Add links to original mpmc and mpsc implementations

src/libstd/rt/mpmc_bounded_queue.rs

@@ -26,6 +26,8 @@
  * policies, either expressed or implied, of Dmitry Vyukov.
  */
 
+// http://www.1024cores.net/home/lock-free-algorithms/queues/bounded-mpmc-queue
+
 use unstable::sync::UnsafeArc;
 use unstable::atomics::{AtomicUint,Relaxed,Release,Acquire};
 use option::*;

src/libstd/rt/mpsc_queue.rs

@@ -27,6 +27,7 @@
  */
 
 //! A mostly lock-free multi-producer, single consumer queue.
+// http://www.1024cores.net/home/lock-free-algorithms/queues/intrusive-mpsc-node-based-queue
 
 use unstable::sync::UnsafeArc;
 use unstable::atomics::{AtomicPtr,Relaxed,Release,Acquire};