{"id":44423,"date":"2023-03-01T15:18:20","date_gmt":"2023-09-21T18:15:05","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e9%98%85%e8%af%bb%e4%ba%86golang%e4%b8%adchannel%e7%9a%84%e5%ae%9e%e7%8e%b0%e3%80%82\/"},"modified":"2024-04-29T16:52:59","modified_gmt":"2024-04-29T08:52:59","slug":"%e6%88%91%e9%98%85%e8%af%bb%e4%ba%86golang%e4%b8%adchannel%e7%9a%84%e5%ae%9e%e7%8e%b0%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e9%98%85%e8%af%bb%e4%ba%86golang%e4%b8%adchannel%e7%9a%84%e5%ae%9e%e7%8e%b0%e3%80%82\/","title":{"rendered":"\u6211\u9605\u8bfb\u4e86golang\u4e2dchannel\u7684\u5b9e\u73b0"},"content":{"rendered":"

\u6700\u8fd1\uff0c\u4e3a\u4e86\u8fce\u63a5\u672a\u6765\u7684CPU 10000\u6838\u65f6\u4ee3\uff0c\u6211\u5728C++\u4e2d\u5b9e\u73b0\u4e86\u4e00\u79cd\u540d\u4e3a”channel”\u7684\u5e76\u53d1\u73a9\u5177\uff0c\u8fd9\u5728\u8fd1\u5e74\u6765\u975e\u5e38\u6d41\u884c\u3002\u540c\u65f6\uff0c\u6211\u4e5f\u53c2\u8003\u4e86Golang\u4e2d\u7684channel\u5b9e\u73b0\uff0c\u5e76\u5bf9\u6211\u81ea\u5df1\u7684\u5b9e\u73b0\u8fdb\u884c\u4e86\u89e3\u91ca\u3002<\/p>\n

\u300cChannel\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u5728\u529f\u80fd\u4e0a\uff0c\u5b83\u4e0e\u88ab\u79f0\u4e3a”blocking_queue”\u7684thread\u57fa\u672c\u76f8\u540c\u3002<\/p>\n

\u5177\u6709\u4ee5\u4e0b\u7279\u70b9\u7684\uff1a
\n– \u5728goroutine\u4e0a\u8fd0\u884c\uff08\u800c\u4e0d\u662f\u57fa\u4e8ethread+mutex\uff09\u3002
\n– \u4f7f\u7528\u6709\u9650\u7684\u961f\u5217\u3002
\n– \u961f\u5217\u7684\u5143\u7d20\u6570\u91cf\u5141\u8bb8\u4e3a0\u3002
\n– \u5177\u6709\u5173\u95ed\u529f\u80fd\u3002<\/p>\n

\u4ec0\u4e48\u662fgoroutine\uff1f<\/h2>\n

\u6211\u627e\u4e0d\u5230\u5bf9\u4e8egoroutine\u8fd9\u4e2a\u8bcd\u7684\u660e\u786e\u5b9a\u4e49\uff0c\u4f46\u6211\u8ba4\u4e3agoroutine\u8fd9\u4e2a\u8bcd\u5927\u81f4\u4e0a\u6709\u4ee5\u4e0b\u4e24\u79cd\u610f\u601d\u3002<\/p>\n

    Go\u8bed\u8a00\u7684\u8f7b\u91cf\u7ea7\u7ebf\u7a0b\u53ef\u4ee5\u5f88\u597d\u5730\u6267\u884c\u3001\u6682\u505c\u548c\u6062\u590d\u64cd\u4f5c\u3002\u5728Go\u8bed\u8a00\u8c03\u5ea6\u5668\u4e2d\uff0c\u7c7b\u4f3c\u4e8e\u5f02\u6b65\u4efb\u52a1\u7684”\u53ef\u6267\u884c\u4efb\u52a1”\u3002<\/ol>\n

    \u53e6\u5916\uff0cgoroutine\u5728\u6e90\u4ee3\u7801\u4e2d\u88ab\u7b80\u5199\u4e3ag\u3002<\/p>\n

    \u8bf7\u53c2\u8003<\/p>\n

    \u8bf7\u53c2\u7167<\/p>\n

    \u8bf7\u67e5\u9605<\/p>\n

    \u8bf7\u501f\u9274<\/p>\n

    \u8bf7\u53c2\u8003\u4ee5\u4e0a<\/p>\n

    https:\/\/golang.org\/doc\/faq#goroutines<\/p>\n

    goroutine\u306b\u3064\u3044\u3066<\/p>\n

    https:\/\/morsmachine.dk\/go-scheduler<\/p>\n

    golang\u306e\u30b9\u30b1\u30b8\u30e5\u30fc\u30e9\u306b\u3064\u3044\u3066<\/p>\n

    https:\/\/github.com\/golang\/go\/blob\/7307e86afda3c5c7f6158d2469c39606fd1dba65\/src\/runtime\/runtime2.go#L404<\/p>\n

    goroutine\u306e\u69cb\u9020\u4f53\u306b\u3064\u3044\u3066<\/p>\n

    \u9605\u8bfb<\/h2>\n

    \u6211\u5011\u5c07\u7acb\u5373\u67e5\u770b\u65e9\u901f\u5be6\u65bdchannel\u7684\u5167\u5bb9\u3002\u8acb\u81f3https:\/\/github.com\/golang\/go\/blob\/7307e86afda3c5c7f6158d2469c39606fd1dba65\/src\/runtime\/chan.go\u3002<\/p>\n

    “channel\u7684\u7ed3\u6784\u4f53\u5b9a\u4e49” (channel de jiegou ti dingyi)<\/h3>\n

    \u9605\u8bfb\u4e0b\u53bb\u5c31\u4f1a\u660e\u767d\uff0c\u5927\u81f4\u4e0a\u5177\u6709\u4ee5\u4e0b\u7ed3\u6784\u3002<\/p>\n

    struct<\/span> chan<\/span>{<\/span>\r\n  std<\/span>::<\/span>deque<\/span><<\/span>value_type<\/span>><\/span> value_queue<\/span>;<\/span> \/\/ \u672c\u5f53\u306fRingBuffer\u3060\u3051\u3069\u307e\u3041\u5927\u4f53\u540c\u3058\u3067\u3057\u3087<\/span>\r\n  std<\/span>::<\/span>list<\/span><<\/span>RecvSudog<\/span>><\/span> recv_queue<\/span>;<\/span>\r\n  std<\/span>::<\/span>list<\/span><<\/span>SendSudog<\/span>><\/span> send_queue<\/span>;<\/span>\r\n  bool<\/span> closed<\/span> =<\/span> false<\/span>;<\/span>\r\n  std<\/span>::<\/span>mutex<\/span> mutex<\/span>;<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
    channel\u4e3b\u8981\u7531\u4e09\u4e2a\u961f\u5217\u7ec4\u6210\u3002
    \nvalue_queue\u662f\u7528\u4e8e\u5b58\u50a8\u503c\u7684\u961f\u5217\u3002
    \nsend\/recv_queue\u662f\u7528\u4e8e\u4fdd\u5b58\u53d1\u9001\/\u63a5\u6536\u534f\u7a0b\u7684\u961f\u5217\u3002<\/p>\n
    \u521b\u9020\u51fa chan<\/h3>\n
    \u5728\u8fd9\u91cc\u8fdb\u884c\u4e86channel\u7684\u751f\u6210
    \n\u5f53\u961f\u5217\u5143\u7d20\u6216\u5143\u7d20\u7c7b\u578b\u7684\u5927\u5c0f\u4e3a0\u65f6\uff0c\u8fdb\u884c\u4e86\u4f18\u5316\u4ee5\u51cf\u5c0fvalue_queue\u7684\u5927\u5c0f\uff0c\u4f46\u9664\u6b64\u4e4b\u5916\u6ca1\u6709\u5176\u4ed6\u6709\u8da3\u7684\u5730\u65b9\uff0c\u53ef\u4ee5\u8df3\u8fc7\u9605\u8bfb<\/p>\n
    \u5b9e\u73b0\u90ae\u4ef6\u53d1\u9001\u5904\u7406\u3002<\/h3>\n
    \u9001\u4fe1\u5904\u7406\u7684\u884c\u4e3a\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
      \n
    1. \n
        \u5982\u679cchannel\u662f\u7a7a\u901a\u9053\u6216\u8005\u5df2\u5173\u95ed\u7684\u60c5\u51b5\u4e0b\uff0c\u4f1a\u65e0\u64cd\u4f5c\u6216\u8005\u4e2d\u65ad<\/ol>\n<\/li>\n<\/ol>\n
         <\/p>\n
          \n
        1. \n
            \u5f53recv_queue\u4e2d\u5b58\u5728\u7b49\u5f85\u63a5\u6536\u7684goroutine\u65f6\uff0c\u4f1a\u5411\u8be5goroutine\u53d1\u9001\u5143\u7d20<\/ol>\n<\/li>\n<\/ol>\n
             <\/p>\n
              \n
            1. \n
                \u5f53value_queue\u6709\u7a7a\u95f2\u4f4d\u7f6e\u65f6\uff0c\u4f1a\u5411value_queue\u4e2d\u63a8\u9001\u5143\u7d20<\/ol>\n<\/li>\n<\/ol>\n
                 <\/p>\n
                  \u5c06\u81ea\u8eab\u7684goroutine\u5165\u961fsend_queue\uff0c\u5e76\u4e2d\u65ad\u8be5goroutine<\/ol>\n
                  \u638c\u63e1\u4e86\u8fd9\u70b9\u540e\u518d\u9605\u8bfb\u6e90\u4ee3\u7801\uff0c\u4f1a\u53d8\u5f97\u66f4\u5bb9\u6613\u7406\u89e3\u3002
                  \n\u6211\u89c9\u5f97\u5df2\u7ecf\u7406\u89e3\u4e86\uff0c\u6240\u4ee5\u9a6c\u4e0a\u5f00\u59cb\u9605\u8bfb\u3002<\/p>\n
                  \u5728\u8fd9\u4e2a\u94fe\u63a5\u4e0a\uff1ahttps:\/\/github.com\/golang\/go\/blob\/7307e86afda3c5c7f6158d2469c39606fd1dba65\/src\/runtime\/chan.go#L158-L200<\/p>\n
                  \u901a\u8fc7\u4ec5\u4f7f\u7528\u539f\u5b50\u6307\u4ee4\uff0c\u800c\u65e0\u9700\u4f7f\u7528\u4e92\u65a5\u9501\uff08OS\u7684\u9501\uff09\uff0c\u5b9e\u73b0\u4e86\u5904\u7406\u548c\u4f18\u5316\u3002<\/p>\n
                  \u5982\u679crecv_queue\u4e2d\u6709\u5143\u7d20:https:\/\/github.com\/golang\/go\/blob\/7307e86afda3c5c7f6158d2469c39606fd1dba65\/src\/runtime\/chan.go#L293
                  \n\u4ecerecv_queue\u4e2d\u53d6\u51fa\u4e00\u4e2agoroutine\uff0c\u5c06\u503c\u4f20\u9012\u7ed9\u8be5goroutine\uff0c\u89e3\u9501\u901a\u9053\uff0c\u5e76\u4f7f\u53d6\u51fa\u7684goroutine\u53ef\u4ee5\u91cd\u65b0\u5f00\u59cb\uff08\u2252\u5728thread_pool\u4e2d\u53d1\u5e03\uff09<\/p>\n
                  \u503c\u5f97\u6ce8\u610f\u7684\u662f\u5728\u89e3\u9501\u4e4b\u540e\uff0c\u5b9e\u73b0\u4e86goroutine\u53ef\u4ee5\u91cd\u65b0\u542f\u52a8\u7684\u529f\u80fd\u3002\u8fd9\u662f\u7531\u4e8e\u201c\u5728\u66f4\u6539goroutine\u5806\u6808\u5927\u5c0f\u65f6\uff0c\u8bd5\u56fe\u83b7\u53d6\u901a\u9053\u9501\u800c\u5bfc\u81f4\u6b7b\u9501\u201d\u8fd9\u4e2a\u95ee\u9898\u5f15\u8d77\u7684\u3002\u8bf7\u67e5\u770b\u4ee5\u4e0b\u95ee\u9898\u7684\u8be6\u7ec6\u4fe1\u606f\uff1ahttps:\/\/github.com\/golang\/go\/issues\/12967<\/p>\n
                  \u5982\u679cvalue_queue\u6709\u7a7a\u4f4d\u7684\u8bdd\uff0c\u8bf7\u9605\u8bfb\u6bcf\u4e2a\u4eba\u5b9e\u73b0\u7684\u89e3\u51b3\u65b9\u6848\u3002\u5728\u8fd9\u91cc\u63d0\u4f9b\u7684\u89e3\u51b3\u65b9\u6848\u6ca1\u6709\u592a\u591a\u6709\u8da3\u7684\u89e3\u91ca\u3002<\/p>\n
                  \u5982\u679c\u8981\u5c06\u6d88\u606f\u653e\u5165\u7b49\u5f85\u53d1\u9001\u961f\u5217\uff0c\u53ef\u4ee5\u67e5\u770b\u4ee5\u4e0b\u94fe\u63a5\uff1ahttps:\/\/github.com\/golang\/go\/blob\/7307e86afda3c5c7f6158d2469c39606fd1dba65\/src\/runtime\/chan.go#L258<\/p>\n
                  gopark<\/span>(<\/span>chanparkcommit<\/span>,<\/span> unsafe<\/span>.<\/span>Pointer<\/span>(<\/span>&<\/span>c<\/span>.<\/span>lock<\/span>),<\/span> waitReasonChanSend<\/span>,<\/span> traceEvGoBlockSend<\/span>,<\/span> 2<\/span>)<\/span>\r\n<\/code><\/pre>\n
                  \u8fd9\u91cc\u901a\u8fc7gopark()\u51fd\u6570 (https:\/\/github.com\/golang\/go\/blob\/fd6ba1c8a23d8a3fffb6c475b21f78510152ef5c\/src\/runtime\/proc.go#L319) \u6765\u89e3\u91ca\u4e2d\u65ad\u548c\u89e3\u9501\u3002<\/p>\n
                  \u5f53\u8c03\u7528gopark\u65f6\uff0c
                  \n1. \u5f53\u524d\u7684\u534f\u7a0b\u4f1a\u88ab\u6682\u505c\u3002
                  \n2. \u5728\u534f\u7a0b\u4e4b\u5916\uff08\u8bf7\u53c2\u8003\u673a\u5668\uff1a\u534f\u7a0b\u662f\u4ec0\u4e48\uff1f\u7684\u7ae0\u8282\uff09\u6267\u884c\u9501\u7684\u91ca\u653e\u64cd\u4f5c\u3002<\/p>\n
                  \u53d8\u6210\u8fd9\u79cd\u5f62\u52bf\u3002<\/p>\n
                  \u4e3a\u4ec0\u4e48\u8981\u8fdb\u884c\u8fd9\u6837\u590d\u6742\u7684\u5904\u7406\uff0c\u5373\u5728\u673a\u5668\u7684\u5916\u90e8\uff08oroutine\uff09\u8fdb\u884c\u9501\u7684\u91ca\u653e\u64cd\u4f5c\uff1f\u539f\u56e0\u662f\uff0c\u5982\u679c\u5148\u91ca\u653e\u901a\u9053\u7684\u9501\uff0c\u90a3\u4e48\u5728\u5176\u4ed6\u5904\u7406\u4f7f\u7528\u901a\u9053\u524d\uff0c\u5b58\u5728goroutine\u5728\u4e2d\u65ad\u4e4b\u524d\u88ab\u91cd\u65b0\u542f\u52a8\u7684\u53ef\u80fd\u6027\u3002<\/p>\n
                  \u4e3a\u4e86\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5\u53d1\u751f\uff0c\u6211\u4eec\u53ea\u9700\u5728goroutine\u4e2d\u6dfb\u52a0\u4e92\u65a5\u9501\u6765\u786e\u4fdd\u5b83\u4eec\u4e0d\u4f1a\u540c\u65f6\u6267\u884c\u3002\u4f46\u662f\u8fd9\u6837\u505a\u4f1a\u589e\u52a0\u989d\u5916\u7684\u4e92\u65a5\u9501\u6210\u672c\u3002
                  \n\u76ee\u524d\u7684\u5b9e\u73b0\u4f3c\u4e4e\u662f\u4e3a\u4e86\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u53d1\u751f\u3002<\/p>\n
                  \u5b9e\u73b0\u4fe1\u53f7\u5904\u7406\u548c\u5173\u95ed\u529f\u80fd<\/h3>\n
                  \u7531\u4e8e\u4fe1\u4ef6\u5904\u7406\u4e0e\u4ee5\u524d\u5927\u81f4\u76f8\u540c\uff0c\u8bf7\u5404\u4f4d\u81ea\u884c\u9605\u8bfb\u3002<\/p>\n
                  \u9009\u62e9\u529f\u80fd\u7684\u5b9e\u73b0<\/h3>\n
                  \u9009\u62e9\uff08\u4e0d\u77e5\u4e3a\u4f55\uff09\u88ab\u5206\u5272\u4e3a\u4e0d\u540c\u7684\u6587\u4ef6\u3002<\/p>\n
                  \u9009\u62e9\u884c\u4e3a\u5982\u4e0b\uff1a
                  \n1. \u5982\u679c\u5b58\u5728\u53ef\u4ee5\u7acb\u5373\u6267\u884c\u7684\u64cd\u4f5c\uff08\u5305\u62ec\u7a7a\u901a\u9053\u548c\u9ed8\u8ba4\u64cd\u4f5c\uff09\uff0c\u5219\u6267\u884c\u8be5\u64cd\u4f5c\u3002
                  \n2. \u5bf9\u4e8e\u6240\u6709\u4f5c\u4e3aselect\u76ee\u6807\u7684\u901a\u9053\uff0c\u5c06\u5e0c\u671b\u6267\u884c\u7684\u64cd\u4f5c\u5165\u961f\u5230\u53d1\u9001\u961f\u5217\u6216\u63a5\u6536\u961f\u5217\uff0c\u5e76\u6682\u505c\u6267\u884c\u3002
                  \n3. \u5f53\u4efb\u610f\u4e00\u4e2a\u901a\u9053\u88ab\u6267\u884c\u65f6\uff0c\u534f\u7a0b\u5c06\u88ab\u6062\u590d\u3002
                  \n4. \u53d6\u6d88\u672a\u6267\u884c\u7684\u5165\u961f\u64cd\u4f5c\u3002<\/p>\n
                  \u8bb0\u4f4f\u8fd9\u4e2a\uff0c\u7136\u540e\u518d\u8bfb\u6e90\u4ee3\u7801\u4f1a\u53d8\u5f97\u66f4\u5bb9\u6613\u3002\u6211\u60f3\u6211\u5df2\u7ecf\u8bb0\u4f4f\u4e86\uff0c\u6240\u4ee5\u6211\u7acb\u5373\u5f00\u59cb\u9605\u8bfb\u3002<\/p>\n
                  \u4ee5\u4e0b\u662f\u5bf9\u4e8epollorder\u7684\u51b3\u7b56\u4ee5\u53ca\u6bcf\u4e2achannel\u7684\u9501\u5b9a\u83b7\u53d6\u8fc7\u7a0b\u7684\u5730\u5740\uff1ahttps:\/\/github.com\/golang\/go\/blob\/c06a354bccf60ea32ed74238be409a00aac292c5\/src\/runtime\/select.go#L121-L230<\/p>\n
                  pollorder\u662f\u4e00\u4e2a\u51b3\u5b9a\u641c\u7d22\u987a\u5e8f\u7684\u5217\u8868\uff0c\u201c\u5982\u679c\u6709\u53ef\u7acb\u5373\u6267\u884c\u7684\u64cd\u4f5c\uff0c\u5219\u6267\u884c\u8be5\u64cd\u4f5c\u201d\u3002\u4ece\u5b9e\u73b0\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u8fd9\u4e2a\u987a\u5e8f\u662f\u968f\u673a\u7684\u3002\u8fd9\u662f\u6a21\u62df\u5f02\u6b65\u5904\u7406\u3002<\/p>\n
                  \u4e3a\u4e86\u83b7\u5f97lock\uff0c\u6211\u4eec\u6309\u7167channel\u7ed3\u6784\u4f53\u7684\u5185\u5b58\u5730\u5740\u987a\u5e8f\u6765\u83b7\u53d6lock\u3002\u8fd9\u662f\u56e0\u4e3a\u5982\u679c\u5b58\u5728\u591a\u4e2achannel\u7684lock\u9700\u8981\u83b7\u53d6\u7684\u60c5\u51b5\uff0c\u5982\u679c\u4e0d\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u83b7\u53d6lock\uff0c\u5c31\u53ef\u80fd\u5bfc\u81f4\u6b7b\u9501\u3002<\/p>\n
                  \u5bfb\u627e\u53ef\u6267\u884c\u9879\uff1ahttps:\/\/github.com\/golang\/go\/blob\/c06a354bccf60ea32ed74238be409a00aac292c5\/src\/runtime\/select.go#L243<\/p>\n
                  \/\/ pass 1 - look for something already waiting\r\n<\/code><\/pre>\n
                  \u6839\u636e\u8bc4\u8bba\u4e2d\u7684\u5efa\u8bae\uff0c\u627e\u5230\u53ef\u884c\u7684\u64cd\u4f5c\u5e76\u7acb\u5373\u6267\u884c\u3002<\/p>\n
                  \u5c06\u6240\u6709channel\u5165\u961f\uff1ahttps:\/\/github.com\/golang\/go\/blob\/c06a354bccf60ea32ed74238be409a00aac292c5\/src\/runtime\/select.go#L288-L327<\/p>\n
                  \/\/ pass 2 - enqueue on all chans\r\n<\/code><\/pre>\n
                  \u5c06\u6240\u6709\u7684\u9891\u9053\u6dfb\u52a0\u5230\u961f\u5217\u4e2d\u5e76\u6682\u505c\u3002<\/p>\n
                  \u5b9e\u884c\u548c\u6062\u590d\uff1ahttps:\/\/github.com\/golang\/go\/blob\/c06a354bccf60ea32ed74238be409a00aac292c5\/src\/runtime\/select.go#L327
                  \n\u5f53\u4efb\u4e00\u4fe1\u9053\u6062\u590d\u65f6\uff0c\u5c06\u6267\u884cpass3\u3002
                  \nhttps:\/\/github.com\/golang\/go\/blob\/7307e86afda3c5c7f6158d2469c39606fd1dba65\/src\/runtime\/chan.go#L819
                  \n\u4f5c\u4e3a\u6267\u884c\u65f6\u7684\u5904\u7406\uff0c\u901a\u8fc7\u5bf9dequeue\u65f6\u7684g.selectDone\u6267\u884cCAS\u64cd\u4f5c\uff0c\u9632\u6b62\u591a\u4e2a\u4fe1\u9053\u6267\u884cselect\u5904\u7406\u3002<\/p>\n
                  \u5728\u9009\u62e9\u64cd\u4f5c\u4e4b\u540e\u7684\u5904\u7406\u6b65\u9aa4\uff1ahttps:\/\/github.com\/golang\/go\/blob\/c06a354bccf60ea32ed74238be409a00aac292c5\/src\/runtime\/select.go#L336<\/p>\n
                  \/\/ pass 3 - dequeue from unsuccessful chans\r\n\/\/ otherwise they stack up on quiet channels\r\n\/\/ record the successful case, if any.\r\n\/\/ We singly-linked up the SudoGs in lock order.\r\n<\/code><\/pre>\n
                  \u5728pass3\u4e2d\uff0c\u5220\u9664\u672a\u4f7f\u7528\u7684\u5728pass2\u4e2d\u5165\u961f\u7684\u9879\u76ee\u3002<\/p>\n
                  \u6700\u540e<\/h2>\n
                  Go\u8bed\u8a00\u4e2d\u7684\u901a\u9053\uff08channel\uff09\u5728\u4ed4\u7ec6\u89c2\u5bdf\u65f6\u4f1a\u8fdb\u884c\u76f8\u5f53\u590d\u6742\u7684\u5904\u7406\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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