hopefully added semaphores

sync/semaphore.cc

@@ -12,17 +12,18 @@ void Semaphore::p(Vault &vault) {
   //resource is frei, läuft direkt weiter
   if (vault.counter > 0)
     vault.counter--;
-  //else
-  /// thread block, zu aktueller queue hinzufügen und 
-//    vault.sch.block(this);
+  else
+  //thread block, zu aktueller queue hinzufügen und 
+    waiting.enqueue(*vault.sch.active());  //was is der calling thread
+                                           //
 }
 
 //release
 void Semaphore::v(Vault &vault) { 
-  //Thread* first = waiting.dequeue();
-  //if (first != nullptr)
-  //  void Scheduler::wakeup(first);
-  //else
+  Thread* first = waiting.dequeue();
+  if (first != nullptr)
+    vault.sch.ready(first);   //wakeup "first" thread
+  else
     vault.counter++;
 }