{"id":204935,"date":"2020-11-25T23:22:04","date_gmt":"2020-11-25T15:22:04","guid":{"rendered":"http:\/\/4563.org\/?p=204935"},"modified":"2020-11-26T18:37:33","modified_gmt":"2020-11-26T10:37:33","slug":"%e8%b0%88%e8%b0%88-golang-%e7%bc%93%e5%86%b2%e4%b8%8e%e6%97%a0%e7%bc%93%e5%86%b2-channel","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=204935","title":{"rendered":"\u8c08\u8c08 Golang \u7f13\u51b2\u4e0e\u65e0\u7f13\u51b2 channel"},"content":{"rendered":"
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\u8c08\u8c08 Golang \u7f13\u51b2\u4e0e\u65e0\u7f13\u51b2 channel <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : haicoderibai <\/span> <\/i> 0<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n
\n

\u539f\u6587\u6765\u81ea\uff1a\u55e8\u5ba2\u7f51<\/strong><\/p>\n<\/blockquote>\n

Golang \u7f13\u51b2\u4e0e\u65e0\u7f13\u51b2 channel<\/h1>\n

<\/p>\n

Golang \u7f13\u51b2\u4e0e\u65e0\u7f13\u51b2 channel \u6559\u7a0b<\/h2>\n

golang<\/strong> \u5728\u8bed\u8a00\u5c42\u9762\u652f\u6301\u5e76\u53d1\u7f16\u7a0b\uff0c\u4e5f\u5c31\u662f goroutine<\/strong>\uff0c\u53ef\u4ee5\u770b\u505a\u4e00\u79cd\u8f7b\u91cf\u7ea7\u7684\u7ebf\u7a0b\u3002\u7a0b\u5e8f\u542f\u52a8\u65f6\uff0c\u5176\u4e3b\u51fd\u6570\u5373\u5728\u4e00\u4e2a\u5355\u72ec\u7684 goruntine \u4e2d\u8fd0\u884c\uff0c\u53eb\u505a main goruntine\uff0c\u5728\u7a0b\u5e8f\u4e2d\u901a\u8fc7\u5173\u952e\u5b57 go \u8ddf\u4e0a\u51fd\u6570\uff08\u652f\u6301\u533f\u540d\u51fd\u6570\uff09\u5c31\u53ef\u4ee5\u542f\u52a8\u4e00\u4e2a\u65b0\u7684 goroutine\uff0c\u53ef\u4ee5\u53eb\u505a sub goruntine \u3002<\/p>\n

\u5728\u57fa\u4e8e\u591a\u7ebf\u7a0b\u8bbe\u8ba1\u7684\u5e76\u53d1\u7f16\u7a0b\u6a21\u578b\u4e2d\uff0c\u7ebf\u7a0b\u95f4\u7684\u901a\u4fe1\u5f80\u5f80\u901a\u8fc7\u5171\u4eab\u6570\u636e\u6765\u5b9e\u73b0\uff0c\u800c\u4fdd\u8bc1\u5171\u4eab\u6570\u636e\u7684\u4e00\u81f4\u6027\u975e\u5e38\u5173\u952e\u3002\u5982\u679c\u7ebf\u7a0b\u95f4\u6709\u7ade\u4e89\u6761\u4ef6\uff0c\u90a3\u4e48\u5bf9\u5171\u4eab\u6570\u636e\u7684\u8bbf\u95ee\u5f80\u5f80\u9700\u8981\u52a0\u9501\u6765\u4fdd\u8bc1\u4e00\u81f4\u6027\uff0c\u800c\u9488\u5bf9\u4e0d\u540c\u7684\u8bbf\u95ee\u7ade\u4e89\uff0c\u6bd4\u5982\u8bfb \/\u8bfb\u3001\u8bfb \/\u5199\u3001\u5199 \/\u5199\uff0c\u9700\u8981\u7528\u4e0d\u540c\u7684\u9501\u673a\u5236\uff0c\u8981\u60f3\u517c\u987e\u6027\u80fd\u548c\u4e00\u81f4\u6027\u4fdd\u8bc1\u9700\u8981\u715e\u8d39\u82e6\u5fc3\uff0c\u5c24\u5176\u662f\u7ebf\u7a0b\u95f4\u5171\u4eab\u6570\u636e\u6bd4\u8f83\u591a\u7684\u65f6\u5019\u3002<\/p>\n

\u4e3a\u4e86\u66f4\u7b80\u5355\u7684\u5e76\u53d1\u7f16\u7a0b\uff0cgo \u8bed\u8a00\u63d0\u51fa\u4e86\u81ea\u5df1\u7684\u4fe1\u4ef0\uff1a\u7528\u901a\u4fe1\u6765\u5171\u4eab\u5185\u5b58\uff0c\u800c\u4e0d\u8981\u7528\u5171\u4eab\u5185\u5b58\u6765\u901a\u4fe1\u3002\u5bf9\u4e8e goroutine \u4e4b\u95f4\u7684\u901a\u4fe1\uff0cchannel<\/strong> \u662f\u6700\u597d\u7684\u9009\u62e9\uff0c\u94ed\u8bb0\u8fd9\u53e5\u539f\u5219\uff1a\u7528\u901a\u4fe1\u6765\u5171\u4eab\u5185\u5b58\uff0c\u800c\u4e0d\u8981\u7528\u5171\u4eab\u5185\u5b58\u6765\u901a\u4fe1\uff0c\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u66f4\u597d\u7684\u7406\u89e3 channel \u3002<\/p>\n

channel \u72b6\u6001<\/h2>\n

channel \u4f5c\u4e3a go \u7684\u4e00\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u6709 3 \u79cd\u57fa\u672c\u72b6\u6001\uff1anil \u3001open \u3001closed\uff1a<\/p>\n

\/* nil channel *\/ var ch = chan string \/\/ A channel is in a nil state when it is declared to its zero value ch = nil \/\/ A channel can be placed in a nil state   \/* open channel *\/ ch := make(chan string) \/\/ A channel is in a open state when it\u2019s made using the built-in function make.   \/* closed channel *\/ close(ch) \/\/ A channel is in a closed state when it\u2019s closed using the built-in function close. <\/code><\/pre>\n
\u5f53 channel \u5904\u4e8e\u8fd9 3 \u79cd\u4e0d\u540c\u7684\u72b6\u6001\u65f6\uff0c\u5bf9\u4e8e channel \u4e0a\u7684\u64cd\u4f5c\u4e5f\u4f1a\u6709\u4e0d\u540c\u7684\u884c\u4e3a\uff0c\u7406\u89e3\u8fd9\u4e9b\u884c\u4e3a\u5bf9\u4e8e\u6b63\u786e\u7684\u4f7f\u7528 channel \u975e\u5e38\u91cd\u8981\u3002<\/p>\n
\"\u8c08\u8c08<\/p>\n
\u4e0a\u9762\u8fd9\u5f20\u56fe\u603b\u7ed3\u4e86\u8fd9\u4e9b\u884c\u4e3a\uff0c\u9700\u8981\u6ce8\u610f\u7684\u662f\u5904\u4e8e closed \u72b6\u6001\u7684 channel\uff0c\u6267\u884c send \u64cd\u4f5c\uff08 ch <- data \uff09\u5c06\u4f1a\u89e6\u53d1 panic \u5f02\u5e38\uff0c\u800c receive \u64cd\u4f5c\uff08<- ch \uff09\u5219\u4e0d\u4f1a\uff0c\u8fd9\u8868\u660e\u4e86\u5728 channel \u88ab close \u4e4b\u540e\uff0cgoruntine \u4ecd\u7136\u53ef\u4ee5\u4ece channel \u53d6\u8d70\u6570\u636e\uff0c\u5982\u679c channel \u4e2d\u6ca1\u6709\u6570\u636e\u53ef\u53d6\u65f6\uff0creceive \u64cd\u4f5c\u4f1a\u7acb\u523b\u8fd4\u56de\u96f6\u503c\uff08 nil \uff09\u3002<\/p>\n
range \u5faa\u73af\u53ef\u4ee5\u76f4\u63a5\u5728 channel \u4e0a\u8fed\u4ee3\uff0c\u5f53 channel \u88ab\u5173\u95ed\u5e76\u4e14\u6ca1\u6709\u6570\u636e\u65f6\u53ef\u4ee5\u76f4\u63a5\u8df3\u51fa\u5faa\u73af\u3002\u53e6\u5916\uff0c\u5bf9\u4e8e nil \u548c closed \u72b6\u6001\u7684 channel \u6267\u884c close \u64cd\u4f5c\u4e5f\u4f1a\u89e6\u53d1 panic \u5f02\u5e38\u3002<\/p>\n
unbufferd channel \u548c bufferd channel<\/h2>\n
\u4f7f\u7528\u573a\u666f<\/h3>\n
\u867d\u7136 channel \u6700\u5e38\u7528\u4e8e goroutine \u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u4f46\u662f channel \u4e0a\u7684 send \u548c receive \u64cd\u4f5c\u5e76\u4e0d\u4e00\u5b9a\u9700\u8981\u643a\u5e26\u6570\u636e\u3002\u6839\u636e channel \u662f\u5426\u9700\u8981\u4f20\u9012\u6570\u636e\uff0c\u53ef\u4ee5\u533a\u5206\u51fa\u4e00\u4e9b channel \u7684\u4f7f\u7528\u573a\u666f\u3002<\/p>\n
\u6ca1\u6709\u6570\u636e\u7684 channel \u7684\u4f7f\u7528\u573a\u666f\uff1a<\/p>\n
    \n
  • goroutine A \u901a\u8fc7 channel \u544a\u8bc9 goroutine B\uff1a\u201d\u8bf7\u505c\u6b62\u6b63\u5728\u505a\u7684\u4e8b\u60c5\u201c<\/li>\n
  • goroutine A \u901a\u8fc7 channel \u544a\u8bc9 goroutine B\uff1a\u201d\u6211\u5b8c\u6210\u4e86\u8981\u505a\u7684\u4e8b\u60c5\uff0c\u4f46\u662f\u6ca1\u6709\u4efb\u4f55\u7ed3\u679c\u9700\u8981\u53cd\u9988\u201c<\/li>\n<\/ul>\n
    \u901a\u77e5\u7684\u65b9\u5f0f\u4e00\u822c\u662f close \u64cd\u4f5c\uff0cgoroutine A \u5bf9 channel \u6267\u884c\u4e86 close \u64cd\u4f5c\uff0c\u800c goruntine B \u5f97\u5230 channel \u5df2\u7ecf\u88ab\u5173\u95ed\u8fd9\u4e2a\u4fe1\u606f\u540e\u53ef\u4ee5\u6267\u884c\u76f8\u5e94\u7684\u5904\u7406\u3002\u4f7f\u7528\u6ca1\u6709\u6570\u636e\u7684 channel \u7684\u597d\u5904\uff1a\u4e00\u4e2a goroutine \u53ef\u4ee5\u540c\u65f6\u7ed9\u591a\u4e2a goroutine \u53d1\u9001\u6d88\u606f\uff0c\u53ea\u662f\u8fd9\u4e2a\u6d88\u606f\u4e0d\u643a\u5e26\u989d\u5916\u7684\u6570\u636e\uff0c\u6240\u4ee5\u5e38\u88ab\u7528\u4e8e\u6279\u91cf goruntine \u7684\u9000\u51fa\u3002<\/p>\n
    \u5bf9\u4e8e\u8fd9\u79cd\u4e0d\u643a\u5e26\u6570\u636e\uff0c\u53ea\u662f\u4f5c\u4e3a\u4fe1\u53f7\u7684 channel\uff0c\u4e00\u822c\u4f7f\u7528\u5982\u4e0b\uff1a<\/p>\n
    ch := make(chan struct{}) ch <- struct{}{} <- ch <\/code><\/pre>\n
    \u5e26\u6709\u6570\u636e\u7684 channel \u7684\u4f7f\u7528\u573a\u666f\uff1a<\/p>\n
      \n
    • goroutine A \u901a\u8fc7 channel \u544a\u8bc9 goroutine B\uff1a\u201d\u8bf7\u6839\u636e\u6211\u4f20\u9012\u7ed9\u4f60\u7684\u6570\u636e\u5f00\u59cb\u505a\u4e00\u4ef6\u4e8b\u60c5\u201c<\/li>\n
    • goroutine A \u901a\u8fc7 channel \u544a\u8bc9 goroutine B\uff1a\u201d\u6211\u5b8c\u6210\u4e86\u8981\u505a\u7684\u4e8b\u60c5\uff0c\u8bf7\u63a5\u6536\u6211\u4f20\u9012\u7684\u6570\u636e\uff08\u7ed3\u679c\uff09\u201c<\/li>\n<\/ul>\n
      \u901a\u77e5\u7684\u65b9\u5f0f\u5c31\u662f goroutine A \u6267\u884c send \u53d1\u9001\u6570\u636e\uff0c\u800c goroutine B \u6267\u884c receive \u63a5\u6536\u6570\u636e\u3002channel \u643a\u5e26\u7684\u6570\u636e\u53ea\u80fd\u88ab\u4e00\u4e2a goruntine \u5f97\u5230\uff0c\u4e00\u4e2a goruntine \u53d6\u8d70\u6570\u636e\u540e\u8fd9\u4efd\u6570\u636e\u5728 channel \u91cc\u5c31\u4e0d\u590d\u5b58\u5728\u4e86\u3002<\/p>\n
      \u5bf9\u4e8e\u9700\u8981\u643a\u5e26\u6570\u636e\u7684 channel\uff0c\u4e00\u822c\u53c8\u53ef\u4ee5\u5206\u6210\u5e26\u6709 buffer \u7684 channel \uff08 bufferd channel \uff09\u548c\u4e0d\u5e26 buffer \u7684 channel \uff08 unbufferd channel \uff09\u3002<\/p>\n
      unbufferd channel<\/h3>\n
      \u5bf9\u4e8e unbufferd channel\uff0c\u4e0d\u5b58\u50a8\u4efb\u4f55\u6570\u636e\uff0c\u53ea\u8d1f\u8d23\u6570\u636e\u7684\u6d41\u901a\uff0c\u5e76\u4e14\u6570\u636e\u7684\u63a5\u6536\u4e00\u5b9a\u53d1\u751f\u5728\u6570\u636e\u53d1\u9001\u5b8c\u6210\u4e4b\u524d\u3002\u66f4\u8be6\u7ec6\u7684\u89e3\u91ca\u662f\uff0cgoroutine A \u5728\u5f80 channel \u53d1\u9001\u6570\u636e\u5b8c\u6210\u4e4b\u524d\uff0c\u4e00\u5b9a\u6709 goroutine B \u5728\u7b49\u7740\u4ece\u8fd9\u4e2a channel \u63a5\u6536\u6570\u636e\uff0c\u5426\u5219\u53d1\u9001\u5c31\u4f1a\u5bfc\u81f4\u53d1\u9001\u7684 goruntine \u88ab block \u4f4f\uff0c\u6240\u4ee5\u53d1\u9001\u548c\u63a5\u6536\u7684 goruntine \u662f\u8026\u5408\u7684\u3002<\/p>\n
      \u770b\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u5f80 ch \u53d1\u9001\u6570\u636e\u65f6\u5c31\u4f7f main gouruntine \u88ab\u6c38\u4e45 block \u4f4f\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u6b7b\u9501\u3002<\/p>\n
      func main() {     var ch = make(chan string)     ch <- \"hello\" \/\/fatal error: all goroutines are asleep - deadlock! goroutine 1 [chan send]:     fmt.Println(<-ch) } <\/code><\/pre>\n
      \u6709\u4eba\u53ef\u80fd\u4f1a\u8003\u8651\u5c06\u63a5\u6536\u64cd\u4f5c\u653e\u5230\u524d\u9762\uff0c\u4e0d\u5e78\u7684\u662f\u4ecd\u7136\u5bfc\u81f4\u4e86\u6b7b\u9501\uff0c\u56e0\u4e3a channel \u91cc\u6ca1\u6709\u6570\u636e\uff0c\u5f53\u524d goruntine \u4e5f\u4f1a\u88ab block \u4f4f\uff0c\u5bfc\u81f4\u7a0b\u5e8f\u6b7b\u9501\u3002<\/p>\n
      func main() {     var ch = make(chan string)     fmt.Println(<-ch) \/\/fatal error: all goroutines are asleep - deadlock! goroutine 1 [chan receive]:     ch <- \"hello\" } <\/code><\/pre>\n
      \u8fd9\u6b21\uff0c\u6211\u4eec\u5728\u53e6\u4e00\u4e2a goruntine \u4e2d\u6267\u884c receive\uff0c\u7a0b\u5e8f\u5c31\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u4e86\u3002\u56e0\u4e3a\u5728 main goruntine \u53d1\u9001\u5b8c\u6570\u636e\u4e4b\u524d\uff0csub goroutine \u5df2\u7ecf\u5728\u7b49\u5f85\u63a5\u6536\u6570\u636e\u3002<\/p>\n
      func main() {     var ch = make(chan string)     go func() {         fmt.Println(<-ch) \/\/out: hello     }()     ch <- \"hello\" } <\/code><\/pre>\n
      \u518d\u770b\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u6211\u4eec\u671f\u671b\u5728 sub goruntine \u4e2d\u6253\u5370 10 \u4e2a\u6570\uff0c\u5b9e\u9645\u4e0a\u5374\u53ea\u6709 main goruntine \u6253\u5370\u4e86 hello \u3002\u56e0\u4e3a\u5728 sub goruntine \u6253\u5370\u4e4b\u524d\uff0cmain goruntine \u5c31\u5df2\u7ecf\u6267\u884c\u5b8c\u6210\u5e76\u9000\u51fa\u4e86\u3002<\/p>\n
      func main() {     go func() {         for i := 0; i < 10; i++ {             fmt.Printf(\"%d \", i)         }     }()     fmt.Println(\"hello\") } <\/code><\/pre>\n
      \u8fd9\u4e2a\u65f6\u5019\u5c31\u53ef\u4ee5\u7528\u4e00\u4e2a unbufferd channel \u6765\u8ba9\u4e24\u4e2a goruntine \u4e4b\u95f4\u6709\u4e00\u4e9b\u901a\u4fe1\uff0c\u8ba9 main goruntine \u6536\u5230 sub goruntine \u901a\u77e5\u540e\u518d\u9000\u51fa\u3002\u5728\u8fd9\u79cd\u573a\u666f\u4e2d\uff0cchannel \u5e76\u4e0d\u643a\u5e26\u4efb\u4f55\u6570\u636e\uff0c\u53ea\u662f\u8d77\u5230\u4e00\u4e2a\u4fe1\u53f7\u7684\u4f5c\u7528\u3002<\/p>\n
      func main() {     var ch = make(chan string)     go func() {         for i := 0; i < 10; i++ {             fmt.Printf(\"%d \", i)         }         ch <- \"exit\"     }()     fmt.Println(\"hello\")     <-ch } <\/code><\/pre>\n
      bufferd channel<\/h3>\n
      \u5bf9\u5e26\u6709\u7f13\u51b2\u533a\u7684 channel \u6267\u884c send \u548c receive \u64cd\u4f5c\uff0c\u5176\u884c\u4e3a\u548c\u4e0d\u5e26\u7f13\u51b2\u533a\u7684 channel \u4e0d\u592a\u4e00\u6837\u3002\u7ee7\u7eed\u8ba8\u8bba\u6700\u5f00\u59cb\u7684\u4f8b\u5b50\uff0c\u4e0d\u8fc7\u8fd9\u6b21\u7684 channel \u662f\u4e00\u4e2a size=1 \u7684 bufferd channel\uff0c\u5c06\u6570\u636e\u53d1\u9001\u7ed9 channel \u540e\uff0c\u6570\u636e\u88ab\u62f7\u8d1d\u5230 channel \u7684\u7f13\u51b2\u533a\uff0cgoruntine \u7ee7\u7eed\u5f80\u540e\u6267\u884c\uff0c\u6240\u4ee5\u7a0b\u5e8f\u53ef\u4ee5\u6b63\u5e38\u5de5\u4f5c\u3002<\/p>\n
      func main() {     var ch = make(chan string, 1)     ch <- \"hello\"     fmt.Println(<-ch) \/\/hello } <\/code><\/pre>\n
      \u4f46\u662f\u5f53\u6211\u4eec\u8c03\u6362\u53d1\u9001\u548c\u63a5\u6536\u7684\u987a\u5e8f\u65f6\uff0c\u7a0b\u5e8f\u53c8\u8fdb\u5165\u4e86\u6b7b\u9501\u3002\u56e0\u4e3a\u5f53 channel \u91cc\u6ca1\u6709\u6570\u636e\u65f6\uff08\u5e72\u6db8\uff09\uff0c\u6267\u884c receive \u7684 goroutine \u4e5f\u4f1a\u88ab block \u4f4f\uff0c\u6700\u7ec8\u5bfc\u81f4\u4e86\u6b7b\u9501\u3002<\/p>\n
      func main() {     var ch = make(chan string, 1)     fmt.Println(<-ch) \/\/fatal error: all goroutines are asleep - deadlock! goroutine 1 [chan receive]:     ch <- \"hello\" } <\/code><\/pre>\n
      \u6b64\u5916\uff0cbuffer size=1 \u548c buffer size>1 \u7684 channel \u5bf9\u4e8e\u6570\u636e\u7684\u4ea4\u4ed8\u4e5f\u6709\u4e00\u4e9b\u7ec6\u5fae\u7684\u4e0d\u540c\uff1a<\/p>\n
        \n
      • \u5bf9\u4e8e buffer size=1 \u7684 channel\uff0c\u7b2c\u4e8c\u4e2a\u6570\u636e\u53d1\u9001\u5b8c\u6210\u4e4b\u524d\uff0c\u4e4b\u524d\u53d1\u9001\u7684\u7b2c\u4e00\u4e2a\u6570\u636e\u4e00\u5b9a\u88ab\u53d6\u8d70\u4e86\uff0c\u5426\u5219\u53d1\u9001\u4e5f\u4f1a\u88ab block \u4f4f\uff0c\u8fd9\u5176\u5b9e\u8bf4\u660e\u4e86\u6570\u636e\u7684\u4ea4\u4ed8\u5f97\u5230\u4e86\u5ef6\u8fdf\u4fdd\u8bc1\u3002<\/li>\n
      • \u5bf9\u4e8e buffer size>1 \u7684 channel\uff0c\u53d1\u9001\u6570\u636e\u65f6\uff0c\u4e4b\u524d\u53d1\u9001\u7684\u6570\u636e\u4e0d\u80fd\u4fdd\u8bc1\u4e00\u5b9a\u88ab\u53d6\u8d70\u4e86\uff0c\u5e76\u4e14 buffer size \u8d8a\u5927\uff0c\u6570\u636e\u7684\u4ea4\u4ed8\u5f97\u5230\u7684\u4fdd\u8bc1\u8d8a\u5c11\u3002\u4e5f\u6b63\u662f\u7531\u4e8e\u8fd9\u79cd\u65e0\u4fdd\u8bc1\u4ea4\u4ed8\uff0c\u51cf\u5c11\u4e86 goroutine \u4e4b\u95f4\u901a\u4fe1\u65f6\u7684\u963b\u585e\u5ef6\u8fdf\uff0c\u6839\u636e\u53d1\u9001\u6570\u636e\u3001\u63a5\u6536\u6570\u636e\u3001\u6570\u636e\u5904\u7406\u7684\u901f\u5ea6\u5408\u7406\u7684\u8bbe\u8ba1 buffer size\uff0c\u751a\u81f3\u53ef\u4ee5\u5728\u4e0d\u6d6a\u8d39\u7a7a\u95f4\u7684\u60c5\u51b5\u4e0b\u505a\u5230\u6ca1\u6709\u4efb\u4f55\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n
        \u5982\u679c channel buffer \u5df2\u7ecf\u585e\u6ee1\u4e86\u6570\u636e\uff0c\u7ee7\u7eed\u6267\u884c\u53d1\u9001\u4f1a\u5bfc\u81f4\u5f53\u524d goruntine \u88ab block \u4f4f\uff08\u963b\u585e\uff09\uff0c\u76f4\u5230 channel \u4e2d\u7684\u6570\u636e\u88ab\u53d6\u8d70\u4e00\u90e8\u5206\u624d\u53ef\u4ee5\u7ee7\u7eed\u5411 channel \u53d1\u9001\u6570\u636e\u3002<\/p>\n
        \u901a\u8fc7 channel buffer\uff0c\u89e3\u8026\u4e86\u53d1\u9001\u548c\u63a5\u6536\u7684 goruntine \u3002\u9700\u8981\u5c0f\u5fc3\u7684\u662f\uff0cbuffered channel \u867d\u7136\u53ef\u4ee5\u770b\u505a\u4e00\u4e2a\u7f13\u5b58\u6d88\u606f\u7684\u961f\u5217\uff0c\u4f46\u662f\u5176\u4e3b\u8981\u7528\u9014\u8fd8\u662f\u7528\u4e8e\u591a\u4e2a goruntine \u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u5355\u4e2a goruntine \u4e2d\u4e0d\u8981\u4f7f\u7528 buffered channel \u6765\u505a\u7f13\u5b58\u961f\u5217\uff0csend \u548c receive \u64cd\u4f5c\u5f88\u5bb9\u8ba9 goruntine \u88ab\u6c38\u4e45 block \u4f4f\u5bfc\u81f4\u6574\u4e2a\u7a0b\u5e8f\u6b7b\u9501\uff0c\u4e0a\u9762\u7684 demo \u4e5f\u8bf4\u660e\u4e86\u8fd9\u4ef6\u4e8b\u60c5\u3002<\/p>\n
        \u518d\u770b\u4e0b\u9762\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u4e00\u4e2a\u7b80\u5355\u7684\u751f\u4ea7\u6d88\u8d39\u8005\u6a21\u578b\uff0cmanager \u6bcf 200ms \u6709\u4e00\u4e2a\u65b0\u7684 work \u9700\u8981\u5206\u53d1\u7ed9 3 \u4e2a worker \u6765\u5b8c\u6210\uff0cmanager \u6bcf\u6b21\u90fd\u53ea\u662f\u5c06 work \u53d1\u9001\u5230\u4e00\u4e2a channel \u4e2d\uff0cwork \u81ea\u52a8\u4ece channel \u4e2d\u53d6\u51fa work \u5e76\u5904\u7406\uff0c\u6bcf\u4e2a worker \u5b8c\u6210\u4e00\u4e2a work \u9700\u8981 1s \u7684\u65f6\u95f4\uff0cmanager \u7d2f\u8ba1\u5206\u53d1 10 \u4e2a work\uff0c\u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u53d1\u73b0\u6ca1\u6709\u963b\u585e\u3002\u4f46\u662f\u5982\u679c manager \u7ee7\u7eed\u4e0d\u505c\u5730\u5206\u53d1 work\uff0c\u5c31\u4f1a\u53d1\u73b0 channel \u7f13\u51b2\u533a\u88ab\u585e\u6ee1\uff0cmanager \u603b\u662f\u5728\u7b49\u5f85 worker \u3002\u6240\u4ee5\uff0c\u6839\u636e\u5904\u7406\u9700\u6c42\uff0c\u5408\u7406\u7684\u8bbe\u8ba1 worker \uff08 goruntine \uff09\u6570\u91cf\u548c channel buffer size \u975e\u5e38\u91cd\u8981\u3002<\/p>\n
        package main  import (     \"fmt\"     \"math\/rand\"     \"strconv\"     \"time\" )  func main() {     fmt.Println(\"\u55e8\u5ba2\u7f51(www.haicoder.net)\")      const cap = 3     ch := make(chan string, cap)      for index := 0; index < cap; index++ {         go func() {             for p := range ch {                 fmt.Println(\"Worker received: \", p)                 time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)             }         }()     }      worknum := 10     for index := 0; index < worknum; index++ {         time.Sleep(time.Duration(rand.Intn(200)) * time.Millisecond)         work := \"work \" + strconv.Itoa(index)         select {         case ch <- work:             fmt.Println(\"Manager: send a work\")         default:             fmt.Println(\"Manager: wait worker\")         }     }      close(ch) } <\/code><\/pre>\n
        \u8fd0\u884c\u540e\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
        \"\u8c08\u8c08<\/p>\n
        \u6211\u4eec\u4f7f\u7528\u4e86 channel\uff0c\u5b9e\u73b0\u4e86\u534f\u7a0b\u7684\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
        \"\u8c08\u8c08<\/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":"
          \u8c08\u8c08 Golang \u7f13\u51b2\u4e0e\u65e0\u7f13\u51b2 …<\/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\/204935"}],"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=204935"}],"version-history":[{"count":1,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/204935\/revisions"}],"predecessor-version":[{"id":204941,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/204935\/revisions\/204941"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=204935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=204935"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=204935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}