{"id":199614,"date":"2020-11-03T17:40:12","date_gmt":"2020-11-03T09:40:12","guid":{"rendered":"http:\/\/4563.org\/?p=199614"},"modified":"2020-11-24T12:15:42","modified_gmt":"2020-11-24T04:15:42","slug":"golang-channe-%e4%bd%a0%e7%9f%a5%e5%a4%9a%e5%b0%91","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=199614","title":{"rendered":"Golang channe \u4f60\u77e5\u591a\u5c11"},"content":{"rendered":"
\n
\n
\n

Golang channe \u4f60\u77e5\u591a\u5c11 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : haicoderibai <\/span> <\/i> 5<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n
\n

\u539f\u6587\u5730\u5740\uff1a\u55e8\u5ba2\u7f51<\/strong><\/p>\n<\/blockquote>\n

Golang channel \u4f7f\u7528<\/h1>\n

<\/p>\n

Golang channel \u4f7f\u7528\u6559\u7a0b<\/h2>\n

\u5728 golang<\/strong> \u4e2d channel<\/strong> \u7528\u4e8e goroutine<\/strong> \u4e4b\u95f4\u7684\u901a\u4fe1\uff0cchannel \u662f\u5f15\u7528\u7c7b\u578b\uff0c\u9700\u8981\u4f7f\u7528 make \u6765\u521b\u5efa channel \u3002\u5728 Golang \u4e2d\uff0c\u7528\u901a\u4fe1\u6765\u5171\u4eab\u5185\u5b58\uff0c\u800c\u4e0d\u8981\u7528\u5171\u4eab\u5185\u5b58\u6765\u901a\u4fe1\u3002<\/p>\n

channel \u521b\u5efa\u8be6\u89e3<\/h2>\n

\u8bed\u6cd5<\/h3>\n
ch := make(chan Type, [buffer]) <\/code><\/pre>\n
\u53c2\u6570<\/h3>\n
ch<\/strong>\uff1a \u521b\u5efa\u7684 channel \u7c7b\u578b\u7684\u53d8\u91cf Type<\/strong>\uff1a channel \u7684\u7c7b\u578b buffer<\/strong>\uff1a channel \u7f13\u51b2\u533a\u5927\u5c0f<\/p>\n
\u8bf4\u660e<\/h3>\n
make \u5bf9\u4e8e channel \u63a5\u6536\u4e24\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u662f\u901a\u9053\u7684\u7c7b\u578b\uff0c\u7b2c\u4e8c\u4e2a\u662f\u4e2a\u53ef\u9009\u53c2\u6570\u4ee3\u8868\u901a\u9053\u7f13\u51b2\u533a\u7684\u5927\u5c0f(\u7701\u7565\u4ee3\u8868\u65e0\u7f13\u51b2)\u3002<\/p>\n
\u65e0\u7f13\u51b2 channel<\/h3>\n
ch := make(chan int) <\/code><\/pre>\n
\u5e26\u7f13\u51b2 channel<\/h3>\n
ch := make(chan int, 2) <\/code><\/pre>\n
channel \u5199\u5165\u6570\u636e<\/h2>\n
\u8bf4\u660e<\/h3>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 <-<\/code> \u7b26\u53f7\u6307\u5411 channel \u6765\u5c06\u5143\u7d20\u653e\u5165 channel \u4e2d\uff0c\u6ce8\u610f\u5411\u901a\u9053\u4e2d\u4f20\u503c\u5fc5\u987b\u8981\u6c42\u8be5\u901a\u9053\u8fd8\u6709\u5bb9\u91cf(\u7f13\u51b2)\uff0c\u800c\u4e14\u901a\u9053\u4e0d\u80fd\u5173\u95ed\u3002<\/p>\n
\u5bf9\u4e8e\u65e0\u7f13\u51b2\u7684\u6216\u8005\u7f13\u51b2\u5df2\u7ecf\u6ee1\u4e86\u7684 channel \u4e0d\u53ef\u4ee5\u8f7b\u6613\u7684\u4f20\u5165\u503c\uff0c\u5fc5\u987b\u8981\u6709 goroutine \u540c\u65f6\u5728\u53d6\u5143\u7d20\u624d\u53ef\u4ee5\u653e\u5165\u3002<\/p>\n
\u793a\u4f8b<\/h3>\n
\u5411\u4e00\u4e2a\u6709\u7f13\u51b2\uff0c\u975e\u6ee1\u7684 channel \u4f20\u503c<\/p>\n
c := make(chan int, 1) \/\/ \u5b9a\u4e49\u4e00\u4e2a\u5e26\u6709\u4e00\u4e2a\u7f13\u51b2\u7684\u901a\u9053 c <- 1   \/\/ \u5411\u901a\u9053\u4e2d\u4f20\u5165\u4e00\u4e2a 1,\u6b63\u5e38 <\/code><\/pre>\n
\u5411\u4e00\u4e2a\u6709\u7f13\u51b2\uff0c\u6ee1\u7684 channel \u4f20\u503c<\/p>\n
c := make(chan int, 1) \/\/ \u5b9a\u4e49\u4e00\u4e2a\u5e26\u6709\u4e00\u4e2a\u7f13\u51b2\u7684\u901a\u9053 c <- 1                 \/\/ \u5411\u901a\u9053\u4e2d\u4f20\u5165\u4e00\u4e2a\u503c\uff0c\u8fd9\u4e2a\u503c\u4f20\u5165\u540e\u586b\u6ee1\u4e86\u8be5\u901a\u9053 c <- 2                 \/\/ \u518d\u5411\u901a\u9053\u4e2d\u4f20\u5165\u4e00\u4e2a\u503c\uff0c\u62a5\u9519 <\/code><\/pre>\n
\u5411\u4e00\u4e2a\u65e0\u7f13\u51b2\u7684 channel \u4f20\u503c<\/p>\n
c := make(chan int) \/\/ \u5b9a\u4e49\u4e00\u4e2a\u65e0\u7f13\u51b2\u901a\u9053 c <- 1              \/\/ \u5411\u65e0\u7f13\u51b2\u901a\u9053\u4f20\u503c\uff0c\u62a5\u9519 <\/code><\/pre>\n
\u5176\u5b9e\u4e0a\u8ff0\u4e24\u79cd\u9519\u8bef\u5747\u662f\u7531\u4e8e\u901a\u9053\u6ee1\u4e86\u800c\u5f15\u8d77\u7684(\u65e0\u7f13\u51b2\u7684\u901a\u9053\u53ef\u4ee5\u770b\u6210\u662f\u7f13\u51b2\u4e3a 0 \u7684\u901a\u9053)\uff0c\u89e3\u51b3\u65b9\u6cd5\u5f88\u7b80\u5355\uff0c\u53ea\u8981\u4fdd\u8bc1\u6709\u4e2a goroutine \u540c\u65f6\u5728\u4ece\u8be5\u901a\u9053\u4e2d\u53d6\u503c\u5373\u53ef\u3002<\/p>\n
channel \u8bfb\u53d6\u6570\u636e<\/h2>\n
\u8bf4\u660e<\/h3>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 <-<\/code> \u7b26\u53f7\u6307\u5411\u53d8\u91cf\u6765\u5c06 channel \u4e2d\u7684\u5143\u7d20\u653e\u53d8\u91cf\u4e2d\uff0c\u6b64\u65f6\u53ef\u4ee5\u63a5\u6536\u4e24\u4e2a\u503c\u4e00\u4e2a\u6570\u503c\u4e00\u4e2a\u72b6\u6001\uff0c\u5982\u4e0b\u4ee3\u7801\uff1a<\/p>\n
v, ok := <-c   \/\/ c \u662f\u901a\u9053,v \u662f\u53d6\u5230\u7684\u503c,ok \u662f\u72b6\u6001,\u6b63\u5e38\u65f6\u662f true,\u4ece\u5173\u95ed\u7684\u7a7a\u901a\u9053\u53d6\u503c\u662f false <\/code><\/pre>\n
\u5bf9\u4e8e\u65e0\u7f13\u51b2\u7684\u6216\u8005\u7f13\u51b2\u5df2\u7ecf\u7a7a\u4e86\u7684 channel \u4e0d\u53ef\u4ee5\u8f7b\u6613\u7684\u53d6\u51fa\u503c,\u5fc5\u987b\u8981\u540c\u65f6\u5728\u653e\u5143\u7d20\u624d\u53ef\u4ee5\u53d6\u51fa\u3002<\/p>\n
\u793a\u4f8b<\/h3>\n
ok \u4e3a true \u7684\u4f8b\u5b50<\/p>\n
c := make(chan int, 1) c <- 1 a, ok := <-c fmt.Println(a, ok)  \/\/ \u8f93\u51fa 1 true <\/code><\/pre>\n
ok \u4e3a false \u7684\u4f8b\u5b50<\/p>\n
c := make(chan int, 1) close(c) a, ok := <-c fmt.Println(a, ok)  \/\/ \u8f93\u51fa 0 false <\/code><\/pre>\n
ok \u7684\u5e94\u7528–\u5faa\u73af\u53d6\u503c<\/p>\n
for {     v, ok := <- c     if !ok {         break     }     fmt.Println(v) } <\/code><\/pre>\n
range \u53d6\u503c<\/p>\n
func main() {     c := make(chan int, 10)      for i:=0; i< 10; i++ {         c <- i     }     close(c)      for v := range c{         fmt.Println(v)     } } <\/code><\/pre>\n
\u5411\u4e00\u4e2a\u6709\u7f13\u51b2,\u975e\u7a7a\u7684 channel \u53d6\u503c<\/p>\n
c := make(chan int, 1) \/\/ \u5b9a\u4e49\u4e00\u4e2a\u5e26\u6709\u4e00\u4e2a\u7f13\u51b2\u7684\u901a\u9053 c <- 1                 \/\/ \u5411\u901a\u9053\u4e2d\u4f20\u5165\u4e00\u4e2a 1,\u4f7f\u901a\u9053\u975e\u7a7a i := <-c               \/\/ \u4ece\u901a\u9053\u4e2d\u53d6\u51fa\u4e00\u4e2a\u503c\u8d4b\u7ed9\u53d8\u91cf i \/\/ \u5982\u679c\u53ea\u662f\u60f3\u53d6\u51fa\u503c\u800c\u4e0d\u60f3\u5bf9\u8be5\u503c\u505a\u4efb\u4f55\u5176\u4ed6\u64cd\u4f5c,\u53ef\u4ee5\u8fd9\u4e48\u5199   <-c   \u5de6\u8fb9\u7701\u7565\u63a5\u6536\u8005 <\/code><\/pre>\n
\u5411\u4e00\u4e2a\u6709\u7f13\u51b2,\u7a7a\u7684 channel \u53d6\u503c<\/p>\n
c := make(chan int, 1) \/\/ \u5b9a\u4e49\u4e00\u4e2a\u5e26\u6709\u4e00\u4e2a\u7f13\u51b2\u7684\u901a\u9053 <-c                    \/\/ \u5411\u7a7a\u901a\u9053\u4e2d\u53d6\u51fa\u4e00\u4e2a\u503c,\u62a5\u9519 <\/code><\/pre>\n
\u5411\u4e00\u4e2a\u65e0\u7f13\u51b2\u7684 channel \u53d6\u503c<\/p>\n
c := make(chan int) \/\/ \u5b9a\u4e49\u4e00\u4e2a\u65e0\u7f13\u51b2\u901a\u9053 <-c                 \/\/ \u5411\u65e0\u7f13\u51b2\u901a\u9053\u53d6\u503c,\u62a5\u9519 <\/code><\/pre>\n
\u5176\u5b9e\u4e0a\u8ff0\u4e24\u79cd\u9519\u8bef\u5747\u662f\u7531\u4e8e\u901a\u9053\u7a7a\u4e86\u800c\u5f15\u8d77\u7684(\u65e0\u7f13\u51b2\u7684\u901a\u9053\u53ef\u4ee5\u770b\u6210\u662f\u7f13\u51b2\u4e3a 0 \u7684\u901a\u9053),\u89e3\u51b3\u65b9\u6cd5\u5f88\u7b80\u5355,\u53ea\u8981\u4fdd\u8bc1\u540c\u65f6\u5728\u4ece\u8be5\u901a\u9053\u4e2d\u5b58\u503c\u5373\u53ef\u3002<\/p>\n
\u5173\u95ed channel \u8be6\u89e3<\/h2>\n
\u8bf4\u660e<\/h3>\n
\u5bf9\u4e8e\u4e00\u4e2a\u901a\u9053\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 close \u5185\u7f6e\u51fd\u6570\u6765\u8fdb\u884c\u5173\u95ed\uff0c\u5173\u95ed\u540e\u7684\u901a\u9053\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/p>\n
    \n
  • \u5411\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u7684\u901a\u9053\u53d1\u9001\u503c\u662f\u4e0d\u5141\u8bb8\u7684\uff0c\u4f1a\u62a5\u9519<\/li>\n
  • \u4ece\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u4f46\u662f\u91cc\u9762\u8fd8\u6709\u503c\u7684\u901a\u9053\u53d6\u503c\u662f\u5141\u8bb8\u7684\uff0c\u53ef\u4ee5\u6b63\u5e38\u83b7\u53d6\u5230\u503c<\/li>\n
  • \u4ece\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u4f46\u662f\u4e3a\u7a7a\u7684\u901a\u9053\u53d6\u503c\u662f\u5141\u8bb8\u7684\uff0c\u4f1a\u83b7\u53d6\u901a\u9053\u7c7b\u578b\u5143\u7d20\u7684\u96f6\u503c<\/li>\n
  • \u4e0d\u53ef\u4ee5\u518d\u6b21\u5173\u95ed\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u7684\u901a\u9053,\u4f1a\u62a5\u9519<\/li>\n
  • \u5df2\u7ecf\u5173\u95ed\u7684\u901a\u9053\u65e0\u6cd5\u518d\u6b21\u6253\u5f00<\/li>\n<\/ul>\n
    \u793a\u4f8b<\/h3>\n
    \u5411\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u7684\u901a\u9053\u53d1\u9001\u503c<\/p>\n
    c := make(chan int, 1) close(c) c <- 1   \/\/ \u62a5\u9519 <\/code><\/pre>\n
    \u4ece\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u4f46\u662f\u91cc\u9762\u8fd8\u6709\u503c\u7684\u901a\u9053\u53d6\u503c<\/p>\n
    c := make(chan int, 1) c <- 1 close(c) a := <-c fmt.Println(a)  \/\/ \u8f93\u51fa 1 <\/code><\/pre>\n
    \u4ece\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u4f46\u662f\u4e3a\u7a7a\u7684\u901a\u9053\u53d6\u503c<\/p>\n
    c := make(chan int, 1) close(c) a := <-c fmt.Println(a)  \/\/ \u8f93\u51fa 0  <\/code><\/pre>\n
    \u5173\u95ed\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u7684\u901a\u9053<\/p>\n
    c := make(chan int, 1) close(c) close(c) \/\/ \u62a5\u9519: panic: close of closed channel <\/code><\/pre>\n
    \u5355\u5411\u901a\u9053<\/h2>\n
    \u8bf4\u660e<\/h3>\n
    \u5728\u51fd\u6570\u4e2d\u4f7f\u7528\u901a\u9053\u65f6\u6211\u4eec\u53ef\u4ee5\u9650\u5236\u5176\u4e3a\u53ea\u8bfb\u901a\u9053\u6216\u8005\u53ea\u5199\u901a\u9053\u3002<\/p>\n
    \u53ea\u8bfb\u901a\u9053<\/h3>\n
    func doWork(i <-chan int) {     <-i      \/\/ \u53ea\u80fd\u53d6\u503c     \/\/i <- 1 \/\/ \u5b58\u503c\u64cd\u4f5c\u5c06\u4e0d\u88ab\u5141\u8bb8 } <\/code><\/pre>\n
    \u53ea\u5199\u901a\u9053<\/h3>\n
    func doWork(i chan <- int) {     i <- 1      \/\/ \u53ea\u80fd\u5b58\u503c     \/\/<-i       \/\/ \u53d6\u503c\u64cd\u4f5c\u5c06\u4e0d\u88ab\u5141\u8bb8 } <\/code><\/pre>\n
    \u6848\u4f8b<\/h2>\n
    channel \u901a\u4fe1<\/h3>\n
    \u4f7f\u7528 channel \u5b9e\u73b0\u901a\u4fe1<\/p>\n
    package main  import (     \"fmt\"     \"sync\"     \"time\" )  var wg sync.WaitGroup  func main() {     fmt.Println(\"\u55e8\u5ba2\u7f51(www.haicoder.net)\")      c := make(chan int, 1)      c <- 1  \/\/ \u56e0\u4e3a\u6211\u4eec\u5b9a\u4e49\u7684\u901a\u9053\u5e26\u6709\u4e00\u4e2a\u7f13\u51b2,     \/\/ \u6240\u4ee5\u5728\u53d1\u5e03\u4efb\u52a1\u4e4b\u524d\u5141\u8bb8\u5b58\u5728\u6700\u591a\u4e00\u4e2a\u4efb\u52a1\u6295\u9012,\u4e5f\u53ef\u4ee5\u5199\u5728\u53d1\u5e03\u4efb\u52a1\u4e4b\u540e      \/\/ for \u5faa\u73af\u7528\u4e8e\u53d1\u5e03\u4efb\u52a1     for i := 0; i < 2; i++ {         wg.Add(1)         go doWork(c)    \/\/ \u5982\u679c\u901a\u9053\u73b0\u5728\u662f\u7a7a\u7684 goroutine \u4f1a\u7b49\u5f85,         \/\/ \u5982\u679c\u68c0\u6d4b\u5230\u73b0\u5728\u662f\u7a7a\u7684\u4e14\u6ca1\u6709\u4efb\u52a1\u6295\u9012,\u5c31\u4f1a\u62a5\u9519     }      c <- 2  \/\/ \u591a\u4f59\u7684\u4efb\u52a1\u6295\u9012\u5fc5\u987b\u5728\u4efb\u52a1\u53d1\u5e03\u4e4b\u540e      wg.Wait() }  func doWork(i chan int) {     defer wg.Done()     a := <-i     fmt.Printf(\"%d \u53f7\u5f00\u59cb\u5de5\u4f5c\u4e86n\", a)     time.Sleep(time.Second * 2) \/\/ \u6a21\u62df\u8017\u65f6     fmt.Printf(\"%d \u53f7\u7ed3\u675f\u5de5\u4f5c\u4e86,\u8f93\u51fa:%dn\", a, a) } <\/code><\/pre>\n
    \u6b64\u65f6\uff0c\u6211\u4eec\u8fd0\u884c\u7a0b\u5e8f\uff0c\u63a7\u5236\u53f0\u8f93\u51fa\u5982\u4e0b\uff1a<\/p>\n
    \"Golang<\/p>\n
    \u6211\u4eec\u4f7f\u7528\u4e86 channel \u5b9e\u73b0\u4e86\uff0c\u6536\u53d1\u6570\u636e\u3002<\/p>\n
    channel \u901a\u4fe1<\/h3>\n
    \u4f7f\u7528 channel \u5b9e\u73b0\u901a\u4fe1<\/p>\n
    package main  import (     \"fmt\"     \"sync\"     \"time\" )  var wg sync.WaitGroup  func main() {     fmt.Println(\"\u55e8\u5ba2\u7f51(www.haicoder.net)\")      c := make(chan int, 1)     wg.Add(1)     go doWork(c)     <-c         \/\/ \u53d6\u503c\u5fc5\u987b\u5728\u653e\u503c\u4e4b\u540e     wg.Wait() }  func doWork(i chan int) {     defer wg.Done()     fmt.Printf(\"goroutine \u5f00\u59cb\u5de5\u4f5c\u4e86n\", )     time.Sleep(time.Second * 2) \/\/ \u6a21\u62df\u8017\u65f6     i <- 1     fmt.Printf(\"goroutine \u7ed3\u675f\u5de5\u4f5c\u4e86,\u653e\u5165:%dn\", 1) } <\/code><\/pre>\n
    \u6b64\u65f6\uff0c\u6211\u4eec\u8fd0\u884c\u7a0b\u5e8f\uff0c\u63a7\u5236\u53f0\u8f93\u51fa\u5982\u4e0b\uff1a<\/p>\n
    \"Golang<\/p>\n
    \u6211\u4eec\u4f7f\u7528\u4e86 channel \u5b9e\u73b0\u4e86\uff0c\u6536\u53d1\u6570\u636e\u3002<\/p>\n
    Golang channel \u4f7f\u7528\u603b\u7ed3<\/h2>\n
    \u5728 golang \u4e2d channel \u7528\u4e8e goroutine \u4e4b\u95f4\u7684\u901a\u4fe1\uff0cchannel \u662f\u5f15\u7528\u7c7b\u578b\uff0c\u9700\u8981\u4f7f\u7528 make \u6765\u521b\u5efa channel \u3002\u5728 Golang \u4e2d\uff0c\u7528\u901a\u4fe1\u6765\u5171\u4eab\u5185\u5b58\uff0c\u800c\u4e0d\u8981\u7528\u5171\u4eab\u5185\u5b58\u6765\u901a\u4fe1\u3002<\/p>\n
    \u539f\u6587\u5730\u5740\uff1a\u55e8\u5ba2\u7f51<\/strong><\/p>\n
    \u66f4\u591a\u6587\u7ae0\uff0c\u53ef\u4ee5\u5173\u6ce8\u4e0b\u65b9\u516c\u4f17\u53f7\uff1a<\/p>\n
    \"Golang<\/p>\n<\/p><\/div>\n
     \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>)        <\/div>\n
     <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
      \n
    • \n","protected":false},"excerpt":{"rendered":"
      Golang channe \u4f60\u77e5\u591a…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/199614"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=199614"}],"version-history":[{"count":1,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/199614\/revisions"}],"predecessor-version":[{"id":199617,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/199614\/revisions\/199617"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=199614"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=199614"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=199614"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}