Fix warnings

Author: devlights

examples/advanced/errgrp/cmpwaitgroup/error_with_errgroup.go

@@ -2,6 +2,8 @@ package cmpwaitgroup
 
 import (
 	"fmt"
+	"math/rand"
+	"time"
 
 	"github.com/devlights/gomy/enumerable"
 	"github.com/devlights/gomy/output"
@@ -15,6 +17,7 @@ func ErrWithErrGroup() error {
 	var (
 		loopRange = enumerable.NewRange(1, 6)
 		waitGrp   = errgroup.Group{}
+		rnd       = rand.New(rand.NewSource(time.Now().UnixNano()))
 	)
 
 	// ----------------------------------------------------------------------------------------
@@ -36,7 +39,7 @@ func ErrWithErrGroup() error {
 			output.Stderrl(prefix, "start")
 			defer output.Stderrl(prefix, "end")
 
-			err := randomErr(prefix)
+			err := randomErr(prefix, rnd)
 			if err != nil {
 				output.Stderrl(prefix, "\tERROR!!")
 			}

examples/advanced/errgrp/cmpwaitgroup/error_with_waitgroup.go

@@ -10,16 +10,13 @@ import (
 	"github.com/devlights/gomy/output"
 )
 
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
 // ErrWithWaitGroup は、標準ライブラリ sync.WaitGroup でエラー情報を呼び元に伝播させるサンプルです.
 func ErrWithWaitGroup() error {
 	var (
 		loopRange = enumerable.NewRange(1, 6)
 		waitGrp   = sync.WaitGroup{}
 		errorCh   = make(chan error)
+		rnd       = rand.New(rand.NewSource(time.Now().UnixNano()))
 	)
 
 	// ----------------------------------------------------------------------------------------
@@ -37,7 +34,7 @@ func ErrWithWaitGroup() error {
 			output.Stderrl(prefix, "start")
 			defer output.Stderrl(prefix, "end")
 
-			err := randomErr(prefix)
+			err := randomErr(prefix, rnd)
 			if err != nil {
 				output.Stderrl(prefix, "\tERROR!!")
 				errorCh <- err
@@ -58,8 +55,8 @@ func ErrWithWaitGroup() error {
 	return nil
 }
 
-func randomErr(message string) error {
-	i := rand.Intn(100)
+func randomErr(message string, rnd *rand.Rand) error {
+	i := rnd.Intn(100)
 	if i > 30 {
 		return fmt.Errorf("randomErr [%d][%s]", i, message)
 	}

examples/basic/bitop/bitflags.go

@@ -22,6 +22,13 @@ const (
 	None    = 0
 )
 
+// ---------------------------------------
+// Vars
+// ---------------------------------------
+var (
+	rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
+)
+
 // ---------------------------------------
 // Types
 // ---------------------------------------
@@ -40,7 +47,7 @@ func (me producer) put(n int) context.Context {
 		defer cxl()
 		for i := 0; i < n; i++ {
 			me <- i
-			time.Sleep(time.Duration(rand.Intn(10)) * time.Millisecond)
+			time.Sleep(time.Duration(rnd.Intn(10)) * time.Millisecond)
 		}
 	}()
 	return ctx
@@ -52,7 +59,7 @@ func (me consumer) take(prefix string) context.Context {
 		defer cxl()
 		for v := range me {
 			log.Printf("%s: %v\n", prefix, v)
-			time.Sleep(time.Duration(rand.Intn(50)) * time.Millisecond)
+			time.Sleep(time.Duration(rnd.Intn(50)) * time.Millisecond)
 		}
 	}()
 	return ctx
@@ -127,7 +134,6 @@ func (me reporter) start() context.Context {
 // BitFlags -- ビットフラグのサンプルです.
 func BitFlags() error {
 	log.SetFlags(0)
-	rand.Seed(time.Now().Unix())
 
 	// initialize jobs
 	var (

examples/basic/loops/for_loop_copy_value.go

@@ -19,7 +19,7 @@ func ForLoopCopyValue() error {
 			for _, v := range accs {
 				fmt.Printf("%v", v)
 			}
-			fmt.Println("")			
+			fmt.Println("")
 		}
 	)
 

examples/basic/unsafes/unsafe_sizeof.go

@@ -44,6 +44,8 @@ func Sizeof() error {
 		},
 	}
 
+	fmt.Println("mem", m)
+
 	fmt.Println("bool", unsafe.Sizeof(m.b))
 	fmt.Println("int", unsafe.Sizeof(m.i))
 	fmt.Println("int16", unsafe.Sizeof(m.i16))
@@ -57,5 +59,6 @@ func Sizeof() error {
 
 	fmt.Println("----")
 	fmt.Println("mem", unsafe.Sizeof(m))
+
 	return nil
 }

examples/gotour/gotour10/tutorial_gotour_10_if.go

@@ -23,10 +23,9 @@ func If() error {
 	// if err := xxxx(); err != nil {
 	// }
 	// ------------------------------------------------------------
-	rand.Seed(time.Now().UnixNano())
-
 	var (
-		i = rand.Intn(100)
+		rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
+		i   = rnd.Intn(100)
 	)
 
 	// 通常の if
@@ -41,7 +40,7 @@ func If() error {
 	// ステートメント付きの if
 	// ifの条件部で宣言した変数は if ブロックの中で使えるし
 	// elseブロックの中でも見える
-	if i2 := rand.Intn(100); i2 < 80 {
+	if i2 := rnd.Intn(100); i2 < 80 {
 		fmt.Println("< 80")
 	} else {
 		fmt.Println("> 80")

examples/gotour/gotour11/tutorial_gotour_11_switch.go

@@ -21,10 +21,10 @@ func Switch() error {
 	// - 条件部を 指定しない switch　は、 switch true {} と書いてるのと同じ
 	//   - if-then-else を長くかくより、 switch {} を使うほうがシンプルに表現できる.
 	// ------------------------------------------------------------
-	rand.Seed(time.Now().UnixNano())
 	var (
-		i = rand.Intn(6)
-		f = func() int {
+		rnd = rand.New(rand.NewSource(time.Now().UnixNano()))
+		i   = rnd.Intn(6)
+		f   = func() int {
 			return 3
 		}
 	)

examples/socket/tcp_02_twoway_recvside_close/client/main.go

@@ -39,10 +39,6 @@ var (
 	appLog = log.New(os.Stderr, "[client] ", log.Ltime|log.Lmicroseconds)
 )
 
-func init() {
-	rand.Seed(time.Now().UnixNano())
-}
-
 func exitOnErr(err error) {
 	if err != nil {
 		if err != io.EOF {
@@ -73,7 +69,8 @@ func main() {
 	// 		(1) length: uint32 (4-bytes)
 	// 		(2) data  : string (variable)
 	var (
-		message = items[rand.Intn(len(items))]
+		rnd     = rand.New(rand.NewSource(time.Now().UnixNano()))
+		message = items[rnd.Intn(len(items))]
 		length  = make([]byte, 4)
 		buf     = new(bytes.Buffer)
 	)