adds go-lang limiter

cmd/block-multiple/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+)
+
+type Limiter struct {
+	ch chan struct{}
+}
+
+func main() {
+	var l = &Limiter{
+		ch: make(chan struct{}, 1),
+	}
+
+	for i := 1; i <= 5; i++ {
+		go l.execute(func() {
+			var fName = "task"
+			fmt.Printf("Starting Execution of %s\n", fName)
+			time.Sleep(time.Second * 5)
+			fmt.Printf("Finished Execution of %s\n", fName)
+		})
+	}
+
+	forever()
+}
+
+func forever() {
+	s := make(chan os.Signal, 1)
+	signal.Notify(s, syscall.SIGTERM, syscall.SIGINT)
+
+	// wait for signal
+	sig := <-s
+	fmt.Printf("\nstarting shutdown procedure, detected signal: %s\n", sig)
+}
+
+func (l *Limiter) execute(f func()) error {
+	l.ch <- struct{}{}
+	defer func() {
+		<-l.ch
+	}()
+
+	f()
+
+	return nil
+}
+
+/*
+	var fName = "thingOne"
+	fmt.Printf("Starting Execution of %s\n", fName)
+	time.Sleep(time.Second * 5)
+	fmt.Printf("Finished Execution of %s\n", fName)
+*/