{"id":10006937,"date":"2022-11-29T16:18:23","date_gmt":"2022-11-29T08:18:23","guid":{"rendered":"https:\/\/ityet.com\/?p=10006937"},"modified":"2022-11-29T16:18:23","modified_gmt":"2022-11-29T08:18:23","slug":"%e4%bb%8e%e9%b9%85%e5%8e%82%e5%ae%9e%e4%be%8b%e5%87%ba%e5%8f%91%ef%bc%81%e5%88%86%e6%9e%90go-channel%e5%ba%95%e5%b1%82%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006937","title":{"rendered":"\u4ece\u9e45\u5382\u5b9e\u4f8b\u51fa\u53d1\uff01\u5206\u6790Go Channel\u5e95\u5c42\u539f\u7406"},"content":{"rendered":"<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927701\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u672c\u6587\u662f\u57fa\u4e8eGo1.18.1\u6e90\u7801\u7684\u5b66\u4e60\u7b14\u8bb0\u3002Channel\u7684\u5e95\u5c42\u6e90\u7801\u4eceGo1.14\u5230\u73b0\u5728\u7684Go1.19\u4e4b\u95f4\u51e0\u4e4e\u6ca1\u6709\u53d8\u5316\uff0c\u8fd9\u4e5f\u662fGo\u6700\u65e9\u5f15\u5165\u7684\u7ec4\u4ef6\u4e4b\u4e00\uff0c\u4f53\u73b0\u4e86Go\u5e76\u53d1\u601d\u60f3\uff1a<\/p>\n<pre><code>Do not communicate by sharing memory; instead, share memory by communicating.<\/code><\/pre>\n<p>\u4e0d\u8981\u901a\u8fc7\u5171\u4eab\u5185\u5b58\u6765\u901a\u4fe1\uff0c\u2f7d\u5e94\u901a\u8fc7\u901a\u4fe1\u6765\u5171\u4eab\u5185\u5b58\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927702\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u8fd8\u662f\u5148\u7ed9\u51fa\u7ed3\u8bba\uff0c\u6ca1\u65f6\u95f4\u770b\u5206\u6790\u8fc7\u7a0b\u7684\u540c\u5b66\u81f3\u5c11\u53ef\u4ee5\u770b\u4e00\u773c\u7ed3\u8bba\uff1a<\/p>\n<p>1. Channel\u672c\u8d28\u4e0a\u662f\u7531\u4e09\u4e2aFIFO\uff08First In FirstOut\uff0c\u5148\u8fdb\u5148\u51fa\uff09\u961f\u5217\u7ec4\u6210\u7684\u7528\u4e8e\u534f\u7a0b\u4e4b\u95f4\u4f20\u8f93\u6570\u636e\u7684\u534f\u7a0b\u5b89\u5168\u7684\u901a\u9053\uff1bFIFO\u7684\u8bbe\u8ba1\u662f\u4e3a\u4e86\u4fdd\u969c\u516c\u5e73\uff0c\u8ba9\u4e8b\u60c5\u53d8\u5f97\u7b80\u5355\uff0c\u539f\u5219\u662f\u8ba9\u7b49\u5f85\u65f6\u95f4\u6700\u957f\u7684\u534f\u7a0b\u6700\u6709\u8d44\u683c\u5148\u4ecechannel\u53d1\u9001\u6216\u63a5\u6536\u6570\u636e\uff1b<\/p>\n<p>2. \u4e09\u4e2aFIFO\u961f\u5217\u4f9d\u6b21\u662fbuf\u5faa\u73af\u961f\u5217\uff0csendq\u5f85\u53d1\u9001\u8005\u961f\u5217\uff0crecvq\u5f85\u63a5\u6536\u8005\u961f\u5217\u3002buf\u5faa\u73af\u961f\u5217\u662f\u5927\u5c0f\u56fa\u5b9a\u7684\u7528\u6765\u5b58\u653echannel\u63a5\u6536\u7684\u6570\u636e\u7684\u961f\u5217\uff1bsendq\u5f85\u53d1\u9001\u8005\u961f\u5217\uff0c\u7528\u6765\u5b58\u653e\u7b49\u5f85\u53d1\u9001\u6570\u636e\u5230channel\u7684goroutine\u7684\u53cc\u5411\u94fe\u8868\uff0crecvq\u5f85\u63a5\u6536\u8005\u961f\u5217\uff0c\u7528\u6765\u5b58\u653e\u7b49\u5f85\u4ecechannel\u8bfb\u53d6\u6570\u636e\u7684goroutine\u7684\u53cc\u5411\u94fe\u8868\uff1bsendq\u548crecvq\u53ef\u4ee5\u8ba4\u4e3a\u4e0d\u9650\u5927\u5c0f\uff1b<\/p>\n<p>3. \u8ddf\u51fd\u6570\u8c03\u7528\u4f20\u53c2\u672c\u8d28\u90fd\u662f\u4f20\u503c\u4e00\u6837\uff0cchannel\u4f20\u9012\u6570\u636e\u7684\u672c\u8d28\u5c31\u662f\u503c\u62f7\u8d1d\uff0c\u5f15\u7528\u7c7b\u578b\u6570\u636e\u7684\u4f20\u9012\u4e5f\u662f\u5730\u5740\u62f7\u8d1d\uff1b\u6709\u4ece\u7f13\u51b2\u533abuf\u5730\u5740\u62f7\u8d1d\u6570\u636e\u5230\u63a5\u6536\u8005receiver\u6808\u5185\u5b58\u5730\u5740\uff0c\u4e5f\u6709\u4ece\u53d1\u9001\u8005sender\u6808\u5185\u5b58\u5730\u5740\u62f7\u8d1d\u6570\u636e\u5230\u7f13\u51b2\u533abuf\uff1b<\/p>\n<p>4. Channel\u91cc\u9762\u53c2\u6570\u7684\u4fee\u6539\u4e0d\u662f\u5e76\u53d1\u5b89\u5168\u7684\uff0c\u5305\u62ec\u5bf9\u4e09\u4e2a\u961f\u5217\u53ca\u5176\u4ed6\u53c2\u6570\u7684\u8bbf\u95ee\uff0c\u56e0\u6b64\u9700\u8981\u52a0\u9501\uff0c\u672c\u8d28\u4e0a\uff0cchannel\u5c31\u662f\u4e00\u4e2a\u6709\u9501\u961f\u5217\uff1b<\/p>\n<p>5. Channel \u7684\u6027\u80fd\u8ddf sync.Mutex \u5dee\u4e0d\u591a\uff0c\u6ca1\u6709\u8c01\u6bd4\u8c01\u5f3a\u3002Go\u5b98\u65b9\u4e4b\u6240\u4ee5\u63a8\u8350\u4f7f\u7528Channel\u8fdb\u884c\u5e76\u53d1\u534f\u7a0b\u7684\u6570\u636e\u4ea4\u4e92\uff0c\u662f\u56e0\u4e3achannel\u7684\u8bbe\u8ba1\u7406\u5ff5\u80fd\u8ba9\u7a0b\u5e8f\u53d8\u5f97\u7b80\u5355\uff0c\u5728\u5927\u578b\u7a0b\u5e8f\u3001\u9ad8\u5e76\u53d1\u590d\u6742\u7684\u8fd0\u884c\u72b6\u51b5\u4e2d\u4e5f\u662f\u5982\u6b64\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927703\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2><strong>\u4ece\u4e00\u4e2a\u7ebf\u4e0a\u7684\u5185\u5b58\u6cc4\u6f0f\u95ee\u9898\u8c08\u8d77<\/strong><\/h2>\n<p>\u53bb\u5e74\u5e95\uff0c\u56e2\u961f\u6709\u4e2a\u7ebf\u4e0a\u670d\u52a1\u53d1\u751f\u4e86\u4e00\u4e2a\u6545\u969c\uff0c\u8be5\u670d\u52a1\u90e8\u7f72\u5728K8S\u96c6\u7fa4\u7684\u5bb9\u5668\u91cc\uff0c\u901a\u8fc7Prometheus\u76d1\u63a7\u754c\u9762\u770b\u5230\u672c\u670d\u52a1\u7684Pod\u7684\u5185\u5b58\u4f7f\u7528\u91cf\u5448\u952f\u9f7f\u72b6\u589e\u957f\uff0c\u8fbe\u5230\u670d\u52a1\u8bbe\u7f6e\u7684\u5185\u5b58\u4e0a\u965016G\u540e\uff0c\u5c31\u4f1a\u53d1\u751f\u5bb9\u5668\u91cd\u542f\uff0c\u770b\u73b0\u8c61\u662f\u53d1\u751f\u4e86\u5185\u5b58\u6cc4\u6f0f\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927704\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>\u7ebf\u4e0a\u670d\u52a1\u7684\u4ee3\u7801\u7ecf\u8fc7\u7b80\u5316\uff0c\u57fa\u672c\u903b\u8f91\u5982\u4e0b\uff1a<\/p>\n<pre><code>package main\n\nimport (\n  &quot;errors&quot;\n  &quot;fmt&quot;\n)\n\nfunc accessMultiService() (data string, err error) {\n  respAChan := make(chan string)           \/\/\u65e0\u7f13\u51b2channel\n  go func() {\n    serviceAResp, _ := accessServiceA()\n    respAChan &lt;- serviceAResp\n  }()\n\n  _, serviceBErr := accessServiceB()\n  if serviceBErr != nil {\n    return &quot;&quot;, errors.New(&quot;service B response error&quot;)\n  }\n\n  _, serviceCErr := accessServiceC()\n  if serviceCErr != nil {\n    return &quot;&quot;, errors.New(&quot;service C response error&quot;)\n  }\n\n  respA := &lt;- respAChan\n  fmt.Printf(&quot;service A resp is: %s\/n&quot;, respA)\n  return  &quot;success&quot;, nil\n}\n\nfunc accessServiceA() (string, error) {\n  return &quot;service A result&quot;, nil\n}\n\nfunc accessServiceB() (string, error) {\n  return &quot;service B result&quot;, errors.New(&quot;service B error&quot;)\n}\n\nfunc accessServiceC() (string, error) {\n  return &quot;service C result&quot;, nil\n}<\/code><\/pre>\n<p>\u7ecf\u8fc7\u6392\u67e5\uff0c\u662f\u5728\u8d77\u7684\u4e00\u4e2agoroutine\u8bbf\u95ee A \u670d\u52a1\u65f6\uff0c\u4f7f\u7528\u4e86\u4e00\u4e2a\u65e0\u7f13\u51b2\u7684channel \u00a0respAChan\uff0c\u5728\u540e\u7eed\u7684\u8bbf\u95ee\u670d\u52a1B\uff0cC\u65f6\uff0c\u53d1\u751f\u4e86\u5f02\u5e38\u5bfc\u81f4\u7236\u534f\u7a0b\u8fd4\u56de\uff0cA\u670d\u52a1\u7684\u5b50\u534f\u7a0b\u91cc\u7684\u65e0\u7f13\u51b2channel respAChan\u4e00\u76f4\u6ca1\u6709goroutine\u53bb\u8bfb\u5b83\uff0c\u5bfc\u81f4\u5b83\u4e00\u76f4\u88ab\u963b\u585e\uff0c\u65e0\u6cd5\u88ab\u91ca\u653e\uff0c\u968f\u7740\u8bf7\u6c42\u6570\u7684\u589e\u591a\uff0c\u5b83\u6240\u5728\u7684goroutine\u4f1a\u4e00\u76f4\u5360\u7528\u5185\u5b58\uff0c\u76f4\u5230\u8fbe\u5230\u5bb9\u5668\u5185\u5b58\u4e0a\u9650\uff0c\u4f7f\u5bb9\u5668\u5d29\u6e83\u91cd\u542f\u3002<\/p>\n<p>\u89e3\u51b3\u529e\u6cd5\u53ef\u4ee5\u662f\uff1a\u5c06\u65e0\u7f13\u51b2\u7684channel\u6539\u6210\u6709\u7f13\u51b2channel\uff0c\u5e76\u4e14\u5728\u5199\u5165\u6570\u636e\u540e\u5173\u95ed\u5b83\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u53d1\u751fgoroutine\u4e00\u76f4\u963b\u585e\uff0c\u65e0\u6cd5\u88ab\u91ca\u653e\u7684\u95ee\u9898\u4e86\u3002<\/p>\n<pre><code>        respAChan := make(chan string, 1)           \/\/\u6539\u4e3a\u6709\u7f13\u51b2channel\n  go func() {\n    serviceAResp, _ := accessServiceA()\n    respAChan &lt;- serviceAResp\n    close(respAChan)                   \/\/\u5199\u5165\u540e\u5173\u95edchannel\n  }()<\/code><\/pre>\n<p>\u4ece\u8fd9\u4e2a\u95ee\u9898\u53ef\u4ee5\u77e5\u9053\u5c3d\u7ba1\u5927\u5bb6\u90fd\u7528\u8fc7channel\uff0c\u5374\u4e5f\u5bb9\u6613\u56e0\u4f7f\u7528\u4e0d\u5f53\u800c\u5bfc\u81f4\u7ebf\u4e0a\u6545\u969c\u3002<\/p>\n<p><strong>Channel\u662f\u4ec0\u4e48\uff1f\u600e\u4e48\u7528\uff1f<\/strong><\/p>\n<p>\u9996\u5148\u662fchannel\u5206\u4e3a\u4e24\u7c7b\uff1a<\/p>\n<p>1.\u65e0\u7f13\u51b2channel\uff0c\u53ef\u4ee5\u770b\u4f5c\u201c\u540c\u6b65\u6a21\u5f0f\u201d\uff0c\u53d1\u9001\u65b9\u548c\u63a5\u6536\u65b9\u8981\u540c\u6b65\u5c31\u7eea\uff0c\u53ea\u6709\u5728\u4e24\u8005\u90fd ready \u7684\u60c5\u51b5\u4e0b\uff0c\u6570\u636e\u624d\u80fd\u5728\u4e24\u8005\u95f4\u4f20\u8f93\uff08\u540e\u9762\u4f1a\u770b\u5230\uff0c\u5b9e\u9645\u4e0a\u5c31\u662f\u5185\u5b58\u62f7\u8d1d\uff09\u3002\u5426\u5219\uff0c\u4efb\u610f\u4e00\u65b9\u5148\u884c\u8fdb\u884c\u53d1\u9001\u6216\u63a5\u6536\u64cd\u4f5c\uff0c\u90fd\u4f1a\u88ab\u6302\u8d77\uff0c\u7b49\u5f85\u53e6\u4e00\u65b9\u7684\u51fa\u73b0\u624d\u80fd\u88ab\u5524\u9192\u3002<\/p>\n<p>2.\u6709\u7f13\u51b2channel\u79f0\u4e3a\u201c\u5f02\u6b65\u6a21\u5f0f\u201d\uff0c\u5728\u7f13\u51b2\u69fd\u53ef\u7528\u7684\u60c5\u51b5\u4e0b\uff08\u6709\u5269\u4f59\u5bb9\u91cf\uff09\uff0c\u53d1\u9001\u548c\u63a5\u6536\u64cd\u4f5c\u90fd\u53ef\u4ee5\u987a\u5229\u8fdb\u884c\u3002\u5426\u5219\uff0c\u64cd\u4f5c\u7684\u4e00\u65b9\uff08\u5982\u5199\u5165\uff09\u540c\u6837\u4f1a\u88ab\u6302\u8d77\uff0c\u76f4\u5230\u51fa\u73b0\u76f8\u53cd\u64cd\u4f5c \uff08\u5982\u63a5\u6536\uff09\u624d\u4f1a\u88ab\u5524\u9192\u3002<\/p>\n<p>channel\u7684\u57fa\u672c\u7528\u6cd5\u6709\uff1a<\/p>\n<p>1.\u8bfb\u53d6 &lt;- chan<\/p>\n<p>2.\u5199\u5165 chan &lt;-<\/p>\n<p>3.\u5173\u95ed close(chan)<\/p>\n<p>4.\u83b7\u53d6channel\u957f\u5ea6 len(chan)<\/p>\n<p>5.\u83b7\u53d6channel\u5bb9\u91cf cap(chan)<\/p>\n<p>\u8fd8\u6709\u4e00\u79cdselect\u975e\u963b\u585e\u8bbf\u95ee\u65b9\u5f0f\uff0c\u4ece\u6240\u6709\u7684case\u4e2d\u6311\u9009\u4e00\u4e2a\u4e0d\u4f1a\u963b\u585e\u7684channel\u8fdb\u884c\u8bfb\u5199\u64cd\u4f5c\uff0c\u6216\u662fdefault\u6267\u884c\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927705\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>Channel\u8bbe\u8ba1\u601d\u60f3<\/strong><\/p>\n<p>Go\u8bed\u8a00\u7684\u5e76\u53d1\u6a21\u578b\u662fCSP\uff08Communicating Sequential Processes\uff0c\u901a\u4fe1\u987a\u5e8f\u8fdb\u7a0b\uff09\uff0c\u63d0\u5021\u901a\u8fc7\u901a\u4fe1\u5171\u4eab\u5185\u5b58\u800c\u4e0d\u662f\u901a\u8fc7\u5171\u4eab\u5185\u5b58\u800c\u5b9e\u73b0\u901a\u4fe1\u3002<\/p>\n<p>\u5982\u679c\u8bf4goroutine\u662fGo\u7a0b\u5e8f\u5e76\u53d1\u7684\u6267\u884c\u4f53\uff0cchannel\u5c31\u662f\u5b83\u4eec\u4e4b\u95f4\u7684\u8fde\u63a5\u3002channel\u662f\u53ef\u4ee5\u8ba9\u4e00\u4e2agoroutine\u53d1\u9001\u7279\u5b9a\u503c\u5230\u53e6\u4e00\u4e2agoroutine\u7684\u901a\u4fe1\u673a\u5236\u3002<\/p>\n<p>\u4e0b\u9762\u6709\u5173\u5e76\u53d1\u8ba8\u8bba\u4e2d\u7684\u7ebf\u7a0b\u53ef\u4ee5\u66ff\u6362\u4e3a\u8fdb\u7a0b\u3001\u534f\u7a0b\u6216\u51fd\u6570\uff0c\u672c\u8d28\u4e0a\u90fd\u662f\u540c\u65f6\u5bf9\u540c\u4e00\u4efd\u6570\u636e\u7684\u7ade\u4e89\u3002<\/p>\n<p>\u5148\u5f04\u6e05\u695a\u5e76\u53d1\u548c\u5e76\u884c\u7684\u533a\u522b\uff1a\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u5728\u4e00\u4e2a\u6838\u7684CPU\u4e0a\u8fd0\u884c\uff0c\u5c31\u662f\u5e76\u53d1\u3002\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u5728\u591a\u4e2a\u6838\u7684CPU\u4e0a\u8fd0\u884c\uff0c\u5c31\u662f\u5e76\u884c\u3002<\/p>\n<p>\u5355\u7eaf\u5730\u5c06\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\u662f\u6ca1\u6709\u610f\u4e49\u7684\u3002\u7ebf\u7a0b\u4e0e\u7ebf\u7a0b\u95f4\u9700\u8981\u4ea4\u6362\u6570\u636e\u624d\u80fd\u4f53\u73b0\u5e76\u53d1\u6267\u884c\u7ebf\u7a0b\u7684\u610f\u4e49\u3002<\/p>\n<p>\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u4ea4\u6362\u6570\u636e\u65e0\u975e\u662f\u4e24\u79cd\u65b9\u5f0f\uff1a\u5171\u4eab\u5185\u5b58\u52a0\u4e92\u65a5\u9501\uff1b\u5148\u8fdb\u5148\u51fa(FIFO)\u5c06\u8d44\u6e90\u5206\u914d\u7ed9\u7b49\u5f85\u65f6\u95f4\u6700\u957f\u7684\u7ebf\u7a0b\u3002<\/p>\n<p>\u5171\u4eab\u5185\u5b58\u52a0\u4e92\u65a5\u9501\u662fC++\u7b49\u5176\u4ed6\u8bed\u8a00\u91c7\u7528\u7684\u5e76\u53d1\u7ebf\u7a0b\u4ea4\u6362\u6570\u636e\u7684\u65b9\u5f0f\uff0c\u5728\u9ad8\u5e76\u53d1\u7684\u573a\u666f\u4e0b\u6709\u65f6\u5019\u96be\u4ee5\u6b63\u786e\u7684\u4f7f\u7528\uff0c\u7279\u522b\u662f\u5728\u8d85\u5927\u578b\u3001\u5de8\u578b\u7684\u7a0b\u5e8f\u4e2d\uff0c\u5bb9\u6613\u5e26\u6765\u96be\u4ee5\u5bdf\u89c9\u7684\u9690\u85cf\u7684\u95ee\u9898\u3002Go\u8bed\u8a00\u91c7\u7528\u7684\u662f\u540e\u8005\uff0c\u5f15\u5165channel\u4ee5\u5148\u8fdb\u5148\u51fa(FIFO)\u5c06\u8d44\u6e90\u5206\u914d\u7ed9\u7b49\u5f85\u65f6\u95f4\u6700\u957f\u7684goroutine\uff0c\u5c3d\u91cf\u6d88\u9664\u6570\u636e\u7ade\u4e89\uff0c\u8ba9\u7a0b\u5e8f\u4ee5\u5c3d\u53ef\u80fd\u987a\u5e8f\u4e00\u81f4\u7684\u65b9\u5f0f\u8fd0\u884c\u3002<\/p>\n<p>\u5173\u4e8e\u7406\u89e3\u8ba9\u7a0b\u5e8f\u5c3d\u91cf\u987a\u5e8f\u4e00\u81f4\u7684\u542b\u4e49\uff0c\u53ef\u4ee5\u770b\u770bGo\u8bed\u8a00\u5185\u5b58\u6a21\u578b\u91c7\u7528\u7684\u4e00\u4e2a\u4f20\u7edf\u7684\u57fa\u4e8ehappens-before\u5bf9\u8bfb\u5199\u7ade\u4e89\u7684\u5b9a\u4e49\uff1a<\/p>\n<p>1.\u4fee\u6539\u7531\u591a\u4e2agoroutines\u540c\u65f6\u8bbf\u95ee\u7684\u6570\u636e\u7684\u7a0b\u5e8f\u5fc5\u987b\u4e32\u884c\u5316\u8fd9\u4e9b\u8bbf\u95ee\u3002<\/p>\n<p>2.\u4e3a\u4e86\u5b9e\u73b0\u4e32\u884c\u8bbf\u95ee, \u9700\u8981\u4f7f\u7528channel\u64cd\u4f5c\u6216\u5176\u4ed6\u540c\u6b65\u539f\u8bed(\u5982sync\u548csync\/atomic\u5305\u4e2d\u7684\u539f\u8bed)\u6765\u4fdd\u62a4\u6570\u636e\u3002<\/p>\n<p>3.go\u8bed\u53e5\u521b\u5efa\u4e00\u4e2agoroutine\uff0c\u4e00\u5b9a\u53d1\u751f\u5728goroutine\u6267\u884c\u4e4b\u524d\u3002<\/p>\n<p>4.\u5f80\u4e00\u4e2achannel\u4e2d\u53d1\u9001\u6570\u636e\uff0c\u4e00\u5b9a\u53d1\u751f\u5728\u4ece\u8fd9\u4e2achannel \u8bfb\u53d6\u8fd9\u4e2a\u6570\u636e\u5b8c\u6210\u4e4b\u524d\u3002<\/p>\n<p>5.\u4e00\u4e2achannel\u7684\u5173\u95ed\uff0c\u4e00\u5b9a\u53d1\u751f\u5728\u4ece\u8fd9\u4e2achannel\u8bfb\u53d6\u5230\u96f6\u503c\u6570\u636e\uff08\u8fd9\u91cc\u6307\u56e0\u4e3aclose\u800c\u8fd4\u56de\u7684\u96f6\u503c\u6570\u636e\uff09\u4e4b\u524d\u3002<\/p>\n<p>6.\u4ece\u4e00\u4e2a\u65e0\u7f13\u51b2channel\u7684\u8bfb\u53d6\u6570\u636e\uff0c\u4e00\u5b9a\u53d1\u751f\u5728\u5f80\u8fd9\u4e2achannel\u53d1\u9001\u6570\u636e\u5b8c\u6210\u4e4b\u524d\u3002<\/p>\n<p>\u5982\u679c\u8fdd\u53cd\u4e86\u8fd9\u79cd\u5b9a\u4e49\uff0cGo\u4f1a\u8ba9\u7a0b\u5e8f\u76f4\u63a5panic\u6216\u963b\u585e\uff0c\u65e0\u6cd5\u5f80\u540e\u6267\u884c\u3002<\/p>\n<p>\u6709\u4eba\u8bf4\uff0cGo\u6ca1\u6709\u91c7\u7528\u5171\u4eab\u5185\u5b58\u52a0\u4e92\u65a5\u9501\u8fdb\u884c\u534f\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u662f\u56e0\u4e3a\u8fd9\u79cd\u65b9\u5f0f\u6027\u80fd\u592a\u5dee\uff0c\u5176\u5b9e\u4e0d\u662f\uff0c\u56e0\u4e3achannel\u672c\u8d28\u4e5f\u662f\u4e00\u4e2a\u6709\u9501\u7684\u961f\u5217\uff0c\u91c7\u7528channel\u8fdb\u884c\u534f\u7a0b\u4e4b\u95f4\u7684\u901a\u4fe1\uff0c\u4e3b\u8981\u662f\u4e3a\u4e86\u51cf\u5c11\u6570\u636e\u7ade\u4e89\uff0c\u5728\u5927\u578b\u7a0b\u5e8f\u3001\u9ad8\u5e76\u53d1\u7684\u590d\u6742\u573a\u666f\u4e0b\uff0c\u4ee5\u7b80\u5355\u7684\u539f\u7406\u5b9e\u73b0\u7684\u7ec4\u4ef6\uff0c\u66f4\u80fd\u8ba9\u7a0b\u5e8f\u5c3d\u91cf\u6309\u7b26\u5408\u9884\u671f\u7684\u3001\u4e0d\u6613\u51fa\u9519\u7684\u65b9\u5f0f\u6267\u884c\u3002<\/p>\n<p>Go \u4e2d\u7528\u4e8e\u5e76\u53d1\u534f\u7a0b\u540c\u6b65\u6570\u636e\u7684\u7ec4\u4ef6\u4e3b\u8981\u5206\u4e3a 2 \u5927\u7c7b\uff0c\u4e00\u4e2a\u662f sync \u548csync\/atomic\u5305\u91cc\u9762\u7684\uff0c\u5982sync.Mutex\u3001sync.RWMutex\u3001sync.WaitGroup\u7b49\uff0c\u53e6\u4e00\u4e2a\u662f channel\u3002\u53ea\u6709channel\u624d\u662fGo\u8bed\u8a00\u63a8\u8350\u7684\u5e76\u53d1\u540c\u6b65\u7684\u65b9\u5f0f\uff0c\u662f\u4e00\u7b49\u516c\u6c11\uff0c\u7528\u6237\u4f7f\u7528channel\u751a\u81f3\u4e0d\u9700\u8981\u5f15\u5165\u5305\u540d\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927706\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2><strong>Channel\u7ed3\u6784<\/strong><\/h2>\n<p>channel\u7684\u5e95\u5c42\u6570\u636e\u7ed3\u6784\u662fhchan\uff0c\u5728src\/runtime\/chan.go \u4e2d\u3002<\/p>\n<pre><code>type hchan struct {\n  qcount   uint                 \/\/ \u961f\u5217\u4e2d\u6240\u6709\u6570\u636e\u603b\u6570\n  dataqsiz uint                 \/\/ \u5faa\u73af\u961f\u5217\u5927\u5c0f\n  buf      unsafe.Pointer       \/\/ \u6307\u5411\u5faa\u73af\u961f\u5217\u7684\u6307\u9488\n  elemsize uint16               \/\/ \u5faa\u73af\u961f\u5217\u4e2d\u5143\u7d20\u7684\u5927\u5c0f\n  closed   uint32               \/\/ chan\u662f\u5426\u5173\u95ed\u7684\u6807\u8bc6\n  elemtype *_type               \/\/ \u5faa\u73af\u961f\u5217\u4e2d\u5143\u7d20\u7684\u7c7b\u578b\n  sendx    uint                 \/\/ \u5df2\u53d1\u9001\u5143\u7d20\u5728\u5faa\u73af\u961f\u5217\u4e2d\u7684\u4f4d\u7f6e\n  recvx    uint                 \/\/ \u5df2\u63a5\u6536\u5143\u7d20\u5728\u5faa\u73af\u961f\u5217\u4e2d\u7684\u4f4d\u7f6e\n  recvq    waitq                \/\/ \u7b49\u5f85\u63a5\u6536\u7684goroutine\u7684\u7b49\u5f85\u961f\u5217\n  sendq    waitq                \/\/ \u7b49\u5f85\u53d1\u9001\u7684goroutine\u7684\u7b49\u5f85\u961f\u5217\n  lock mutex                    \/\/ \u63a7\u5236chan\u5e76\u53d1\u8bbf\u95ee\u7684\u4e92\u65a5\u9501\n}<\/code><\/pre>\n<p>qcount\u4ee3\u8868chan\u4e2d\u5df2\u7ecf\u63a5\u6536\u4f46\u8fd8\u6ca1\u88ab\u8bfb\u53d6\u7684\u5143\u7d20\u7684\u4e2a\u6570\uff1b<\/p>\n<p>dataqsiz\u4ee3\u8868\u5faa\u73af\u961f\u5217\u7684\u5927\u5c0f\uff1b<\/p>\n<p>buf \u662f\u6307\u5411\u5faa\u73af\u961f\u5217\u7684\u6307\u9488\uff0c\u5faa\u73af\u961f\u5217\u662f\u5927\u5c0f\u56fa\u5b9a\u7684\u7528\u6765\u5b58\u653echan\u63a5\u6536\u7684\u6570\u636e\u7684\u961f\u5217\uff1b<\/p>\n<p>elemtype \u548c elemsiz \u8868\u793a\u5faa\u73af\u961f\u5217\u4e2d\u5143\u7d20\u7684\u7c7b\u578b\u548c\u5143\u7d20\u7684\u5927\u5c0f\uff1b<\/p>\n<p>sendx\uff1a\u5f85\u53d1\u9001\u7684\u6570\u636e\u5728\u5faa\u73af\u961f\u5217buffer\u4e2d\u7684\u4f4d\u7f6e\u7d22\u5f15\uff1b<\/p>\n<p>recvx\uff1a\u5f85\u63a5\u6536\u7684\u6570\u636e\u5728\u5faa\u73af\u961f\u5217buffer\u4e2d\u7684\u4f4d\u7f6e\u7d22\u5f15\uff1b<\/p>\n<p>recvq \u548c sendq \u5206\u522b\u8868\u793a\u7b49\u5f85\u63a5\u6536\u6570\u636e\u7684 goroutine \u4e0e\u7b49\u5f85\u53d1\u9001\u6570\u636e\u7684 goroutine\uff1b<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927707\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p>sendq \u548c recvq \u5b58\u50a8\u4e86\u5f53\u524d Channel \u7531\u4e8e\u7f13\u51b2\u533a\u7a7a\u95f4\u4e0d\u8db3\u800c\u963b\u585e\u7684 Goroutine \u5217\u8868\uff0c\u8fd9\u4e9b\u7b49\u5f85\u961f\u5217\u4f7f\u7528\u53cc\u5411\u94fe\u8868 waitq \u8868\u793a\uff0c\u94fe\u8868\u4e2d\u6240\u6709\u7684\u5143\u7d20\u90fd\u662f sudog \u7ed3\u6784\uff1a<\/p>\n<pre><code>type waitq struct {\n  first *sudog\n  last  *sudog\n}<\/code><\/pre>\n<p>sudog\u4ee3\u8868\u7740\u7b49\u5f85\u961f\u5217\u4e2d\u7684\u4e00\u4e2agoroutine\uff0cG\u4e0e\u540c\u6b65\u5bf9\u8c61\uff08\u6307chan\uff09\u5173\u7cfb\u662f\u591a\u5bf9\u591a\u7684\u3002\u4e00\u4e2a G \u53ef\u4ee5\u51fa\u73b0\u5728\u8bb8\u591a\u7b49\u5f85\u961f\u5217\u4e0a\uff0c\u56e0\u6b64\u4e00\u4e2a G \u53ef\u80fd\u6709\u591a\u4e2asudog\u3002\u5e76\u4e14\u591a\u4e2a G \u53ef\u80fd\u6b63\u5728\u7b49\u5f85\u540c\u4e00\u4e2a\u540c\u6b65\u5bf9\u8c61\uff0c\u56e0\u6b64\u4e00\u4e2a\u5bf9\u8c61\u53ef\u80fd\u6709\u8bb8\u591a sudog\u3002sudog \u662f\u4ece\u7279\u6b8a\u6c60\u4e2d\u5206\u914d\u51fa\u6765\u7684\u3002\u4f7f\u7528 acquireSudog \u548c releaseSudog \u5206\u914d\u548c\u91ca\u653e\u5b83\u4eec\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927708\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927709\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2><strong>\u521b\u5efaChan<\/strong><\/h2>\n<p>Channel\u7684\u521b\u5efa\u4f1a\u4f7f\u7528make\u5173\u952e\u5b57\uff1a<\/p>\n<pre><code>ch := make(chan int, 10)<\/code><\/pre>\n<p>\u7f16\u8bd1\u5668\u7f16\u8bd1\u4e0a\u8ff0\u4ee3\u7801\uff0c\u5728\u68c0\u67e5ir\u8282\u70b9\u65f6\uff0c\u6839\u636e\u8282\u70b9op\u4e0d\u540c\u7c7b\u578b\uff0c\u8fdb\u884c\u4e0d\u540c\u7684\u68c0\u67e5\uff0c\u6e90\u7801\u5982\u4e0b\uff1a<\/p>\n<pre><code>func walkExpr1(n ir.Node, init *ir.Nodes) ir.Node {\n  switch n.Op() {\n  ......\n  case ir.OMAKECHAN:\n    n := n.(*ir.MakeExpr)\n    return walkMakeChan(n, init)\n  ......\n}<\/code><\/pre>\n<p>\u7f16\u8bd1\u5668\u4f1a\u5c06 make(chan int, 10) \u8868\u8fbe\u5f0f\u8f6c\u6362\u6210 OMAKE \u7c7b\u578b\u7684\u8282\u70b9\uff0c\u5e76\u5728\u7c7b\u578b\u68c0\u67e5\u9636\u6bb5\u5c06 OMAKE \u7c7b\u578b\u7684\u8282\u70b9\u8f6c\u6362\u6210 OMAKECHAN \u7c7b\u578b\uff0c\u8be5\u7c7b\u578b\u8282\u70b9\u4f1a\u8c03\u7528walkMakeChan\u51fd\u6570\u5904\u7406\uff1a<\/p>\n<pre><code>func walkMakeChan(n *ir.MakeExpr, init *ir.Nodes) ir.Node {\n  size := n.Len\n  fnname := &quot;makechan64&quot;\n  argtype := types.Types[types.TINT64]\n\n  if size.Type().IsKind(types.TIDEAL) || size.Type().Size() &lt;= types.Types[types.TUINT].Size() {\n    fnname = &quot;makechan&quot;\n    argtype = types.Types[types.TINT]\n  }\n\n  return mkcall1(chanfn(fnname, 1, n.Type()), n.Type(), init, reflectdata.TypePtr(n.Type()), typecheck.Conv(size, argtype))\n}<\/code><\/pre>\n<p>\u4e0a\u8ff0\u4ee3\u7801\u9ed8\u8ba4\u8c03\u7528makechan64()\u51fd\u6570\u3002\u5982\u679c\u5728make\u51fd\u6570\u4e2d\u4f20\u5165\u7684 channel size \u5927\u5c0f\u5728 int \u8303\u56f4\u5185\uff0c\u63a8\u8350\u4f7f\u7528 makechan()\u3002\u56e0\u4e3a makechan() \u5728 32 \u4f4d\u7684\u5e73\u53f0\u4e0a\u66f4\u5feb\uff0c\u7528\u7684\u5185\u5b58\u66f4\u5c11\u3002<\/p>\n<p>makechan64() \u65b9\u6cd5\u5728src\/runtime\/chan.go\uff0c\u53ea\u662f\u5224\u65ad\u4e00\u4e0b\u4f20\u5165\u7684\u5165\u53c2 size \u662f\u5426\u8fd8\u5728 int \u8303\u56f4\u4e4b\u5185\uff1a<\/p>\n<pre><code>func makechan64(t *chantype, size int64) *hchan {\n  if int64(int(size)) != size {\n    panic(plainError(&quot;makechan: size out of range&quot;))\n  }\n\n  return makechan(t, int(size))\n}<\/code><\/pre>\n<p>\u6700\u7ec8\u521b\u5efa channel \u8c03\u7528\u7684\u8fd8\u662fruntime.makechan() \u51fd\u6570\uff1a<\/p>\n<pre><code>func makechan(t *chantype, size int) *hchan {\n  elem := t.elem\n\n  \/\/ \u68c0\u67e5\u6570\u636e\u9879\u5927\u5c0f\u4e0d\u80fd\u8d85\u8fc7 64KB\n  if elem.size &gt;= 1&lt;&lt;16 {\n    throw(&quot;makechan: invalid channel element type&quot;)\n  }\n        \/\/ \u68c0\u67e5\u5185\u5b58\u5bf9\u9f50\u662f\u5426\u6b63\u786e\n  if hchanSize%maxAlign != 0 || elem.align &gt; maxAlign {\n    throw(&quot;makechan: bad alignment&quot;)\n  }\n        \/\/ \u7f13\u51b2\u533a\u5927\u5c0f\u68c0\u67e5\uff0c\u5224\u65ad\u662f\u5426\u6ea2\u51fa\n  mem, overflow := math.MulUintptr(elem.size, uintptr(size))\n  if overflow || mem &gt; maxAlloc-hchanSize || size &lt; 0 {\n    panic(plainError(&quot;makechan: size out of range&quot;))\n  }\n\n  var c *hchan\n  switch {\n  case mem == 0:\n    \/\/ \u961f\u5217\u6216\u8005\u5143\u7d20\u5927\u5c0f\u4e3a zero \u65f6\uff0c\u65e0\u987b\u521b\u5efabuf\u73af\u5f62\u961f\u5217.\n    c = (*hchan)(mallocgc(hchanSize, nil, true))\n    \/\/ \u7ade\u6001\u68c0\u67e5\uff0c\u5229\u7528\u8fd9\u4e2a\u5730\u5740\u8fdb\u884c\u540c\u6b65\u64cd\u4f5c.\n    c.buf = c.raceaddr()\n  case elem.ptrdata == 0:\n    \/\/ \u5143\u7d20\u4e0d\u662f\u6307\u9488\uff0c\u5206\u914d\u4e00\u5757\u8fde\u7eed\u7684\u5185\u5b58\u7ed9hchan\u6570\u636e\u7ed3\u6784\u548c\u7f13\u51b2\u533abuf\n    c = (*hchan)(mallocgc(hchanSize+mem, nil, true))\n                \/\/ \u8868\u793ahchan\u540e\u9762\u5728\u5185\u5b58\u91cc\u7d27\u8ddf\u7740\u5c31\u662fbuf\u73af\u5f62\u961f\u5217\n    c.buf = add(unsafe.Pointer(c), hchanSize)\n  default:\n    \/\/ \u5143\u7d20\u5305\u542b\u6307\u9488\uff0c\u5355\u72ec\u5206\u914d\u73af\u5f62\u961f\u5217buf\n    c = new(hchan)\n    c.buf = mallocgc(mem, elem, true)\n  }\n\n        \/\/ \u8bbe\u7f6e\u5143\u7d20\u4e2a\u6570\u3001\u5143\u7d20\u7c7b\u578b\u7ed9\u521b\u5efa\u7684chan\n  c.elemsize = uint16(elem.size)\n  c.elemtype = elem\n  c.dataqsiz = uint(size)\n  lockInit(&amp;c.lock, lockRankHchan)\n\n  if debugChan {\n    print(&quot;makechan: chan=&quot;, c, &quot;; elemsize=&quot;, elem.size, &quot;; dataqsiz=&quot;, size, &quot;\/n&quot;)\n  }\n  return c\n}<\/code><\/pre>\n<p>\u4e0a\u9762\u8fd9\u6bb5 makechan() \u4ee3\u7801\u4e3b\u8981\u76ee\u7684\u662f\u751f\u6210 *hchan \u5bf9\u8c61\u3002\u91cd\u70b9\u5173\u6ce8 switch-case \u4e2d\u7684 3 \u79cd\u60c5\u51b5\uff1a<\/p>\n<p>1.\u5f53\u961f\u5217\u6216\u8005\u5143\u7d20\u5927\u5c0f\u4e3a 0 \u65f6\uff0c\u8c03\u7528 mallocgc() \u5728\u5806\u4e0a\u4e3a channel \u5f00\u8f9f\u4e00\u6bb5\u5927\u5c0f\u4e3a hchanSize \u7684\u5185\u5b58\u7a7a\u95f4\uff1b<\/p>\n<p>2.\u5f53\u5143\u7d20\u7c7b\u578b\u4e0d\u662f\u6307\u9488\u7c7b\u578b\u65f6\uff0c\u8c03\u7528 mallocgc() \u5728\u5806\u4e0a\u4e3a channel \u548c\u5e95\u5c42 buf \u7f13\u51b2\u533a\u6570\u7ec4\u5f00\u8f9f\u4e00\u6bb5\u5927\u5c0f\u4e3a hchanSize + mem \u8fde\u7eed\u7684\u5185\u5b58\u7a7a\u95f4\uff1b<\/p>\n<p>3.\u9ed8\u8ba4\u60c5\u51b5\u5143\u7d20\u7c7b\u578b\u4e2d\u6709\u6307\u9488\u7c7b\u578b\uff0c\u8c03\u7528 mallocgc() \u5728\u5806\u4e0a\u5206\u522b\u4e3a channel \u548c buf \u7f13\u51b2\u533a\u5206\u914d\u5185\u5b58\u3002<\/p>\n<p>\u8fd9\u91cc\u9700\u8981\u89e3\u91ca\u4e0b\uff1a\u5f53\u5b58\u50a8\u5728 buf \u4e2d\u7684\u5143\u7d20\u4e0d\u5305\u542b\u6307\u9488\u65f6\uff0chchan \u4e2d\u4e5f\u4e0d\u5305\u542b GC \u5173\u5fc3\u7684\u6307\u9488\u3002buf \u6307\u5411\u4e00\u6bb5\u76f8\u540c\u5143\u7d20\u7c7b\u578b\u7684\u5185\u5b58\uff0celemtype \u56fa\u5b9a\u4e0d\u53d8\u3002\u53d7\u5230\u5783\u573e\u56de\u6536\u5668\u7684\u9650\u5236\uff0c\u6307\u9488\u7c7b\u578b\u7684\u7f13\u51b2 buf \u9700\u8981\u5355\u72ec\u5206\u914d\u5185\u5b58\u3002<\/p>\n<p>channel\u672c\u8eab\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u5176\u521b\u5efa\u5168\u90e8\u8c03\u7528\u7684\u662f mallocgc()\uff0c\u5728\u5806\u4e0a\u5f00\u8f9f\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u8bf4\u660e channel \u672c\u8eab\u4f1a\u88ab GC \u81ea\u52a8\u56de\u6536\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927710\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2><strong>\u53d1\u9001\u6570\u636e<\/strong><\/h2>\n<p>\u5411 channel \u4e2d\u53d1\u9001\u6570\u636e\u4f7f\u7528 ch &lt;- 1 \u4ee3\u7801\uff0c\u7f16\u8bd1\u5668\u5728\u7f16\u8bd1\u5b83\u65f6\uff0c\u4f1a\u628a\u5b83\u89e3\u6790\u6210OSEND\u8282\u70b9\uff1a<\/p>\n<pre><code>func walkExpr1(n ir.Node, init *ir.Nodes) ir.Node {\n  switch n.Op() {\n  ......\n  case ir.OSEND:\n    n := n.(*ir.SendStmt)\n    return walkSend(n, init)\n  ......\n}<\/code><\/pre>\n<p>\u5bf9OSEND\u8282\u70b9\u4f1a\u8c03\u7528 walkSend()\u51fd\u6570\u5904\u7406\uff1a<\/p>\n<pre><code>func walkSend(n *ir.SendStmt, init *ir.Nodes) ir.Node {\n  n1 := n.Value\n  n1 = typecheck.AssignConv(n1, n.Chan.Type().Elem(), &quot;chan send&quot;)\n  n1 = walkExpr(n1, init)\n  n1 = typecheck.NodAddr(n1)\n  return mkcall1(chanfn(&quot;chansend1&quot;, 2, n.Chan.Type()), nil, init, n.Chan, n1)\n}<\/code><\/pre>\n<p>\u8fd0\u884c\u65f6\u7684chansend1()\u51fd\u6570\u5b9e\u9645\u8c03\u7528\u7684\u662fchansend()\uff1a<\/p>\n<pre><code>func chansend1(c *hchan, elem unsafe.Pointer) {\n  chansend(c, elem, true, getcallerpc())\n}<\/code><\/pre>\n<p>chansend()\u51fd\u6570\u7684\u4e3b\u8981\u903b\u8f91\u662f\uff1a<\/p>\n<p>1.\u5728chan\u4e3a nil \u672a\u521d\u59cb\u5316\u7684\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8eselect\u8fd9\u79cd\u975e\u963b\u585e\u7684\u53d1\u9001\uff0c\u76f4\u63a5\u8fd4\u56de false\uff1b\u5bf9\u4e8e\u963b\u585e\u7684\u53d1\u9001\uff0c\u5c06 goroutine \u6302\u8d77\uff0c\u5e76\u4e14\u6c38\u8fdc\u4e0d\u4f1a\u8fd4\u56de\u3002<\/p>\n<pre><code>func chansend(c *hchan, ep unsafe.Pointer, block bool, callerpc uintptr) bool {\n        \/\/ \u5982\u679cchan\u4e3anil\n  if c == nil {\n                \/\/ \u5bf9\u4e8eselect\u8fd9\u79cd\u975e\u963b\u585e\u7684\u53d1\u9001,\u76f4\u63a5\u8fd4\u56de\n    if !block {\n      return false\n    }\n                \/\/ \u5bf9\u4e8e\u963b\u585e\u7684\u901a\u9053\uff0c\u5c06 goroutine \u6302\u8d77\n    gopark(nil, nil, waitReasonChanSendNilChan, traceEvGoStop, 2)\n    throw(&quot;unreachable&quot;)\n  }\n        ......\n}<\/code><\/pre>\n<p>2.\u975e\u963b\u585e\u53d1\u9001\u7684\u60c5\u51b5\u4e0b\uff0c\u5f53 channel \u4e0d\u4e3a nil\uff0c\u5e76\u4e14 channel \u6ca1\u6709\u5173\u95ed\u65f6\uff0c\u5982\u679c\u6ca1\u6709\u7f13\u51b2\u533a\u4e14\u6ca1\u6709\u63a5\u6536\u8005receiver\uff0c\u6216\u8005\u7f13\u51b2\u533a\u5df2\u7ecf\u6ee1\u4e86\uff0c\u8fd4\u56de false\u3002<\/p>\n<pre><code>        if !block &amp;&amp; c.closed == 0 &amp;&amp; full(c) {\n    return false\n  }<\/code><\/pre>\n<p>full() \u65b9\u6cd5\u4f5c\u7528\u662f\u5224\u65ad\u5728 channel \u4e0a\u53d1\u9001\u662f\u5426\u4f1a\u963b\u585e\uff0c\u7528\u6765\u5224\u65ad\u7684\u53c2\u6570\u662fqcount\uff0cc.recvq.first\uff0cdataqsiz\uff0c\u524d\u4e24\u4e2a\u53d8\u91cf\u90fd\u662f\u5355\u5b57\u957f\u7684\uff0c\u6240\u4ee5\u5bf9\u5b83\u4eec\u5355\u4e2a\u503c\u7684\u8bfb\u64cd\u4f5c\u662f\u539f\u5b50\u6027\u7684\u3002dataqsiz\u5b57\u6bb5\uff0c\u5b83\u5728\u521b\u5efa\u5b8c channel \u4ee5\u540e\u662f\u4e0d\u53ef\u53d8\u7684\uff0c\u56e0\u6b64\u5b83\u53ef\u4ee5\u5b89\u5168\u7684\u5728\u4efb\u610f\u65f6\u523b\u8bfb\u53d6\u3002<\/p>\n<pre><code>func full(c *hchan) bool {\n  \/\/ \u5982\u679c\u5faa\u73af\u961f\u5217\u5927\u5c0f\u4e3a0\n  if c.dataqsiz == 0 {\n    \/\/ \u5047\u8bbe\u6307\u9488\u8bfb\u53d6\u662f\u8fd1\u4f3c\u539f\u5b50\u6027\u7684\uff0c\u8fd9\u91cc\u7528\u6765\u5224\u65ad\u6ca1\u6709\u63a5\u6536\u8005\n    return c.recvq.first == nil\n  }\n  \/\/ \u961f\u5217\u6ee1\u4e86\n  return c.qcount == c.dataqsiz\n}<\/code><\/pre>\n<p>3.\u63a5\u4e0b\u6765\uff0c\u5bf9chan\u52a0\u9501\uff0c\u5224\u65adchan\u4e0d\u662f\u5173\u95ed\u72b6\u6001\uff0c\u518d\u4ecerecvq\u961f\u5217\u4e2d\u53d6\u51fa\u4e00\u4e2a\u63a5\u6536\u8005\uff0c\u5982\u679c\u63a5\u6536\u8005\u5b58\u5728\uff0c\u5219\u76f4\u63a5\u5411\u5b83\u53d1\u9001\u6d88\u606f\uff0c\u7ed5\u8fc7\u5faa\u73af\u961f\u5217buf\uff0c\u6b64\u65f6\uff0c\u7531\u4e8e\u6709\u63a5\u6536\u8005\u5b58\u5728\uff0c\u5219\u5faa\u73af\u961f\u5217buf\u4e00\u5b9a\u662f\u7a7a\u7684\u3002<\/p>\n<pre><code>        ......\n        \/\/ \u5bf9chan\u52a0\u9501\n        lock(&amp;c.lock)\n\n        \/\/ \u68c0\u67e5chan\u662f\u5426\u5173\u95ed\n  if c.closed != 0 {\n    unlock(&amp;c.lock)\n    panic(plainError(&quot;send on closed channel&quot;))\n  }\n\n        \/\/ \u4ece recvq \u4e2d\u53d6\u51fa\u4e00\u4e2a\u63a5\u6536\u8005\n  if sg := c.recvq.dequeue(); sg != nil {\n    \/\/ \u5982\u679c\u63a5\u6536\u8005\u5b58\u5728\uff0c\u76f4\u63a5\u5411\u8be5\u63a5\u6536\u8005\u53d1\u9001\u6570\u636e\uff0c\u7ed5\u8fc7\u5faa\u73af\u961f\u5217buf\n    send(c, sg, ep, func() { unlock(&amp;c.lock) }, 3)\n    return true\n  }\n        ......<\/code><\/pre>\n<p>send() \u51fd\u6570\u4e3b\u8981\u5b8c\u6210\u4e86 2 \u4ef6\u4e8b\uff1a\u8c03\u7528 sendDirect() \u51fd\u6570\u5c06\u6570\u636e\u62f7\u8d1d\u5230\u4e86\u63a5\u6536\u8005\u7684\u5185\u5b58\u5730\u5740\u4e0a\uff1b\u8c03\u7528 goready() \u5c06\u7b49\u5f85\u63a5\u6536\u7684\u963b\u585e goroutine \u7684\u72b6\u6001\u4ece Gwaiting \u6216\u8005 Gscanwaiting \u6539\u53d8\u6210 Grunnable\u3002<\/p>\n<pre><code>func send(c *hchan, sg *sudog, ep unsafe.Pointer, unlockf func(), skip int) {\n  ......\n  if sg.elem != nil {\n                \/\/ \u76f4\u63a5\u628a\u8981\u53d1\u9001\u7684\u6570\u636e\u62f7\u8d1d\u5230receiver\u7684\u5185\u5b58\u5730\u5740\n    sendDirect(c.elemtype, sg, ep)\n    sg.elem = nil\n  }\n  gp := sg.g\n  unlockf()\n  gp.param = unsafe.Pointer(sg)\n  sg.success = true\n  if sg.releasetime != 0 {\n    sg.releasetime = cputicks()\n  }\n        \/\/ \u5524\u9192\u7b49\u5f85\u7684\u63a5\u6536\u8005goroutine\n  goready(gp, skip+1)\n}<\/code><\/pre>\n<p>4.\u56de\u5230chansend()\u65b9\u6cd5\uff0c\u63a5\u4e0b\u6765\u662f\u6709\u7f13\u51b2\u533a\u7684\u5f02\u6b65\u53d1\u9001\u7684\u903b\u8f91\u3002<\/p>\n<pre><code>\/\/ \u5982\u679c\u7f13\u51b2\u533a\u6ca1\u6709\u6ee1\uff0c\u76f4\u63a5\u5c06\u8981\u53d1\u9001\u7684\u6570\u636e\u590d\u5236\u5230\u7f13\u51b2\u533a\n        if c.qcount &lt; c.dataqsiz {\n    \/\/ \u627e\u5230\u8981\u53d1\u9001\u6570\u636e\u5230\u5faa\u73af\u961f\u5217buf\u7684\u7d22\u5f15\u4f4d\u7f6e\n    qp := chanbuf(c, c.sendx)\n    ......\n                \/\/ \u6570\u636e\u62f7\u8d1d\u5230\u5faa\u73af\u961f\u5217\u4e2d\n    typedmemmove(c.elemtype, qp, ep)\n                \/\/ \u5c06\u5f85\u53d1\u9001\u6570\u636e\u7d22\u5f15\u52a01\uff0c\u7531\u4e8e\u662f\u5faa\u73af\u961f\u5217\uff0c\u5982\u679c\u5230\u4e86\u672b\u5c3e\uff0c\u4ece0\u5f00\u59cb\n    c.sendx++\n    if c.sendx == c.dataqsiz {\n      c.sendx = 0\n    }\n                \/\/ chan\u4e2d\u5143\u7d20\u4e2a\u6570\u52a01\uff0c\u91ca\u653e\u9501\u8fd4\u56detrue\n    c.qcount++\n    unlock(&amp;c.lock)\n    return true\n  }<\/code><\/pre>\n<p>\u5982\u679c\u7f13\u51b2\u533abuf\u8fd8\u6ca1\u6709\u6ee1\uff0c\u8c03\u7528 chanbuf() \u83b7\u53d6 sendx \u7d22\u5f15\u7684\u5143\u7d20\u6307\u9488\u503c\u3002\u8c03\u7528 typedmemmove() \u65b9\u6cd5\u5c06\u53d1\u9001\u7684\u503c\u62f7\u8d1d\u5230\u7f13\u51b2\u533a buf \u4e2d\u3002\u62f7\u8d1d\u5b8c\u6210\uff0c\u589e\u52a0 sendx \u7d22\u5f15\u4e0b\u6807\u503c\u548c qcount \u4e2a\u6570\u3002<\/p>\n<p>5.\u5982\u679c\u6267\u884c\u524d\u9762\u7684\u6b65\u9aa4\u8fd8\u6ca1\u6709\u6210\u529f\u53d1\u9001\uff0c\u5c31\u8868\u793a\u7f13\u51b2\u533a\u6ca1\u6709\u7a7a\u95f4\u4e86\uff0c\u800c\u4e14\u4e5f\u6ca1\u6709\u4efb\u4f55\u63a5\u6536\u8005\u5728\u7b49\u5f85\u3002\u540e\u9762\u9700\u8981\u5c06 goroutine \u6302\u8d77\u7136\u540e\u7b49\u5f85\u65b0\u7684\u63a5\u6536\u8005\u4e86\u3002<\/p>\n<pre><code>   \/\/ \u7f13\u51b2\u533a\u6ca1\u6709\u7a7a\u95f4\uff0c\u5bf9\u4e8eselect\u8fd9\u79cd\u975e\u963b\u585e\u8c03\u7528\u76f4\u63a5\u8fd4\u56defalse\n        if !block {\n    unlock(&amp;c.lock)\n    return false\n  }\n\n  \/\/ \u4e0b\u9762\u7684\u903b\u8f91\u662f\u5c06\u5f53\u524dgoroutine\u6302\u8d77\n        \/\/ \u8c03\u7528 getg()\u65b9\u6cd5\u83b7\u53d6\u5f53\u524dgoroutine\u7684\u6307\u9488\uff0c\u7528\u4e8e\u7ed1\u5b9a\u7ed9\u4e00\u4e2a sudog\n  gp := getg()\n        \/\/ \u8c03\u7528 acquireSudog()\u65b9\u6cd5\u83b7\u53d6\u4e00\u4e2a sudog\uff0c\u53ef\u80fd\u662f\u65b0\u5efa\u7684 sudog\uff0c\u4e5f\u6709\u53ef\u80fd\u662f\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u7684\u3002\u8bbe\u7f6e\u597dsudog\u8981\u53d1\u9001\u7684\u6570\u636e\u548c\u72b6\u6001\u3002\u6bd4\u5982\u53d1\u9001\u7684 Channel\u3001\u662f\u5426\u5728 select \u4e2d\u548c\u5f85\u53d1\u9001\u6570\u636e\u7684\u5185\u5b58\u5730\u5740\u7b49\u7b49\u3002\n  mysg := acquireSudog()\n  mysg.releasetime = 0\n  if t0 != 0 {\n    mysg.releasetime = -1\n  }\n\n  mysg.elem = ep\n  mysg.waitlink = nil\n  mysg.g = gp\n  mysg.isSelect = false\n  mysg.c = c\n  gp.waiting = mysg\n  gp.param = nil\n        \/\/ \u8c03\u7528 c.sendq.enqueue \u65b9\u6cd5\u5c06\u914d\u7f6e\u597d\u7684 sudog \u52a0\u5165\u5f85\u53d1\u9001\u7684\u7b49\u5f85\u961f\u5217\n  c.sendq.enqueue(mysg)\n  atomic.Store8(&amp;gp.parkingOnChan, 1)\n        \/\/ \u8c03\u7528gopark\u65b9\u6cd5\u6302\u8d77\u5f53\u524dgoroutine\uff0c\u72b6\u6001\u4e3awaitReasonChanSend\uff0c\u963b\u585e\u7b49\u5f85channel\u63a5\u6536\u8005\u7684\u6fc0\u6d3b\n  gopark(chanparkcommit, unsafe.Pointer(&amp;c.lock), waitReasonChanSend, traceEvGoBlockSend, 2)\n  \/\/ \u6700\u540e\uff0cKeepAlive() \u786e\u4fdd\u53d1\u9001\u7684\u503c\u4fdd\u6301\u6d3b\u52a8\u72b6\u6001\uff0c\u76f4\u5230\u63a5\u6536\u8005\u5c06\u5176\u590d\u5236\u51fa\u6765\n  KeepAlive(ep)<\/code><\/pre>\n<p>6.chansend()\u65b9\u6cd5\u6700\u540e\u7684\u4ee3\u7801\u662f\u5f53goroutine\u5524\u9192\u4ee5\u540e\uff0c\u89e3\u9664\u963b\u585e\u7684\u72b6\u6001\u3002<\/p>\n<pre><code>func chansend(c *hchan, ep unsafe.Pointer, block bool, callerpc uintptr) bool {\n        ......\n  if mysg != gp.waiting {\n    throw(&quot;G waiting list is corrupted&quot;)\n  }\n  gp.waiting = nil\n  gp.activeStackChans = false\n  closed := !mysg.success\n  gp.param = nil\n  if mysg.releasetime &gt; 0 {\n    blockevent(mysg.releasetime-t0, 2)\n  }\n  mysg.c = nil\n  releaseSudog(mysg)\n  if closed {\n    if c.closed == 0 {\n      throw(&quot;chansend: spurious wakeup&quot;)\n    }\n    panic(plainError(&quot;send on closed channel&quot;))\n  }\n  return true\n}<\/code><\/pre>\n<p>\u7efc\u4e0a\u6240\u8ff0\uff1a<\/p>\n<p>1.\u9996\u5148select\u8fd9\u79cd\u975e\u963b\u585e\u7684\u53d1\u9001\uff0c\u5224\u65ad\u4e24\u79cd\u60c5\u51b5\uff1b<\/p>\n<p>2.\u7136\u540e\u662f\u4e00\u822c\u7684\u963b\u585e\u8c03\u7528\uff0c\u5148\u5224\u65adrecvq\u7b49\u5f85\u63a5\u6536\u961f\u5217\u662f\u5426\u4e3a\u7a7a\uff0c\u4e0d\u4e3a\u7a7a\u8bf4\u660e\u7f13\u51b2\u533a\u4e2d\u6ca1\u6709\u5185\u5bb9\u6216\u8005\u662f\u4e00\u4e2a\u65e0\u7f13\u51b2channel\uff1b<\/p>\n<p>3.\u5982\u679crecvq\u6709\u63a5\u6536\u8005\uff0c\u5219\u7f13\u51b2\u533a\u4e00\u5b9a\u4e3a\u7a7a\uff0c\u76f4\u63a5\u4ecerecvq\u4e2d\u53d6\u51fa\u4e00\u4e2agoroutine\uff0c\u7136\u540e\u5199\u5165\u6570\u636e\uff0c\u63a5\u7740\u5524\u9192 goroutine\uff0c\u7ed3\u675f\u53d1\u9001\u8fc7\u7a0b\uff1b<\/p>\n<p>4.\u5982\u679c\u7f13\u51b2\u533a\u6709\u7a7a\u4f59\u7684\u4f4d\u7f6e\uff0c\u5199\u5165\u6570\u636e\u5230\u7f13\u51b2\u533a\uff0c\u5b8c\u6210\u53d1\u9001\uff1b<\/p>\n<p>5.\u5982\u679c\u7f13\u51b2\u533a\u6ee1\u4e86\uff0c\u90a3\u4e48\u5c31\u628a\u53d1\u9001\u6570\u636e\u7684goroutine\u653e\u5230sendq\u4e2d\uff0c\u8fdb\u5165\u7761\u7720\uff0c\u7b49\u5f85\u8be5goroutine\u88ab\u5524\u9192\u3002  <\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927711\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2><strong>\u63a5\u6536\u6570\u636e<\/strong><\/h2>\n<p>\u4ecechannel\u4e2d\u63a5\u6536\u6570\u636e\u7684\u4ee3\u7801\u662f\uff1a<\/p>\n<pre><code>i &lt;- ch\ni, ok &lt;- ch<\/code><\/pre>\n<p>\u7ecf\u8fc7\u7f16\u8bd1\u5668\u7684\u5904\u7406\uff0c\u4f1a\u89e3\u6790\u6210ORECV\u8282\u70b9\uff0c\u540e\u8005\u4f1a\u5728\u7c7b\u578b\u68c0\u67e5\u9636\u6bb5\u88ab\u8f6c\u6362\u6210 OAS2RECV \u7c7b\u578b\u3002\u6700\u7ec8\uff0c\u8fd9\u4e24\u79cd\u4e0d\u540c\u7684 channel \u63a5\u6536\u65b9\u5f0f\u4f1a\u8f6c\u6362\u6210 runtime.chanrecv1 \u548c runtime.chanrecv2 \u4e24\u79cd\u4e0d\u540c\u51fd\u6570\u7684\u8c03\u7528\uff0c\u4f46\u662f\u6700\u7ec8\u6838\u5fc3\u903b\u8f91\u8fd8\u662f\u5728 runtime.chanrecv \u4e2d\u3002<\/p>\n<p>\u4e0b\u9762\u76f4\u63a5\u770bchanrecv()\u65b9\u6cd5\u7684\u903b\u8f91\uff1a<\/p>\n<p>1.chanrecv()\u65b9\u6cd5\u6709\u4e24\u4e2a\u8fd4\u56de\u503c\uff0cselected, received bool\uff0c\u524d\u8005\u8868\u793a\u662f\u5426\u63a5\u6536\u5230\u503c\uff0c\u540e\u8005\u8868\u793a\u63a5\u6536\u7684\u503c\u662f\u5426\u5173\u95ed\u540e\u53d1\u9001\u7684\u3002\u6709\u4e09\u79cd\u60c5\u51b5\uff1a\u5982\u679c\u662f\u975e\u963b\u585e\u7684\u60c5\u51b5\uff0c\u6ca1\u6709\u6570\u636e\u53ef\u4ee5\u63a5\u6536\uff0c\u5219\u8fd4\u56de (false,flase)\uff1b\u5982\u679c chan \u5df2\u7ecf\u5173\u95ed\u4e86\uff0c\u5c06 ep \u6307\u5411\u7684\u503c\u7f6e\u4e3a 0\u503c\uff0c\u5e76\u4e14\u8fd4\u56de (true, false)\uff1b\u5176\u5b83\u60c5\u51b5\u8fd4\u56de\u503c\u4e3a (true,true)\uff0c\u8868\u793a\u6210\u529f\u4ece chan \u4e2d\u83b7\u53d6\u5230\u4e86\u6570\u636e\uff0c\u4e14\u662fchan\u672a\u5173\u95ed\u53d1\u9001\u3002<\/p>\n<pre><code>\/\/ If block == false and no elements are available, returns (false, false).\n\/\/ Otherwise, if c is closed, zeros *ep and returns (true, false).\n\/\/ Otherwise, fills in *ep with an element and returns (true, true).\nfunc chanrecv(c *hchan, ep unsafe.Pointer, block bool) (selected, received bool) {\n         ......\n}<\/code><\/pre>\n<p>2.\u9996\u5148\u5224\u65ad\u5982\u679cchan\u4e3a\u7a7a\uff0c\u4e14\u662fselect\u8fd9\u79cd\u975e\u963b\u585e\u8c03\u7528\uff0c\u90a3\u4e48\u76f4\u63a5\u8fd4\u56de (false,false)\uff0c\u5426\u5219\u963b\u585e\u5f53\u524d\u7684goroutine\u3002<\/p>\n<pre><code>func chanrecv(c *hchan, ep unsafe.Pointer, block bool) (selected, received bool) {\n  ......\n        \/\/ \u5982\u679cc\u4e3a\u7a7a\n  if c == nil {\n                \/\/ \u5982\u679cc\u4e3a\u7a7a\u4e14\u662f\u975e\u963b\u585e\u8c03\u7528\uff0c\u90a3\u4e48\u76f4\u63a5\u8fd4\u56de (false,false)\n    if !block {\n      return\n    }\n                \/\/\u963b\u585e\u5f53\u524d\u7684goroutine\n    gopark(nil, nil, waitReasonChanReceiveNilChan, traceEvGoStop, 2)\n    throw(&quot;unreachable&quot;)\n  }\n        ......\n}<\/code><\/pre>\n<p>3.\u5982\u679c\u662f\u975e\u963b\u585e\u8c03\u7528\uff0c\u901a\u8fc7empty()\u65b9\u6cd5\u539f\u5b50\u5224\u65ad\u662f\u65e0\u7f13\u51b2chan\u6216\u8005\u662fchan\u4e2d\u6ca1\u6709\u6570\u636e\u4e14chan\u6ca1\u6709\u5173\u95ed\uff0c\u5219\u8fd4\u56de\uff08false,false\uff09\uff0c\u5982\u679cchan\u5173\u95ed\uff0c\u4e3a\u4e86\u9632\u6b62\u68c0\u67e5\u671f\u95f4\u7684\u72b6\u6001\u53d8\u5316\uff0c\u4e8c\u6b21\u8c03\u7528empty()\u8fdb\u884c\u539f\u5b50\u68c0\u67e5\uff0c\u5982\u679c\u662f\u65e0\u7f13\u51b2chan\u6216\u8005\u662fchan\u4e2d\u6ca1\u6709\u6570\u636e\uff0c\u8fd4\u56de (true, false)\uff0c\u8fd9\u91cc\u7684\u7b2c\u4e00\u4e2atrue\u8868\u793achan\u5173\u95ed\u540e\u8bfb\u53d6\u7684 0 \u503c\u3002<\/p>\n<pre><code>        \/\/\u975e\u963b\u585e\u8c03\u7528\uff0c\u901a\u8fc7empty()\u5224\u65ad\u662f\u65e0\u7f13\u51b2chan\u6216\u8005\u662fchan\u4e2d\u6ca1\u6709\u6570\u636e\n  if !block &amp;&amp; empty(c) {\n    \/\/ \u5982\u679cchan\u6ca1\u6709\u5173\u95ed\uff0c\u5219\u76f4\u63a5\u8fd4\u56de (false, false)\n    if atomic.Load(&amp;c.closed) == 0 {\n      return\n    }\n\n                \/\/ \u5982\u679cchan\u5173\u95ed, \u4e3a\u4e86\u9632\u6b62\u68c0\u67e5\u671f\u95f4\u7684\u72b6\u6001\u53d8\u5316\uff0c\u4e8c\u6b21\u8c03\u7528empty()\u8fdb\u884c\u539f\u5b50\u68c0\u67e5\uff0c\u5982\u679c\u662f\u65e0\u7f13\u51b2chan\u6216\u8005\u662fchan\u4e2d\u6ca1\u6709\u6570\u636e\uff0c\u8fd4\u56de (true, false)\n    if empty(c) {\n      if raceenabled {\n        raceacquire(c.raceaddr())\n      }\n      if ep != nil {\n        typedmemclr(c.elemtype, ep)\n      }\n      return true, false\n    }\n  }<\/code><\/pre>\n<pre><code>func empty(c *hchan) bool {\n  \/\/ c.dataqsiz \u662f\u4e0d\u53ef\u53d8\u7684\n  if c.dataqsiz == 0 {\n    return atomic.Loadp(unsafe.Pointer(&amp;c.sendq.first)) == nil\n  }\n  return atomic.Loaduint(&amp;c.qcount) == 0\n}<\/code><\/pre>\n<p>4.\u63a5\u4e0b\u6765\u963b\u585e\u8c03\u7528\u7684\u903b\u8f91\uff0cchanrecv\u65b9\u6cd5\u5bf9chan\u52a0\u9501\uff0c\u5224\u65adchan\u5982\u679c\u5df2\u7ecf\u5173\u95ed\uff0c\u5e76\u4e14chan\u4e2d\u6ca1\u6709\u6570\u636e\uff0c\u8fd4\u56de (true,false)\uff0c\u8fd9\u91cc\u7684\u7b2c\u4e00\u4e2atrue\u8868\u793achan\u5173\u95ed\u540e\u8bfb\u53d6\u7684 0 \u503c\u3002<\/p>\n<pre><code>        ......\n        \/\/ \u5bf9chan\u52a0\u9501\n        lock(&amp;c.lock)\n        \/\/ \u5982\u679c\u5df2\u7ecf\u5173\u95ed\uff0c\u5e76\u4e14chan\u4e2d\u6ca1\u6709\u6570\u636e\uff0c\u8fd4\u56de (true,false)\n  if c.closed != 0 &amp;&amp; c.qcount == 0 {\n    if raceenabled {\n      raceacquire(c.raceaddr())\n    }\n    unlock(&amp;c.lock)\n    if ep != nil {\n      typedmemclr(c.elemtype, ep)\n    }\n    return true, false\n  }\n        ......<\/code><\/pre>\n<p>5.\u63a5\u4e0b\u6765\uff0c\u4ece\u53d1\u9001\u961f\u5217\u4e2d\u83b7\u53d6\u4e00\u4e2a\u7b49\u5f85\u53d1\u9001\u7684 goroutine\uff0c\u5373\u53d6\u51fa\u7b49\u5f85\u961f\u5217\u961f\u5934\u7684 goroutine\u3002\u5982\u679c\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u4e3a 0\uff0c\u5219\u76f4\u63a5\u4ece\u53d1\u9001\u65b9\u63a5\u6536\u503c\u3002\u5426\u5219\uff0c\u5bf9\u5e94\u7f13\u51b2\u533a\u6ee1\u7684\u60c5\u51b5\uff0c\u4ece\u961f\u5217\u7684\u5934\u90e8\u63a5\u6536\u6570\u636e\uff0c\u53d1\u9001\u8005\u7684\u503c\u6dfb\u52a0\u5230\u961f\u5217\u7684\u672b\u5c3e\uff08\u6b64\u65f6\u961f\u5217\u5df2\u6ee1\uff0c\u56e0\u6b64\u4e24\u8005\u90fd\u6620\u5c04\u5230\u7f13\u51b2\u533a\u4e2d\u7684\u540c\u4e00\u4e2a\u4e0b\u6807\uff09\u3002\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\uff0c\u7531\u4e8e\u6709\u53d1\u9001\u8005\u5728\u7b49\u5f85\uff0c\u6240\u4ee5\u5982\u679c\u6709\u7f13\u51b2\u533a\uff0c\u90a3\u4e48\u7f13\u51b2\u533a\u4e00\u5b9a\u662f\u6ee1\u7684\u3002<\/p>\n<pre><code>       ......\n       \/\/ \u4ece\u53d1\u9001\u8005\u961f\u5217\u83b7\u53d6\u7b49\u5f85\u53d1\u9001\u7684 goroutine  \n       if sg := c.sendq.dequeue(); sg != nil {\n    \/\/\u5728 channel \u7684\u53d1\u9001\u961f\u5217\u4e2d\u627e\u5230\u4e86\u7b49\u5f85\u53d1\u9001\u7684 goroutine\uff0c\u53d6\u51fa\u961f\u5934\u7b49\u5f85\u7684 goroutine\u3002\u5982\u679c\u7f13\u51b2\u533a\u7684\u5927\u5c0f\u4e3a 0\uff0c\u5219\u76f4\u63a5\u4ece\u53d1\u9001\u65b9\u63a5\u6536\u503c\u3002\u5426\u5219\uff0c\u5bf9\u5e94\u7f13\u51b2\u533a\u6ee1\u7684\u60c5\u51b5\uff0c\u4ece\u961f\u5217\u7684\u5934\u90e8\u63a5\u6536\u6570\u636e\uff0c\u53d1\u9001\u8005\u7684\u503c\u6dfb\u52a0\u5230\u961f\u5217\u7684\u672b\u5c3e\uff08\u6b64\u65f6\u961f\u5217\u5df2\u6ee1\uff0c\u56e0\u6b64\u4e24\u8005\u90fd\u6620\u5c04\u5230\u7f13\u51b2\u533a\u4e2d\u7684\u540c\u4e00\u4e2a\u4e0b\u6807\uff09\n    recv(c, sg, ep, func() { unlock(&amp;c.lock) }, 3)\n    return true, true\n  }<\/code><\/pre>\n<pre><code>func recv(c *hchan, sg *sudog, ep unsafe.Pointer, unlockf func(), skip int) {\n  if c.dataqsiz == 0 {\n    if raceenabled {\n      racesync(c, sg)\n    }\n    if ep != nil {\n      \/\/ \u4ece\u53d1\u9001\u8005sender\u91cc\u9762\u62f7\u8d1d\u6570\u636e\n      recvDirect(c.elemtype, sg, ep)\n    }\n  } else {\n    \/\/ \u961f\u5217\u662f\u6ee1\u7684\n    qp := chanbuf(c, c.recvx)\n    if raceenabled {\n      racenotify(c, c.recvx, nil)\n      racenotify(c, c.recvx, sg)\n    }\n    \/\/ \u4ece\u7f13\u51b2\u533a\u62f7\u8d1d\u6570\u636e\u7ed9\u63a5\u6536\u8005receiver\n    if ep != nil {\n      typedmemmove(c.elemtype, ep, qp)\n    }\n    \/\/ \u4ece\u53d1\u9001\u8005sender\u62f7\u8d1d\u6570\u636e\u5230\u7f13\u51b2\u533a\n    typedmemmove(c.elemtype, qp, sg.elem)\n    c.recvx++\n    if c.recvx == c.dataqsiz {\n      c.recvx = 0\n    }\n    c.sendx = c.recvx \/\/ c.sendx = (c.sendx+1) % c.dataqsiz\n  }\n  sg.elem = nil\n  gp := sg.g\n  unlockf()\n  gp.param = unsafe.Pointer(sg)\n  sg.success = true\n  if sg.releasetime != 0 {\n    sg.releasetime = cputicks()\n  }\n        \/\/ \u5524\u9192\u53d1\u9001\u8005\n  goready(gp, skip+1)\n}<\/code><\/pre>\n<p>recv()\u65b9\u6cd5\u5148\u5224\u65adchan\u662f\u5426\u65e0\u7f13\u51b2\uff0c\u5982\u679c\u662f\uff0c\u5219\u76f4\u63a5\u4ece\u53d1\u9001\u8005sender\u90a3\u91cc\u62f7\u8d1d\u6570\u636e\uff0c\u5982\u679c\u6709\u7f13\u5b58\u533a\uff0c\u7531\u4e8e\u6709\u53d1\u9001\u8005\uff0c\u6b64\u65f6\u7f13\u51b2\u533a\u7684\u5faa\u73af\u961f\u5217\u4e00\u5b9a\u662f\u6ee1\u7684\uff0c\u4f1a\u5148\u4ece\u7f13\u51b2\u533a\u62f7\u8d1d\u6570\u636e\u7ed9\u63a5\u6536\u8005receiver\uff0c\u7136\u540e\u5c06\u53d1\u9001\u8005\u7684\u6570\u636e\u62f7\u8d1d\u5230\u7f13\u51b2\u533a\uff0c\u6ee1\u8db3FIFO\u3002\u6700\u540e\uff0c\u5524\u9192\u53d1\u9001\u8005\u7684goroutine\u3002<\/p>\n<p>6.\u63a5\u4e0b\u6765\uff0c\u662f\u5f02\u6b65\u63a5\u6536\u903b\u8f91\uff0c\u5982\u679c\u7f13\u51b2\u533a\u6709\u6570\u636e\uff0c\u76f4\u63a5\u4ece\u7f13\u51b2\u533a\u63a5\u6536\u6570\u636e\uff0c\u5373\u5c06\u7f13\u51b2\u533arecvx\u6307\u5411\u7684\u6570\u636e\u590d\u5236\u5230ep\u63a5\u6536\u5730\u5740\uff0c\u5e76\u4e14\u5c06recvx\u52a01\u3002<\/p>\n<pre><code>   ......\n         \/\/ \u5982\u679c\u7f13\u51b2\u533a\u6709\u6570\u636e\n         if c.qcount &gt; 0 {\n    \/\/ \u76f4\u63a5\u4ece\u7f13\u51b2\u533a\u63a5\u6536\u6570\u636e\n    qp := chanbuf(c, c.recvx)\n    if raceenabled {\n      racenotify(c, c.recvx, nil)\n    }\n                \/\/ \u63a5\u6536\u6570\u636e\u5730\u5740ep\u4e0d\u4e3a\u7a7a\uff0c\u76f4\u63a5\u4ece\u7f13\u51b2\u533a\u590d\u5236\u6570\u636e\u5230ep\n    if ep != nil {\n      typedmemmove(c.elemtype, ep, qp)\n    }\n    typedmemclr(c.elemtype, qp)\n                \/\/ \u5f85\u63a5\u6536\u7d22\u5f15\u52a01\n    c.recvx++\n                \/\/ \u5faa\u73af\u961f\u5217\uff0c\u5982\u679c\u5230\u4e86\u672b\u5c3e\uff0c\u4ece0\u5f00\u59cb\n    if c.recvx == c.dataqsiz {\n      c.recvx = 0\n    }\n                \/\/ \u7f13\u51b2\u533a\u6570\u636e\u51cf1\n    c.qcount--\n    unlock(&amp;c.lock)\n    return true, true\n  }\n        ......<\/code><\/pre>\n<p>7.\u7136\u540e\uff0c\u662f\u7f13\u51b2\u533a\u6ca1\u6709\u6570\u636e\u7684\u60c5\u51b5\uff1b\u5982\u679c\u662fselect\u8fd9\u79cd\u975e\u963b\u585e\u8bfb\u53d6\u7684\u60c5\u51b5\uff0c\u76f4\u63a5\u8fd4\u56de(false, false)\uff0c\u8868\u793a\u83b7\u53d6\u4e0d\u5230\u6570\u636e\uff1b\u5426\u5219\uff0c\u4f1a\u83b7\u53d6sudog\u7ed1\u5b9a\u5f53\u524d\u63a5\u6536\u8005goroutine\uff0c\u8c03\u7528gopark()\u6302\u8d77\u5f53\u524d\u63a5\u6536\u8005goroutine\uff0c\u7b49\u5f85chan\u7684\u5176\u4ed6\u53d1\u9001\u8005\u5524\u9192\u3002<\/p>\n<pre><code>        ......\n        \/\/ \u5982\u679c\u662fselect\u975e\u963b\u585e\u8bfb\u53d6\u7684\u60c5\u51b5\uff0c\u76f4\u63a5\u8fd4\u56de(false, false)\n        if !block {\n    unlock(&amp;c.lock)\n    return false, false\n  }\n\n  \/\/ \u6ca1\u6709\u53d1\u9001\u8005\uff0c\u6302\u8d77\u5f53\u524dgoroutine\n        \/\/ \u83b7\u53d6\u5f53\u524d goroutine \u7684\u6307\u9488\uff0c\u7528\u4e8e\u7ed1\u5b9a\u7ed9\u4e00\u4e2a sudog\n  gp := getg()\n        \/\/ \u8c03\u7528 acquireSudog() \u65b9\u6cd5\u83b7\u53d6\u4e00\u4e2a sudog\uff0c\u53ef\u80fd\u662f\u65b0\u5efa\u7684 sudog\uff0c\u4e5f\u6709\u53ef\u80fd\u662f\u4ece\u7f13\u5b58\u4e2d\u83b7\u53d6\u7684\u3002\u8bbe\u7f6e\u597d sudog \u8981\u53d1\u9001\u7684\u6570\u636e\u548c\u72b6\u6001\n  mysg := acquireSudog()\n  mysg.releasetime = 0\n  if t0 != 0 {\n    mysg.releasetime = -1\n  }\n\n  mysg.elem = ep\n  mysg.waitlink = nil\n  gp.waiting = mysg\n  mysg.g = gp\n  mysg.isSelect = false\n  mysg.c = c\n  gp.param = nil\n        \/\/ \u5c06\u914d\u7f6e\u597d\u7684 sudog \u52a0\u5165\u5f85\u53d1\u9001\u7684\u7b49\u5f85\u961f\u5217\n  c.recvq.enqueue(mysg)\n  atomic.Store8(&amp;gp.parkingOnChan, 1)\n        \/\/ \u6302\u8d77\u5f53\u524d goroutine\n  gopark(chanparkcommit, unsafe.Pointer(&amp;c.lock), waitReasonChanReceive, traceEvGoBlockRecv, 2)\n        ......<\/code><\/pre>\n<p>8.\u6700\u540e\uff0c\u5f53\u524dgoroutine\u88ab\u5524\u9192\uff0c\u5b8c\u6210chan\u6570\u636e\u7684\u63a5\u6536\uff0c\u4e4b\u540e\u8fdb\u884c\u53c2\u6570\u68c0\u67e5\uff0c\u89e3\u9664chan\u7ed1\u5b9a\uff0c\u5e76\u91ca\u653esudog\u3002<\/p>\n<pre><code>func chanrecv(c *hchan, ep unsafe.Pointer, block bool) (selected, received bool) {\n  ......\n        \/\/ \u5f53\u524dgoroutine\u88ab\u5524\u9192\uff0c\u5b8c\u6210chan\u6570\u636e\u7684\u63a5\u6536\uff0c\u4e4b\u540e\u8fdb\u884c\u53c2\u6570\u68c0\u67e5\uff0c\u89e3\u9664chan\u7ed1\u5b9a\uff0c\u5e76\u91ca\u653esudog\n  if mysg != gp.waiting {\n    throw(&quot;G waiting list is corrupted&quot;)\n  }\n  gp.waiting = nil\n  gp.activeStackChans = false\n  if mysg.releasetime &gt; 0 {\n    blockevent(mysg.releasetime-t0, 2)\n  }\n  success := mysg.success\n  gp.param = nil\n  mysg.c = nil\n  releaseSudog(mysg)\n  return true, success\n}<\/code><\/pre>\n<p>\u7efc\u4e0a\u5206\u6790\uff0c\u4ecechan\u63a5\u6536\u6570\u636e\u7684\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<p>1.\u4e5f\u662f\u5148\u5224\u65adselect\u8fd9\u79cd\u975e\u963b\u585e\u63a5\u6536\u7684\u4e24\u79cd\u60c5\u51b5\uff08block\u4e3afalse\uff09\uff1b\u7136\u540e\u662f\u52a0\u9501\u8fdb\u884c\u963b\u585e\u8c03\u7528\u7684\u903b\u8f91\uff1b<\/p>\n<p>2.\u540c\u6b65\u63a5\u6536\uff1a\u5982\u679c\u53d1\u9001\u8005\u961f\u5217sendq\u4e0d\u4e3a\u7a7a\uff0c\u4e14\u6ca1\u6709\u7f13\u5b58\u533a\uff0c\u76f4\u63a5\u4ecesendq\u4e2d\u53d6\u51fa\u4e00\u4e2agoroutine\uff0c\u8bfb\u53d6\u5f53\u524dgoroutine\u4e2d\u7684\u6d88\u606f\uff0c\u5524\u9192goroutine, \u7ed3\u675f\u8bfb\u53d6\u7684\u8fc7\u7a0b\uff1b<\/p>\n<p>3.\u540c\u6b65\u63a5\u6536\uff1a\u5982\u679c\u53d1\u9001\u8005\u961f\u5217sendq\u4e0d\u4e3a\u7a7a\uff0c\u8bf4\u660e\u7f13\u51b2\u533a\u5df2\u7ecf\u6ee1\u4e86\uff0c\u79fb\u52a8recvx\u6307\u9488\u7684\u4f4d\u7f6e\uff0c\u53d6\u51fa\u4e00\u4e2a\u6570\u636e\uff0c\u540c\u65f6\u5728sendq\u4e2d\u53d6\u51fa\u4e00\u4e2agoroutine\uff0c\u62f7\u8d1d\u91cc\u9762\u7684\u6570\u636e\u5230buf\u4e2d\uff0c\u7ed3\u675f\u5f53\u524d\u8bfb\u53d6\uff1b<\/p>\n<p>4.\u5f02\u6b65\u63a5\u6536\uff1a\u5982\u679c\u53d1\u9001\u8005\u961f\u5217sendq\u4e3a\u7a7a\uff0c\u4e14\u7f13\u51b2\u533a\u6709\u6570\u636e\uff0c\u76f4\u63a5\u5728\u7f13\u51b2\u533a\u53d6\u51fa\u6570\u636e\uff0c\u5b8c\u6210\u672c\u6b21\u8bfb\u53d6\uff1b<\/p>\n<p>5.\u963b\u585e\u63a5\u6536\uff1a\u5982\u679c\u53d1\u9001\u8005\u961f\u5217sendq\u4e3a\u7a7a\uff0c\u4e14\u7f13\u51b2\u533a\u6ca1\u6709\u6570\u636e\u3002\u5c06\u5f53\u524dgoroutine\u52a0\u5165recvq\uff0c\u8fdb\u5165\u7761\u7720\uff0c\u7b49\u5f85\u88ab\u53d1\u9001\u8005goroutine\u5524\u9192\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927712\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<h2><strong>\u5173\u95edChan<\/strong><\/h2>\n<p>\u5173\u95edchan\u7684\u4ee3\u7801\u662fclose(ch)\uff0c\u7f16\u8bd1\u5668\u4f1a\u5c06\u5176\u8f6c\u4e3a\u8c03\u7528 runtime.closechan() \u65b9\u6cd5\u3002<\/p>\n<pre><code>func closechan(c *hchan) {\n        \/\/ \u5982\u679cchan\u4e3a\u7a7a\uff0c\u6b64\u65f6\u5173\u95ed\u5b83\u4f1apanic\n  if c == nil {\n    panic(plainError(&quot;close of nil channel&quot;))\n  }\n\n        \/\/ \u52a0\u9501\n  lock(&amp;c.lock)\n        \/\/ \u5982\u679cchan\u5df2\u7ecf\u5173\u95ed\u4e86\uff0c\u518d\u6b21\u5173\u95ed\u5b83\u4f1apanic\n  if c.closed != 0 {\n    unlock(&amp;c.lock)\n    panic(plainError(&quot;close of closed channel&quot;))\n  }\n\n  if raceenabled {\n    callerpc := getcallerpc()\n    racewritepc(c.raceaddr(), callerpc, abi.FuncPCABIInternal(closechan))\n    racerelease(c.raceaddr())\n  }\n        \/\/ \u8bbe\u7f6echan\u7684closed\u72b6\u6001\u4e3a\u5173\u95ed\n  c.closed = 1\n        \/\/ \u7533\u660e\u4e00\u4e2a\u5b58\u653e\u6240\u6709\u63a5\u6536\u8005\u548c\u53d1\u9001\u8005goroutine\u7684list\n  var glist gList\n\n  \/\/\u83b7\u53d6recvq\u91cc\u7684\u6240\u6709\u63a5\u6536\u8005\n  for {\n    sg := c.recvq.dequeue()\n    if sg == nil {\n      break\n    }\n    if sg.elem != nil {\n      typedmemclr(c.elemtype, sg.elem)\n      sg.elem = nil\n    }\n    if sg.releasetime != 0 {\n      sg.releasetime = cputicks()\n    }\n    gp := sg.g\n    gp.param = unsafe.Pointer(sg)\n    sg.success = false\n    if raceenabled {\n      raceacquireg(gp, c.raceaddr())\n    }\n                \/\/ \u653e\u5165\u961f\u5217glist\u4e2d\n    glist.push(gp)\n  }\n\n  \/\/ \u83b7\u53d6\u6240\u6709\u53d1\u9001\u8005\n  for {\n    sg := c.sendq.dequeue()\n    if sg == nil {\n      break\n    }\n    sg.elem = nil\n    if sg.releasetime != 0 {\n      sg.releasetime = cputicks()\n    }\n    gp := sg.g\n    gp.param = unsafe.Pointer(sg)\n    sg.success = false\n    if raceenabled {\n      raceacquireg(gp, c.raceaddr())\n    }\n                \/\/ \u653e\u5165\u961f\u5217glist\u4e2d\n    glist.push(gp)\n  }\n  unlock(&amp;c.lock)\n\n  \/\/ \u5524\u9192\u6240\u6709\u7684glist\u4e2d\u7684goroutine \n  for !glist.empty() {\n    gp := glist.pop()\n    gp.schedlink = 0\n    goready(gp, 3)\n  }\n}<\/code><\/pre>\n<p>\u5173\u95edchan\u7684\u6b65\u9aa4\u662f\uff1a<\/p>\n<p>1.\u5148\u68c0\u67e5\u5f02\u5e38\u60c5\u51b5\uff0c\u5f53 Channel \u662f\u4e00\u4e2a nil \u7a7a\u6307\u9488\u6216\u8005\u5173\u95ed\u4e00\u4e2a\u5df2\u7ecf\u5173\u95ed\u7684 channel \u65f6\uff0cGo \u8bed\u8a00\u8fd0\u884c\u65f6\u90fd\u4f1a\u76f4\u63a5 panic\u3002<\/p>\n<p>2.\u5173\u95ed\u7684\u4e3b\u8981\u5de5\u4f5c\u662f\u91ca\u653e\u6240\u6709\u7684\u63a5\u6536\u8005\u548c\u53d1\u9001\u8005\uff1a\u5c06\u6240\u6709\u7684\u63a5\u6536\u8005 readers \u7684 sudog \u7b49\u5f85\u961f\u5217\uff08recvq\uff09\u52a0\u5165\u5230\u5f85\u6e05\u9664\u961f\u5217 glist \u4e2d\u3002\u6ce8\u610f\u8fd9\u91cc\u662f\u5148\u56de\u6536\u63a5\u6536\u8005\uff0c\u56e0\u4e3a\u4ece\u4e00\u4e2a\u5173\u95ed\u7684 channel \u4e2d\u8bfb\u6570\u636e\uff0c\u4e0d\u4f1a\u53d1\u751f panic\uff0c\u9876\u591a\u8bfb\u5230\u4e00\u4e2a\u9ed8\u8ba4\u96f6\u503c\u3002\u518d\u56de\u6536\u53d1\u9001\u8005 senders\uff0c\u5c06\u53d1\u9001\u8005\u7684\u7b49\u5f85\u961f\u5217 sendq \u4e2d\u7684 sudog \u653e\u5165\u5f85\u6e05\u9664\u961f\u5217 glist \u4e2d\u3002\u6ce8\u610f\u8fd9\u91cc\u53ef\u80fd\u4f1a\u4ea7\u751f panic\uff0c\u56e0\u4e3a\u5f80\u4e00\u4e2a\u5173\u95ed\u7684 channel \u4e2d\u53d1\u9001\u6570\u636e\uff0c\u4f1a\u4ea7\u751f panic\u3002<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927713\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><strong>\u603b\u7ed3<\/strong><\/p>\n<p>Channel\u662f\u57fa\u4e8e\u6709\u9501\u961f\u5217\u5b9e\u73b0\u6570\u636e\u5728\u4e0d\u540c\u534f\u7a0b\u4e4b\u95f4\u4f20\u8f93\u7684\u901a\u9053\uff0c\u6570\u636e\u4f20\u8f93\u7684\u65b9\u5f0f\u5176\u5b9e\u5c31\u662f\u503c\u4f20\u9012\uff0c\u5f15\u7528\u7c7b\u578b\u6570\u636e\u7684\u4f20\u9012\u662f\u5730\u5740\u62f7\u8d1d\u3002<\/p>\n<p>\u6709\u522b\u4e8e\u901a\u8fc7\u5171\u4eab\u5185\u5b58\u52a0\u9501\u7684\u65b9\u5f0f\u5728\u534f\u7a0b\u4e4b\u95f4\u4f20\u8f93\u6570\u636e\uff0c\u901a\u8fc7channel\u4f20\u9012\u6570\u636e\uff0c\u8fd9\u4e9b\u6570\u636e\u7684\u6240\u6709\u6743\u4e5f\u53ef\u4ee5\u5728goroutine\u4e4b\u95f4\u4f20\u8f93\u3002\u5f53 goroutine \u5411 channel \u53d1\u9001\u503c\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230 goroutine \u91ca\u653e\u4e86\u4e00\u4e9b\u503c\u7684\u6240\u6709\u6743\u3002\u5f53\u4e00\u4e2a goroutine \u4ece\u4e00\u4e2a channel \u63a5\u6536\u5230\u4e00\u4e2a\u503c\u65f6\uff0c\u53ef\u4ee5\u770b\u5230 goroutine \u83b7\u5f97\u4e86\u4e00\u4e9b\u503c\u7684\u6240\u6709\u6743\u3002<\/p>\n<p>channel\u5e38\u89c1\u7684\u8bfb\u5199\u5f02\u5e38\u60c5\u51b5\u5982\u4e0b\u8868\u6240\u793a\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc4hCb\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p><strong>\u817e\u8baf\u5de5\u7a0b\u5e08\u6280\u672f\u5e72\u8d27\u76f4\u8fbe\uff1a<\/strong><\/p>\n<ol>\n<li>\n<h2><a href=\"https:\/\/link.segmentfault.com\/?enc=2H5Yd1PZBcyLU63CHIWYHw%3D%3D.t12EuYfmNwlSgM8jJEJjqiGUKc2ijqa8uh%2BvzcGAdbFtOBzWIqxOhlBRcamBRjEI3GZFuuGBYGyU4iNCrvonkKQjxTOM1Od%2FEU7PuA39USEEmkySxX%2FakG2Kqo9skUAToOnwLnFgtcM9v9%2Bh3khBZfHoU8AfpFR71I5ZUrwMoWcgMt0z8zn21eCo6xaR3keLDZit7L3sDi%2BUUoOvITTgSJ5hF0H%2Fem1iPV%2Fah8%2FEWd4UEwJ%2FfgWxhlaqOo64BDuJWYXxklhwEZBECN5orAXvH5cnlfhxe72Q4NNUTMdQMLY%3D\" rel=\"nofollow\">\u5feb\u6536\u85cf\uff01\u6700\u5168GO\u8bed\u8a00\u5b9e\u73b0\u8bbe\u8ba1\u6a21\u5f0f\u3010\u4e0b\u3011<\/a><\/h2>\n<\/li>\n<li>\n<h2><a href=\"https:\/\/link.segmentfault.com\/?enc=fB49jV7MWhfQXKLfrtFuWg%3D%3D.T8pwjrLownBgCxVx1pnw1e1v6d4u5pfWLTwnj1JonyZ4bMcS%2Fc2gkmy8921tz%2BYfksdPb%2BVoGz%2Fgeb%2BTtVIKnoLTvpvuMtgfihVsob4otzayLbb5%2BB1smsmKaWyaA5VtoWNzrctwB30QBJGb8xKSSBnZdPPICiuk56NAbheKHthxqRheJxbTgj0m65z84mYzxhx8wfNh9jOSDnKIxtN1p9ARH4zryWv0g28h3mShdt4wvBOdTSgdMA5hu8RDTdRru3DTxueGsIzI3hWwsOvFBUT09vkhK1wXFOX1uAjOfbo%3D\" rel=\"nofollow\">\u5982\u4f55\u6210\u4e3a\u4f18\u79c0\u5de5\u7a0b\u5e08\u4e4b\u8f6f\u6280\u80fd\u7bc7<\/a><\/h2>\n<\/li>\n<li>\n<h2><a href=\"https:\/\/link.segmentfault.com\/?enc=qKS8SwEh4RJZUnfkeuvIIA%3D%3D.azHs310Z2L%2BCiEI2iCUUvyw51l5p%2FjLXo68YtvWgE8dkswAmAT8JdaP00Qo1bCLkiXsnmBHQrCxhZaoQYpcqvVhjxjDLzjEnSpEwhK8ld6jm3w7LXAaYD6ohvKuWj5BxpoJYvt8D7RsUHvGgOMDJncKpOf3QpGB3kWUHKsMfDmjhxd0zZHBs69r9cCyaH8q0PGkTHdOi6D8GsawGNlpTxAT5QNsEZ8CQz%2BnL89O5zp%2Fv2Y1RbXv7woClX9tN3caKN7gdp7F5HrpF9qu9K0qVHj%2FfRfP%2BFwYwl2m9GNdnCyE%3D\" rel=\"nofollow\">\u5982\u4f55\u66f4\u597d\u5730\u4f7f\u7528Kafka\uff1f<\/a><\/h2>\n<\/li>\n<li>\n<h2><a href=\"https:\/\/link.segmentfault.com\/?enc=fA5QFv26j%2B7ZUi2W6jb5Xg%3D%3D.agu%2BO0IJYxEhpLkL0HO0Kej844A%2FY6PtJ1G47tRVUHndcajkYQmJhzD%2FNMGsPaOL7mQFdJq2vdEtgqdZM8Jz0IM4lcHbrNjtVo%2FbTESmRNVGjni2CkY1133rv5ruiC%2BY09ivra7vztdC03TEB9Rexw%2FDgfKC4BzhwTo1SIE1I%2FsyiYeT1%2BWZUT91dabyCYLIDwSw8fChjsVKETDYjUKG4AKRL7V3SxDMX%2BIx6di1dNmcBiKasXYlwZmzBlRqwFmIb6EnvfOPc0tXyIfu%2BUHgZhbb72MXEa43DE0gr2XRrH4%3D\" rel=\"nofollow\">\u4e00\u6587\u5e26\u4f60\u6df1\u5165\u4e86\u89e3HTTP<\/a><\/h2>\n<\/li>\n<\/ol>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/remote\/1460000042927714\" alt=\"\u56fe\u7247\" title=\"\u56fe\u7247\" loading=\"lazy\"><\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042927699\">https:\/\/segmentfault.com\/a\/1190000042927699<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u662f\u57fa\u4e8eGo1.18.1\u6e90\u7801\u7684\u5b66\u4e60\u7b14\u8bb0\u3002Channel\u7684\u5e95\u5c42\u6e90\u7801\u4eceGo1.14\u5230\u73b0\u5728\u7684Go1.19\u4e4b\u95f4\u51e0\u4e4e\u6ca1 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10006937","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006937","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006937"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006937\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006937"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006937"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006937"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}