Concurrency tests

.gitignore

@@ -38,3 +38,4 @@ my-fnv/my-fnv
 my-md5/my-md5
 shadir/shadir
 shadirconcurrent/shadirconcurrent
+pinger/pinger 

pinger/main.go

@@ -0,0 +1,29 @@
+package main
+
+import "fmt"
+import "time"
+
+func pinger(c chan string) {
+	c <- "ping"
+}
+func ponger(c1 chan string, c2 chan string) {
+	<-c1
+	c2 <- "pong"
+}
+func printer(c chan string) {
+	msg := <-c
+	fmt.Println(msg)
+	time.Sleep(time.Second)
+}
+
+func main() {
+	pingChan, pongChan := make(chan string), make(chan string)
+
+	go pinger(pingChan)
+	go ponger(pingChan, pongChan)
+	go printer(pongChan)
+
+	var input string
+	fmt.Scanln(&input)
+
+}

sandbox/main.go

@@ -0,0 +1,17 @@
+package main
+
+import "fmt"
+import "sync"
+
+var wg sync.WaitGroup
+
+func main() {
+	for i := 0; i < 5; i++ {
+		go func() {
+			defer wg.Done()
+			wg.Add(1)
+			fmt.Println("Hello World")
+		}()
+	}
+	wg.Wait()
+}