{"id":170,"date":"2026-08-18T02:14:06","date_gmt":"2026-08-17T18:14:06","guid":{"rendered":"http:\/\/www.plutoze.xyz\/?p=170"},"modified":"2026-08-18T18:51:56","modified_gmt":"2026-08-18T10:51:56","slug":"%e7%94%a8-go-%e5%86%99%e4%b8%80%e4%b8%aa-tcp-%e8%81%8a%e5%a4%a9%e5%ae%a4%ef%bc%9a%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3-goroutine-%e4%b8%8e-channel","status":"publish","type":"post","link":"http:\/\/www.plutoze.xyz\/index.php\/2026\/08\/18\/%e7%94%a8-go-%e5%86%99%e4%b8%80%e4%b8%aa-tcp-%e8%81%8a%e5%a4%a9%e5%ae%a4%ef%bc%9a%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3-goroutine-%e4%b8%8e-channel\/","title":{"rendered":"\u7528 Go \u5199\u4e00\u4e2a TCP \u804a\u5929\u5ba4\uff1a\u6df1\u5165\u7406\u89e3 Goroutine \u4e0e Channel"},"content":{"rendered":"\n
\n

\u672c\u6587\u4ee5\u4e00\u4e2a\u5c0f\u578b TCP \u804a\u5929\u5ba4\u9879\u76ee\u4e3a\u4f8b\uff0c\u62c6\u89e3 Go \u5e76\u53d1\u7f16\u7a0b\u91cc\u6700\u91cd\u8981\u7684\u4e24\u4e2a\u6982\u5ff5\uff1agoroutine<\/strong> \u4e0e channel<\/strong>\uff0c\u5e76\u8bb2\u900f\u300c\u6bcf\u8fde\u63a5\u4e00\u4e2a\u534f\u7a0b\u300d\u300cfan-out \u5e7f\u64ad\u300d\u300cselect + \u8d85\u65f6\u300d\u300cchannel \u4e0e mutex \u5982\u4f55\u914d\u5408\u300d\u8fd9\u4e9b\u5b9e\u6218\u6a21\u5f0f\u3002<\/p>\n<\/blockquote>\n\n\n

\u4e00\u3001\u4e3a\u4ec0\u4e48\u8981\u5199\u8fd9\u4e2a\u804a\u5929\u5ba4<\/h2>\n\n\n

\u804a\u5929\u5ba4\u662f\u5b66\u4e60\u5e76\u53d1\u7684\u6559\u79d1\u4e66\u7ea7\u573a\u666f\uff1a\u670d\u52a1\u5668\u8981\u540c\u65f6\u670d\u52a1\u6210\u767e\u4e0a\u5343\u4e2a\u8fde\u63a5\uff0c\u6bcf\u4e2a\u8fde\u63a5\u90fd\u5728\u6536\u53d1\u6d88\u606f\uff0c\u4efb\u4f55\u4e00\u6761\u6d88\u606f\u90fd\u8981\u5b9e\u65f6\u5e7f\u64ad\u7ed9\u6240\u6709\u4eba\u3002\u8fd9\u5929\u7136\u903c\u51fa\u4e09\u4e2a\u95ee\u9898\uff1a<\/p>\n\n\n

    \n
  1. \u5982\u4f55\u540c\u65f6\u5904\u7406\u5927\u91cf\u8fde\u63a5\uff1f<\/strong> \u2014\u2014 \u7b54\u6848\uff1agoroutine\u3002<\/li>\n
  2. \u4e00\u4e2a\u8fde\u63a5\u6536\u5230\u7684\u6d88\u606f\uff0c\u5982\u4f55\u5b89\u5168\u5730\u9001\u5230\u5176\u4ed6\u6240\u6709\u8fde\u63a5\uff1f<\/strong> \u2014\u2014 \u7b54\u6848\uff1achannel\u3002<\/li>\n
  3. \u591a\u4e2a\u534f\u7a0b\u540c\u65f6\u8bfb\u5199\u300c\u5728\u7ebf\u7528\u6237\u8868\u300d\u600e\u4e48\u4e0d\u6253\u67b6\uff1f<\/strong> \u2014\u2014 \u7b54\u6848\uff1achannel + mutex \u914d\u5408\u3002<\/li>\n<\/ol>\n\n\n

    \u5148\u770b\u6574\u4f53\u67b6\u6784\u3002\u9879\u76ee\u7531\u4e09\u90e8\u5206\u7ec4\u6210\uff1a<\/p>\n\n\n

    .\n\u251c\u2500\u2500 main.go            # \u670d\u52a1\u7aef\u5165\u53e3\n\u251c\u2500\u2500 server.go          # \u670d\u52a1\u5668\uff1a\u76d1\u542c\u3001\u5e7f\u64ad\u3001\u8d85\u65f6\u8e22\u4eba\n\u251c\u2500\u2500 user.go            # \u7528\u6237\uff1a\u4e0a\u7ebf\/\u4e0b\u7ebf\u3001\u6536\u53d1\u6d88\u606f\n\u251c\u2500\u2500 client\/client.go   # \u547d\u4ee4\u884c\u5ba2\u6237\u7aef\n\u2514\u2500\u2500 testclient\/main.go # \u81ea\u52a8\u5316\u6d4b\u8bd5<\/code><\/pre>\n\n\n
    \u6838\u5fc3\u662f\u4e24\u4e2a\u7ed3\u6784\u4f53\uff1a<\/p>\n\n\n
    type Server struct {\n    Ip        string\n    Port      int\n    OnlineMap map[string]*User   \/\/ \u5728\u7ebf\u7528\u6237\u8868\n    MapLock   sync.RWMutex       \/\/ \u4fdd\u62a4 OnlineMap \u7684\u9501\n    Message   chan string        \/\/ \u5e7f\u64ad\u6d88\u606f\u7684\u4e2d\u592e\u961f\u5217\n}\n\ntype User struct {\n    Name   string\n    Addr   string\n    C      chan string   \/\/ \u8fd9\u4e2a\u7528\u6237\u4e13\u5c5e\u7684\u6536\u4fe1\u901a\u9053\n    conn   net.Conn      \/\/ \u5e95\u5c42 TCP \u8fde\u63a5\n    server *Server\n}<\/code><\/pre>\n\n\n
    \u6ce8\u610f\u4e24\u4e2a channel \u5b57\u6bb5\uff1aServer.Message<\/code> \u662f\u300c\u5168\u670d\u5e7f\u64ad\u7684\u4e2d\u592e\u961f\u5217\u300d\uff0cUser.C<\/code> \u662f\u300c\u6bcf\u4e2a\u7528\u6237\u4e13\u5c5e\u7684\u6536\u4fe1\u901a\u9053\u300d\u3002\u6574\u7bc7\u6587\u7ae0\u90fd\u4f1a\u56f4\u7ed5\u5b83\u4eec\u5c55\u5f00\u3002<\/p>\n\n\n
    \u4e8c\u3001Goroutine\uff1a\u6bcf\u4e2a\u8fde\u63a5\u4e00\u4e2a\u534f\u7a0b<\/h2>\n\n\n
    \u5b83\u4e3a\u4ec0\u4e48\u6bd4\u7ebf\u7a0b\u4fbf\u5b9c<\/h3>\n\n\n
    \u4f20\u7edf\u670d\u52a1\u5668\u8981\u4e48\u300c\u4e00\u4e2a\u7ebf\u7a0b\u4e00\u4e2a\u8fde\u63a5\u300d\uff08\u7ebf\u7a0b\u8d35\u3001\u4e0a\u4e0b\u6587\u5207\u6362\u91cd\u3001\u6210\u5343\u8fde\u63a5\u5c31\u6491\u4e0d\u4f4f\uff09\uff0c\u8981\u4e48\u7528\u590d\u6742\u7684\u4e8b\u4ef6\u5faa\u73af + \u56de\u8c03\uff08\u4ee3\u7801\u96be\u5199\uff09\u3002Go \u7684\u7b54\u6848\u662f goroutine<\/strong>\uff1a\u7531 Go \u8fd0\u884c\u65f6\u8c03\u5ea6\u7684\u8f7b\u91cf\u7ea7\u6267\u884c\u5355\u5143\uff0c\u521d\u59cb\u6808\u53ea\u6709\u51e0 KB\uff08\u4f1a\u6309\u9700\u589e\u957f\uff09\uff0c\u7531 M:N \u8c03\u5ea6\u5668\u628a\u6d77\u91cf goroutine \u6620\u5c04\u5230\u5c11\u91cf OS \u7ebf\u7a0b\u4e0a\u3002<\/p>\n\n\n
    \u6240\u4ee5\u4f60\u53ef\u4ee5\u300c\u5962\u4f88\u300d\u5730\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n
    func (this *Server) Start() {\n    Listener, err := net.Listen(\"tcp\", fmt.Sprintf(\"%s:%d\", this.Ip, this.Port))\n    \/\/ ...\n    go this.ListenMessager()      \/\/ \u540e\u53f0\u5e7f\u64ad\u5206\u53d1\u534f\u7a0b\n    for {\n        conn, err := Listener.Accept()\n        \/\/ ...\n        go this.Handler(conn)      \/\/ \u6bcf\u6765\u4e00\u4e2a\u8fde\u63a5\uff0c\u5c31\u5f00\u4e00\u4e2a\u534f\u7a0b\n    }\n}<\/code><\/pre>\n\n\n
    go<\/code> \u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u5c31\u4e3a\u6bcf\u4e2a\u8fde\u63a5\u72ec\u7acb\u5f00\u8f9f\u4e86\u4e00\u6761\u6267\u884c\u8def\u5f84\u3002Handler<\/code> \u91cc\u7684\u903b\u8f91\u56e0\u6b64\u53ef\u4ee5\u5199\u6210\u300c\u770b\u8d77\u6765\u662f\u987a\u5e8f\u6267\u884c\u300d\u7684\u963b\u585e\u5f0f\u4ee3\u7801\uff08conn.Read<\/code> \u963b\u585e\u7b49\u5f85\u6570\u636e\uff09\uff0c\u800c\u4e0d\u7528\u78b0\u56de\u8c03\u5730\u72f1\u3002\u8fd9\u662f Go \u5e76\u53d1\u7f16\u7a0b\u4f53\u9a8c\u4e0a\u6700\u5927\u7684\u723d\u70b9\u3002<\/p>\n\n\n
    \u6bcf\u4e2a\u7528\u6237\u4e5f\u6709\u81ea\u5df1\u7684\u534f\u7a0b<\/h3>\n\n\n
    \u8fde\u63a5\u8fdb\u6765\u65f6\uff0cNewUser<\/code> \u987a\u624b\u53c8\u5f00\u4e86\u4e00\u4e2a\u534f\u7a0b\uff0c\u4e13\u95e8\u8d1f\u8d23\u300c\u628a\u8fd9\u4e2a\u7528\u6237\u8981\u6536\u7684\u6d88\u606f\u5199\u56de\u8fde\u63a5\u300d\uff1a<\/p>\n\n\n
    func NewUser(conn net.Conn, server *Server) *User {\n    user := &User{\n        Name:   conn.RemoteAddr().String(),\n        C:      make(chan string),\n        conn:   conn,\n        server: server,\n    }\n    go user.ListenMessage()   \/\/ \u4e13\u804c\u300c\u53d1\u4fe1\u300d\u7684\u534f\u7a0b\n    return user\n}<\/code><\/pre>\n\n\n
    \u5230\u8fd9\u91cc\uff0c\u6bcf\u4e2a\u8fde\u63a5\u5b9e\u9645\u4e0a\u6709\u4e24\u6761 goroutine \u5728\u534f\u4f5c<\/strong>\uff1a\u4e00\u6761\u8d1f\u8d23\u8bfb\uff08\u5728 Handler<\/code> \u91cc\uff09\uff0c\u4e00\u6761\u8d1f\u8d23\u5199\uff08ListenMessage<\/code>\uff09\u3002\u8fd9\u5c31\u662f Go \u91cc\u975e\u5e38\u5e38\u89c1\u7684\u300c\u8bfb\u5199\u5206\u79bb\u3001\u7528 channel \u8fde\u63a5\u300d\u7684\u7ed3\u6784\u3002<\/p>\n\n\n
    \u4e09\u3001Channel\uff1aGo \u5e76\u53d1\u7684\u7075\u9b42<\/h2>\n\n\n
    Go \u793e\u533a\u6709\u53e5\u540d\u8a00\uff1a<\/p>\n\n\n
    \n
    \u4e0d\u8981\u901a\u8fc7\u5171\u4eab\u5185\u5b58\u6765\u901a\u4fe1\uff0c\u800c\u8981\u901a\u8fc7\u901a\u4fe1\u6765\u5171\u4eab\u5185\u5b58\u3002<\/strong><\/p>\n<\/blockquote>\n\n\n
    channel \u5c31\u662f\u300c\u901a\u8fc7\u901a\u4fe1\u5171\u4eab\u5185\u5b58\u300d\u7684\u8f7d\u4f53\u2014\u2014\u5b83\u662f\u4e00\u4e2a\u7c7b\u578b\u5316\u7684\u7ba1\u9053\uff0c\u4e00\u4e2a goroutine \u5f80\u91cc <-<\/code> \u53d1\uff0c\u53e6\u4e00\u4e2a\u5f80\u5916 <-<\/code> \u6536\uff0c\u6570\u636e\u7684\u6240\u6709\u6743\u5728\u4ea4\u63a5\u65f6\u81ea\u7136\u8f6c\u79fb\uff0c\u4e0d\u518d\u9700\u8981\u624b\u52a8\u52a0\u9501\u3002<\/p>\n\n\n
    \u4e24\u79cd channel<\/h3>\n\n\n
    make(chan string)     \/\/ \u65e0\u7f13\u51b2\uff1a\u53d1\u9001\u65b9\u5fc5\u987b\u7b49\u5230\u6709\u4eba\u63a5\u6536\u624d\u7b97\u5b8c\u6210\uff08\u540c\u6b65\u4f1a\u5408\uff09\nmake(chan string, 10) \/\/ \u6709\u7f13\u51b2\uff1a\u585e\u6ee1 10 \u4e2a\u4e4b\u524d\u53d1\u9001\u4e0d\u963b\u585e<\/code><\/pre>\n\n\n
    \u672c\u9879\u76ee\u7528\u7684\u662f\u65e0\u7f13\u51b2 channel<\/strong>\uff0c\u8bed\u4e49\u6700\u5e72\u51c0\uff1a<\/p>\n\n\n
    func (this *Server) Boardcast(user *User, msg string) {\n    sendMsg := \"[\" + user.Addr + \"]\" + user.Name + \":\" + msg\n    this.Message <- sendMsg   \/\/ \u963b\u585e\uff0c\u76f4\u5230\u5206\u53d1\u534f\u7a0b\u53d6\u8d70\n}<\/code><\/pre>\n\n\n
    this.Message <- sendMsg<\/code> \u8fd9\u884c\u4ee3\u7801\u540c\u65f6\u5728\u505a\u4e24\u4ef6\u4e8b\uff1a\u4f20\u9012\u6570\u636e<\/strong>\uff08\u6d88\u606f\u672c\u8eab\uff09\u548c\u505a\u540c\u6b65<\/strong>\uff08\u53d1\u9001\u65b9\u7b49\u63a5\u6536\u65b9\u51c6\u5907\u597d\uff09\u3002\u5f88\u591a\u4eba\u7b2c\u4e00\u6b21\u63a5\u89e6 channel \u4f1a\u56f0\u60d1\u300c\u8fd9\u4e0d\u8fc7\u662f\u4e2a\u961f\u5217\u300d\uff0c\u4f46\u65e0\u7f13\u51b2 channel \u771f\u6b63\u5f3a\u5927\u7684\u662f\u5b83\u7684\u540c\u6b65\u8bed\u4e49<\/strong>\u2014\u2014\u5b83\u50cf\u4e00\u4e2a\u63e1\u624b\uff0c\u628a\u5e76\u53d1\u4ee3\u7801\u7684\u65f6\u5e8f\u7ea6\u675f\u5199\u8fdb\u4e86\u7c7b\u578b\u7cfb\u7edf\u3002<\/p>\n\n\n
    \u56db\u3001\u6838\u5fc3\u6a21\u5f0f\u4e00\uff1a\u5e7f\u64ad\u7684 Fan-out<\/h2>\n\n\n
    \u8fd9\u662f\u672c\u9879\u76ee\u6700\u503c\u5f97\u5b66\u7684\u4e00\u6bb5\u4ee3\u7801\u3002\u6d88\u606f\u4ece\u300c\u67d0\u4eba\u53d1\u51fa\u300d\u5230\u300c\u6240\u6709\u4eba\u6536\u5230\u300d\uff0c\u8d70\u4e86\u4e00\u6761\u6e05\u6670\u7684\u6d41\u6c34\u7ebf\uff1a<\/p>\n\n\n
    \u7528\u6237 A \u53d1\u6d88\u606f\n   \u2502  Boardcast()\n   \u25bc\nServer.Message\uff08\u4e2d\u592e\u961f\u5217\uff09\n   \u2502  ListenMessager() \u5faa\u73af\u53d6\u51fa\n   \u25bc\n\u5206\u53d1\u5230 User.C \/ User.B.C \/ ...\uff08\u6bcf\u4eba\u4e00\u6761\u4e13\u5c5e\u901a\u9053\uff09\n   \u2502  ListenMessage() \u53d6\u51fa\n   \u25bc\n\u5199\u56de\u5404\u81ea\u7684 net.Conn<\/code><\/pre>\n\n\n
    func (this *Server) ListenMessager() {\n    for {\n        msg := <-this.Message        \/\/ \u2460 \u4ece\u4e2d\u592e\u961f\u5217\u53d6\u51fa\u4e00\u6761\n        this.MapLock.Lock()\n        for _, cli := range this.OnlineMap {\n            cli.C <- msg             \/\/ \u2461 \u6295\u9012\u7ed9\u6bcf\u4e2a\u5728\u7ebf\u7528\u6237\n        }\n        this.MapLock.Unlock()\n    }\n}<\/code><\/pre>\n\n\n
    \u8fd9\u4e2a\u6a21\u5f0f\u53eb fan-out\uff08\u6247\u51fa\uff09<\/strong>\uff1a\u4e00\u4e2a\u6e90\u5934\uff0c\u5206\u53d1\u7ed9\u591a\u4e2a\u6d88\u8d39\u8005\u3002\u7528 channel \u5b9e\u73b0\u5b83\u975e\u5e38\u81ea\u7136\u2014\u2014\u4e0d\u9700\u8981\u9501\u6765\u4fdd\u62a4\u6d88\u606f\u3001\u4e0d\u9700\u8981\u62c5\u5fc3\u300c\u53d1\u7ed9\u4e00\u534a\u65f6\u6709\u4eba\u4e0b\u7ebf\u300d\u3002<\/p>\n\n\n
    \u4f46\u8fd9\u91cc\u6709\u4e24\u4e2a\u503c\u5f97\u6df1\u6316\u7684\u7ec6\u8282\uff1a<\/p>\n\n\n
      \n
    1. \u80cc\u538b\uff08backpressure\uff09<\/strong>\uff1acli.C <- msg<\/code> \u662f\u65e0\u7f13\u51b2\u963b\u585e\u53d1\u9001\u3002\u5982\u679c\u67d0\u4e2a\u7528\u6237\u7684 ListenMessage<\/code> \u534f\u7a0b\u5199\u8fde\u63a5\u5f88\u6162\uff0c\u5206\u53d1\u534f\u7a0b\u5c31\u4f1a\u5361\u5728\u8fd9\u4e2a <-<\/code> \u4e0a\uff0c\u5bfc\u81f4\u6574\u4e2a\u5e7f\u64ad\u88ab\u6700\u6162\u7684\u4eba\u62d6\u4f4f<\/strong>\u3002\u8fd9\u662f\u65e0\u7f13\u51b2 channel \u5e26\u6765\u7684\u5929\u7136\u9650\u6d41\uff0c\u4e5f\u662f\u5b83\u5728\u751f\u4ea7\u73af\u5883\u91cc\u9700\u8981\u8c28\u614e\u5904\u7406\u7684\u5730\u65b9\uff08\u901a\u5e38\u8981\u914d\u5408\u6709\u7f13\u51b2 channel \u6216\u8d85\u65f6\uff09\u3002<\/li>\n
    2. \u53d1\u9001\u5199\u5728\u9501\u5185<\/strong>\uff1acli.C <- msg<\/code> \u662f\u5728\u6301\u6709 MapLock<\/code> \u7684\u60c5\u51b5\u4e0b\u6267\u884c\u7684\u3002\u5982\u679c\u67d0\u4e2a cli.C<\/code> \u4e00\u76f4\u6ca1\u4eba\u6536\uff0c\u5206\u53d1\u534f\u7a0b\u4f1a\u4e00\u76f4\u5360\u7740\u9501\uff0c\u5176\u4ed6\u60f3\u4e0a\u9501\u7684\u534f\u7a0b\u5168\u88ab\u6321\u4f4f\u3002\u6559\u5b66\u9879\u76ee\u91cc\u80fd\u8dd1\uff0c\u4f46\u5de5\u7a0b\u4e0a\u66f4\u7a33\u59a5\u7684\u505a\u6cd5\u662f\u300c\u5148\u53d6\u51fa\u5feb\u7167\u3001\u518d\u89e3\u9501\u3001\u518d\u9010\u4e2a\u6295\u9012\u300d\u3002<\/li>\n<\/ol>\n\n\n
      \u6bcf\u4e2a\u7528\u6237\u7684\u300c\u6536\u4fe1\u534f\u7a0b\u300d\u5219\u7b80\u5355\u5230\u6781\u81f4\uff1a<\/p>\n\n\n
      func (this *User) ListenMessage() {\n    for {\n        msg := <-this.C                 \/\/ \u963b\u585e\u7b49\u81ea\u5df1\u4e13\u5c5e\u901a\u9053\u7684\u6d88\u606f\n        this.conn.Write([]byte(msg + \"\\n\"))\n    }\n}<\/code><\/pre>\n\n\n
      \u5b83\u7684\u751f\u547d\u5468\u671f\u548c\u8fde\u63a5\u7ed1\u5b9a\uff1a\u8fde\u63a5\u65ad\u5f00\uff0c\u534f\u7a0b\u7ed3\u675f\u3002\u8fd9\u5c31\u662f\u300c\u4e00\u4e2a goroutine \u53ea\u505a\u4e00\u4ef6\u4e8b\uff0c\u9760 channel \u4e32\u8d77\u6765\u300d\u7684\u7ecf\u5178\u8303\u5f0f\u3002<\/p>\n\n\n
      \u4e94\u3001\u6838\u5fc3\u6a21\u5f0f\u4e8c\uff1aselect + time.After \u5b9e\u73b0\u8d85\u65f6<\/h2>\n\n\n
      \u804a\u5929\u5ba4\u9700\u8981\u300c\u591a\u4e45\u6ca1\u8bf4\u8bdd\u5c31\u628a\u4eba\u8e22\u4e86\u300d\u3002Handler<\/code> \u7528 select<\/code> \u628a\u300c\u6709\u6d3b\u52a8\u300d\u548c\u300c\u8d85\u65f6\u300d\u4e24\u4ef6\u4e8b\u4f18\u96c5\u5730\u5408\u5e76\u5230\u4e86\u4e00\u8d77\uff1a<\/p>\n\n\n
      func (this *Server) Handler(conn net.Conn) {\n    user := NewUser(conn, this)\n    user.OnLine()\n\n    IsLive := make(chan bool)   \/\/ \u5fc3\u8df3\u901a\u9053\n    go func() {\n        buf := make([]byte, 1024)\n        for {\n            n, err := conn.Read(buf)\n            if n == 0 {\n                user.OffLine()\n                return\n            }\n            \/\/ ...\n            user.DoMessage(string(buf[:n-2]))\n            IsLive <- true       \/\/ \u6bcf\u6b21\u6536\u5230\u6d88\u606f\u90fd\u300c\u62a5\u4e00\u58f0\u5e73\u5b89\u300d\n        }\n    }()\n\n    for {\n        select {\n        case <-IsLive:                      \/\/ \u6709\u6d3b\u52a8\uff1a\u91cd\u7f6e\u8ba1\u65f6\n        case <-time.After(time.Second * 20): \/\/ 20 \u79d2\u6ca1\u52a8\u9759\uff1a\u8e22\u4eba\n            user.SendMessage(\"\u4f60\u88ab\u8e22\u4e86\")\n            user.OffLine()\n            close(user.C)\n            conn.Close()\n            return\n        }\n    }\n}<\/code><\/pre>\n\n\n
      \u8fd9\u6bb5\u4ee3\u7801\u5c55\u793a\u4e86 select<\/code> \u7684\u4e24\u4e2a\u8981\u70b9\uff1a<\/p>\n\n\n
        \n
      • \u591a\u8def\u590d\u7528<\/strong>\uff1aselect<\/code> \u4f1a\u963b\u585e\uff0c\u76f4\u5230\u4efb\u610f\u4e00\u4e2a case \u7684 channel \u53ef\u7528\uff1b\u591a\u4e2a\u540c\u65f6\u53ef\u7528\u65f6\u968f\u673a\u9009\u4e00\u4e2a\u3002\u8fd9\u91cc\u628a\u300c\u6765\u6d88\u606f\u300d\u548c\u300c\u8d85\u65f6\u300d\u5f53\u6210\u4e24\u4e2a\u5e73\u7b49\u7684\u4e8b\u4ef6\u6765\u5904\u7406\u3002<\/li>\n
      • time.After<\/code> \u8fd4\u56de\u4e00\u4e2a channel<\/strong>\uff1a\u5b83\u4f1a\u5728\u6307\u5b9a\u65f6\u95f4\u540e\u5f80 channel \u91cc\u585e\u4e00\u4e2a\u503c\uff0c\u4e8e\u662f\u300c\u5b9a\u65f6\u5668\u300d\u4e5f\u88ab\u7edf\u4e00\u62bd\u8c61\u6210\u4e86 channel\uff0c\u6b63\u597d\u80fd\u88ab select<\/code> \u6d88\u8d39\u3002<\/li>\n<\/ul>\n\n\n
        \u4e00\u4e2a\u5c0f\u63d0\u9192\uff1atime.After<\/code> \u6bcf\u6b21\u8c03\u7528\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 time.Timer<\/code>\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u628a\u5b83\u653e\u5728\u5faa\u73af\u91cc\uff0c\u6bcf\u6536\u5230\u4e00\u6b21\u5fc3\u8df3\u90fd\u4f1a\u65b0\u5efa\u4e00\u4e2a\u8ba1\u65f6\u5668\uff08\u65e7\u7684\u7b49 GC \u56de\u6536\uff09\u3002\u529f\u80fd\u6b63\u786e\uff0c\u4f46\u5982\u679c\u8ffd\u6c42\u4e25\u8c28\uff0c\u5e94\u8be5\u7528 time.NewTimer<\/code> + Reset<\/code> \u590d\u7528\u540c\u4e00\u4e2a\u8ba1\u65f6\u5668\u3002<\/p>\n\n\n
        \u516d\u3001Channel \u4e0e Mutex \u5982\u4f55\u5206\u5de5<\/h2>\n\n\n
        \u521d\u5b66\u8005\u6700\u5e38\u95ee\uff1a\u6709\u4e86 channel \u8fd8\u8981 mutex \u5e72\u561b\uff1f\u8fd9\u4e2a\u9879\u76ee\u7ed9\u51fa\u4e86\u4e00\u4e2a\u5f88\u597d\u7684\u5bf9\u7167\uff1a<\/p>\n\n\n
        \n\n\n\n
        \u573a\u666f<\/th>\n\u7528\u4ec0\u4e48<\/th>\n\u4e3a\u4ec0\u4e48<\/th>\n<\/tr><\/thead>
        \u6d88\u606f\u4f20\u9012\uff08\u5e7f\u64ad\u3001\u79c1\u804a\uff09<\/td>\nchannel<\/strong><\/td>\n\u4f20\u9012\u6570\u636e\u6240\u6709\u6743\uff0c\u5929\u7136\u540c\u6b65<\/td>\n<\/tr>\n
        \u5171\u4eab\u72b6\u6001\uff08\u5728\u7ebf\u7528\u6237\u8868 OnlineMap\uff09<\/td>\nsync.RWMutex<\/strong><\/td>\n\u591a\u8bfb\u591a\u5199\u4e00\u5f20 map\uff0c\u7528\u9501\u6700\u7b80\u5355\u76f4\u63a5<\/td>\n<\/tr>\n<\/tbody><\/table><\/figure>\n\n\n
        \u770b\u7528\u6237\u4e0a\u7ebf\/\u4e0b\u7ebf\u5982\u4f55\u64cd\u4f5c\u5171\u4eab\u7684 map\uff1a<\/p>\n\n\n
        func (this *User) OnLine() {\n    this.server.MapLock.Lock()\n    this.server.OnlineMap[this.Name] = this\n    this.server.MapLock.Unlock()\n    this.server.Boardcast(this, \"\u4e0a\u7ebf\")\n}\n\nfunc (this *User) OffLine() {\n    this.server.MapLock.Lock()\n    delete(this.server.OnlineMap, this.Name)\n    this.server.MapLock.Unlock()\n    this.server.Boardcast(this, \"\u4e0b\u7ebf\")\n}<\/code><\/pre>\n\n\n
        map<\/code> \u4e0d\u662f\u5e76\u53d1\u5b89\u5168\u7684\uff0c\u591a\u4e2a goroutine \u540c\u65f6\u8bfb\u5199\u4f1a panic\uff08concurrent map writes<\/code>\uff09\uff0c\u6240\u4ee5\u8fd9\u91cc\u7528 RWMutex<\/code> \u4fdd\u62a4\u3002\u7ecf\u9a8c\u6cd5\u5219\uff1a\u4f20\u9012\u6570\u636e\u7528 channel\uff0c\u4fdd\u62a4\u5171\u4eab\u72b6\u6001\u7528\u9501<\/strong>\u3002\u4e24\u8005\u4e0d\u662f\u5bf9\u7acb\u7684\uff0c\u6070\u6070\u7ecf\u5e38\u50cf\u8fd9\u6837\u914d\u5408\u4f7f\u7528\u3002<\/p>\n\n\n
        \u4e03\u3001\u5e38\u89c1\u9677\u9631\uff08\u7167\u7740\u8fd9\u4e2a\u9879\u76ee\u5c31\u80fd\u8e29\u5230\uff09<\/h2>\n\n\n
          \n
        1. \u5411\u5df2\u5173\u95ed\u7684 channel \u53d1\u9001 \u2192 panic<\/strong>\u3002\u672c\u9879\u76ee\u91cc Handler<\/code> \u8d85\u65f6\u4f1a close(user.C)<\/code>\uff0c\u5982\u679c\u6b64\u65f6 ListenMessager<\/code> \u6070\u597d\u8fd8\u5728 cli.C <- msg<\/code>\uff0c\u5c31\u4f1a panic\u3002\u751f\u4ea7\u4ee3\u7801\u52a1\u5fc5\u7528\u300c\u8c01\u5199\u8c01\u5173\u300d\u6216 select + done<\/code> \u6765\u89c4\u907f\u3002<\/li>\n
        2. \u4ece\u5df2\u5173\u95ed\u7684 channel \u63a5\u6536 \u2192 \u62ff\u5230\u96f6\u503c\uff0c\u4e0d\u4f1a\u62a5\u9519<\/strong>\u3002\u8981\u7528\u53cc\u8fd4\u56de\u503c\u5224\u65ad\uff1amsg, ok := <-ch<\/code>\uff0cok == false<\/code> \u8bf4\u660e\u901a\u9053\u5df2\u5173\u95ed\u3002<\/li>\n
        3. \u65e0\u7f13\u51b2 channel \u7684\u6b7b\u9501<\/strong>\uff1ach := make(chan string); ch <- \"hi\"<\/code> \u5982\u679c\u540c\u4e00\u65f6\u523b\u6ca1\u6709\u63a5\u6536\u65b9\uff0c\u8fd9\u6761 goroutine \u6c38\u8fdc\u5361\u4f4f\uff0c\u7a0b\u5e8f\u68c0\u6d4b\u5230\u6240\u6709 goroutine \u90fd\u7761\u6b7b\u65f6\u4f1a\u76f4\u63a5 fatal\u3002<\/li>\n
        4. goroutine \u6cc4\u6f0f<\/strong>\uff1a\u5f00\u4e86\u534f\u7a0b\u5374\u6ca1\u6709\u4efb\u4f55\u8ba9\u5b83\u9000\u51fa\u7684\u673a\u5236\uff08\u6bd4\u5982\u5fd8\u4e86 close<\/code> \u6216 context<\/code>\uff09\uff0c\u534f\u7a0b\u4f1a\u4e00\u76f4\u6302\u7740\u5360\u7528\u5185\u5b58\u3002<\/li>\n
        5. \u6301\u9501\u963b\u585e<\/strong>\uff1a\u5982\u524d\u9762\u6240\u8bf4\uff0c\u5728 Lock<\/code> \u91cc\u505a channel<\/code> \u7684\u963b\u585e\u53d1\u9001\uff0c\u662f\u6700\u5bb9\u6613\u57cb\u4e0b\u6027\u80fd\u9690\u60a3\u7684\u5730\u65b9\u4e4b\u4e00\u3002<\/li>\n<\/ol>\n\n\n
          \u516b\u3001\u603b\u7ed3<\/h2>\n\n\n
          \u56de\u5934\u770b\u8fd9\u4e2a\u4e0d\u5230 400 \u884c\u7684\u804a\u5929\u5ba4\uff0c\u5b83\u51e0\u4e4e\u6d53\u7f29\u4e86 Go \u5e76\u53d1\u7f16\u7a0b\u7684\u6838\u5fc3\u59ff\u52bf\uff1a<\/p>\n\n\n
            \n
          • goroutine<\/strong>\uff1ago Handler(conn)<\/code> \u4e00\u4e2a\u8fde\u63a5\u4e00\u4e2a\u534f\u7a0b\uff0cgo ListenMessage()<\/code> \u4e00\u4e2a\u7528\u6237\u4e00\u4e2a\u6536\u4fe1\u534f\u7a0b\uff0c\u628a\u5e76\u53d1\u5199\u5f97\u50cf\u987a\u5e8f\u4ee3\u7801\u3002<\/li>\n
          • channel<\/strong>\uff1aServer.Message<\/code> \u505a\u4e2d\u592e\u5e7f\u64ad\u961f\u5217\uff0cUser.C<\/code> \u505a\u4e2a\u4eba\u6536\u4fe1\u901a\u9053\uff0c\u6570\u636e\u5728 channel \u95f4\u6d41\u52a8\uff0c\u6240\u6709\u6743\u5728\u4ea4\u63a5\u4e2d\u8f6c\u79fb\u3002<\/li>\n
          • fan-out<\/strong>\uff1aListenMessager<\/code> \u4ece\u4e00\u6761 Message<\/code> \u6247\u51fa\u5230 N \u4e2a User.C<\/code>\uff0c\u662f\u5e7f\u64ad\u7684\u6700\u7b80\u5b9e\u73b0\u3002<\/li>\n
          • select + time.After<\/strong>\uff1a\u628a\u8d85\u65f6\u4e5f\u53d8\u6210 channel \u4e8b\u4ef6\uff0c\u4e0e\u4e1a\u52a1\u4e8b\u4ef6\u5e73\u7b49\u5730\u591a\u8def\u590d\u7528\u3002<\/li>\n
          • channel \u4e0e mutex \u5206\u5de5<\/strong>\uff1a\u4f20\u9012\u6570\u636e\u7528 channel\uff0c\u4fdd\u62a4 map \u7528\u9501\u3002<\/li>\n<\/ul>\n\n\n
            \u7406\u89e3\u4e86\u8fd9\u5957\u300c\u534f\u7a0b + \u901a\u9053\u300d\u7684\u601d\u7ef4\u6a21\u578b\uff0c\u518d\u53bb\u8bfb Redis\u3001etcd\u3001K8s \u8fd9\u4e9b Go \u5927\u9879\u76ee\uff0c\u4f1a\u53d1\u73b0\u5b83\u4eec\u7684\u5185\u6838\u91cc\u5230\u5904\u90fd\u662f\u8fd9\u6837\u7684\u7ed3\u6784\u3002\u5efa\u8bae\u4f60\u628a\u8fd9\u4e2a\u9879\u76ee\u8dd1\u8d77\u6765\uff0c\u4eb2\u624b\u5728 ListenMessager<\/code> \u91cc\u52a0\u4e2a\u65e5\u5fd7\u6253\u5370\uff0c\u89c2\u5bdf\u4e00\u6761\u6d88\u606f\u4ece Boardcast<\/code> \u5230\u6bcf\u4e2a\u8fde\u63a5\u5199\u51fa\u7684\u5168\u8fc7\u7a0b\u2014\u2014\u90a3\u65f6\u4f60\u4f1a\u771f\u6b63\u300c\u770b\u89c1\u300d\u5e76\u53d1\u3002<\/p>\n\n\n
            \n\n\n
            \u9644\uff1a\u5b8c\u6574\u4ee3\u7801\u89c1\u4ed3\u5e93\u7684 server.go<\/code>\u3001user.go<\/code>\uff0c\u5ba2\u6237\u7aef\u5728 client\/client.go<\/code>\uff0c\u81ea\u52a8\u5316\u6d4b\u8bd5\u5728 testclient\/main.go<\/code>\u3002<\/em><\/p>\n\n","protected":false},"excerpt":{"rendered":"
            \u672c\u6587\u4ee5\u4e00\u4e2a\u5c0f\u578b TCP \u804a\u5929\u5ba4\u9879\u76ee\u4e3a\u4f8b\uff0c\u62c6\u89e3 Go \u5e76\u53d1\u7f16\u7a0b\u91cc\u6700\u91cd\u8981\u7684\u4e24\u4e2a\u6982\u5ff5\uff1agoroutine \u4e0e cha […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-170","post","type-post","status-publish","format-standard","hentry","category-learn"],"_links":{"self":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts\/170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=170"}],"version-history":[{"count":4,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts\/170\/revisions"}],"predecessor-version":[{"id":179,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/posts\/170\/revisions\/179"}],"wp:attachment":[{"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=170"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.plutoze.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}