Enabled workstealing in the scheduler. Previously we had one global work queue shared by each scheduler. Now there is a separate work queue for each scheduler, and work is "stolen" from other queues when it is exhausted locally.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/libstd/rt/comm.rs b/src/libstd/rt/comm.rs
index 0cf223f3029..33b4b307af8 100644
--- a/src/libstd/rt/comm.rs
+++ b/src/libstd/rt/comm.rs
@@ -225,9 +225,10 @@ impl<T> Select for PortOne<T> {
     fn optimistic_check(&mut self) -> bool {
         // The optimistic check is never necessary for correctness. For testing
         // purposes, making it randomly return false simulates a racing sender.
-        use rand::{Rand, rng};
-        let mut rng = rng();
-        let actually_check = Rand::rand(&mut rng);
+        use rand::{Rand};
+        let actually_check = do Local::borrow::<Scheduler, bool> |sched| {
+            Rand::rand(&mut sched.rng)
+        };
         if actually_check {
             unsafe { (*self.packet()).state.load(Acquire) == STATE_ONE }
         } else {