{"id":221145,"date":"2020-11-24T22:58:41","date_gmt":"2020-11-24T14:58:41","guid":{"rendered":"http:\/\/4563.org\/?p=221145"},"modified":"2020-11-24T22:58:41","modified_gmt":"2020-11-24T14:58:41","slug":"go-%e5%8d%8f%e7%a8%8b%e5%92%8c-select-%e7%9a%84%e7%9f%a5%e8%af%86%e7%82%b9","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=221145","title":{"rendered":"go \u534f\u7a0b\u548c select \u7684\u77e5\u8bc6\u70b9"},"content":{"rendered":"<div>\n<div>\n<div>\n<h1>                  go \u534f\u7a0b\u548c select \u7684\u77e5\u8bc6\u70b9               <\/h1>\n<p> <\/p>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : xing393939 <\/span>  <span><i><\/i> 4<\/span> <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<div isfirst=\"1\"> <\/p>\n<h3>\u65e0\u7f13\u5b58\u7ba1\u9053\u548c\u7f13\u5b58\u7ba1\u9053<\/h3>\n<p>\u5148\u770b\u770b\u65e0\u7f13\u5b58\u7ba1\u9053\u7684\u4f8b\u5b50\uff1a<\/p>\n<pre><code> a := make(chan bool)  go func() {   log.Println(\"goroutine\")   &lt;-a  }()  a &lt;- true <\/code><\/pre>\n<p>\u8fd9\u91cc\u4e3b\u534f\u7a0b\u4f1a\u7b49\u5f85\u5b50\u534f\u7a0b\u6267\u884c\u5b8c\uff0c\u4f46\u662f\u5982\u679c\u628a\u7b2c\u4e00\u884c\u6539\u6210 a := make(chan bool, 1)\uff0c\u90a3\u4e48\u4e3b\u534f\u7a0b\u5199\u5b8c\u6d88\u606f\u76f4\u63a5\u9000\u51fa\u4e86\uff0c\u5b50\u534f\u7a0b\u6ca1\u6709\u673a\u4f1a\u6267\u884c\uff08\u53ea\u6709\u4e00\u4e2a cpu \u65f6\uff09\u3002\u4f46\u662f\u6539\u6210\u5982\u4e0b\u5b50\u534f\u7a0b\u53c8\u53ef\u4ee5\u6267\u884c\u4e86\uff1a<\/p>\n<pre><code> a := make(chan bool, 1)  go func() {   log.Println(\"goroutine\")   &lt;-a  }()  a &lt;- true  a &lt;- true <\/code><\/pre>\n<h3>\u7ba1\u9053\u5173\u95ed\u540e\uff0cselect \u80fd\u4e00\u76f4\u63a5\u53d7 close \u4fe1\u53f7<\/h3>\n<pre><code> a := make(chan bool, 1)  go func() {   close(a)  }()  for {   select {   case _, ok := &lt;-a:    log.Println(ok)   }  } <\/code><\/pre>\n<p>\u800c\u7528 for range \u662f\u4e0d\u80fd\u83b7\u53d6 close \u4fe1\u53f7\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n<pre><code> a := make(chan bool, 1)  go func() {   a &lt;- true   close(a)  }()  for {   for v := range a {    log.Println(v)   }  }  <\/code><\/pre>\n<\/p><\/div>\n<div> <b>\u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (<span>1<\/span>)        <\/div>\n<div> <\/div>\n<\/p><\/div>\n<\/p><\/div>\n<ul>\n<li data-pid=\"4460120\" data-uid=\"2\">\n<div>\n<div>\n<div> <span>\u8cc7\u6df1\u5927\u4f6c : user8341 <\/span>  <\/div>\n<div> <i title=\"\u5f15\u7528\"><\/i>  <span>          <\/span> <\/div>\n<\/p><\/div>\n<div>                                                             range \u662f\u5faa\u73af\u5230 chan \u88ab\u5173\u95ed\u4e3a\u6b62\u3002\u5f53\u7136\u5982\u679c\u4e00\u5f00\u59cb\u5c31\u662f\u5173\u95ed\u7684\uff0c\u5faa\u73af\u5c31\u4e0d\u6267\u884c\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n<li>\n","protected":false},"excerpt":{"rendered":"<p>go \u534f\u7a0b\u548c select \u7684\u77e5\u8bc6&hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/221145"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=221145"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/221145\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=221145"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=221145"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=221145"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}