add sample goroutine

goroutine/gort1.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"time"
+)
+
+func server(i int) {
+	for {
+		print(i)
+		time.Sleep(1*1e9)
+	}
+}
+
+/*
+* this will no output if default: export GOMAXPROCS=1
+ */
+func f1() {
+	go server(1)
+	go server(2)
+	for {} 
+}
+
+func f3() {
+	go server(1)
+	go server(2)
+	for {
+		time.Sleep(1*1e6)
+	} 
+}
+
+func f2() {
+	go server(1)
+	go server(2)
+	time.Sleep(6*1000*1000) 
+}
+
+func main() {
+	f3()
+	//f2()
+}

goroutine/gort3.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"time"
+	"fmt"
+)
+
+func IsReady(what string, minutes int64) {
+	time.Sleep(minutes * 60 * 1e9) // Unit is nanosecs.
+	fmt.Println(what, "is ready")
+}
+
+func main() {
+	go IsReady("tea", 6)
+	go IsReady("coffee", 2)
+	fmt.Println("I'm waiting...")
+}