package channel
import (
"fmt"
"time"
"sync"
)
type People struct {
Name string
Id int
Age int
Sex string
State bool
}
/**main **/
func Start() {
go fmt.Println("good gogogog !")
fmt.Println("golang")
time.Sleep(1 * time.Second)
//goroutine
Publish(" ",time.Second * 3)
time.Sleep(1 * time.Second)
fmt.Println("Ten seconds later: I’m leaving now.")
TestChannel()
fmt.Println("all finish...")
}
func Publish(text string ,delay time.Duration) {
go func () {
time.Sleep(delay)
fmt.Println("breaking news: ", text)
}()
}
func TestChannel() {
// lc :=make(chan int)
//wc :=make(chan bool,10)
ch :=make(chan People)
//p := People{" ",101,100," ",true}
// pch :=make(chan *People)
go addPeople(ch)
for v := range ch {
fmt.Println("People is : ",v)
}
TestClose()
TestRange()
TestWait()
TestRace()
TestRace()
TestMutex()
TestWaitGroup()
TestSelect()
TestLast()
}
func addPeople (ch chan People ) {
p := People{" ",101,100," ",true}
ch <- p
close(ch)
}
func TestClose() {
ch := make(chan string)
go func(){
ch <- " "
close(ch)
}()
fmt.Println(<-ch)
fmt.Println(<-ch)
fmt.Println(<-ch)
fmt.Println(<-ch)
v,ok :=<-ch
fmt.Println("ok=",ok," v =",v)
}
/**
* range channel
**/
func TestRange() {
ch := make(chan int)
go RangeInfo(ch)
for v :=range ch {
fmt.Println("======= v= =====",v)
}
}
func RangeInfo(ch chan int) {
fmt.Println(" ...",time.Now().Format("2006-01-02 15:04:05"))
time.Sleep(1 * time.Second)
ch <- 100
fmt.Println(" ...",time.Now().Format("2006-01-02 15:04:05"))
time.Sleep(1 * time.Second)
ch <- 101
fmt.Println(" ...",time.Now().Format("2006-01-02 15:04:05"))
time.Sleep(1 * time.Second)
ch <- 102
fmt.Println(" ...",time.Now().Format("2006-01-02 15:04:05"))
time.Sleep(1 * time.Second)
ch <- 103
fmt.Println(" ...",time.Now().Format("2006-01-02 15:04:05"))
time.Sleep(3 * time.Second)
ch <- 104
fmt.Println(" ...",time.Now().Format("2006-01-02 15:04:05"))
time.Sleep(1 * time.Second)
ch <- 105
close(ch)
}
func TestWait() {
ch := TestWaitInfo()
fmt.Println(" .....")
<-ch
fmt.Println(" ....")
}
func TestWaitInfo() (wait <- chan struct{}) {
ch := make(chan struct{})
go func(){
fmt.Println(" ...")
time.Sleep(2* time.Second)
close(ch)
fmt.Println(" ...")
}()
return ch
}
func TestRace() {
wait := make(chan struct{})
n :=0
go func() {
n ++
close(wait)
}()
n ++
<- wait
fmt.Println(n)
}
func SharedIsCaring() {
ch := make(chan int)
go func(){
n :=0
n ++
ch <-n
}()
n := <- ch
n++
fmt.Println(n)
}
type AtomicInt struct {
mu sync.Mutex
n int
}
func(a *AtomicInt) Add(n int) {
a.mu.Lock()
a.n +=n
a.mu.Unlock()
}
func(a *AtomicInt) Value()( int) {
a.mu.Lock()
n := a.n
a.mu.Unlock()
return n
}
func TestMutex() {
wait :=make(chan struct{})
var n AtomicInt
go func(){
n.Add(1) //
close(wait)
}()
n.Add(2) //
<-wait
fmt.Println(n)
}
func TestWaitGroup() {
var wg sync.WaitGroup
wg.Add(5)
for i :=0;i<5;i++ {
n :=i
go func(){
fmt.Println(n)
wg.Done()
}()
}
wg.Wait()
}
func TestSelect() {
ch := make(chan int)
ch2 := make(chan bool)
go func(){
ch <- 100
close(ch)
ch2 <-true
close(ch2)
}()
select {
case v,ok:=<-ch:
fmt.Println("===========",ok,v)
case v,ok:=<-ch2:
fmt.Println("ch2 ",v,ok)
}
}
func TestLast() {
people := []string{" ", " ", " ", " ", " "}
match := make(chan string,1)
wg := new(sync.WaitGroup)
wg.Add(len(people))
for _,name:=range people{
go Seek(name,match,wg)
}
wg.Wait()
select {
case name:=<- match:
fmt.Println(" : ",name)
default:
}
}
func Seek(name string,match chan string,wg *sync.WaitGroup) {
select {
case peer:= <-match:
fmt.Printf("%s sent a message to %s.
", peer, name)
case match <-name:
}
wg.Done()
}
package main
import(
"fmt"
"channel"
)
func main(){
fmt.Println("===============")
channel.Start()
}
===============
golang
good gogogog !
Ten seconds later: I’m leaving now.
People is : { 101 100 true}
ok= false v =
... 2016-01-20 15:13:28
... 2016-01-20 15:13:29
======= v= ===== 100
breaking news:
... 2016-01-20 15:13:30
======= v= ===== 101
... 2016-01-20 15:13:31
======= v= ===== 102
... 2016-01-20 15:13:32
======= v= ===== 103
... 2016-01-20 15:13:35
======= v= ===== 104
======= v= ===== 105
.....
...
...
....
2
2
{{0 0} 3}
1
2
0
4
3
=========== true 100
sent a message to .
sent a message to .
:
all finish...