PROPOSAL: discard values if the queue is full

Author: facchinm

Diff for: Arduino_Threads.h

@@ -14,9 +14,11 @@ class Shared // template definition
       }
     }
     T& operator= (const T& other) {
-      val = other;
-      T* obj = new T(val);
-      queue->put(obj);
+      if (!queue->full()) {
+        val = other;
+        T* obj = new T(val);
+        queue->put(obj);
+      }
     }
     T& peek() {
       return val;