auto merge of #10054 : alexcrichton/rust/basic-event-loop, r=brson

This is more progress towards #9128 and all its related tree of issues. This implements a new `BasicLoop` on top of pthreads synchronization primitives (wrapped in `LittleLock`). This also removes the wonky `callback_ms` function from the interface of the event loop.

After #9901 is taking forever to land, I'm going to try to do all this runtime work in much smaller chunks than before. Right now this will not work unless #9901 lands first, but I'm close to landing it (hopefully), and I wanted to go ahead and get this reviewed before throwing it at bors later on down the road.

This "pausible idle callback" is also a bit of a weird idea, but it wasn't as difficult to implement as callback_ms so I'm more semi-ok with it.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/libstd/rt/io/mod.rs b/src/libstd/rt/io/mod.rs
index 758c9779165..decf801d592 100644
--- a/src/libstd/rt/io/mod.rs
+++ b/src/libstd/rt/io/mod.rs
@@ -606,6 +606,13 @@ pub fn standard_error(kind: IoErrorKind) -> IoError {
                 detail: None
             }
         }
+        IoUnavailable => {
+            IoError {
+                kind: IoUnavailable,
+                desc: "I/O is unavailable",
+                detail: None
+            }
+        }
         _ => fail!()
     }
 }