September 2017 Update

Task/Active-object/Zkl/active-object-1.zkl

@@ -0,0 +1,19 @@
+class Integrator{
+   // continuously integrate a function `K`, at each `interval` seconds'
+   fcn init(f,interval=1e-4){
+      var _interval=interval, K=Ref(f), S=Ref(0.0), run=True;
+      self.launch();  // start me as a thread
+   }
+   fcn liftoff{ // entry point for the thread
+      start:=Time.Clock.timef;  // floating point seconds since Epoch
+      t0,k0,s:=0,K.value(0),S.value;
+      while(run){
+	 Atomic.sleep(_interval);
+	 t1,k1:=Time.Clock.timef - start, K.value(t1);
+	 s+=(k1 + k0)*(t1 - t0)/2.0; S.set(s);
+	 t0,k0=t1,k1;
+      }
+   }
+   fcn sample  { S.value  }
+   fcn setF(f) { K.set(f) }
+}

Task/Active-object/Zkl/active-object-2.zkl

@@ -0,0 +1,7 @@
+ai:=Integrator(fcn(t){ ((0.0).pi*t).sin() });
+Atomic.sleep(2);
+ai.sample().println();
+
+ai.setF(fcn{ 0 });
+Atomic.sleep(0.5);
+ai.sample().println();