auto merge of #10965 : alexcrichton/rust/libgreen, r=brson

This pull request extracts all scheduling functionality from libstd, moving it into its own separate crates. The new libnative and libgreen will be the new way in which 1:1 and M:N scheduling is implemented. The standard library still requires an interface to the runtime, however, (think of things like `std::comm` and `io::println`). The interface is now defined by the `Runtime` trait inside of `std::rt`.

The booting process is now that libgreen defines the start lang-item and that's it. I want to extend this soon to have libnative also have a "start lang item" but also allow libgreen and libnative to be linked together in the same process. For now though, only libgreen can be used to start a program (unless you define the start lang item yourself). Again though, I want to change this soon, I just figured that this pull request is large enough as-is.

This certainly wasn't a smooth transition, certain functionality has no equivalent in this new separation, and some functionality is now better enabled through this new system. I did my best to separate all of the commits by topic and keep things fairly bite-sized, although are indeed larger than others.

As a note, this is currently rebased on top of my `std::comm` rewrite (or at least an old copy of it), but none of those commits need reviewing (that will all happen in another pull request).

1 files changed, 0 insertions, 78 deletions

diff --git a/src/libstd/rt/stack.rs b/src/libstd/rt/stack.rs
deleted file mode 100644
index 44b60e955d2..00000000000
--- a/src/libstd/rt/stack.rs
+++ /dev/null
@@ -1,78 +0,0 @@
-// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-use container::Container;
-use ptr::RawPtr;
-use vec;
-use ops::Drop;
-use libc::{c_uint, uintptr_t};
-
-pub struct StackSegment {
-    priv buf: ~[u8],
-    priv valgrind_id: c_uint
-}
-
-impl StackSegment {
-    pub fn new(size: uint) -> StackSegment {
-        unsafe {
-            // Crate a block of uninitialized values
-            let mut stack = vec::with_capacity(size);
-            stack.set_len(size);
-
-            let mut stk = StackSegment {
-                buf: stack,
-                valgrind_id: 0
-            };
-
-            // XXX: Using the FFI to call a C macro. Slow
-            stk.valgrind_id = rust_valgrind_stack_register(stk.start(), stk.end());
-            return stk;
-        }
-    }
-
-    /// Point to the low end of the allocated stack
-    pub fn start(&self) -> *uint {
-        self.buf.as_ptr() as *uint
-    }
-
-    /// Point one word beyond the high end of the allocated stack
-    pub fn end(&self) -> *uint {
-        unsafe {
-            self.buf.as_ptr().offset(self.buf.len() as int) as *uint
-        }
-    }
-}
-
-impl Drop for StackSegment {
-    fn drop(&mut self) {
-        unsafe {
-            // XXX: Using the FFI to call a C macro. Slow
-            rust_valgrind_stack_deregister(self.valgrind_id);
-        }
-    }
-}
-
-pub struct StackPool(());
-
-impl StackPool {
-    pub fn new() -> StackPool { StackPool(()) }
-
-    fn take_segment(&self, min_size: uint) -> StackSegment {
-        StackSegment::new(min_size)
-    }
-
-    fn give_segment(&self, _stack: StackSegment) {
-    }
-}
-
-extern {
-    fn rust_valgrind_stack_register(start: *uintptr_t, end: *uintptr_t) -> c_uint;
-    fn rust_valgrind_stack_deregister(id: c_uint);
-}