diff --git a/main.cc b/main.cc
index ea987ff..dc6f792 100644
--- a/main.cc
+++ b/main.cc
@@ -20,7 +20,7 @@
 #include "arch/context.h"
 #include "thread/thread.h"
 
-///TextStream kout = TextStream(0, 80, 0, 10, true);
+TextStream kout = TextStream(0, 80, 0, 10, true);
 Ticketlock koutlock;
 //Scheduler sch;
 
diff --git a/sync/semaphore.cc b/sync/semaphore.cc
index 7ee3142..071b8b9 100644
--- a/sync/semaphore.cc
+++ b/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++;
 }
 
diff --git a/user/app1/appl.cc b/user/app1/appl.cc
index 690bdb7..a04283e 100644
--- a/user/app1/appl.cc
+++ b/user/app1/appl.cc
@@ -9,9 +9,9 @@
 #include "../../interrupt/guard.h"
 #include "../../debug/output.h"
 #include "../../arch/context.h"
-
+#include "../../sync/semaphore.h"
 static uint8_t appl_cnt = 0;
-
+extern TextStream kout;
 char text[] = "Ich mag\n\
 Saftige Pflaumen voller Aroma\n\
 Ich knuddel jede Oma ins Koma\n\
@@ -33,18 +33,21 @@ void activeWaitDelay(uint64_t cycles) {
 		//Core::pause();
     }
 }
+Semaphore  foo= Semaphore(1);
 
 void Application::action() {  // NOLINT
 	uint16_t cnt = 0;
 	uint8_t row = appl_cnt++;
 	while (1) {
+		Guarded g= Guard::enter();
+
 		//koutlock.lock();
 		{
-			Guarded g = Guard::enter();
 			//g.vault();
-			g.vault().kout.setPos((unsigned)8*row,(unsigned)/*Core::getID()*2+*/1);
-			g.vault().kout << cnt++ << flush;
-
+			foo.p(g.vault());	
+			kout.setPos((unsigned)8*row,(unsigned)/*Core::getID()*2+*/1);
+			kout << cnt++ << flush;
+			foo.v(g.vault());
 			//g.vault().kout << endl << flush;
 			//Guard::leave();
 			//koutlock.unlock();