Add tasks for all the new languages

Task/Synchronous-concurrency/Swift/synchronous-concurrency-1.swift

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+//
+//  Reader.swift
+//
+
+import Foundation
+
+class Reader: NSObject {
+    let inputPath = "~/Desktop/input.txt".stringByExpandingTildeInPath
+    var gotNumberOfLines = false
+
+    override init() {
+        super.init()
+        NSNotificationCenter.defaultCenter().addObserver(self, selector: "linesPrinted:",
+            name: "LinesPrinted", object: nil)
+    }
+
+    deinit {
+        NSNotificationCenter.defaultCenter().removeObserver(self)
+    }
+
+    // Selector for the number of lines printed
+    func linesPrinted(not:NSNotification) {
+        println(not.object!)
+        self.gotNumberOfLines = true
+        exit(0)
+    }
+
+    func readFile() {
+        var err:NSError?
+        let fileString = NSString(contentsOfFile: self.inputPath,
+            encoding: NSUTF8StringEncoding, error: &err)
+
+        if let lines = fileString?.componentsSeparatedByString("\n") {
+            for line in lines {
+                NSNotificationCenter.defaultCenter().postNotificationName("Line", object: line)
+            }
+            NSNotificationCenter.defaultCenter().postNotificationName("LineNumberRequest", object: nil)
+
+            while !self.gotNumberOfLines {
+                sleep(1 as UInt32)
+            }
+        }
+    }
+}

Task/Synchronous-concurrency/Swift/synchronous-concurrency-2.swift

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+//
+//  Printer.swift
+//
+
+import Foundation
+
+class Printer: NSObject {
+    var numberOfLines = 0
+    var gotRequestLineNumber = false
+
+    override init() {
+        super.init()
+        NSNotificationCenter.defaultCenter().addObserver(self, selector: "gotLine:",
+            name: "Line", object: nil)
+        NSNotificationCenter.defaultCenter().addObserver(self, selector: "lineNumberRequest:",
+            name: "LineNumberRequest", object: nil)
+    }
+
+    deinit {
+        NSNotificationCenter.defaultCenter().removeObserver(self)
+    }
+
+    func gotLine(not:NSNotification) {
+        println(not.object!)
+        self.numberOfLines++
+    }
+
+    func lineNumberRequest(not:NSNotification) {
+        self.gotRequestLineNumber = true
+        NSNotificationCenter.defaultCenter().postNotificationName("LinesPrinted", object: self.numberOfLines)
+    }
+
+    func waitForLines() {
+        while !self.gotRequestLineNumber {
+            sleep(1 as UInt32)
+        }
+    }
+}

Task/Synchronous-concurrency/Swift/synchronous-concurrency-3.swift

@@ -0,0 +1,17 @@
+//
+//  main.swift
+//
+
+import Foundation
+
+dispatch_async(dispatch_get_global_queue(0, 0)) {
+    let printer = Printer()
+    printer.waitForLines()
+}
+
+dispatch_async(dispatch_get_global_queue(0, 0)) {
+    let reader = Reader()
+    reader.readFile()
+}
+
+CFRunLoopRun()