From bb1ac4fe4086674eaaeccb3b5fa3a30e05d05fac Mon Sep 17 00:00:00 2001
From: Meutel <meutel@meutel.net>
Date: Sat, 8 Jul 2017 14:54:39 +0200
Subject: [PATCH] Concurrency tests

---
 .gitignore      |  1 +
 pinger/main.go  | 29 +++++++++++++++++++++++++++++
 sandbox/main.go | 17 +++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 pinger/main.go
 create mode 100644 sandbox/main.go

diff --git a/.gitignore b/.gitignore
index d401de0..25977dc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -38,3 +38,4 @@ my-fnv/my-fnv
 my-md5/my-md5
 shadir/shadir
 shadirconcurrent/shadirconcurrent
+pinger/pinger 
diff --git a/pinger/main.go b/pinger/main.go
new file mode 100644
index 0000000..68c9417
--- /dev/null
+++ b/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)
+
+}
diff --git a/sandbox/main.go b/sandbox/main.go
new file mode 100644
index 0000000..f197c3e
--- /dev/null
+++ b/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()
+}