Implement a basic event loop built on LittleLock

It's not guaranteed that there will always be an event loop to run, and this
implementation will serve as an incredibly basic one which does not provide any
I/O, but allows the scheduler to still run.

cc #9128

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!()
     }
 }