Fix scheduler interface

redGrapes/scheduler/pool_scheduler.hpp

@@ -47,7 +47,7 @@ namespace redGrapes
              *
              * @return true if thread was indeed asleep
              */
-            bool wake(WakerId id = 0);
+            bool wake(WakerId id);
 
             /* wakeup all workers
              */

redGrapes/scheduler/scheduler.hpp

@@ -37,20 +37,20 @@ namespace redGrapes
             }
 
             //! add task to the set of to-initialize tasks
-            virtual void emplace_task(TTask& task)
+            virtual void emplace_task(TTask&)
             {
             }
 
             //! add task to ready set
-            virtual void activate_task(TTask& task)
+            virtual void activate_task(TTask&)
             {
             }
 
             virtual void wake_all()
             {
             }
 
-            virtual bool wake(WakerId id = 0)
+            virtual bool wake(WakerId)
             {
                 return false;
             }
@@ -61,7 +61,7 @@ namespace redGrapes
             }
 
             // initialize the execution context pointed to by the scheduler
-            virtual void init()
+            virtual void init(WorkerId)
             {
             }