add mlfqs condition checking in synchronisation primitives

src/threads/synch.c

@@ -251,6 +251,10 @@ lock_acquire (struct lock *lock)
   ASSERT (!lock_held_by_current_thread (lock));
 
   struct thread *t = thread_current ();
+
+  if(!thread_mlfqs)
+  {
+
       enum intr_level old_level = intr_disable ();
 
       if (lock->holder != NULL)
@@ -260,9 +264,13 @@ lock_acquire (struct lock *lock)
       }
 
       intr_set_level (old_level);
+  }
+
+
 
   sema_down (&lock->semaphore);
   lock->holder = thread_current ();
+  if (!thread_mlfqs)
     t->waiting_lock = NULL;
 }
 
@@ -297,6 +305,8 @@ lock_release (struct lock *lock)
   ASSERT (lock != NULL);
   ASSERT (lock_held_by_current_thread (lock));
 
+  if (!thread_mlfqs)
+  {
     struct thread *current_thread = thread_current ();
     struct thread *max_donor = NULL;
 
@@ -341,6 +351,7 @@ lock_release (struct lock *lock)
     /* Removal of donors to this thread may change its effective priority,
        so recalculate. */
     thread_recalculate_priority ();
+  }
 
   lock->holder = NULL;
   sema_up (&lock->semaphore);

src/threads/thread.c

@@ -474,6 +474,12 @@ thread_recalculate_priority (void)
 {
   struct thread *t = thread_current ();
 
+  if (thread_mlfqs)
+  {
+    t->priority = calculate_bsd_priority (t->recent_cpu, t->nice);
+    return;
+  }
+  
   enum intr_level old_level = intr_disable ();
   t->priority = t->base_priority;