{"id":207095,"date":"2025-07-08T10:13:29","date_gmt":"2025-07-08T02:13:29","guid":{"rendered":"https:\/\/server.hk\/cnblog\/207095\/"},"modified":"2025-07-08T10:13:29","modified_gmt":"2025-07-08T02:13:29","slug":"%e4%bb%85%e4%bb%8e-go-%e4%be%8b%e7%a8%8b%e4%b8%ad%e7%9a%84-println-%e6%8e%a5%e6%94%b6%e9%80%9a%e9%81%93%e4%bc%9a%e5%bc%95%e5%8f%91%e6%ad%bb%e9%94%81%e5%bc%82%e5%b8%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/207095\/","title":{"rendered":"\u4ec5\u4ece go \u4f8b\u7a0b\u4e2d\u7684 Println \u63a5\u6536\u901a\u9053\u4f1a\u5f15\u53d1\u6b7b\u9501\u5f02\u5e38"},"content":{"rendered":"

<\/b> <\/p>\n

\u5f53\u524d\u4f4d\u7f6e\uff1a ><\/span> ><\/span> ><\/span> ><\/span> \u4ec5\u4ece go \u4f8b\u7a0b\u4e2d\u7684 Println \u63a5\u6536\u901a\u9053\u4f1a\u5f15\u53d1\u6b7b\u9501\u5f02\u5e38<\/span><\/p>\n

\u6765\u6e90\uff1astackoverflow<\/span>
\n2024-04-19 23:30:35<\/span>
\n<\/i>0\u6d4f\u89c8<\/span>
\n<\/i>\u6536\u85cf<\/span> <\/p>\n

\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9Golang<\/span>\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecdGolang<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587\u300a\u4ec5\u4ece go \u4f8b\u7a0b\u4e2d\u7684 Println \u63a5\u6536\u901a\u9053\u4f1a\u5f15\u53d1\u6b7b\u9501\u5f02\u5e38\u300b<\/span>\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n

\u95ee\u9898\u5185\u5bb9
\n <\/p>\n

\u6211\u6709\u4e00\u4e9b\u4ee3\u7801\uff0c\u6211\u8bd5\u56fe\u4f7f\u7528 fmt.println \u6253\u5370 goroutine \u4e2d\u901a\u9053\u7684\u5185\u5bb9\u3002\u8fd9\u662f\u4ee3\u7801\u7684\u7b80\u5316\u7248\u672c\u3002<\/p>\n

package main\n\nimport \"fmt\"\nimport \"time\"\n\nfunc main() {\n  ch := make(chan int)\n  go fmt.println(<-ch);\n  ch<- 10;\n  time.sleep(time.second * 10);\n}<\/pre>\n
\u5f53\u6211\u8fd0\u884c\u4e0a\u9762\u7684\u4ee3\u7801\u65f6\uff0c\u6211\u6536\u5230\u6b64\u9519\u8bef\u3002<\/p>\n
fatal error: all goroutines are asleep - deadlock!\n\ngoroutine 1 [chan receive]:\nmain.main()\n        c:\/cygwin64\/home\/vmadhusudana\/go\/channel.go:9 +0x67\nexit status 2<\/pre>\n
\u4f46\u662f\u5f53\u6211\u4ece\u51fd\u6570\u8c03\u7528 fmt.println \u65f6\u5b83\u5de5\u4f5c\u6b63\u5e38<\/p>\n
package main\n\nimport \"fmt\"\nimport \"time\"\n\nfunc main() {\n    ch := make(chan int)\n    go func(){fmt.Println(<-ch)}();\n    ch<- 10;\n    time.Sleep(time.Second * 10);\n}<\/pre>\n
\u8fd9\u91cc\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f<\/p>\n
 <\/p>\n
\u89e3\u51b3\u65b9\u6848<\/h2>\n
 <\/p>\n
\u5728\u7b2c\u4e00\u4e2a\u7248\u672c\u4e2d\uff0c\u901a\u9053\u8bfb\u53d6\u662f\u4ece\u4e3b go \u4f8b\u7a0b\u6267\u884c\u7684 – \u56e0\u6b64\u51fa\u73b0\u4e86\u6b7b\u9501\u3002 \u7b2c\u4e8c\u4e2a\u7248\u672c\uff0c\u8bfb\u53d6\u662f\u4ece\u521b\u5efa\u7684 go-routine \u4e2d\u5b8c\u6210\u7684\u3002<\/p>\n
\u57fa\u672c\u4e0a\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n
go fmt.println(<-ch);<\/pre>\n
\u53d8\u6210\uff1a<\/p>\n
v := <-ch\ngo fmt.println(v);<\/pre>\n
\u7531\u4e8e\u51fd\u6570\u7684\u53c2\u6570\u5728\u8c03\u7528\u4e4b\u524d\u8fdb\u884c\u8bc4\u4f30\u3002<\/p>\n
\u9644\u6ce8defer \u8bed\u53e5\u7684\u884c\u4e3a\u7c7b\u4f3c\u3002\u56e0\u6b64\uff0c\u5982\u679c\u60a8\u5e0c\u671b\u4f20\u9012\u7ed9 go-routine \u6216 defer \u8bed\u53e5\u7684\u503c\u5728\u201c\u8fd0\u884c\u65f6\u201d\u8fdb\u884c\u8ba1\u7b97\uff0c\u8bf7\u59cb\u7ec8\u4f7f\u7528\u95ed\u5305\u3002<\/p>\n
\/\/ receive the value from channel firstly\n\/\/ then create new goroutine to println\ngo fmt.Println(<-ch)\n\n\/\/ receive channel in new goroutine \ngo func(){fmt.Println(<-ch)}()<\/pre>\n<\/p>\n
\u8fd9\u5c06\u5e2e\u52a9\u60a8\u7406\u89e3 exec \u7684\u987a\u5e8f\u3002<\/p>\n
\u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u4ec5\u4ece go \u4f8b\u7a0b\u4e2d\u7684 Println \u63a5\u6536\u901a\u9053\u4f1a\u5f15\u53d1\u6b7b\u9501\u5f02\u5e38\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5f53\u524d\u4f4d\u7f6e\uff1a > > ...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-207095","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207095","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=207095"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/207095\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=207095"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=207095"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=207095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}