{"id":3515,"date":"2017-08-12T07:52:01","date_gmt":"2017-08-11T23:52:01","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=3515"},"modified":"2017-08-12T07:52:01","modified_gmt":"2017-08-11T23:52:01","slug":"linux%e4%b8%8bepoll%e7%9a%84%e8%be%b9%e7%bc%98%e5%87%ba%e5%8f%91%e3%80%81%e6%b0%b4%e5%b9%b3%e8%a7%a6%e5%8f%91","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/3515.html","title":{"rendered":"Linux\u4e0bepoll\u7684\u8fb9\u7f18\u51fa\u53d1\u3001\u6c34\u5e73\u89e6\u53d1"},"content":{"rendered":"<p>=Start=<\/p>\n<h4 id=\"Linux\u4e0bepoll\u7684\u8fb9\u7f18\u51fa\u53d1\u3001\u6c34\u5e73\u89e6\u53d1-\u7f18\u7531\uff1a\">\u7f18\u7531\uff1a<\/h4>\n<p>\u5b66\u4e60\u3001\u63d0\u9ad8\u9700\u8981<\/p>\n<h4 id=\"Linux\u4e0bepoll\u7684\u8fb9\u7f18\u51fa\u53d1\u3001\u6c34\u5e73\u89e6\u53d1-\u6b63\u6587\uff1a\">\u6b63\u6587\uff1a<\/h4>\n<h5 id=\"Linux\u4e0bepoll\u7684\u8fb9\u7f18\u51fa\u53d1\u3001\u6c34\u5e73\u89e6\u53d1-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n<p><span style=\"color: #ff0000;\"><strong>Level_triggered(\u6c34\u5e73\u89e6\u53d1)<\/strong><\/span>\uff1a\u5f53\u88ab\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u6709\u53ef\u8bfb\u5199\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0cepoll_wait()\u4f1a\u901a\u77e5\u5904\u7406\u7a0b\u5e8f\u53bb\u8bfb\u5199\u3002\u5982\u679c\u8fd9\u6b21\u6ca1\u6709\u628a\u6570\u636e\u4e00\u6b21\u6027\u5168\u90e8\u8bfb\u5199\u5b8c(\u5982\u8bfb\u5199\u7f13\u51b2\u533a\u592a\u5c0f)\uff0c\u90a3\u4e48\u4e0b\u6b21\u8c03\u7528 epoll_wait()\u65f6\uff0c\u5b83\u8fd8\u4f1a\u901a\u77e5\u4f60\u5728\u4e0a\u6ca1\u8bfb\u5199\u5b8c\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u7ee7\u7eed\u8bfb\u5199\uff0c\u5f53\u7136\u5982\u679c\u4f60\u4e00\u76f4\u4e0d\u53bb\u8bfb\u5199\uff0c<span style=\"color: #ff0000;\"><strong>\u5b83\u4f1a\u4e00\u76f4\u901a\u77e5\u4f60\uff01<\/strong><\/span>\uff01\uff01\u5982\u679c\u7cfb\u7edf\u4e2d\u6709\u5927\u91cf\u4f60\u4e0d\u9700\u8981\u8bfb\u5199\u7684\u5c31\u7eea\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u800c\u5b83\u4eec\u6bcf\u6b21\u90fd\u4f1a\u8fd4\u56de\uff0c\u8fd9\u6837\u4f1a\u5927\u5927\u964d\u4f4e\u5904\u7406\u7a0b\u5e8f\u68c0\u7d22\u81ea\u5df1\u5173\u5fc3\u7684\u5c31\u7eea\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6548\u7387\uff01\uff01\uff01<\/p>\n<p><span style=\"color: #0000ff;\"><strong>Edge_triggered(\u8fb9\u7f18\u89e6\u53d1)<\/strong><\/span>\uff1a\u5f53\u88ab\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u6709\u53ef\u8bfb\u5199\u4e8b\u4ef6\u53d1\u751f\u65f6\uff0cepoll_wait()\u4f1a\u901a\u77e5\u5904\u7406\u7a0b\u5e8f\u53bb\u8bfb\u5199\u3002\u5982\u679c\u8fd9\u6b21\u6ca1\u6709\u628a\u6570\u636e\u5168\u90e8\u8bfb\u5199\u5b8c(\u5982\u8bfb\u5199\u7f13\u51b2\u533a\u592a\u5c0f)\uff0c\u90a3\u4e48\u4e0b\u6b21\u8c03\u7528epoll_wait()\u65f6\uff0c\u5b83\u4e0d\u4f1a\u901a\u77e5\u4f60\uff0c\u4e5f\u5c31\u662f<span style=\"color: #0000ff;\"><strong>\u5b83\u53ea\u4f1a\u901a\u77e5\u4f60\u4e00\u6b21<\/strong><\/span>\uff0c\u76f4\u5230\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u51fa\u73b0\u7b2c\u4e8c\u6b21\u53ef\u8bfb\u5199\u4e8b\u4ef6\u624d\u4f1a\u901a\u77e5\u4f60\uff01\uff01\uff01\u8fd9\u79cd\u6a21\u5f0f\u6bd4\u6c34\u5e73\u89e6\u53d1\u6548\u7387\u9ad8\uff0c\u7cfb\u7edf\u4e0d\u4f1a\u5145\u65a5\u5927\u91cf\u4f60\u4e0d\u5173\u5fc3\u7684\u5c31\u7eea\u6587\u4ef6\u63cf\u8ff0\u7b26\uff01\uff01\uff01<\/p>\n<p><strong>\u963b\u585eIO<\/strong>\uff1a\u5f53\u4f60\u53bb\u8bfb\u4e00\u4e2a\u963b\u585e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u65f6\uff0c\u5982\u679c\u5728\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u6ca1\u6709\u6570\u636e\u53ef\u8bfb\uff0c\u90a3\u4e48<strong>\u5b83\u4f1a\u4e00\u76f4\u963b\u585e(\u901a\u4fd7\u4e00\u70b9\u5c31\u662f\u4e00\u76f4\u5361\u5728\u8c03\u7528\u51fd\u6570\u90a3\u91cc)<\/strong>\uff0c\u76f4\u5230\u6709\u6570\u636e\u53ef\u8bfb\u3002\u5f53\u4f60\u53bb\u5199\u4e00\u4e2a\u963b\u585e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u65f6\uff0c\u5982\u679c\u5728\u8be5\u6587\u4ef6\u63cf\u8ff0\u7b26\u4e0a\u6ca1\u6709\u7a7a\u95f4(\u901a\u5e38\u662f\u7f13\u51b2\u533a)\u53ef\u5199\uff0c\u90a3\u4e48\u5b83\u4f1a\u4e00\u76f4\u963b\u585e\uff0c\u76f4\u5230\u6709\u7a7a\u95f4\u53ef\u5199\u3002\u4ee5\u4e0a\u7684\u8bfb\u548c\u5199\u6211\u4eec\u7edf\u4e00\u6307\u5728\u67d0\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fdb\u884c\u7684\u64cd\u4f5c\uff0c\u4e0d\u5355\u5355\u6307\u771f\u6b63\u7684\u8bfb\u6570\u636e\uff0c\u5199\u6570\u636e\uff0c\u8fd8\u5305\u62ec\u63a5\u6536\u8fde\u63a5accept()\uff0c\u53d1\u8d77\u8fde\u63a5connect()\u7b49\u64cd\u4f5c&#8230;<\/p>\n<p><span style=\"color: #ff0000;\"><strong>\u975e\u963b\u585eIO<\/strong><\/span>\uff1a\u5f53\u4f60\u53bb\u8bfb\u5199\u4e00\u4e2a\u975e\u963b\u585e\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u65f6\uff0c\u4e0d\u7ba1\u53ef\u4e0d\u53ef\u4ee5\u8bfb\u5199\uff0c<span style=\"color: #ff0000;\"><strong>\u5b83\u90fd\u4f1a\u7acb\u5373\u8fd4\u56de<\/strong><\/span>\uff0c\u8fd4\u56de\u6210\u529f\u8bf4\u660e\u8bfb\u5199\u64cd\u4f5c\u5b8c\u6210\u4e86\uff0c\u8fd4\u56de\u5931\u8d25\u4f1a\u8bbe\u7f6e\u76f8\u5e94errno\u72b6\u6001\u7801\uff0c\u6839\u636e\u8fd9\u4e2aerrno\u53ef\u4ee5\u8fdb\u4e00\u6b65\u6267\u884c\u5176\u4ed6\u5904\u7406\u3002\u5b83\u4e0d\u4f1a\u50cf\u963b\u585eIO\u90a3\u6837\uff0c\u5361\u5728\u90a3\u91cc\u4e0d\u52a8\uff01\uff01\uff01<\/p>\n<hr \/>\n<p><span style=\"color: #ff0000;\"><strong>select()\/poll()\u6a21\u578b\u90fd\u662f\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f<\/strong><\/span>\uff0c<span style=\"color: #0000ff;\"><strong>\u4fe1\u53f7\u9a71\u52a8I\/O\u662f\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f<\/strong><\/span>\uff0c<strong>epoll()\u6a21\u578b\u65e2\u652f\u6301\u6c34\u5e73\u89e6\u53d1\uff0c\u4e5f\u652f\u6301\u8fb9\u7f18\u89e6\u53d1\uff0c\u9ed8\u8ba4\u662f\u6c34\u5e73\u89e6\u53d1<\/strong>\u3002<\/p>\n<hr \/>\n<p><strong>\u522b\u4eba\u7684\u4e00\u4e9b\u603b\u7ed3\uff1a<\/strong><\/p>\n<ol>\n<li>\u5bf9\u4e8e\u76d1\u542c\u7684sockfd\uff0c\u6700\u597d\u4f7f\u7528\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f\uff0c\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\u4f1a\u5bfc\u81f4\u9ad8\u5e76\u53d1\u60c5\u51b5\u4e0b\uff0c\u6709\u7684\u5ba2\u6237\u7aef\u4f1a\u8fde\u63a5\u4e0d\u4e0a\u3002\u5982\u679c\u975e\u8981\u4f7f\u7528\u8fb9\u7f18\u89e6\u53d1\uff0c\u7f51\u4e0a\u6709\u7684\u65b9\u6848\u662f\u7528while\u6765\u5faa\u73afaccept()\u3002<\/li>\n<li>\u5bf9\u4e8e\u8bfb\u5199\u7684connfd\uff0c\u6c34\u5e73\u89e6\u53d1\u6a21\u5f0f\u4e0b\uff0c\u963b\u585e\u548c\u975e\u963b\u585e\u6548\u679c\u90fd\u4e00\u6837\uff0c\u4e0d\u8fc7\u4e3a\u4e86\u9632\u6b62\u7279\u6b8a\u60c5\u51b5\uff0c\u8fd8\u662f\u5efa\u8bae\u8bbe\u7f6e\u975e\u963b\u585e\u3002<\/li>\n<li>\u5bf9\u4e8e\u8bfb\u5199\u7684connfd\uff0c\u8fb9\u7f18\u89e6\u53d1\u6a21\u5f0f\u4e0b\uff0c\u5fc5\u987b\u4f7f\u7528\u975e\u963b\u585eIO\uff0c\u5e76\u8981\u4e00\u6b21\u6027\u5168\u90e8\u8bfb\u5199\u5b8c\u6570\u636e\u3002<\/li>\n<\/ol>\n<p>\u5728LT\uff08\u6c34\u5e73\u89e6\u53d1\uff09\u6a21\u5f0f\u4e0b\uff0c\u53ea\u8981\u8fd9\u4e2afd\u8fd8\u6709\u6570\u636e\u53ef\u8bfb\uff0c\u6bcf\u6b21 epoll_wait \u90fd\u4f1a\u8fd4\u56de\u5b83\u7684\u4e8b\u4ef6\uff0c\u63d0\u9192\u7528\u6237\u7a0b\u5e8f\u53bb\u64cd\u4f5c\uff0c\u800c\u5728ET\uff08\u8fb9\u7f18\u89e6\u53d1\uff09\u6a21\u5f0f\u4e2d\uff0c\u5b83\u53ea\u4f1a\u63d0\u793a\u4e00\u6b21\uff0c\u76f4\u5230\u4e0b\u6b21\u518d\u6709\u6570\u636e\u6d41\u5165\u4e4b\u524d\u90fd\u4e0d\u4f1a\u6709\u63d0\u793a\u4e86\uff0c\u65e0\u8bbafd\u4e2d\u662f\u5426\u8fd8\u6709\u6570\u636e\u53ef\u8bfb\u3002\u6240\u4ee5\u5728ET\u6a21\u5f0f\u4e0b\uff0c\u8bfb\/\u5199\u4e00\u4e2afd\u7684\u65f6\u5019\u4e00\u5b9a\u8981\u628a\u5b83\u7684buffer\u8bfb\/\u5199\u5149\uff0c\u4e5f\u5c31\u662f\u8bf4\u4e00\u76f4\u8bfb\/\u5199\u5230read\/write\u7684\u8fd4\u56de\u503c\u5c0f\u4e8e\u8bf7\u6c42\u503c\uff0c\u6216\u8005\u9047\u5230EAGAIN\u9519\u8bef\u3002<\/p>\n<h5 id=\"Linux\u4e0bepoll\u7684\u8fb9\u7f18\u51fa\u53d1\u3001\u6c34\u5e73\u89e6\u53d1-\u53c2\u8003\u94fe\u63a5\uff1a\">\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n<p>\u5b9e\u4f8b\u6d45\u6790epoll\u7684\u6c34\u5e73\u89e6\u53d1\u548c\u8fb9\u7f18\u89e6\u53d1\uff0c\u4ee5\u53ca\u8fb9\u7f18\u89e6\u53d1\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u975e\u963b\u585eIO #<span style=\"color: #ff0000;\"><strong>\u4ee3\u7801+\u5b9e\u4f8b<\/strong><\/span><br \/>\n<a class=\"external-link\" href=\"http:\/\/www.cnblogs.com\/yuuyuu\/p\/5103744.html\" rel=\"nofollow\">http:\/\/www.cnblogs.com\/yuuyuu\/p\/5103744.html<\/a><\/p>\n<p>\u81ea\u5df1\u8d9f\u8fc7epoll\u7684\u5751<br \/>\n<a class=\"external-link\" href=\"http:\/\/youbingchenyoubing.leanote.com\/post\/%E8%87%AA%E5%B7%B1%E8%B6%9F%E8%BF%87epoll%E7%9A%84%E5%9D%91\" rel=\"nofollow\">http:\/\/youbingchenyoubing.leanote.com\/post\/%E8%87%AA%E5%B7%B1%E8%B6%9F%E8%BF%87epoll%E7%9A%84%E5%9D%91<\/a><\/p>\n<p>Linux IO\u6a21\u5f0f\u53ca select\u3001poll\u3001epoll\u8be6\u89e3<br \/>\n<a class=\"external-link\" href=\"https:\/\/segmentfault.com\/a\/1190000003063859\" rel=\"nofollow\">https:\/\/segmentfault.com\/a\/1190000003063859<\/a><\/p>\n<p>epoll\u7684ET\u548cLT\u89e6\u53d1\u65b9\u5f0f<br \/>\n<a class=\"external-link\" href=\"https:\/\/jeff-linux.gitbooks.io\/muduo-\/chapter2.html\" rel=\"nofollow\">https:\/\/jeff-linux.gitbooks.io\/muduo-\/chapter2.html<\/a><\/p>\n<p>epoll\u6a21\u578bET\u548cLT<br \/>\n<a class=\"external-link\" href=\"http:\/\/www.firefoxbug.com\/index.php\/archives\/1942\/\" rel=\"nofollow\">http:\/\/www.firefoxbug.com\/index.php\/archives\/1942\/<\/a><\/p>\n<p>Epoll\u7684 \u6c34\u5e73\u89e6\u53d1\u548c\u8fb9\u7f18\u89e6\u53d1<br \/>\n<a class=\"external-link\" href=\"http:\/\/www.cleey.com\/blog\/single\/id\/791.html\" rel=\"nofollow\">http:\/\/www.cleey.com\/blog\/single\/id\/791.html<\/a><\/p>\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u5b66\u4e60\u3001\u63d0\u9ad8\u9700\u8981 \u6b63\u6587\uff1a \u53c2\u8003\u89e3\u7b54\uff1a Level_triggered(\u6c34\u5e73\u89e6\u53d1)\uff1a\u5f53\u88ab\u76d1 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7],"tags":[100,906,907,30],"class_list":["post-3515","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","tag-c","tag-epoll","tag-epollet","tag-linux"],"views":4715,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3515","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=3515"}],"version-history":[{"count":1,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3515\/revisions"}],"predecessor-version":[{"id":3516,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/3515\/revisions\/3516"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=3515"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=3515"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=3515"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}