Auto merge of #36948 - brson:sys, r=brson

More refactoring to obey platform abstraction lint

The most interesting things here are moving `std/sys/common` to `std/sys_common`, and `std/num/{f32,f64}.rs` to `std/{f32,f64}.rs`, and adding more documentation to `std/lib.rs`.

r? @alexcrichton

1 files changed, 22 insertions, 0 deletions

diff --git a/src/libstd/sys_common/thread.rs b/src/libstd/sys_common/thread.rs
new file mode 100644
index 00000000000..3ee160da5fa
--- /dev/null
+++ b/src/libstd/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()>)()
+}