2013-03: adding an old learning lunch

2013/03-golang-learning-lunch/14-ngoroutines/main.go

@@ -0,0 +1,20 @@
+package main
+
+// START OMIT
+var ngoroutine = 100000
+
+func f(left, right chan int) { left <- 1 + <-right }
+
+func main() {
+	leftmost := make(chan int)
+	var left, right chan int = nil, leftmost
+	for i := 0; i < ngoroutine; i++ {
+		left, right = right, make(chan int)
+		go f(left, right)
+	}
+	right <- 0      // bang!
+	x := <-leftmost // wait for completion
+	println(x)      // 100000
+}
+
+// STOP OMIT