /// Like [`wait`], the lock specified will be re-acquired when this function
+    /// returns, regardless of whether the timeout elapsed or not.
+    ///
+    /// [`wait`]: #method.wait
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::{Arc, Mutex, Condvar};
+    /// use std::thread;
+    ///
+    /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+    /// let pair2 = pair.clone();
+    ///
+    /// thread::spawn(move|| {
+    ///     let &(ref lock, ref cvar) = &*pair2;
+    ///     let mut started = lock.lock().unwrap();
+    ///     *started = true;
+    ///     // We notify the condvar that the value has changed.
+    ///     cvar.notify_one();
+    /// });
+    ///
+    /// // Wait for the thread to start up.
+    /// let &(ref lock, ref cvar) = &*pair;
+    /// let mut started = lock.lock().unwrap();
+    /// // As long as the value inside the `Mutex` is false, we wait.
+    /// loop {
+    ///     let result = cvar.wait_timeout_ms(started, 10).unwrap();
+    ///     // 10 milliseconds have passed, or maybe the value changed!
+    ///     started = result.0;
+    ///     if *started == true {
+    ///         // We received the notification and the value has been updated, we can leave.
+    ///         break
+    ///     }
+    /// }
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    #[rustc_deprecated(since = "1.6.0", reason = "replaced by `std::sync::Condvar::wait_timeout`")]
+    pub fn wait_timeout_ms<'a, T>(&self, guard: MutexGuard<'a, T>, ms: u32)
+                                  -> LockResult<(MutexGuard<'a, T>, bool)> {
+        let res = self.wait_timeout(guard, Duration::from_millis(ms as u64));
+        poison::map_result(res, |(a, b)| {
+            (a, !b.timed_out())
+        })
+    }
+
+    /// Waits on this condition variable for a notification, timing out after a
+    /// specified duration.
+    ///
+    /// The semantics of this function are equivalent to [`wait`] except that
+    /// the thread will be blocked for roughly no longer than `dur`. This
+    /// method should not be used for precise timing due to anomalies such as
+    /// preemption or platform differences that may not cause the maximum
+    /// amount of time waited to be precisely `dur`.
+    ///
+    /// Note that the best effort is made to ensure that the time waited is
+    /// measured with a monotonic clock, and not affected by the changes made to
+    /// the system time.
+    ///
+    /// The returned [`WaitTimeoutResult`] value indicates if the timeout is
+    /// known to have elapsed.
+    ///
+    /// Like [`wait`], the lock specified will be re-acquired when this function
+    /// returns, regardless of whether the timeout elapsed or not.
+    ///
+    /// [`wait`]: #method.wait
+    /// [`WaitTimeoutResult`]: struct.WaitTimeoutResult.html
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::{Arc, Mutex, Condvar};
+    /// use std::thread;
+    /// use std::time::Duration;
+    ///
+    /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+    /// let pair2 = pair.clone();
+    ///
+    /// thread::spawn(move|| {
+    ///     let &(ref lock, ref cvar) = &*pair2;
+    ///     let mut started = lock.lock().unwrap();
+    ///     *started = true;
+    ///     // We notify the condvar that the value has changed.
+    ///     cvar.notify_one();
+    /// });
+    ///
+    /// // wait for the thread to start up
+    /// let &(ref lock, ref cvar) = &*pair;
+    /// let mut started = lock.lock().unwrap();
+    /// // as long as the value inside the `Mutex` is false, we wait
+    /// loop {
+    ///     let result = cvar.wait_timeout(started, Duration::from_millis(10)).unwrap();
+    ///     // 10 milliseconds have passed, or maybe the value changed!
+    ///     started = result.0;
+    ///     if *started == true {
+    ///         // We received the notification and the value has been updated, we can leave.
+    ///         break
+    ///     }
+    /// }
+    /// ```
+    #[stable(feature = "wait_timeout", since = "1.5.0")]
+    pub fn wait_timeout<'a, T>(&self, guard: MutexGuard<'a, T>,
+                               dur: Duration)
+                               -> LockResult<(MutexGuard<'a, T>, WaitTimeoutResult)> {
+        let (poisoned, result) = unsafe {
+            let lock = mutex::guard_lock(&guard);
+            self.verify(lock);
+            let success = self.inner.wait_timeout(lock, dur);
+            (mutex::guard_poison(&guard).get(), WaitTimeoutResult(!success))
+        };
+        if poisoned {
+            Err(PoisonError::new((guard, result)))
+        } else {
+            Ok((guard, result))
+        }
+    }
+
+    /// Wakes up one blocked thread on this condvar.
+    ///
+    /// If there is a blocked thread on this condition variable, then it will
+    /// be woken up from its call to [`wait`] or [`wait_timeout`]. Calls to
+    /// `notify_one` are not buffered in any way.
+    ///
+    /// To wake up all threads, see [`notify_all()`].
+    ///
+    /// [`wait`]: #method.wait
+    /// [`wait_timeout`]: #method.wait_timeout
+    /// [`notify_all()`]: #method.notify_all
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::{Arc, Mutex, Condvar};
+    /// use std::thread;
+    ///
+    /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+    /// let pair2 = pair.clone();
+    ///
+    /// thread::spawn(move|| {
+    ///     let &(ref lock, ref cvar) = &*pair2;
+    ///     let mut started = lock.lock().unwrap();
+    ///     *started = true;
+    ///     // We notify the condvar that the value has changed.
+    ///     cvar.notify_one();
+    /// });
+    ///
+    /// // Wait for the thread to start up.
+    /// let &(ref lock, ref cvar) = &*pair;
+    /// let mut started = lock.lock().unwrap();
+    /// // As long as the value inside the `Mutex` is false, we wait.
+    /// while !*started {
+    ///     started = cvar.wait(started).unwrap();
+    /// }
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn notify_one(&self) {
+        unsafe { self.inner.notify_one() }
+    }
+
+    /// Wakes up all blocked threads on this condvar.
+    ///
+    /// This method will ensure that any current waiters on the condition
+    /// variable are awoken. Calls to `notify_all()` are not buffered in any
+    /// way.
+    ///
+    /// To wake up only one thread, see [`notify_one()`].
+    ///
+    /// [`notify_one()`]: #method.notify_one
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::{Arc, Mutex, Condvar};
+    /// use std::thread;
+    ///
+    /// let pair = Arc::new((Mutex::new(false), Condvar::new()));
+    /// let pair2 = pair.clone();
+    ///
+    /// thread::spawn(move|| {
+    ///     let &(ref lock, ref cvar) = &*pair2;
+    ///     let mut started = lock.lock().unwrap();
+    ///     *started = true;
+    ///     // We notify the condvar that the value has changed.
+    ///     cvar.notify_all();
+    /// });
+    ///
+    /// // Wait for the thread to start up.
+    /// let &(ref lock, ref cvar) = &*pair;
+    /// let mut started = lock.lock().unwrap();
+    /// // As long as the value inside the `Mutex` is false, we wait.
+    /// while !*started {
+    ///     started = cvar.wait(started).unwrap();
+    /// }
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn notify_all(&self) {
+        unsafe { self.inner.notify_all() }
+    }
+
+    fn verify(&self, mutex: &sys_mutex::Mutex) {
+        let addr = mutex as *const _ as usize;
+        match self.mutex.compare_and_swap(0, addr, Ordering::SeqCst) {
+            // If we got out 0, then we have successfully bound the mutex to
+            // this cvar.
+            0 => {}
+
+            // If we get out a value that's the same as `addr`, then someone
+            // already beat us to the punch.
+            n if n == addr => {}
+
+            // Anything else and we're using more than one mutex on this cvar,
+            // which is currently disallowed.
+            _ => panic!("attempted to use a condition variable with two \
+                         mutexes"),
+        }
+    }
+}
+
+#[stable(feature = "std_debug", since = "1.16.0")]
+impl fmt::Debug for Condvar {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.pad("Condvar { .. }")
+    }
+}
+
+#[stable(feature = "condvar_default", since = "1.9.0")]
+impl Default for Condvar {
+    /// Creates a `Condvar` which is ready to be waited on and notified.
+    fn default() -> Condvar {
+        Condvar::new()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl Drop for Condvar {
+    fn drop(&mut self) {
+        unsafe { self.inner.destroy() }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use sync::mpsc::channel;
+    use sync::{Condvar, Mutex, Arc};
+    use thread;
+    use time::Duration;
+    use u32;
+
+    #[test]
+    fn smoke() {
+        let c = Condvar::new();
+        c.notify_one();
+        c.notify_all();
+    }
+
+    #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
+    fn notify_one() {
+        let m = Arc::new(Mutex::new(()));
+        let m2 = m.clone();
+        let c = Arc::new(Condvar::new());
+        let c2 = c.clone();
+
+        let g = m.lock().unwrap();
+        let _t = thread::spawn(move|| {
+            let _g = m2.lock().unwrap();
+            c2.notify_one();
+        });
+        let g = c.wait(g).unwrap();
+        drop(g);
+    }
+
+    #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
+    fn notify_all() {
+        const N: usize = 10;
+
+        let data = Arc::new((Mutex::new(0), Condvar::new()));
+        let (tx, rx) = channel();
+        for _ in 0..N {
+            let data = data.clone();
+            let tx = tx.clone();
+            thread::spawn(move|| {
+                let &(ref lock, ref cond) = &*data;
+                let mut cnt = lock.lock().unwrap();
+                *cnt += 1;
+                if *cnt == N {
+                    tx.send(()).unwrap();
+                }
+                while *cnt != 0 {
+                    cnt = cond.wait(cnt).unwrap();
+                }
+                tx.send(()).unwrap();
+            });
+        }
+        drop(tx);
+
+        let &(ref lock, ref cond) = &*data;
+        rx.recv().unwrap();
+        let mut cnt = lock.lock().unwrap();
+        *cnt = 0;
+        cond.notify_all();
+        drop(cnt);
+
+        for _ in 0..N {
+            rx.recv().unwrap();
+        }
+    }
+
+    #[test]
+    #[cfg_attr(target_os = "emscripten", ignore)]
+    fn wait_timeout_ms() {
+        let m = Arc::new(Mutex::new(()));
+        let m2 = m.clone();
+        let c = Arc::new(Condvar::new());
+        let c2 = c.clone();
+
+        let g = m.lock().unwrap();
+        let (g, _no_timeout) = c.wait_timeout(g, Duration::from_millis(1)).unwrap();
+        // spurious wakeups mean this isn't necessarily true
+        // assert!(!no_timeout);
+        let _t = thread::spawn(move || {
+            let _g = m2.lock().unwrap();
+            c2.notify_one();
+        });
+        let (g, timeout_res) = c.wait_timeout(g, Duration::from_millis(u32::MAX as u64)).unwrap();
+        assert!(!timeout_res.timed_out());
+        drop(g);
+    }
+
+    #[test]
+    #[should_panic]
+    #[cfg_attr(target_os = "emscripten", ignore)]
+    fn two_mutexes() {
+        let m = Arc::new(Mutex::new(()));
+        let m2 = m.clone();
+        let c = Arc::new(Condvar::new());
+        let c2 = c.clone();
+
+        let mut g = m.lock().unwrap();
+        let _t = thread::spawn(move|| {
+            let _g = m2.lock().unwrap();
+            c2.notify_one();
+        });
+        g = c.wait(g).unwrap();
+        drop(g);
+
+        let m = Mutex::new(());
+        let _ = c.wait(m.lock().unwrap()).unwrap();
+    }
+}

ctr-std/src/sync/mod.rs

@@ -21,9 +21,16 @@
 pub use alloc::arc::{Arc, Weak};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::sync::atomic;
+
+#[stable(feature = "rust1", since = "1.0.0")]
+pub use self::condvar::{Condvar, WaitTimeoutResult};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use self::mutex::{Mutex, MutexGuard};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use sys_common::poison::{PoisonError, TryLockError, TryLockResult, LockResult};
+#[stable(feature = "rust1", since = "1.0.0")]
+pub use self::rwlock::{RwLock, RwLockReadGuard, RwLockWriteGuard};
 
+mod condvar;
 mod mutex;
+mod rwlock;

ctr-std/src/sync/rwlock.rs

@@ -0,0 +1,666 @@
+// Copyright 2014 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 cell::UnsafeCell;
+use fmt;
+use marker;
+use mem;
+use ops::{Deref, DerefMut};
+use ptr;
+use sys_common::poison::{self, LockResult, TryLockError, TryLockResult};
+use sys_common::rwlock as sys;
+
+/// A reader-writer lock
+///
+/// This type of lock allows a number of readers or at most one writer at any
+/// point in time. The write portion of this lock typically allows modification
+/// of the underlying data (exclusive access) and the read portion of this lock
+/// typically allows for read-only access (shared access).
+///
+/// The priority policy of the lock is dependent on the underlying operating
+/// system's implementation, and this type does not guarantee that any
+/// particular policy will be used.
+///
+/// The type parameter `T` represents the data that this lock protects. It is
+/// required that `T` satisfies `Send` to be shared across threads and `Sync` to
+/// allow concurrent access through readers. The RAII guards returned from the
+/// locking methods implement `Deref` (and `DerefMut` for the `write` methods)
+/// to allow access to the contained of the lock.
+///
+/// # Poisoning
+///
+/// An `RwLock`, like `Mutex`, will become poisoned on a panic. Note, however,
+/// that an `RwLock` may only be poisoned if a panic occurs while it is locked
+/// exclusively (write mode). If a panic occurs in any reader, then the lock
+/// will not be poisoned.
+///
+/// # Examples
+///
+/// ```
+/// use std::sync::RwLock;
+///
+/// let lock = RwLock::new(5);
+///
+/// // many reader locks can be held at once
+/// {
+///     let r1 = lock.read().unwrap();
+///     let r2 = lock.read().unwrap();
+///     assert_eq!(*r1, 5);
+///     assert_eq!(*r2, 5);
+/// } // read locks are dropped at this point
+///
+/// // only one write lock may be held, however
+/// {
+///     let mut w = lock.write().unwrap();
+///     *w += 1;
+///     assert_eq!(*w, 6);
+/// } // write lock is dropped here
+/// ```
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct RwLock<T: ?Sized> {
+    inner: Box<sys::RWLock>,
+    poison: poison::Flag,
+    data: UnsafeCell<T>,
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+unsafe impl<T: ?Sized + Send + Sync> Send for RwLock<T> {}
+#[stable(feature = "rust1", since = "1.0.0")]
+unsafe impl<T: ?Sized + Send + Sync> Sync for RwLock<T> {}
+
+/// RAII structure used to release the shared read access of a lock when
+/// dropped.
+///
+/// This structure is created by the [`read()`] and [`try_read()`] methods on
+/// [`RwLock`].
+///
+/// [`read()`]: struct.RwLock.html#method.read
+/// [`try_read()`]: struct.RwLock.html#method.try_read
+/// [`RwLock`]: struct.RwLock.html
+#[must_use]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct RwLockReadGuard<'a, T: ?Sized + 'a> {
+    __lock: &'a RwLock<T>,
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a, T: ?Sized> !marker::Send for RwLockReadGuard<'a, T> {}
+
+/// RAII structure used to release the exclusive write access of a lock when
+/// dropped.
+///
+/// This structure is created by the [`write()`] and [`try_write()`] methods
+/// on [`RwLock`].
+///
+/// [`write()`]: struct.RwLock.html#method.write
+/// [`try_write()`]: struct.RwLock.html#method.try_write
+/// [`RwLock`]: struct.RwLock.html
+#[must_use]
+#[stable(feature = "rust1", since = "1.0.0")]
+pub struct RwLockWriteGuard<'a, T: ?Sized + 'a> {
+    __lock: &'a RwLock<T>,
+    __poison: poison::Guard,
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a, T: ?Sized> !marker::Send for RwLockWriteGuard<'a, T> {}
+
+impl<T> RwLock<T> {
+    /// Creates a new instance of an `RwLock<T>` which is unlocked.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// use std::sync::RwLock;
+    ///
+    /// let lock = RwLock::new(5);
+    /// ```
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn new(t: T) -> RwLock<T> {
+        RwLock {
+            inner: box sys::RWLock::new(),
+            poison: poison::Flag::new(),
+            data: UnsafeCell::new(t),
+        }
+    }
+}
+
+impl<T: ?Sized> RwLock<T> {
+    /// Locks this rwlock with shared read access, blocking the current thread
+    /// until it can be acquired.
+    ///
+    /// The calling thread will be blocked until there are no more writers which
+    /// hold the lock. There may be other readers currently inside the lock when
+    /// this method returns. This method does not provide any guarantees with
+    /// respect to the ordering of whether contentious readers or writers will
+    /// acquire the lock first.
+    ///
+    /// Returns an RAII guard which will release this thread's shared access
+    /// once it is dropped.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the RwLock is poisoned. An RwLock
+    /// is poisoned whenever a writer panics while holding an exclusive lock.
+    /// The failure will occur immediately after the lock has been acquired.
+    ///
+    /// # Panics
+    ///
+    /// This function might panic when called if the lock is already held by the current thread.
+    #[inline]
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn read(&self) -> LockResult<RwLockReadGuard<T>> {
+        unsafe {
+            self.inner.read();
+            RwLockReadGuard::new(self)
+        }
+    }
+
+    /// Attempts to acquire this rwlock with shared read access.
+    ///
+    /// If the access could not be granted at this time, then `Err` is returned.
+    /// Otherwise, an RAII guard is returned which will release the shared access
+    /// when it is dropped.
+    ///
+    /// This function does not block.
+    ///
+    /// This function does not provide any guarantees with respect to the ordering
+    /// of whether contentious readers or writers will acquire the lock first.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the RwLock is poisoned. An RwLock
+    /// is poisoned whenever a writer panics while holding an exclusive lock. An
+    /// error will only be returned if the lock would have otherwise been
+    /// acquired.
+    #[inline]
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn try_read(&self) -> TryLockResult<RwLockReadGuard<T>> {
+        unsafe {
+            if self.inner.try_read() {
+                Ok(RwLockReadGuard::new(self)?)
+            } else {
+                Err(TryLockError::WouldBlock)
+            }
+        }
+    }
+
+    /// Locks this rwlock with exclusive write access, blocking the current
+    /// thread until it can be acquired.
+    ///
+    /// This function will not return while other writers or other readers
+    /// currently have access to the lock.
+    ///
+    /// Returns an RAII guard which will drop the write access of this rwlock
+    /// when dropped.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the RwLock is poisoned. An RwLock
+    /// is poisoned whenever a writer panics while holding an exclusive lock.
+    /// An error will be returned when the lock is acquired.
+    ///
+    /// # Panics
+    ///
+    /// This function might panic when called if the lock is already held by the current thread.
+    #[inline]
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn write(&self) -> LockResult<RwLockWriteGuard<T>> {
+        unsafe {
+            self.inner.write();
+            RwLockWriteGuard::new(self)
+        }
+    }
+
+    /// Attempts to lock this rwlock with exclusive write access.
+    ///
+    /// If the lock could not be acquired at this time, then `Err` is returned.
+    /// Otherwise, an RAII guard is returned which will release the lock when
+    /// it is dropped.
+    ///
+    /// This function does not block.
+    ///
+    /// This function does not provide any guarantees with respect to the ordering
+    /// of whether contentious readers or writers will acquire the lock first.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the RwLock is poisoned. An RwLock
+    /// is poisoned whenever a writer panics while holding an exclusive lock. An
+    /// error will only be returned if the lock would have otherwise been
+    /// acquired.
+    #[inline]
+    #[stable(feature = "rust1", since = "1.0.0")]
+    pub fn try_write(&self) -> TryLockResult<RwLockWriteGuard<T>> {
+        unsafe {
+            if self.inner.try_write() {
+                Ok(RwLockWriteGuard::new(self)?)
+            } else {
+                Err(TryLockError::WouldBlock)
+            }
+        }
+    }
+
+    /// Determines whether the lock is poisoned.
+    ///
+    /// If another thread is active, the lock can still become poisoned at any
+    /// time.  You should not trust a `false` value for program correctness
+    /// without additional synchronization.
+    #[inline]
+    #[stable(feature = "sync_poison", since = "1.2.0")]
+    pub fn is_poisoned(&self) -> bool {
+        self.poison.get()
+    }
+
+    /// Consumes this `RwLock`, returning the underlying data.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the RwLock is poisoned. An RwLock
+    /// is poisoned whenever a writer panics while holding an exclusive lock. An
+    /// error will only be returned if the lock would have otherwise been
+    /// acquired.
+    #[stable(feature = "rwlock_into_inner", since = "1.6.0")]
+    pub fn into_inner(self) -> LockResult<T> where T: Sized {
+        // We know statically that there are no outstanding references to
+        // `self` so there's no need to lock the inner lock.
+        //
+        // To get the inner value, we'd like to call `data.into_inner()`,
+        // but because `RwLock` impl-s `Drop`, we can't move out of it, so
+        // we'll have to destructure it manually instead.
+        unsafe {
+            // Like `let RwLock { inner, poison, data } = self`.
+            let (inner, poison, data) = {
+                let RwLock { ref inner, ref poison, ref data } = self;
+                (ptr::read(inner), ptr::read(poison), ptr::read(data))
+            };
+            mem::forget(self);
+            inner.destroy();  // Keep in sync with the `Drop` impl.
+            drop(inner);
+
+            poison::map_result(poison.borrow(), |_| data.into_inner())
+        }
+    }
+
+    /// Returns a mutable reference to the underlying data.
+    ///
+    /// Since this call borrows the `RwLock` mutably, no actual locking needs to
+    /// take place---the mutable borrow statically guarantees no locks exist.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if the RwLock is poisoned. An RwLock
+    /// is poisoned whenever a writer panics while holding an exclusive lock. An
+    /// error will only be returned if the lock would have otherwise been
+    /// acquired.
+    #[stable(feature = "rwlock_get_mut", since = "1.6.0")]
+    pub fn get_mut(&mut self) -> LockResult<&mut T> {
+        // We know statically that there are no other references to `self`, so
+        // there's no need to lock the inner lock.
+        let data = unsafe { &mut *self.data.get() };
+        poison::map_result(self.poison.borrow(), |_| data)
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+unsafe impl<#[may_dangle] T: ?Sized> Drop for RwLock<T> {
+    fn drop(&mut self) {
+        // IMPORTANT: This code needs to be kept in sync with `RwLock::into_inner`.
+        unsafe { self.inner.destroy() }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<T: ?Sized + fmt::Debug> fmt::Debug for RwLock<T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        match self.try_read() {
+            Ok(guard) => write!(f, "RwLock {{ data: {:?} }}", &*guard),
+            Err(TryLockError::Poisoned(err)) => {
+                write!(f, "RwLock {{ data: Poisoned({:?}) }}", &**err.get_ref())
+            },
+            Err(TryLockError::WouldBlock) => write!(f, "RwLock {{ <locked> }}")
+        }
+    }
+}
+
+#[stable(feature = "rw_lock_default", since = "1.9.0")]
+impl<T: Default> Default for RwLock<T> {
+    /// Creates a new `RwLock<T>`, with the `Default` value for T.
+    fn default() -> RwLock<T> {
+        RwLock::new(Default::default())
+    }
+}
+
+impl<'rwlock, T: ?Sized> RwLockReadGuard<'rwlock, T> {
+    unsafe fn new(lock: &'rwlock RwLock<T>)
+                  -> LockResult<RwLockReadGuard<'rwlock, T>> {
+        poison::map_result(lock.poison.borrow(), |_| {
+            RwLockReadGuard {
+                __lock: lock,
+            }
+        })
+    }
+}
+
+impl<'rwlock, T: ?Sized> RwLockWriteGuard<'rwlock, T> {
+    unsafe fn new(lock: &'rwlock RwLock<T>)
+                  -> LockResult<RwLockWriteGuard<'rwlock, T>> {
+        poison::map_result(lock.poison.borrow(), |guard| {
+            RwLockWriteGuard {
+                __lock: lock,
+                __poison: guard,
+            }
+        })
+    }
+}
+
+#[stable(feature = "std_debug", since = "1.16.0")]
+impl<'a, T: fmt::Debug> fmt::Debug for RwLockReadGuard<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("RwLockReadGuard")
+            .field("lock", &self.__lock)
+            .finish()
+    }
+}
+
+#[stable(feature = "std_debug", since = "1.16.0")]
+impl<'a, T: fmt::Debug> fmt::Debug for RwLockWriteGuard<'a, T> {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.debug_struct("RwLockWriteGuard")
+            .field("lock", &self.__lock)
+            .finish()
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'rwlock, T: ?Sized> Deref for RwLockReadGuard<'rwlock, T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        unsafe { &*self.__lock.data.get() }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'rwlock, T: ?Sized> Deref for RwLockWriteGuard<'rwlock, T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        unsafe { &*self.__lock.data.get() }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'rwlock, T: ?Sized> DerefMut for RwLockWriteGuard<'rwlock, T> {
+    fn deref_mut(&mut self) -> &mut T {
+        unsafe { &mut *self.__lock.data.get() }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a, T: ?Sized> Drop for RwLockReadGuard<'a, T> {
+    fn drop(&mut self) {
+        unsafe { self.__lock.inner.read_unlock(); }
+    }
+}
+
+#[stable(feature = "rust1", since = "1.0.0")]
+impl<'a, T: ?Sized> Drop for RwLockWriteGuard<'a, T> {
+    fn drop(&mut self) {
+        self.__lock.poison.done(&self.__poison);
+        unsafe { self.__lock.inner.write_unlock(); }
+    }
+}
+
+#[cfg(all(test, not(target_os = "emscripten")))]
+mod tests {
+    #![allow(deprecated)] // rand
+
+    use rand::{self, Rng};
+    use sync::mpsc::channel;
+    use thread;
+    use sync::{Arc, RwLock, TryLockError};
+    use sync::atomic::{AtomicUsize, Ordering};
+
+    #[derive(Eq, PartialEq, Debug)]
+    struct NonCopy(i32);
+
+    #[test]
+    fn smoke() {
+        let l = RwLock::new(());
+        drop(l.read().unwrap());
+        drop(l.write().unwrap());
+        drop((l.read().unwrap(), l.read().unwrap()));
+        drop(l.write().unwrap());
+    }
+
+    #[test]
+    fn frob() {
+        const N: usize = 10;
+        const M: usize = 1000;
+
+        let r = Arc::new(RwLock::new(()));
+
+        let (tx, rx) = channel::<()>();
+        for _ in 0..N {
+            let tx = tx.clone();
+            let r = r.clone();
+            thread::spawn(move || {
+                let mut rng = rand::thread_rng();
+                for _ in 0..M {
+                    if rng.gen_weighted_bool(N) {
+                        drop(r.write().unwrap());
+                    } else {
+                        drop(r.read().unwrap());
+                    }
+                }
+                drop(tx);
+            });
+        }
+        drop(tx);
+        let _ = rx.recv();
+    }
+
+    #[test]
+    fn test_rw_arc_poison_wr() {
+        let arc = Arc::new(RwLock::new(1));
+        let arc2 = arc.clone();
+        let _: Result<(), _> = thread::spawn(move|| {
+            let _lock = arc2.write().unwrap();
+            panic!();
+        }).join();
+        assert!(arc.read().is_err());
+    }
+
+    #[test]
+    fn test_rw_arc_poison_ww() {
+        let arc = Arc::new(RwLock::new(1));
+        assert!(!arc.is_poisoned());
+        let arc2 = arc.clone();
+        let _: Result<(), _> = thread::spawn(move|| {
+            let _lock = arc2.write().unwrap();
+            panic!();
+        }).join();
+        assert!(arc.write().is_err());
+        assert!(arc.is_poisoned());
+    }
+
+    #[test]
+    fn test_rw_arc_no_poison_rr() {
+        let arc = Arc::new(RwLock::new(1));
+        let arc2 = arc.clone();
+        let _: Result<(), _> = thread::spawn(move|| {
+            let _lock = arc2.read().unwrap();
+            panic!();
+        }).join();
+        let lock = arc.read().unwrap();
+        assert_eq!(*lock, 1);
+    }
+    #[test]
+    fn test_rw_arc_no_poison_rw() {
+        let arc = Arc::new(RwLock::new(1));
+        let arc2 = arc.clone();
+        let _: Result<(), _> = thread::spawn(move|| {
+            let _lock = arc2.read().unwrap();
+            panic!()
+        }).join();
+        let lock = arc.write().unwrap();
+        assert_eq!(*lock, 1);
+    }
+
+    #[test]
+    fn test_rw_arc() {
+        let arc = Arc::new(RwLock::new(0));
+        let arc2 = arc.clone();
+        let (tx, rx) = channel();
+
+        thread::spawn(move|| {
+            let mut lock = arc2.write().unwrap();
+            for _ in 0..10 {
+                let tmp = *lock;
+                *lock = -1;
+                thread::yield_now();
+                *lock = tmp + 1;
+            }
+            tx.send(()).unwrap();
+        });
+
+        // Readers try to catch the writer in the act
+        let mut children = Vec::new();
+        for _ in 0..5 {
+            let arc3 = arc.clone();
+            children.push(thread::spawn(move|| {
+                let lock = arc3.read().unwrap();
+                assert!(*lock >= 0);
+            }));
+        }
+
+        // Wait for children to pass their asserts
+        for r in children {
+            assert!(r.join().is_ok());
+        }
+
+        // Wait for writer to finish
+        rx.recv().unwrap();
+        let lock = arc.read().unwrap();
+        assert_eq!(*lock, 10);
+    }
+
+    #[test]
+    fn test_rw_arc_access_in_unwind() {
+        let arc = Arc::new(RwLock::new(1));
+        let arc2 = arc.clone();
+        let _ = thread::spawn(move|| -> () {
+            struct Unwinder {
+                i: Arc<RwLock<isize>>,
+            }
+            impl Drop for Unwinder {
+                fn drop(&mut self) {
+                    let mut lock = self.i.write().unwrap();
+                    *lock += 1;
+                }
+            }
+            let _u = Unwinder { i: arc2 };
+            panic!();
+        }).join();
+        let lock = arc.read().unwrap();
+        assert_eq!(*lock, 2);
+    }
+
+    #[test]
+    fn test_rwlock_unsized() {
+        let rw: &RwLock<[i32]> = &RwLock::new([1, 2, 3]);
+        {
+            let b = &mut *rw.write().unwrap();
+            b[0] = 4;
+            b[2] = 5;
+        }
+        let comp: &[i32] = &[4, 2, 5];
+        assert_eq!(&*rw.read().unwrap(), comp);
+    }
+
+    #[test]
+    fn test_rwlock_try_write() {
+        let lock = RwLock::new(0isize);
+        let read_guard = lock.read().unwrap();
+
+        let write_result = lock.try_write();
+        match write_result {
+            Err(TryLockError::WouldBlock) => (),
+            Ok(_) => assert!(false, "try_write should not succeed while read_guard is in scope"),
+            Err(_) => assert!(false, "unexpected error"),
+        }
+
+        drop(read_guard);
+    }
+
+    #[test]
+    fn test_into_inner() {
+        let m = RwLock::new(NonCopy(10));
+        assert_eq!(m.into_inner().unwrap(), NonCopy(10));
+    }
+
+    #[test]
+    fn test_into_inner_drop() {
+        struct Foo(Arc<AtomicUsize>);
+        impl Drop for Foo {
+            fn drop(&mut self) {
+                self.0.fetch_add(1, Ordering::SeqCst);
+            }
+        }
+        let num_drops = Arc::new(AtomicUsize::new(0));
+        let m = RwLock::new(Foo(num_drops.clone()));
+        assert_eq!(num_drops.load(Ordering::SeqCst), 0);
+        {
+            let _inner = m.into_inner().unwrap();
+            assert_eq!(num_drops.load(Ordering::SeqCst), 0);
+        }
+        assert_eq!(num_drops.load(Ordering::SeqCst), 1);
+    }
+
+    #[test]
+    fn test_into_inner_poison() {
+        let m = Arc::new(RwLock::new(NonCopy(10)));
+        let m2 = m.clone();
+        let _ = thread::spawn(move || {
+            let _lock = m2.write().unwrap();
+            panic!("test panic in inner thread to poison RwLock");
+        }).join();
+
+        assert!(m.is_poisoned());
+        match Arc::try_unwrap(m).unwrap().into_inner() {
+            Err(e) => assert_eq!(e.into_inner(), NonCopy(10)),
+            Ok(x) => panic!("into_inner of poisoned RwLock is Ok: {:?}", x),
+        }
+    }
+
+    #[test]
+    fn test_get_mut() {
+        let mut m = RwLock::new(NonCopy(10));
+        *m.get_mut().unwrap() = NonCopy(20);
+        assert_eq!(m.into_inner().unwrap(), NonCopy(20));
+    }
+
+    #[test]
+    fn test_get_mut_poison() {
+        let m = Arc::new(RwLock::new(NonCopy(10)));
+        let m2 = m.clone();
+        let _ = thread::spawn(move || {
+            let _lock = m2.write().unwrap();
+            panic!("test panic in inner thread to poison RwLock");
+        }).join();
+
+        assert!(m.is_poisoned());
+        match Arc::try_unwrap(m).unwrap().get_mut() {
+            Err(e) => assert_eq!(*e.into_inner(), NonCopy(10)),
+            Ok(x) => panic!("get_mut of poisoned RwLock is Ok: {:?}", x),
+        }
+    }
+}

ctr-std/src/sys/unix/condvar.rs

@@ -0,0 +1,111 @@
+// Copyright 2016 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.
+
+// *Implementation adapted from `/sys/redox/condvar.rs`
+
+use cell::UnsafeCell;
+use intrinsics::atomic_cxchg;
+use ptr;
+use time::Duration;
+
+use sys::mutex::{self, Mutex};
+
+use libctru::synchronization::{__sync_get_arbiter, LightLock};
+use libctru::svc::{svcArbitrateAddress, ArbitrationType};
+
+pub struct Condvar {
+    lock: UnsafeCell<*mut LightLock>,
+}
+
+unsafe impl Send for Condvar {}
+unsafe impl Sync for Condvar {}
+
+impl Condvar {
+    pub const fn new() -> Condvar {
+        Condvar {
+            lock: UnsafeCell::new(ptr::null_mut()),
+        }
+    }
+
+    #[inline]
+    pub unsafe fn init(&self) {
+        *self.lock.get() = ptr::null_mut();
+    }
+
+    #[inline]
+    pub fn notify_one(&self) {
+        unsafe {
+            let arbiter = __sync_get_arbiter();
+
+            svcArbitrateAddress(arbiter,
+                                *self.lock.get() as u32,
+                                ArbitrationType::ARBITRATION_SIGNAL,
+                                1,
+                                0);
+        }
+    }
+
+    #[inline]
+    pub fn notify_all(&self) {
+        unsafe {
+            let lock = self.lock.get();
+
+            if *lock == ptr::null_mut() {
+                return;
+            }
+
+            let arbiter = __sync_get_arbiter();
+
+            svcArbitrateAddress(arbiter,
+                                *self.lock.get() as u32,
+                                ArbitrationType::ARBITRATION_SIGNAL,
+                                -1,
+                                0);
+        }
+    }
+
+    #[inline]
+    pub fn wait(&self, mutex: &Mutex) {
+        unsafe {
+            let lock = self.lock.get();
+
+            if *lock != mutex::raw(mutex) {
+                if *lock != ptr::null_mut() {
+                    panic!("Condvar used with more than one Mutex");
+                }
+                
+                atomic_cxchg(lock as *mut usize, 0, mutex::raw(mutex) as usize);
+            }
+
+            mutex.unlock();
+
+            let arbiter = __sync_get_arbiter();
+
+            svcArbitrateAddress(arbiter,
+                                *self.lock.get() as u32,
+                                ArbitrationType::ARBITRATION_WAIT_IF_LESS_THAN,
+                                0,
+                                0);
+
+            mutex.lock();
+        }
+    }
+
+    #[inline]
+    pub fn wait_timeout(&self, _mutex: &Mutex, _dur: Duration) -> bool {
+        ::sys_common::util::dumb_print(format_args!("condvar wait_timeout\n"));
+        unimplemented!();
+    }
+
+    #[inline]
+    pub unsafe fn destroy(&self) {
+        *self.lock.get() = ptr::null_mut();
+    }
+}

ctr-std/src/sys/unix/mod.rs

@@ -13,6 +13,7 @@
 use io::{self, ErrorKind};
 use libc;
 
+pub mod condvar;
 pub mod ext;
 pub mod fast_thread_local;
 pub mod fd;
@@ -22,6 +23,8 @@ pub mod mutex;
 pub mod os;
 pub mod os_str;
 pub mod path;
+pub mod rwlock;
+pub mod thread;
 pub mod thread_local;
 pub mod time;
 

ctr-std/src/sys/unix/rwlock.rs

@@ -0,0 +1,61 @@
+// Copyright 2016 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 super::mutex::Mutex;
+
+pub struct RWLock {
+    mutex: Mutex
+}
+
+unsafe impl Send for RWLock {}
+unsafe impl Sync for RWLock {}
+
+impl RWLock {
+    pub const fn new() -> RWLock {
+        RWLock {
+            mutex: Mutex::new()
+        }
+    }
+
+    #[inline]
+    pub unsafe fn read(&self) {
+        self.mutex.lock();
+    }
+
+    #[inline]
+    pub unsafe fn try_read(&self) -> bool {
+        self.mutex.try_lock()
+    }
+
+    #[inline]
+    pub unsafe fn write(&self) {
+        self.mutex.lock();
+    }
+
+    #[inline]
+    pub unsafe fn try_write(&self) -> bool {
+        self.mutex.try_lock()
+    }
+
+    #[inline]
+    pub unsafe fn read_unlock(&self) {
+        self.mutex.unlock();
+    }
+
+    #[inline]
+    pub unsafe fn write_unlock(&self) {
+        self.mutex.unlock();
+    }
+
+    #[inline]
+    pub unsafe fn destroy(&self) {
+        self.mutex.destroy();
+    }
+}

ctr-std/src/sys/unix/thread.rs

@@ -0,0 +1,90 @@
+// Copyright 2016 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 alloc::boxed::FnBox;
+use libc;
+use cmp;
+use ffi::CStr;
+use io;
+use mem;
+use ptr;
+use sys_common::thread::start_thread;
+use time::Duration;
+
+use libctru::svc::svcSleepThread;
+use libctru::thread::{threadCreate, threadJoin, threadFree};
+use libctru::thread::Thread as ThreadHandle;
+
+pub struct Thread {
+    handle: ThreadHandle,
+}
+
+// Some platforms may have pthread_t as a pointer in which case we still want
+// a thread to be Send/Sync
+unsafe impl Send for Thread {}
+unsafe impl Sync for Thread {}
+
+impl Thread {
+    pub unsafe fn new<'a>(stack: usize, p: Box<FnBox() + 'a>) -> io::Result<Thread> {
+        let p = box p;
+        let stack_size = cmp::max(stack, 4 * 1024);
+
+        let handle = threadCreate(Some(thread_func), &*p as *const _ as *mut _,
+                                  stack_size, 0x29, -2, 0);
+
+        return if handle == ptr::null_mut() {
+            Err(io::Error::from_raw_os_error(libc::EAGAIN))
+        } else {
+            mem::forget(p); // ownership passed to the new thread
+            Ok(Thread { handle: handle })
+        };
+
+        extern "C" fn thread_func(start: *mut libc::c_void) {
+            unsafe { start_thread(start) }
+        }
+    }
+
+    pub fn yield_now() {
+        unimplemented!()
+    }
+
+    pub fn set_name(_name: &CStr) {
+        // can't set thread names on the 3DS
+    }
+
+    pub fn sleep(dur: Duration) {
+        unsafe {
+            let nanos = dur.as_secs() * 1_000_000_000 + dur.subsec_nanos() as u64;
+            svcSleepThread(nanos as i64)
+        }
+    }
+
+    pub fn join(self) {
+        unsafe {
+            let ret = threadJoin(self.handle, u64::max_value());
+            threadFree(self.handle);
+            mem::forget(self);
+            debug_assert_eq!(ret, 0);
+        }
+    }
+
+    pub fn id(&self) -> usize {
+        unimplemented!()
+    }
+
+    pub fn into_id(self) -> usize {
+        unimplemented!()
+    }
+}
+
+pub mod guard {
+    pub unsafe fn current() -> Option<usize> { None }
+    pub unsafe fn init() -> Option<usize> { None }
+}

ctr-std/src/sys_common/condvar.rs

@@ -0,0 +1,70 @@
+// Copyright 2014 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 time::Duration;
+use sys_common::mutex::{self, Mutex};
+use sys::condvar as imp;
+
+/// An OS-based condition variable.
+///
+/// This structure is the lowest layer possible on top of the OS-provided
+/// condition variables. It is consequently entirely unsafe to use. It is
+/// recommended to use the safer types at the top level of this crate instead of
+/// this type.
+pub struct Condvar(imp::Condvar);
+
+impl Condvar {
+    /// Creates a new condition variable for use.
+    ///
+    /// Behavior is undefined if the condition variable is moved after it is
+    /// first used with any of the functions below.
+    pub const fn new() -> Condvar { Condvar(imp::Condvar::new()) }
+
+    /// Prepares the condition variable for use.
+    ///
+    /// This should be called once the condition variable is at a stable memory
+    /// address.
+    #[inline]
+    pub unsafe fn init(&mut self) { self.0.init() }
+
+    /// Signals one waiter on this condition variable to wake up.
+    #[inline]
+    pub unsafe fn notify_one(&self) { self.0.notify_one() }
+
+    /// Awakens all current waiters on this condition variable.
+    #[inline]
+    pub unsafe fn notify_all(&self) { self.0.notify_all() }
+
+    /// Waits for a signal on the specified mutex.
+    ///
+    /// Behavior is undefined if the mutex is not locked by the current thread.
+    /// Behavior is also undefined if more than one mutex is used concurrently
+    /// on this condition variable.
+    #[inline]
+    pub unsafe fn wait(&self, mutex: &Mutex) { self.0.wait(mutex::raw(mutex)) }
+
+    /// Waits for a signal on the specified mutex with a timeout duration
+    /// specified by `dur` (a relative time into the future).
+    ///
+    /// Behavior is undefined if the mutex is not locked by the current thread.
+    /// Behavior is also undefined if more than one mutex is used concurrently
+    /// on this condition variable.
+    #[inline]
+    pub unsafe fn wait_timeout(&self, mutex: &Mutex, dur: Duration) -> bool {
+        self.0.wait_timeout(mutex::raw(mutex), dur)
+    }
+
+    /// Deallocates all resources associated with this condition variable.
+    ///
+    /// Behavior is undefined if there are current or will be future users of
+    /// this condition variable.
+    #[inline]
+    pub unsafe fn destroy(&self) { self.0.destroy() }
+}

ctr-std/src/sys_common/mod.rs

@@ -25,11 +25,16 @@
 #![allow(missing_docs)]
 
 pub mod at_exit_imp;
+pub mod condvar;
 pub mod io;
 pub mod mutex;
 pub mod poison;
 pub mod remutex;
+pub mod rwlock;
+pub mod thread;
+pub mod thread_info;
 pub mod thread_local;
+pub mod util;
 
 // common error constructors
 

ctr-std/src/sys_common/rwlock.rs

@@ -0,0 +1,82 @@
+// Copyright 2014 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 sys::rwlock as imp;
+
+/// An OS-based reader-writer lock.
+///
+/// This structure is entirely unsafe and serves as the lowest layer of a
+/// cross-platform binding of system rwlocks. It is recommended to use the
+/// safer types at the top level of this crate instead of this type.
+pub struct RWLock(imp::RWLock);
+
+impl RWLock {
+    /// Creates a new reader-writer lock for use.
+    ///
+    /// Behavior is undefined if the reader-writer lock is moved after it is
+    /// first used with any of the functions below.
+    pub const fn new() -> RWLock { RWLock(imp::RWLock::new()) }
+
+    /// Acquires shared access to the underlying lock, blocking the current
+    /// thread to do so.
+    ///
+    /// Behavior is undefined if the rwlock has been moved between this and any
+    /// previous method call.
+    #[inline]
+    pub unsafe fn read(&self) { self.0.read() }
+
+    /// Attempts to acquire shared access to this lock, returning whether it
+    /// succeeded or not.
+    ///
+    /// This function does not block the current thread.
+    ///
+    /// Behavior is undefined if the rwlock has been moved between this and any
+    /// previous method call.
+    #[inline]
+    pub unsafe fn try_read(&self) -> bool { self.0.try_read() }
+
+    /// Acquires write access to the underlying lock, blocking the current thread
+    /// to do so.
+    ///
+    /// Behavior is undefined if the rwlock has been moved between this and any
+    /// previous method call.
+    #[inline]
+    pub unsafe fn write(&self) { self.0.write() }
+
+    /// Attempts to acquire exclusive access to this lock, returning whether it
+    /// succeeded or not.
+    ///
+    /// This function does not block the current thread.
+    ///
+    /// Behavior is undefined if the rwlock has been moved between this and any
+    /// previous method call.
+    #[inline]
+    pub unsafe fn try_write(&self) -> bool { self.0.try_write() }
+
+    /// Unlocks previously acquired shared access to this lock.
+    ///
+    /// Behavior is undefined if the current thread does not have shared access.
+    #[inline]
+    pub unsafe fn read_unlock(&self) { self.0.read_unlock() }
+
+    /// Unlocks previously acquired exclusive access to this lock.
+    ///
+    /// Behavior is undefined if the current thread does not currently have
+    /// exclusive access.
+    #[inline]
+    pub unsafe fn write_unlock(&self) { self.0.write_unlock() }
+
+    /// Destroys OS-related resources with this RWLock.
+    ///
+    /// Behavior is undefined if there are any currently active users of this
+    /// lock.
+    #[inline]
+    pub unsafe fn destroy(&self) { self.0.destroy() }
+}

ctr-std/src/sys_common/thread.rs

@@ -0,0 +1,22 @@
+// Copyright 2014 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 alloc::boxed::FnBox;
+use libc;
+//use sys::stack_overflow;
+
+pub unsafe fn start_thread(main: *mut libc::c_void) {
+    // Next, set up our stack overflow handler which may get triggered if we run
+    // out of stack.
+    // let _handler = stack_overflow::Handler::new();
+
+    // Finally, let's run some code.
+    Box::from_raw(main as *mut Box<FnBox()>)()
+}

ctr-std/src/sys_common/thread_info.rs

@@ -0,0 +1,61 @@
+// Copyright 2014 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.
+
+#![allow(dead_code)] // stack_guard isn't used right now on all platforms
+
+use cell::RefCell;
+use thread::Thread;
+use thread::LocalKeyState;
+
+struct ThreadInfo {
+    stack_guard: Option<usize>,
+    thread: Thread,
+}
+
+thread_local! { static THREAD_INFO: RefCell<Option<ThreadInfo>> = RefCell::new(None) }
+
+impl ThreadInfo {
+    fn with<R, F>(f: F) -> Option<R> where F: FnOnce(&mut ThreadInfo) -> R {
+        if THREAD_INFO.state() == LocalKeyState::Destroyed {
+            return None
+        }
+
+        THREAD_INFO.with(move |c| {
+            if c.borrow().is_none() {
+                *c.borrow_mut() = Some(ThreadInfo {
+                    stack_guard: None,
+                    thread: NewThread::new(None),
+                })
+            }
+            Some(f(c.borrow_mut().as_mut().unwrap()))
+        })
+    }
+}
+
+pub fn current_thread() -> Option<Thread> {
+    ThreadInfo::with(|info| info.thread.clone())
+}
+
+pub fn stack_guard() -> Option<usize> {
+    ThreadInfo::with(|info| info.stack_guard).and_then(|o| o)
+}
+
+pub fn set(stack_guard: Option<usize>, thread: Thread) {
+    THREAD_INFO.with(|c| assert!(c.borrow().is_none()));
+    THREAD_INFO.with(move |c| *c.borrow_mut() = Some(ThreadInfo{
+        stack_guard: stack_guard,
+        thread: thread,
+    }));
+}
+
+// a hack to get around privacy restrictions; implemented by `std::thread`
+pub trait NewThread {
+    fn new(name: Option<String>) -> Self;
+}

ctr-std/src/sys_common/util.rs

@@ -0,0 +1,49 @@
+// 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 fmt;
+use io::prelude::*;
+use sync::atomic::{self, Ordering};
+use sys::stdio::Stderr;
+
+pub fn min_stack() -> usize {
+    static MIN: atomic::AtomicUsize = atomic::AtomicUsize::new(0);
+    match MIN.load(Ordering::SeqCst) {
+        0 => {}
+        n => return n - 1,
+    }
+
+	// NOTE: We don't have env variable support on the 3DS so let's just use the
+	// default minimum
+
+    // let amt = env::var("RUST_MIN_STACK").ok().and_then(|s| s.parse().ok());
+    // let amt = amt.unwrap_or(2 * 1024 * 1024);
+
+	let amt = 2 * 1024 * 1024;
+
+    // 0 is our sentinel value, so ensure that we'll never see 0 after
+    // initialization has run
+    MIN.store(amt + 1, Ordering::SeqCst);
+    amt
+}
+
+pub fn dumb_print(args: fmt::Arguments) {
+    let _ = Stderr::new().map(|mut stderr| stderr.write_fmt(args));
+}
+
+// Other platforms should use the appropriate platform-specific mechanism for
+// aborting the process.  If no platform-specific mechanism is available,
+// ::intrinsics::abort() may be used instead.  The above implementations cover
+// all targets currently supported by libstd.
+
+pub fn abort(args: fmt::Arguments) -> ! {
+    dumb_print(format_args!("fatal runtime error: {}\n", args));
+    unsafe { ::sys::abort_internal(); }
+}