Initial data commit

Task/Synchronous-concurrency/D/synchronous-concurrency.d

@@ -0,0 +1,20 @@
+import std.algorithm, std.concurrency, std.stdio;
+
+void main() {
+    auto printer = spawn(&printTask, thisTid);
+    auto f = File("input.txt","r");
+    foreach (string line; lines(f))
+        send(printer, line);
+    send(printer, true);    //EOF
+    auto n = receiveOnly!(int)();
+    stdout.writefln("\n%d lines printed.", n);
+}
+
+void printTask(Tid reader) {
+    int n = 0;
+    for (bool eof = false; !eof;)
+        receive(
+            (string line) {stdout.write(line); n++;},
+            (bool) {send(reader, n); eof = true;}
+        );
+}