{"id":155845,"date":"2020-09-09T22:02:43","date_gmt":"2020-09-09T14:02:43","guid":{"rendered":"http:\/\/4563.org\/?p=155845"},"modified":"2020-09-09T22:02:43","modified_gmt":"2020-09-09T14:02:43","slug":"%e5%a4%a7%e4%bd%ac%e5%b8%ae%e7%9c%8b%e4%b8%80%e4%b8%8b%e4%bb%a3%e7%a0%81%ef%bc%8c%e4%b8%ba%e4%bb%80%e4%b9%88%e4%bc%9a%e5%81%b6%e5%b0%94%e6%8a%a5%e9%94%99-panic-send-on-closed-channel","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=155845","title":{"rendered":"\u5927\u4f6c\u5e2e\u770b\u4e00\u4e0b\u4ee3\u7801\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u5076\u5c14\u62a5\u9519 panic: send on closed channel"},"content":{"rendered":"
\n
\n
\n

\u5927\u4f6c\u5e2e\u770b\u4e00\u4e0b\u4ee3\u7801\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u5076\u5c14\u62a5\u9519 panic: send on closed channel <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : qiqiyeshi <\/span> <\/i> 2<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n
func main() {  ch := make(chan int)   for i := 0; i < 5; i++ {    i := i   go func() {    ch <- i    close(ch)   }()   }   for c := range ch {   println(c)  }   } <\/code><\/pre>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (10<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : 996635 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0d\u662f\u4f60\u81ea\u5df1 close \u7684\u4e48?                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : zwpaper <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 `close(ch)`<\/p>\n
    \u4f60\u5173\u4e86 5 \u6b21 ch\uff0c\u770b 6 \u4e2a Goroutine \u7684\u8c03\u5ea6\u987a\u5e8f\uff0c\u53ea\u8981\u6709 \u4e00\u4e2a ch <- i \u5728 close \u4e4b\u540e\u6267\u884c\uff0c\u5c31 panic<\/p>\n
    \u4f60\u80af\u5b9a\u4f1a\u95ee\u4e3a\u4ec0\u4e48\u6709\u65f6\u5019\u4f1a\u6b63\u5e38\u9000\u51fa\uff0c\u56e0\u4e3a\u5728 close \u4e4b\u540e\uff0crange ch \u5148\u6267\u884c\uff0c\u7136\u540e main \u9000\u51fa\uff0c\u5176\u5b83 ch <- i \u6ca1\u6709\u88ab\u6267\u884c\u5230                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : monkeyWie <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6539\u4e00\u4e0b\uff1a
    “`
    func main() {
     ch := make(chan int)
     var wg sync.WaitGroup
     wg.Add(5)
     go func() {
     wg.Wait()
     close(ch)
     }()<\/p>\n
     for i := 0; i < 5; i++ {<\/p>\n
     i := i
     go func() {
     ch <- i
     wg.Done()
     }()<\/p>\n
     }<\/p>\n
     for c := range ch {
     println(c)
     }
    }
    “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : monkeyWie <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4ee3\u7801\u683c\u5f0f\u5316\u6211\u88c2\u5f00\u4e86\uff0c\u8fd8\u662f\u76f4\u63a5\u8d34\u94fe\u63a5\u5427\uff1a https:\/\/play.golang.org\/p\/kY32r_P92Gh                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : raaaaaar <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u4e0d\u80fd\u4fdd\u8bc1\u4e24\u4e2a\u5faa\u73af\u8c01\u5148\u7ed3\u675f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : araraloren <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u662f\u81ea\u5df1\u90fd\u6ca1\u641e\u61c2\u4ee3\u7801\u903b\u8f91\u3002\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : MajorAdam <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5a1c\u5854\u8389\u7684\u5934\u50cf                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : qiqiyeshi <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @zwpaper \u662f\u7684 \u786e\u5b9e\u662f\u8fd9\u6837                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : qiqiyeshi <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @monkeyWie \u8c22\u8c22\uff0c\u8fd9\u4e2a\u89e3\u51b3\u4e86\u95ee\u9898\uff0c\u6211\u539f\u6765\u7684\u6d4b\u8bd5\u4ee3\u7801\u5199\u7684\u5176\u5b9e\u662f\u6709\u95ee\u9898\u7684                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : qiqiyeshi <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8c22\u8c22\u5927\u5bb6\u7684\u5206\u6790\uff01                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    \u5927\u4f6c\u5e2e\u770b\u4e00\u4e0b\u4ee3\u7801\uff0c\u4e3a\u4ec0\u4e48\u4f1a\u5076\u5c14\u62a5\u9519…<\/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\/155845"}],"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=155845"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/155845\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=155845"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=155845"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=155845"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}