{"id":413,"date":"2016-08-22T14:14:50","date_gmt":"2016-08-22T06:14:50","guid":{"rendered":"http:\/\/www.5x44.cn\/?p=413"},"modified":"2016-08-22T14:14:50","modified_gmt":"2016-08-22T06:14:50","slug":"%e7%ab%9e%e4%ba%89%e6%9d%a1%e4%bb%b6","status":"publish","type":"post","link":"https:\/\/www.5x44.cn\/?p=413","title":{"rendered":"\u7ade\u4e89\u6761\u4ef6"},"content":{"rendered":"<p>\u7ade\u4e89\u6761\u4ef6\u53d1\u751f\u5728\u591a\u4e2a\u8fdb\u7a0b\u5c1d\u8bd5\u4f7f\u7528\u5171\u4eab\u6570\u636e\uff0c\u5e76\u4e14\u5b83\u7684\u7ed3\u679c\u662f\u4f9d\u8d56\u4e8e\u8fdb\u7a0b\u8fd0\u884c\u7684\u987a\u5e8f\u3002\u56e0\u4e3a\u65e0\u8bba\u662f\u663e\u793a\u8fd8\u662f\u9690\u5f0f\u8c03\u7528<span style=\"color: #993300;\">fork<\/span>\u51fd\u6570\u903b\u8f91\u4e4b\u540e\u90fd\u65e0\u6cd5\u786e\u5b9a\u5148\u8fd0\u884c\u7236\u8fdb\u7a0b\u8fd8\u662f\u5b50\u8fdb\u7a0b\uff0c\u6240\u4ee5\u5728\u4f7f\u7528<span style=\"color: #993300;\">fork<\/span>\u51fd\u6570\u7684\u5730\u65b9\u7ecf\u5e38\u53d1\u751f\u7ade\u4e89\u6761\u4ef6\u3002\u5373\u4f7f\u77e5\u9053\u54ea\u4e2a\u8fdb\u7a0b\u5148\u8fd0\u884c\uff0c\u8fd9\u4e5f\u662f\u4f9d\u8d56\u4e8e\u7cfb\u7edf\u52a0\u8f7d\u548c\u5185\u6838\u7684\u8c03\u5ea6\u7b97\u6cd5\u3002\u5373\u4f7f\u662f\u4f7f\u7528\u4e86<span style=\"color: #993300;\">sleep<\/span>\u51fd\u6570\u4e5f\u65e0\u6cd5\u4fdd\u8bc1\u7236\u3001\u5b50\u8fdb\u7a0b\u54ea\u4e2a\u9009\u8fd0\u884c\uff0c\u56e0\u4e3a\u5f53\u7cfb\u7edf\u8d1f\u8f7d\u5f88\u91cd\u7684\u65f6\u5019\uff0c\u8fdb\u7a0b\u53ef\u80fd\u5ffd\u7565<span style=\"color: #993300;\">sleep<\/span>\u51fd\u6570\u3002\u8fd9\u5f88\u96beDEBUG\uff0c\u56e0\u4e3a\u8fdb\u7a0b\u90fd\u8d8b\u4e8e\u201c\u66f4\u591a\u65f6\u95f4\u201d\u7684\u8fd0\u884c\u3002<\/p>\n<p>\u4e00\u4e2a\u8fdb\u7a0b\u60f3\u63a5\u6536\u5b83\u7684\u5b50\u8fdb\u7a0b\u7ed3\u675f\u4fe1\u606f\uff0c\u5c31\u5fc5\u987b\u8c03\u7528<span style=\"color: #993300;\">wait<\/span>\u51fd\u6570\u7684\u4e00\u4e2a\u7248\u672c\u3002\u4e00\u4e2a\u8fdb\u7a0b\u60f3\u7b49\u5f85\u5b83\u7684\u7236\u8fdb\u7a0b\u7ed3\u675f\u4fe1\u606f\uff0c\u53ef\u80fd\u8981\u8c03\u7528\u4e0b\u9762\u5faa\u73af\u7684\u5f62\u5f0f\uff1a<\/p>\n<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\">\n<pre><span style=\"color: #993300;\">   while (getppid() != 1)\r\n      sleep(1);\r\n<\/span><\/pre>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u7c7b\u5faa\u73af\u88ab\u79f0\u4f5c<em>polling<\/em>\uff0c\u5b83\u5f88\u8d39CPU\u65f6\u95f4\uff0c\u56e0\u4e3a\u6bcf\u79d2\u90fd\u8981\u6d4b\u8bd5\u4e00\u6b21\u6761\u4ef6\u3002<\/p>\n<p>\u4e3a\u4e86\u907f\u514d\u7ade\u4e89\u6761\u4ef6\u548cpolling\uff0c\u5728\u591a\u4e2a\u8fdb\u7a0b\u95f4\u9700\u8981\u67d0\u79cd\u5f62\u5f0f\u7684\u4fe1\u53f7\u3002<\/p>\n<p><span style=\"text-decoration: underline;\">\u672c\u8282\u91cd\u70b9<\/span>\uff1a\u907f\u514d\u7ade\u4e89\u6761\u4ef6\u51fa\u73b0\uff0c\u5b83\u4f1a\u4f7f\u7a0b\u5e8f\u7684\u8fd0\u884c\u7ed3\u679c\u4e0d\u7a33\u5b9a\uff0c\u56e0\u4e3a<span style=\"color: #993300;\">\u7ade\u4e89\u6761\u4ef6\u662f\u4f9d\u8d56\u4e8e\u7cfb\u7edf\u52a0\u8f7d\u548c\u5185\u6838\u7684\u8c03\u5ea6\u7b97\u6cd5\u7684<\/span>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ade\u4e89\u6761\u4ef6\u53d1\u751f\u5728\u591a\u4e2a\u8fdb\u7a0b\u5c1d\u8bd5\u4f7f\u7528\u5171\u4eab\u6570\u636e\uff0c\u5e76\u4e14\u5b83\u7684\u7ed3\u679c\u662f\u4f9d\u8d56\u4e8e\u8fdb\u7a0b\u8fd0\u884c\u7684\u987a\u5e8f\u3002\u56e0\u4e3a\u65e0\u8bba\u662f\u663e\u793a\u8fd8\u662f\u9690\u5f0f\u8c03\u7528fork\u51fd\u6570\u903b\u8f91\u4e4b\u540e\u90fd\u65e0\u6cd5\u786e\u5b9a\u5148\u8fd0\u884c\u7236\u8fdb\u7a0b\u8fd8\u662f\u5b50\u8fdb\u7a0b\uff0c\u6240\u4ee5&#8230;<\/p>\n<p class=\"read-more\"><a class=\"btn btn-default\" href=\"https:\/\/www.5x44.cn\/?p=413\"> Read More<span class=\"screen-reader-text\">  Read More<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-413","post","type-post","status-publish","format-standard","hentry","category-apue"],"_links":{"self":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/413","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=413"}],"version-history":[{"count":5,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/413\/revisions"}],"predecessor-version":[{"id":418,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=\/wp\/v2\/posts\/413\/revisions\/418"}],"wp:attachment":[{"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=413"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=413"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.5x44.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=413"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}