added sem simple worker pool

concurrency/simplesem/main.go

@@ -0,0 +1,25 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	concurrentCount := 5
+	sem := make(chan bool, concurrentCount)
+
+	for i := 0; i < 100; i++ {
+		sem <- true
+		go func(i int) {
+			dummyProcess(i)
+			<-sem
+		}(i)
+	}
+	time.Sleep(time.Second * 20)
+}
+
+func dummyProcess(i int) {
+	fmt.Printf("Process Dummy %v \n", i)
+	time.Sleep(time.Second)
+}

urfavecli/main.go

@@ -0,0 +1,27 @@
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/urfave/cli"
+)
+
+func main() {
+	app := cli.NewApp()
+	app.Name = "hello_cli"
+	app.Usage = "Print hello world"
+	app.Flags = []cli.Flag{
+		cli.StringFlag{
+			Name:  "name, n",
+			Value: "World",
+			Usage: "Who to say hello to.",
+		},
+	}
+	app.Action = func(c *cli.Context) error {
+		name := c.GlobalString("name")
+		fmt.Printf("Hello %s!\n", name)
+		return nil
+	}
+	app.Run(os.Args)
+}