{"id":396987,"date":"2021-03-18T04:12:32","date_gmt":"2021-03-17T20:12:32","guid":{"rendered":"http:\/\/4563.org\/?p=396987"},"modified":"2021-03-18T04:12:32","modified_gmt":"2021-03-17T20:12:32","slug":"golang-%e5%8d%8f%e7%a8%8b%e8%af%bb%e5%86%99%e4%b8%8a%e4%b8%8b%e6%96%87%e5%8f%98%e9%87%8f-%e4%b8%80%e7%9b%b4%e4%b8%ba-0","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=396987","title":{"rendered":"golang \u534f\u7a0b\u8bfb\u5199\u4e0a\u4e0b\u6587\u53d8\u91cf \u4e00\u76f4\u4e3a 0"},"content":{"rendered":"
\n
\n
\n

golang \u534f\u7a0b\u8bfb\u5199\u4e0a\u4e0b\u6587\u53d8\u91cf \u4e00\u76f4\u4e3a 0 <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : xuletter2021 <\/span> <\/i> 1<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\u5982\u4ee3\u7801 1\uff1a\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u65e0\u8bba sleep \u591a\u4e45\uff0c\u8f93\u51fa\u90fd\u662f 0<\/p>\n

func main() {  var x int  go func() {   for {    x++   }  }()  time.Sleep(time.Duration(10) * time.Second)  fmt.Println(\"**************\")  fmt.Println(x)  fmt.Println(\"**************\") } <\/code><\/pre>\n
\u5982\u4ee3\u7801 2\uff1a\u5728\u4e0a\u9762\u7b2c\u516d\u884c\u52a0\u4e86\u70b9\u4ee3\u7801\u5c31\u8f93\u51fa\u5c31\u53d8\u4e86\uff0c\u4e00\u76f4\u4e0d\u660e\u767d\u4e3a\u4ec0\u4e48<\/p>\n
func main() {  var x int  go func() {   for {    x++    \/\/ select()    \/\/ or    \/\/ fmt.Println(\"ddd\")   }  }()  time.Sleep(time.Duration(1) * time.Second)  fmt.Println(\"**************\")  fmt.Println(x)  fmt.Println(\"**************\") } <\/code><\/pre>\n
\u6c42\u5927\u4f6c\u6307\u70b9<\/p>\n<\/p><\/div>\n
 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (24<\/span>)        <\/div>\n
 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
    \n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lozzow <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6807\u8bb0\u7b49\u4e2a\u7b54\u6848                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Orlion <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4f60\u5173\u95ed\u4f18\u5316\u8dd1\u4e00\u904d\u770b\u770b\u662f\u4e0d\u662f\u51fa\u6765\u4e86\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : xuletter2021 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u5173\u95ed\u5185\u8054\u4f18\u5316 “`go build -gcflags “-N -l” testX.go“`\uff0c\u7ed3\u679c\u8fd8\u662f\u4e00\u6837                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : darrh00 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4ee3\u7801\u8bfb\u5199 x \u53d8\u91cf\u6709 data race, go build -race \u540e\u518d\u8dd1\u4e00\u904d\u5c31\u77e5\u9053\u539f\u56e0\u4e86\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : plantparknet <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 “`
    func main() {
     var x int
     go func(x *int) {
     for {
     *x ++
     }
     }(&x)
     time.Sleep(time.Duration(10) * time.Second)
     fmt.Println(“**************”)
     fmt.Println(x)
     fmt.Println(“**************”)
    }
    “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : carlclone <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6211\u731c\u662f\u88ab\u7f16\u8bd1\u5668\u4f18\u5316\u6389\u4e86\uff0c\u628a\u6c47\u7f16\u4ee3\u7801\u8f93\u51fa\u51fa\u6765\u770b\u770b                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : dreasky <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u591a\u4e2a\u7ebf\u7a0b\u8bfb\u5199\u540c\u4e00\u4e2a\u8d44\u6e90\u52a0\u9501\u5427
    “`
    func main() {
     var x int64
     go func() {
     for {
     atomic.AddInt64(&x, 1)
     }
     }()
     time.Sleep(10 * time.Second)
     fmt.Println(“**************”)
     fmt.Println(atomic.LoadInt64(&x))
     fmt.Println(“**************”)
    }
    “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : xuletter2021 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @carlclone \u55ef\uff0c\u6211\u4e5f\u60f3\u77e5\u9053\u7f16\u8bd1\u5668\u5982\u4f55\u5904\u7406\u7684\uff0c\u6570\u636e\u7ade\u4e89\u662f\u786e\u5b9e\u7684\uff0c\u4f46\u4e3a\u4ec0\u4e48\u8fd9\u6837\u5c31\u6ca1\u6709\u7ade\u4e89\u4e86\u5462
    “`
    func main() {
     var x int
     go func() {
     for {
     x++
     fmt.Println(“ddd”)
     }
     }()
     time.Sleep(time.Duration(2) * time.Second)
     fmt.Println(“**************”)
     fmt.Println(x)
     fmt.Println(“**************”)
    }
    “`<\/p>\n
    \u6267\u884c\u4e0a\u9762\u7684\u4ee3\u7801
    “`
     ~\/go\/src\/awesomeProject\/test go run -race testX.go | grep -v ‘ddd’  
    **************
    676626
    **************
    “`                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : dreasky <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 https:\/\/qcrao.com\/2019\/06\/17\/cch-says-memory-reorder\/                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : whee1 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u662f\u672a\u5b9a\u4e49\u7684\u884c\u4e3a\u3002
    \u4f60\u8981\u5e76\u53d1\u64cd\u4f5c x\uff0c\u9700\u8981\u5b83\u662f\u539f\u5b50\u7684\u6216\u8005\u7528 channel \u4f20\u503c\uff0c\u6216\u8005\u52a0\u9501\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : carlclone <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6c47\u7f16\u4ee3\u7801 \uff1a https:\/\/paste.ubuntu.com\/p\/67nDFqJXVN\/ \uff0c \u770b\u6700\u4e0b\u9762\u7684 4 \u884c\uff0c\u786e\u5b9e\u88ab\u4f18\u5316\u6389\u4e86 d.go 11,12 \u884c\u662f for \u548c x++                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : 777777 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8c03\u7528 print \u7684\u65f6\u5019\u4f1a\u4ea7\u751f\u7cfb\u7edf\u8d44\u6e90\u8c03\u7528\uff0c\u6240\u4ee5\u6ca1\u88ab\u4f18\u5316                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : jasonkayzk <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @carlclone \u6211\u5c1d\u8bd5\u7981\u7528\u7f16\u8bd1\u4f18\u5316\uff1ago build -gcflags ‘-N’ main.go
    \u53d1\u73b0\u7ed3\u679c\u8fd8\u662f 0 \uff01\u8fd9\u662f\u5565\u60c5\u51b5= =\uff1b                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : whoami9894 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u6574\u4e2a goroutine \u533f\u540d\u51fd\u6570\u88ab\u4f18\u5316\u6389\u4e86
    0x0045 00069 (.t.go:8) MOVQ “”.&x+24(SP), AX
    0x004a 00074 (.t.go:8) INCQ (AX)                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : darrh00 <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u90fd\u53d1\u751f data race \u4e86\uff0c\u7a0b\u5e8f\u7684\u884c\u4e3a\u5c31\u662f\u672a\u5b9a\u4e49\u884c\u4e3a\uff0c\u8ddf\u8f93\u51fa\u503c\u662f\u4e0d\u662f 0 \u6709\u4efb\u4f55\u5173\u7cfb\uff1f \u4ee5\u4e3a\u8f93\u51fa\u503c\u4e0d\u662f 0\uff0c\u7a0b\u5e8f\u5c31\u5bf9\u4e86\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : RedBlackTree <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e24\u4e2a goroutine\uff0c\u5728\u4e24\u4e2a\u7ebf\u7a0b\u3001\u4e24\u4e2a CPU \u4e0a\u6267\u884c\uff0c\u4f60\u4e0d\u5bf9\u5171\u4eab\u5185\u5b58\u7684\u8bfb\u5199\u8fdb\u884c\u540c\u6b65\u64cd\u4f5c\uff0cA \u5728\u5199 A \u7684 cache \u91cc\u7684 x\uff0cB \u5728\u8bfb B \u7684 cache \u91cc\u7684 x\uff0c\u600e\u4e48\u53ef\u80fd\u6709\u503c\u5462\uff1f                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : RedBlackTree <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u64cd\u4f5c\u7cfb\u7edf\u6ca1\u5b66\u597d\u5c31\u7b97\u4e86\uff0c\u7f5a\u4f60\u4eca\u5929\u665a\u4e0a\u628a Go Memory Model \u770b\u4e09\u904d\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : treblex <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 package main<\/p>\n
    import (
     “fmt”
     “time”
    )<\/p>\n
    func main() {
     var x = 0<\/p>\n
     go func(_x *int) {
     *_x++
     }(&x)<\/p>\n
     time.Sleep(time.Second * 3)
     fmt.Print(x)
    }                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Linxing <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 go \u7684\u5e76\u53d1\u6a21\u578b\u4e86\u89e3\u4e0b\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : Orlion <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 @xuletter2021 \u786e\u5b9e\u7ed3\u679c\u4e00\u6837\uff0c\u4e0d\u8fc7\u5173\u95ed\u4f18\u5316\u524d\u540e\u6253\u5370\u6c47\u7f16\u7ed3\u679c\u8fd8\u662f\u6709\u533a\u522b\u7684\uff0c\u867d\u7136\u5173\u95ed\u4f18\u5316\u540e\u7684 go \u51fa\u6765\u7684\u51fd\u6570\u4e2d\u8fd8\u662f\u6ca1\u6709 x++\u5bf9\u5e94\u7684\u6c47\u7f16\u4ee3\u7801\uff08\u4e0d\u592a\u80fd\u7406\u89e3\u7684…\uff09\u3002<\/p>\n
    \u4e0b\u9762\u662f\u6211\u7684\u731c\u6d4b\uff1a<\/p>\n
    \u5728 1.14 \u4e4b\u524d\u534f\u7a0b\u8c03\u5ea6\u662f\u51fa\u8ba9\u5f0f\u800c\u975e\u62a2\u5360\u5f0f\u7684\uff0c\u5982\u679c\u8fd9\u6bb5\u4ee3\u7801\u5728\u5355\u6838\u673a\u5668\u4e0a\u8fd0\u884c\uff0c\u5c31\u6709\u53ef\u80fd\u9677\u5165\u5230 for {…}\u7684\u6b7b\u5faa\u73af\u4e2d\u800c\u4e3b\u534f\u7a0b\u4e2d\u7684\u4ee3\u7801\u5f97\u4e0d\u5230\u8c03\u5ea6\u6267\u884c\uff0c\u800c\u4f60 for \u5faa\u73af\u4e2d\u52a0\u5165\u4e86 fmt.Pxxx \u7c7b\u7684\u4ee3\u7801\u5c31\u80fd\u591f\u4f7f\u5b50\u534f\u7a0b\u51fa\u8ba9\u6267\u884c\u6743\u3002<\/p>\n
    \u53e6\u5916\u8fd9\u6bb5\u4ee3\u7801\u8fd8\u6709\u53ef\u89c1\u6027\u95ee\u9898\uff0c\u5b50\u534f\u7a0b\u5bf9\u5168\u5c40\u53d8\u91cf\u7684\u4fee\u6539\uff0c\u4e3b\u534f\u7a0b\u53ef\u80fd\u662f\u770b\u4e0d\u5230\u7684\u3002<\/p>\n
    \u57fa\u4e8e\u4e0a\u9762\u4e24\u4e2a\u95ee\u9898\u7684\u8003\u8651\uff0c\u7f16\u8bd1\u5668\u505a\u51fa\u4e86\u201c\u9519\u8bef\u201d\u4f18\u5316\uff0c\u5bfc\u81f4\u4e86\u4f60\u6240\u770b\u5230\u7684\u7ed3\u679c\u3002                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lysS <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u88ab\u4f18\u5316\u4e86\uff08\u4f0a\uff0c\u600e\u4e48\u611f\u89c9\u4e56\u4e56\u7684\uff09
    \u4f60\u628a \/\/ fmt.Println(“ddd”)\u7684\u6ce8\u91ca\u53d6\u6d88\u6709\u53ef\u4ee5\u4e86                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : lewinlan <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u4e0a\u8bf4\u7684\u7f13\u5b58\u95ee\u9898\u7684\u786e\u503c\u5f97\u5b66\u4e60\uff0c\u4f46\u5e94\u8be5\u4e0d\u662f\u8fd9\u4e2a\u95ee\u9898\u7684\u539f\u56e0\uff0c10 \u79d2\u600e\u4e48\u5f97\u4e5f\u5237\u5230 L3 \u4e86\u624d\u5bf9\u3002
    \u770b\u4e86\u4e0b\u6c47\u7f16\uff0c\u4f18\u5316\u6210\u4e86\u7a7a\u5faa\u73af\u4e86\uff0c\u6240\u4ee5\u5e94\u8be5\u662f\u4f18\u5316\u7684\u95ee\u9898\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : xfriday <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u8fd9\u4e2a\u95ee\u9898\u6211\u4e4b\u524d\u5728 github \u4e0a\u63d0\u8fc7 issue\uff0cgo \u7684\u7f16\u8bd1\u5668\u4f1a\u628a\u8fd9\u79cd\u60c5\u51b5\u4e0b\u7684\u4fee\u6539\u7684\u4ee3\u7801\u4f18\u5316\u6389\u7684\uff0c\u4e5f\u53ea\u6709 golang \u4f1a\u8fd9\u4e48\u505a\uff0c\u522b\u7684\u8bed\u8a00\u53ea\u662f\u4e0d\u4fdd\u8bc1\u53ef\u89c1\u6027\uff0c\u4f46\u6700\u7ec8\u4e00\u5b9a\u4f1a\u8bfb\u53d6\u5230\u65b0\u503c\uff08\u5e76\u975e\u6240\u6709\u573a\u666f\u90fd\u9700\u8981\u5b8c\u5168\u7684\u4e00\u81f4\u6027\u6027\uff09\uff0c\u5728 golang \u91cc\u5374\u6c38\u8fdc\u8bfb\u4e0d\u5230\u65b0\u503c\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n
    \n
    \n
     \u8cc7\u6df1\u5927\u4f6c : sikasjc <\/span>  <\/div>\n
     <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                 \u53ef\u4ee5\u770b\u8fd9\u91cc\uff0c\u540c\u6837\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u770b\u6c47\u7f16\u4ee3\u7801\u53d1\u73b0\u533a\u522b https:\/\/www.zhihu.com\/question\/434964023                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
  • \n","protected":false},"excerpt":{"rendered":"
    golang \u534f\u7a0b\u8bfb\u5199\u4e0a\u4e0b\u6587\u53d8\u91cf …<\/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\/396987"}],"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=396987"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/396987\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=396987"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=396987"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=396987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}