From 3fb6cf9c019030ffb16654c9a280db26d98bfcb0 Mon Sep 17 00:00:00 2001
From: acevest <zhaoyanbai@126.com>
Date: Fri, 2 Jun 2017 17:17:24 +0800
Subject: [PATCH] ...

---
 learn/go/clock.go  | 52 +++++++++++++++++++++++++++++++++++
 learn/go/panic.go  | 34 +++++++++++++++++++++++
 learn/go/select.go | 67 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 153 insertions(+)
 create mode 100644 learn/go/clock.go
 create mode 100644 learn/go/panic.go
 create mode 100644 learn/go/select.go

diff --git a/learn/go/clock.go b/learn/go/clock.go
new file mode 100644
index 0000000..c7ce67a
--- /dev/null
+++ b/learn/go/clock.go
@@ -0,0 +1,52 @@
+/*
+ * ------------------------------------------------------------------------
+ *   File Name: clock.go
+ *      Author: Zhao Yanbai
+ *              2017-05-29 12:35:49 星期一 CST
+ * Description: none
+ * ------------------------------------------------------------------------
+ */
+
+package main
+
+import (
+    "io"
+    "fmt"
+    "net"
+    "log"
+    "time"
+)
+
+func main() {
+    defer fmt.Println("Clock Server Exited..")
+
+    listener, err := net.Listen("tcp", ":8000")
+    if err != nil {
+        log.Fatal(err)
+    }
+
+    for {
+        conn, err := listener.Accept()
+        if err != nil {
+            log.Print(err)
+            continue
+        }
+
+        go handleConn(conn)
+    }
+}
+
+
+func handleConn(c net.Conn) {
+    defer c.Close()
+
+    for {
+        _, err := io.WriteString(c, time.Now().Format("2006-01-02 15:04:05\n"))
+        if err != nil {
+            return
+        }
+
+        //time.Sleep(1 * time.Second)
+        time.Sleep(100 * time.Millisecond);
+    }
+}
diff --git a/learn/go/panic.go b/learn/go/panic.go
new file mode 100644
index 0000000..a065032
--- /dev/null
+++ b/learn/go/panic.go
@@ -0,0 +1,34 @@
+/*
+ * ------------------------------------------------------------------------
+ *   File Name: panic.go
+ *      Author: Zhao Yanbai
+ *              2017-05-20 12:17:13 星期六 CST
+ * Description: none
+ * ------------------------------------------------------------------------
+ */
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+)
+
+func main() {
+	defer fmt.Println("Program Exited...")
+	defer printStack()
+	panicFunc(3)
+}
+
+func printStack() {
+    var buf [4096]byte
+    n := runtime.Stack(buf[:], false)
+    os.Stdout.Write(buf[:n])
+}
+
+func panicFunc(n int) {
+	fmt.Printf("panicFunc(%d)\n", n+0/n)
+	defer fmt.Printf("defer panicFunc(%d)\n", n)
+	panicFunc(n - 1)
+}
diff --git a/learn/go/select.go b/learn/go/select.go
new file mode 100644
index 0000000..c5cdee6
--- /dev/null
+++ b/learn/go/select.go
@@ -0,0 +1,67 @@
+/*
+ * ------------------------------------------------------------------------
+ *   File Name: select.go
+ *      Author: Zhao Yanbai
+ *              2017-04-06 10:04:54 星期四 CST
+ * Description: none
+ * ------------------------------------------------------------------------
+ */
+package main
+import (
+    "fmt"
+    "sync"
+    "time"
+	"math/rand"
+)
+
+func main() {
+
+    data := make(chan int, 1)
+
+    var wg sync.WaitGroup
+    wg.Add(2)
+
+    go func() {
+        defer wg.Done()
+        totalSize := 0
+        for {
+            select {
+            case n := <-data:
+                fmt.Println("Received Data ", n)
+                totalSize += n
+            default:
+                fmt.Println("No Data Received")
+            }
+            fmt.Println("Received Total Size: ", totalSize)
+            time.Sleep(2*time.Second)
+            //time.Sleep(3*time.Millisecond)
+        }
+    }()
+
+
+    go func() {
+        defer wg.Done()
+        totalSend := 0
+        n := 0
+        for i :=0; i<100; i++ {
+            r := rand.Intn(100)
+            n += r
+            select {
+            case data<-n:
+                fmt.Println("Sent Data " , n)
+                totalSend += n
+                n = 0
+            default:
+                fmt.Println("No Data Sent")
+            }
+            time.Sleep(1*time.Second)
+            //time.Sleep(1*time.Millisecond)
+        }
+
+        fmt.Println("Sent Total Size: ", totalSend)
+    }()
+
+    wg.Wait()
+}
+
+
-- 
2.44.0