Add tasks for all the new languages

Task/Active-object/Swift/active-object.swift

@@ -0,0 +1,65 @@
+// For NSObject, NSTimeInterval and NSThread
+import Foundation
+// For PI and sin
+import Darwin
+
+class ActiveObject:NSObject {
+
+    let sampling = 0.1
+    var K: (t: NSTimeInterval) -> Double
+    var S: Double
+    var t0, t1: NSTimeInterval
+    var thread = NSThread()
+
+    func integrateK() {
+        t0 = t1
+        t1 += sampling
+        S += (K(t:t1) + K(t: t0)) * (t1 - t0) / 2
+    }
+
+    func updateObject() {
+        while true {
+            integrateK()
+            usleep(100000)
+        }
+    }
+
+    init(function: (NSTimeInterval) -> Double) {
+        S = 0
+        t0 = 0
+        t1 = 0
+        K = function
+        super.init()
+        thread = NSThread(target: self, selector: "updateObject", object: nil)
+        thread.start()
+    }
+
+    func Input(function: (NSTimeInterval) -> Double) {
+        K = function
+
+    }
+
+    func Output() -> Double {
+        return S
+    }
+
+}
+
+// main
+func sine(t: NSTimeInterval) -> Double {
+    let f = 0.5
+
+    return sin(2 * M_PI * f * t)
+}
+
+var activeObject = ActiveObject(function: sine)
+
+var date = NSDate()
+
+sleep(2)
+
+activeObject.Input({(t: NSTimeInterval) -> Double in return 0.0})
+
+usleep(500000)
+
+println(activeObject.Output())