{"id":5121,"date":"2021-03-27T12:39:49","date_gmt":"2021-03-27T04:39:49","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=5121"},"modified":"2021-03-27T12:39:49","modified_gmt":"2021-03-27T04:39:49","slug":"%e4%bd%a0%e7%ae%a1%e8%bf%99%e7%a0%b4%e7%8e%a9%e6%84%8f%e5%8f%ab-io-%e5%a4%9a%e8%b7%af%e5%a4%8d%e7%94%a8%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5121","title":{"rendered":"\u4f60\u7ba1\u8fd9\u7834\u73a9\u610f\u53eb IO \u591a\u8def\u590d\u7528\uff1f"},"content":{"rendered":"
\n
\n
\n

\u539f\u6587\u5730\u5740<\/a><\/h2>\n

 <\/p>\n

<\/a>\u7801\u519c\u7ffb\u8eab<\/span>\u00a0\u6628\u5929<\/em><\/div>\n
<\/div>\n
\n

\u4ee5\u4e0b\u6587\u7ae0\u6765\u6e90\u4e8e\u4f4e\u5e76\u53d1\u7f16\u7a0b\u00a0\uff0c\u4f5c\u8005\u95ea\u5ba2sun<\/p>\n

\"\u4f4e\u5e76\u53d1\u7f16\u7a0b\"<\/span><\/div>\n
\u4f4e\u5e76\u53d1\u7f16\u7a0b<\/strong><\/p>\n

\u6218\u7565\u4e0a\u85d0\u89c6\u6280\u672f\uff0c\u6218\u672f\u4e0a\u91cd\u89c6\u6280\u672f<\/p>\n<\/div>\n

<\/div>\n<\/div>\n
\n
\n
\u4e3a\u4e86\u8bb2\u591a\u8def\u590d\u7528\uff0c\u5f53\u7136\u8fd8\u662f\u8981\u8ddf\u98ce\uff0c\u91c7\u7528\u97ad\u5c38\u7684\u601d\u8def\uff0c\u5148\u8bb2\u8bb2\u4f20\u7edf\u7684\u7f51\u7edc IO \u7684\u5f0a\u7aef\uff0c\u7528\u62c9\u8e29\u7684\u65b9\u5f0f\u6367\u8d77\u591a\u8def\u590d\u7528 IO \u7684\u4f18\u52bf\u3002<\/section>\n

\u4e3a\u4e86\u65b9\u4fbf\u7406\u89e3\uff0c\u4ee5\u4e0b\u6240\u6709\u4ee3\u7801\u90fd\u662f\u4f2a\u4ee3\u7801\uff0c\u77e5\u9053\u5176\u8868\u8fbe\u7684\u610f\u601d\u5373\u53ef\u3002<\/p>\n

Let’s go<\/strong><\/p>\n

\u963b\u585e IO<\/strong><\/span><\/p>\n

\u670d\u52a1\u7aef\u4e3a\u4e86\u5904\u7406\u5ba2\u6237\u7aef\u7684\u8fde\u63a5\u548c\u8bf7\u6c42\u7684\u6570\u636e\uff0c\u5199\u4e86\u5982\u4e0b\u4ee3\u7801\u3002<\/p>\n

\n
listenfd\u00a0=\u00a0socket();\u00a0\u00a0\u00a0\/\/\u00a0\u6253\u5f00\u4e00\u4e2a\u7f51\u7edc\u901a\u4fe1\u7aef\u53e3<\/span>
bind(listenfd);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u7ed1\u5b9a<\/span>
listen(listenfd);\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u76d1\u542c<\/span>
while<\/span>(1<\/span>)\u00a0{
\u00a0\u00a0connfd\u00a0=\u00a0accept(listenfd);\u00a0\u00a0\/\/\u00a0\u963b\u585e\u5efa\u7acb\u8fde\u63a5<\/span>
\u00a0\u00a0int<\/span>\u00a0n\u00a0=\u00a0read(connfd,\u00a0buf);\u00a0\u00a0\/\/\u00a0\u963b\u585e\u8bfb\u6570\u636e<\/span>
\u00a0\u00a0doSomeThing(buf);\u00a0\u00a0\/\/\u00a0\u5229\u7528\u8bfb\u5230\u7684\u6570\u636e\u505a\u4e9b\u4ec0\u4e48<\/span>
\u00a0\u00a0close(connfd);\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5173\u95ed\u8fde\u63a5\uff0c\u5faa\u73af\u7b49\u5f85\u4e0b\u4e00\u4e2a\u8fde\u63a5<\/span>
}<\/code><\/pre>\n<\/section>\n
\u8fd9\u6bb5\u4ee3\u7801\u4f1a\u6267\u884c\u5f97\u78d5\u78d5\u7eca\u7eca\uff0c\u5c31\u50cf\u8fd9\u6837\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u670d\u52a1\u7aef\u7684\u7ebf\u7a0b\u963b\u585e\u5728\u4e86\u4e24\u4e2a\u5730\u65b9\uff0c\u4e00\u4e2a\u662f accept \u51fd\u6570\uff0c\u4e00\u4e2a\u662f read \u51fd\u6570\u3002<\/p>\n
\u5982\u679c\u518d\u628a read \u51fd\u6570\u7684\u7ec6\u8282\u5c55\u5f00\uff0c\u6211\u4eec\u4f1a\u53d1\u73b0\u5176\u963b\u585e\u5728\u4e86\u4e24\u4e2a\u9636\u6bb5\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u8fd9\u5c31\u662f\u4f20\u7edf\u7684\u963b\u585e IO\u3002<\/p>\n
\u6574\u4f53\u6d41\u7a0b\u5982\u4e0b\u56fe\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u6240\u4ee5\uff0c\u5982\u679c\u8fd9\u4e2a\u8fde\u63a5\u7684\u5ba2\u6237\u7aef\u4e00\u76f4\u4e0d\u53d1\u6570\u636e\uff0c\u90a3\u4e48\u670d\u52a1\u7aef\u7ebf\u7a0b\u5c06\u4f1a\u4e00\u76f4\u963b\u585e\u5728 read \u51fd\u6570\u4e0a\u4e0d\u8fd4\u56de\uff0c\u4e5f\u65e0\u6cd5\u63a5\u53d7\u5176\u4ed6\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n
\u8fd9\u80af\u5b9a\u662f\u4e0d\u884c\u7684\u3002<\/p>\n
\u975e\u963b\u585e IO<\/span><\/strong><\/p>\n
 <\/p>\n
\u4e3a\u4e86\u89e3\u51b3\u4e0a\u9762\u7684\u95ee\u9898\uff0c\u5176\u5173\u952e\u5728\u4e8e\u6539\u9020\u8fd9\u4e2a read \u51fd\u6570\u3002<\/p>\n
\u6709\u4e00\u79cd\u806a\u660e\u7684\u529e\u6cd5\u662f\uff0c\u6bcf\u6b21\u90fd\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u8fdb\u7a0b\u6216\u7ebf\u7a0b\uff0c\u53bb\u8c03\u7528 read \u51fd\u6570\uff0c\u5e76\u505a\u4e1a\u52a1\u5904\u7406\u3002<\/p>\n
\n
while<\/span>(1<\/span>)\u00a0{
\u00a0\u00a0connfd\u00a0=\u00a0accept(listenfd);\u00a0\u00a0\/\/\u00a0\u963b\u585e\u5efa\u7acb\u8fde\u63a5<\/span>
\u00a0\u00a0pthread_create\uff08doWork);\u00a0\u00a0\/\/\u00a0\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u7ebf\u7a0b<\/span>
}
void\u00a0doWork()\u00a0<\/span>{
\u00a0\u00a0int<\/span>\u00a0n\u00a0=\u00a0read(connfd,\u00a0buf);\u00a0\u00a0\/\/\u00a0\u963b\u585e\u8bfb\u6570\u636e<\/span>
\u00a0\u00a0doSomeThing(buf);\u00a0\u00a0\/\/\u00a0\u5229\u7528\u8bfb\u5230\u7684\u6570\u636e\u505a\u4e9b\u4ec0\u4e48<\/span>
\u00a0\u00a0close(connfd);\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u5173\u95ed\u8fde\u63a5\uff0c\u5faa\u73af\u7b49\u5f85\u4e0b\u4e00\u4e2a\u8fde\u63a5<\/span>
}<\/code><\/pre>\n<\/section>\n
\u8fd9\u6837\uff0c\u5f53\u7ed9\u4e00\u4e2a\u5ba2\u6237\u7aef\u5efa\u7acb\u597d\u8fde\u63a5\u540e\uff0c\u5c31\u53ef\u4ee5\u7acb\u523b\u7b49\u5f85\u65b0\u7684\u5ba2\u6237\u7aef\u8fde\u63a5\uff0c\u800c\u4e0d\u7528\u963b\u585e\u5728\u539f\u5ba2\u6237\u7aef\u7684 read \u8bf7\u6c42\u4e0a\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u4e0d\u8fc7\uff0c\u8fd9\u4e0d\u53eb\u975e\u963b\u585e IO\uff0c\u53ea\u4e0d\u8fc7\u7528\u4e86\u591a\u7ebf\u7a0b\u7684\u624b\u6bb5\u4f7f\u5f97\u4e3b\u7ebf\u7a0b\u6ca1\u6709\u5361\u5728 read \u51fd\u6570\u4e0a\u4e0d\u5f80\u4e0b\u8d70\u7f62\u4e86\u3002\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u6211\u4eec\u63d0\u4f9b\u7684 read \u51fd\u6570\u4ecd\u7136\u662f\u963b\u585e\u7684\u3002<\/p>\n
\u6240\u4ee5\u771f\u6b63\u7684\u975e\u963b\u585e IO\uff0c\u4e0d\u80fd\u662f\u901a\u8fc7\u6211\u4eec\u7528\u6237\u5c42\u7684\u5c0f\u628a\u620f\uff0c\u800c\u662f\u8981\u6073\u8bf7\u64cd\u4f5c\u7cfb\u7edf\u4e3a\u6211\u4eec\u63d0\u4f9b\u4e00\u4e2a\u975e\u963b\u585e\u7684 read \u51fd\u6570<\/strong>\u3002<\/p>\n
\u8fd9\u4e2a read \u51fd\u6570\u7684\u6548\u679c\u662f\uff0c\u5982\u679c\u6ca1\u6709\u6570\u636e\u5230\u8fbe\u65f6\uff08\u5230\u8fbe\u7f51\u5361\u5e76\u62f7\u8d1d\u5230\u4e86\u5185\u6838\u7f13\u51b2\u533a\uff09\uff0c\u7acb\u523b\u8fd4\u56de\u4e00\u4e2a\u9519\u8bef\u503c\uff08-1\uff09\uff0c\u800c\u4e0d\u662f\u963b\u585e\u5730\u7b49\u5f85\u3002<\/p>\n
\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u4e86\u8fd9\u6837\u7684\u529f\u80fd\uff0c\u53ea\u9700\u8981\u5728\u8c03\u7528 read \u524d\uff0c\u5c06\u6587\u4ef6\u63cf\u8ff0\u7b26\u8bbe\u7f6e\u4e3a\u975e\u963b\u585e\u5373\u53ef\u3002<\/p>\n
\n
fcntl(connfd,\u00a0F_SETFL,\u00a0O_NONBLOCK);
int<\/span>\u00a0n\u00a0=\u00a0read(connfd,\u00a0buffer)\u00a0!=\u00a0SUCCESS);<\/code><\/pre>\n<\/section>\n
\u8fd9\u6837\uff0c\u5c31\u9700\u8981\u7528\u6237\u7ebf\u7a0b\u5faa\u73af\u8c03\u7528 read\uff0c\u76f4\u5230\u8fd4\u56de\u503c\u4e0d\u4e3a -1\uff0c\u518d\u5f00\u59cb\u5904\u7406\u4e1a\u52a1\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u8fd9\u91cc\u6211\u4eec\u6ce8\u610f\u5230\u4e00\u4e2a\u7ec6\u8282\u3002<\/p>\n
\u975e\u963b\u585e\u7684 read\uff0c\u6307\u7684\u662f\u5728\u6570\u636e\u5230\u8fbe\u524d\uff0c\u5373\u6570\u636e\u8fd8\u672a\u5230\u8fbe\u7f51\u5361\uff0c\u6216\u8005\u5230\u8fbe\u7f51\u5361\u4f46\u8fd8\u6ca1\u6709\u62f7\u8d1d\u5230\u5185\u6838\u7f13\u51b2\u533a\u4e4b\u524d\uff0c\u8fd9\u4e2a\u9636\u6bb5\u662f\u975e\u963b\u585e\u7684\u3002<\/p>\n
\u5f53\u6570\u636e\u5df2\u5230\u8fbe\u5185\u6838\u7f13\u51b2\u533a\uff0c\u6b64\u65f6\u8c03\u7528 read \u51fd\u6570\u4ecd\u7136\u662f\u963b\u585e\u7684\uff0c\u9700\u8981\u7b49\u5f85\u6570\u636e\u4ece\u5185\u6838\u7f13\u51b2\u533a\u62f7\u8d1d\u5230\u7528\u6237\u7f13\u51b2\u533a\uff0c\u624d\u80fd\u8fd4\u56de\u3002<\/p>\n
\u6574\u4f53\u6d41\u7a0b\u5982\u4e0b\u56fe<\/p>\n
\"\u56fe\u7247\"<\/p>\n
 <\/p>\n
IO \u591a\u8def\u590d\u7528<\/span><\/strong><\/p>\n
 <\/p>\n
\u4e3a\u6bcf\u4e2a\u5ba2\u6237\u7aef\u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\uff0c\u670d\u52a1\u5668\u7aef\u7684\u7ebf\u7a0b\u8d44\u6e90\u5f88\u5bb9\u6613\u88ab\u8017\u5149\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u5f53\u7136\u8fd8\u6709\u4e2a\u806a\u660e\u7684\u529e\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u6bcf accept \u4e00\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u540e\uff0c\u5c06\u8fd9\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\uff08connfd\uff09\u653e\u5230\u4e00\u4e2a\u6570\u7ec4\u91cc\u3002<\/p>\n
\n
fdlist.add(connfd);<\/code><\/pre>\n<\/section>\n
\u7136\u540e\u5f04\u4e00\u4e2a\u65b0\u7684\u7ebf\u7a0b\u53bb\u4e0d\u65ad\u904d\u5386\u8fd9\u4e2a\u6570\u7ec4\uff0c\u8c03\u7528\u6bcf\u4e00\u4e2a\u5143\u7d20\u7684\u975e\u963b\u585e read \u65b9\u6cd5\u3002<\/p>\n
\n
while<\/span>(1<\/span>)\u00a0{
\u00a0\u00a0for<\/span>(fd\u00a0<--\u00a0fdlist)\u00a0{
\u00a0\u00a0\u00a0\u00a0if<\/span>(read(fd)\u00a0!=\u00a0-1<\/span>)\u00a0{
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0doSomeThing();
\u00a0\u00a0\u00a0\u00a0}
\u00a0\u00a0}
}
<\/code><\/pre>\n<\/section>\n
\u8fd9\u6837\uff0c\u6211\u4eec\u5c31\u6210\u529f\u7528\u4e00\u4e2a\u7ebf\u7a0b\u5904\u7406\u4e86\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u4f60\u662f\u4e0d\u662f\u89c9\u5f97\u8fd9\u6709\u4e9b\u591a\u8def\u590d\u7528\u7684\u610f\u601d\uff1f<\/p>\n
\u4f46\u8fd9\u548c\u6211\u4eec\u7528\u591a\u7ebf\u7a0b\u53bb\u5c06\u963b\u585e IO \u6539\u9020\u6210\u770b\u8d77\u6765\u662f\u975e\u963b\u585e IO \u4e00\u6837\uff0c\u8fd9\u79cd\u904d\u5386\u65b9\u5f0f\u4e5f\u53ea\u662f\u6211\u4eec\u7528\u6237\u81ea\u5df1\u60f3\u51fa\u7684\u5c0f\u628a\u620f\uff0c\u6bcf\u6b21\u904d\u5386\u9047\u5230 read \u8fd4\u56de -1 \u65f6\u4ecd\u7136\u662f\u4e00\u6b21\u6d6a\u8d39\u8d44\u6e90\u7684\u7cfb\u7edf\u8c03\u7528\u3002<\/p>\n
\u5728 while \u5faa\u73af\u91cc\u505a\u7cfb\u7edf\u8c03\u7528\uff0c\u5c31\u597d\u6bd4\u4f60\u505a\u5206\u5e03\u5f0f\u9879\u76ee\u65f6\u5728 while \u91cc\u505a rpc \u8bf7\u6c42\u4e00\u6837\uff0c\u662f\u4e0d\u5212\u7b97\u7684\u3002<\/p>\n
\u6240\u4ee5\uff0c\u8fd8\u662f\u5f97\u6073\u8bf7\u64cd\u4f5c\u7cfb\u7edf\u8001\u5927\uff0c\u63d0\u4f9b\u7ed9\u6211\u4eec\u4e00\u4e2a\u6709\u8fd9\u6837\u6548\u679c\u7684\u51fd\u6570\uff0c\u6211\u4eec\u5c06\u4e00\u6279\u6587\u4ef6\u63cf\u8ff0\u7b26\u901a\u8fc7\u4e00\u6b21\u7cfb\u7edf\u8c03\u7528\u4f20\u7ed9\u5185\u6838\uff0c\u7531\u5185\u6838\u5c42\u53bb\u904d\u5386\uff0c\u624d\u80fd\u771f\u6b63\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n
 <\/p>\n
select<\/strong><\/p>\n
 <\/p>\n
select \u662f\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u7cfb\u7edf\u8c03\u7528\u51fd\u6570\uff0c\u901a\u8fc7\u5b83\uff0c\u6211\u4eec\u53ef\u4ee5\u628a\u4e00\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u6570\u7ec4\u53d1\u7ed9\u64cd\u4f5c\u7cfb\u7edf\uff0c \u8ba9\u64cd\u4f5c\u7cfb\u7edf\u53bb\u904d\u5386\uff0c\u786e\u5b9a\u54ea\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ef\u4ee5\u8bfb\u5199\uff0c \u7136\u540e\u544a\u8bc9\u6211\u4eec\u53bb\u5904\u7406\uff1a<\/p>\n
\"\u56fe\u7247\"<\/p>\n
select\u7cfb\u7edf\u8c03\u7528\u7684\u51fd\u6570\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n
\n
int\u00a0select(
\u00a0\u00a0\u00a0\u00a0int\u00a0nfds,
\u00a0\u00a0\u00a0\u00a0fd_set\u00a0*readfds,
\u00a0\u00a0\u00a0\u00a0fd_set\u00a0*writefds,
\u00a0\u00a0\u00a0\u00a0fd_set\u00a0*exceptfds,
\u00a0\u00a0\u00a0\u00a0struct\u00a0timeval\u00a0*timeout)<\/span>;
\/\/\u00a0nfds:\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u91cc\u6700\u5927\u6587\u4ef6\u63cf\u8ff0\u7b26\u52a01<\/span>
\/\/ readfds\uff1a\u76d1\u63a7\u6709\u8bfb\u6570\u636e\u5230\u8fbe\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\uff0c\u4f20\u5165\u4f20\u51fa\u53c2\u6570<\/span>
\/\/ writefds\uff1a\u76d1\u63a7\u5199\u6570\u636e\u5230\u8fbe\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\uff0c\u4f20\u5165\u4f20\u51fa\u53c2\u6570<\/span>
\/\/ exceptfds\uff1a\u76d1\u63a7\u5f02\u5e38\u53d1\u751f\u8fbe\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408, \u4f20\u5165\u4f20\u51fa\u53c2\u6570<\/span>
\/\/ timeout\uff1a\u5b9a\u65f6\u963b\u585e\u76d1\u63a7\u65f6\u95f4\uff0c3\u79cd\u60c5\u51b5<\/span>
\/\/\u00a0\u00a01.NULL\uff0c\u6c38\u8fdc\u7b49\u4e0b\u53bb<\/span>
\/\/\u00a0\u00a02.\u8bbe\u7f6etimeval\uff0c\u7b49\u5f85\u56fa\u5b9a\u65f6\u95f4<\/span>
\/\/\u00a0\u00a03.\u8bbe\u7f6etimeval\u91cc\u65f6\u95f4\u5747\u4e3a0\uff0c\u68c0\u67e5\u63cf\u8ff0\u5b57\u540e\u7acb\u5373\u8fd4\u56de\uff0c\u8f6e\u8be2<\/span><\/code><\/pre>\n<\/section>\n
\u670d\u52a1\u7aef\u4ee3\u7801\uff0c\u8fd9\u6837\u6765\u5199\u3002<\/p>\n
\u9996\u5148\u4e00\u4e2a\u7ebf\u7a0b\u4e0d\u65ad\u63a5\u53d7\u5ba2\u6237\u7aef\u8fde\u63a5\uff0c\u5e76\u628a socket \u6587\u4ef6\u63cf\u8ff0\u7b26\u653e\u5230\u4e00\u4e2a list \u91cc\u3002<\/p>\n
\n
while<\/span>(1<\/span>)\u00a0{
\u00a0\u00a0connfd\u00a0=\u00a0accept(listenfd);
\u00a0\u00a0fcntl(connfd,\u00a0F_SETFL,\u00a0O_NONBLOCK);
\u00a0\u00a0fdlist.add(connfd);
}<\/code><\/pre>\n<\/section>\n
\u7136\u540e\uff0c\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u4e0d\u518d\u81ea\u5df1\u904d\u5386\uff0c\u800c\u662f\u8c03\u7528 select\uff0c\u5c06\u8fd9\u6279\u6587\u4ef6\u63cf\u8ff0\u7b26 list \u4ea4\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u53bb\u904d\u5386\u3002<\/p>\n
\n
while<\/span>(1<\/span>)\u00a0{
\u00a0\u00a0\/\/\u00a0\u628a\u4e00\u5806\u6587\u4ef6\u63cf\u8ff0\u7b26\u00a0list\u00a0\u4f20\u7ed9\u00a0select\u00a0\u51fd\u6570<\/span>
\u00a0\u00a0\/\/\u00a0\u6709\u5df2\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u5c31\u8fd4\u56de\uff0cnready\u00a0\u8868\u793a\u6709\u591a\u5c11\u4e2a\u5c31\u7eea\u7684<\/span>
\u00a0\u00a0nready\u00a0=\u00a0select(list<\/span>);
\u00a0\u00a0...
}<\/code><\/pre>\n<\/section>\n
\u4e0d\u8fc7\uff0c\u5f53 select \u51fd\u6570\u8fd4\u56de\u540e\uff0c\u7528\u6237\u4f9d\u7136\u9700\u8981\u904d\u5386\u521a\u521a\u63d0\u4ea4\u7ed9\u64cd\u4f5c\u7cfb\u7edf\u7684 list\u3002<\/p>\n
\u53ea\u4e0d\u8fc7\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u5c06\u51c6\u5907\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u505a\u4e0a\u6807\u8bc6\uff0c\u7528\u6237\u5c42\u5c06\u4e0d\u4f1a\u518d\u6709\u65e0\u610f\u4e49\u7684\u7cfb\u7edf\u8c03\u7528\u5f00\u9500\u3002<\/p>\n
\n
while<\/span>(1<\/span>)\u00a0{
\u00a0\u00a0nready\u00a0=\u00a0select(list<\/span>);
\u00a0\u00a0\/\/\u00a0\u7528\u6237\u5c42\u4f9d\u7136\u8981\u904d\u5386\uff0c\u53ea\u4e0d\u8fc7\u5c11\u4e86\u5f88\u591a\u65e0\u6548\u7684\u7cfb\u7edf\u8c03\u7528<\/span>
\u00a0\u00a0for<\/span>(fd\u00a0<--\u00a0fdlist)\u00a0{
\u00a0\u00a0\u00a0\u00a0if<\/span>(fd\u00a0!=\u00a0-1<\/span>)\u00a0{
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u53ea\u8bfb\u5df2\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0read(fd,\u00a0buf);
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0\u603b\u5171\u53ea\u6709\u00a0nready\u00a0\u4e2a\u5df2\u5c31\u7eea\u63cf\u8ff0\u7b26\uff0c\u4e0d\u7528\u8fc7\u591a\u904d\u5386<\/span>
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0if<\/span>(--nready\u00a0==\u00a00<\/span>)\u00a0break<\/span>;
\u00a0\u00a0\u00a0\u00a0}
\u00a0\u00a0}
}<\/code><\/pre>\n<\/section>\n
\u6b63\u5982\u521a\u521a\u7684\u52a8\u56fe\u4e2d\u6240\u63cf\u8ff0\u7684\uff0c\u5176\u76f4\u89c2\u6548\u679c\u5982\u4e0b\u3002\uff08\u540c\u4e00\u4e2a\u52a8\u56fe\u6d88\u8017\u4e86\u4f60\u4e24\u6b21\u6d41\u91cf\uff0c\u6c14\u4e0d\u6c14\uff1f\uff09<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u53ef\u4ee5\u770b\u51fa\u51e0\u4e2a\u7ec6\u8282\uff1a<\/p>\n
1. select \u8c03\u7528\u9700\u8981\u4f20\u5165 fd \u6570\u7ec4\uff0c\u9700\u8981\u62f7\u8d1d\u4e00\u4efd\u5230\u5185\u6838\uff0c\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u8fd9\u6837\u7684\u62f7\u8d1d\u6d88\u8017\u7684\u8d44\u6e90\u662f\u60ca\u4eba\u7684\u3002\uff08\u53ef\u4f18\u5316\u4e3a\u4e0d\u590d\u5236\uff09<\/span><\/section>\n
2. select \u5728\u5185\u6838\u5c42\u4ecd\u7136\u662f\u901a\u8fc7\u904d\u5386\u7684\u65b9\u5f0f\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5c31\u7eea\u72b6\u6001\uff0c\u662f\u4e2a\u540c\u6b65\u8fc7\u7a0b\uff0c\u53ea\u4e0d\u8fc7\u65e0\u7cfb\u7edf\u8c03\u7528\u5207\u6362\u4e0a\u4e0b\u6587\u7684\u5f00\u9500\u3002\uff08\u5185\u6838\u5c42\u53ef\u4f18\u5316\u4e3a\u5f02\u6b65\u4e8b\u4ef6\u901a\u77e5\uff09<\/span><\/section>\n
3. select \u4ec5\u4ec5\u8fd4\u56de\u53ef\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570\uff0c\u5177\u4f53\u54ea\u4e2a\u53ef\u8bfb\u8fd8\u662f\u8981\u7528\u6237\u81ea\u5df1\u904d\u5386\u3002\uff08\u53ef\u4f18\u5316\u4e3a\u53ea\u8fd4\u56de\u7ed9\u7528\u6237\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u65e0\u9700\u7528\u6237\u505a\u65e0\u6548\u7684\u904d\u5386\uff09<\/span><\/section>\n
\u6574\u4e2a select \u7684\u6d41\u7a0b\u56fe\u5982\u4e0b\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u8fd9\u79cd\u65b9\u5f0f\uff0c\u65e2\u505a\u5230\u4e86\u4e00\u4e2a\u7ebf\u7a0b\u5904\u7406\u591a\u4e2a\u5ba2\u6237\u7aef\u8fde\u63a5\uff08\u6587\u4ef6\u63cf\u8ff0\u7b26\uff09\uff0c\u53c8\u51cf\u5c11\u4e86\u7cfb\u7edf\u8c03\u7528\u7684\u5f00\u9500\uff08\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u53ea\u6709\u4e00\u6b21 select \u7684\u7cfb\u7edf\u8c03\u7528 + n \u6b21\u5c31\u7eea\u72b6\u6001\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684 read \u7cfb\u7edf\u8c03\u7528\uff09<\/span>\u3002<\/p>\n
poll<\/strong><\/p>\n
 <\/p>\n
poll \u4e5f\u662f\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\u7cfb\u7edf\u8c03\u7528\u51fd\u6570\u3002<\/p>\n
\n
int\u00a0poll(struct\u00a0pollfd\u00a0*fds,\u00a0nfds_tnfds,\u00a0int\u00a0timeout)<\/span>;

struct\u00a0pollfd\u00a0{<\/span>
\u00a0\u00a0intfd;\u00a0\/*\u6587\u4ef6\u63cf\u8ff0\u7b26*\/<\/span>
\u00a0\u00a0shortevents;\u00a0\/*\u76d1\u63a7\u7684\u4e8b\u4ef6*\/<\/span>
\u00a0\u00a0shortrevents;\u00a0\/*\u76d1\u63a7\u4e8b\u4ef6\u4e2d\u6ee1\u8db3\u6761\u4ef6\u8fd4\u56de\u7684\u4e8b\u4ef6*\/<\/span>
};
<\/code><\/pre>\n<\/section>\n
\u5b83\u548c select \u7684\u4e3b\u8981\u533a\u522b\u5c31\u662f\uff0c\u53bb\u6389\u4e86 select \u53ea\u80fd\u76d1\u542c 1024 \u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u9650\u5236\u3002<\/p>\n
 <\/p>\n
epoll<\/strong><\/p>\n
 <\/p>\n
epoll \u662f\u6700\u7ec8\u7684\u5927 boss\uff0c\u5b83\u89e3\u51b3\u4e86 select \u548c poll \u7684\u4e00\u4e9b\u95ee\u9898\u3002<\/p>\n
\u8fd8\u8bb0\u5f97\u4e0a\u9762\u8bf4\u7684 select \u7684\u4e09\u4e2a\u7ec6\u8282\u4e48\uff1f<\/p>\n
1. select \u8c03\u7528\u9700\u8981\u4f20\u5165 fd \u6570\u7ec4\uff0c\u9700\u8981\u62f7\u8d1d\u4e00\u4efd\u5230\u5185\u6838\uff0c\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u8fd9\u6837\u7684\u62f7\u8d1d\u6d88\u8017\u7684\u8d44\u6e90\u662f\u60ca\u4eba\u7684\u3002\uff08\u53ef\u4f18\u5316\u4e3a\u4e0d\u590d\u5236\uff09<\/span><\/section>\n
2. select \u5728\u5185\u6838\u5c42\u4ecd\u7136\u662f\u901a\u8fc7\u904d\u5386\u7684\u65b9\u5f0f\u68c0\u67e5\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u5c31\u7eea\u72b6\u6001\uff0c\u662f\u4e2a\u540c\u6b65\u8fc7\u7a0b\uff0c\u53ea\u4e0d\u8fc7\u65e0\u7cfb\u7edf\u8c03\u7528\u5207\u6362\u4e0a\u4e0b\u6587\u7684\u5f00\u9500\u3002\uff08\u5185\u6838\u5c42\u53ef\u4f18\u5316\u4e3a\u5f02\u6b65\u4e8b\u4ef6\u901a\u77e5\uff09<\/span><\/section>\n
3. select \u4ec5\u4ec5\u8fd4\u56de\u53ef\u8bfb\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u4e2a\u6570\uff0c\u5177\u4f53\u54ea\u4e2a\u53ef\u8bfb\u8fd8\u662f\u8981\u7528\u6237\u81ea\u5df1\u904d\u5386\u3002\uff08\u53ef\u4f18\u5316\u4e3a\u53ea\u8fd4\u56de\u7ed9\u7528\u6237\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u65e0\u9700\u7528\u6237\u505a\u65e0\u6548\u7684\u904d\u5386\uff09<\/span><\/section>\n
\u6240\u4ee5 epoll \u4e3b\u8981\u5c31\u662f\u9488\u5bf9\u8fd9\u4e09\u70b9\u8fdb\u884c\u4e86\u6539\u8fdb\u3002<\/p>\n
1. \u5185\u6838\u4e2d\u4fdd\u5b58\u4e00\u4efd\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\uff0c\u65e0\u9700\u7528\u6237\u6bcf\u6b21\u90fd\u91cd\u65b0\u4f20\u5165\uff0c\u53ea\u9700\u544a\u8bc9\u5185\u6838\u4fee\u6539\u7684\u90e8\u5206\u5373\u53ef\u3002<\/span><\/section>\n
2. \u5185\u6838\u4e0d\u518d\u901a\u8fc7\u8f6e\u8be2\u7684\u65b9\u5f0f\u627e\u5230\u5c31\u7eea\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\uff0c\u800c\u662f\u901a\u8fc7\u5f02\u6b65 IO \u4e8b\u4ef6\u5524\u9192\u3002<\/span><\/section>\n
3. \u5185\u6838\u4ec5\u4f1a\u5c06\u6709 IO \u4e8b\u4ef6\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u8fd4\u56de\u7ed9\u7528\u6237\uff0c\u7528\u6237\u4e5f\u65e0\u9700\u904d\u5386\u6574\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u96c6\u5408\u3002<\/span><\/section>\n
\u5177\u4f53\uff0c\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u4e86\u8fd9\u4e09\u4e2a\u51fd\u6570\u3002<\/p>\n
\u7b2c\u4e00\u6b65\uff0c\u521b\u5efa\u4e00\u4e2a epoll \u53e5\u67c4<\/p>\n
\n
int\u00a0epoll_create(int\u00a0size)<\/span>;<\/code><\/pre>\n<\/section>\n
\u7b2c\u4e8c\u6b65\uff0c\u5411\u5185\u6838\u6dfb\u52a0\u3001\u4fee\u6539\u6216\u5220\u9664\u8981\u76d1\u63a7\u7684\u6587\u4ef6\u63cf\u8ff0\u7b26\u3002<\/p>\n
\n
int\u00a0epoll_ctl(
\u00a0\u00a0int\u00a0epfd,\u00a0int\u00a0op,\u00a0int\u00a0fd,\u00a0struct\u00a0epoll_event\u00a0*event)<\/span>;<\/code><\/pre>\n<\/section>\n
\u7b2c\u4e09\u6b65\uff0c\u7c7b\u4f3c\u53d1\u8d77\u4e86 select() \u8c03\u7528<\/p>\n
\n
int\u00a0epoll_wait(
\u00a0\u00a0int\u00a0epfd,\u00a0struct\u00a0epoll_event\u00a0*events,\u00a0int\u00a0max\u00a0events,\u00a0int\u00a0timeout)<\/span>;
<\/code><\/pre>\n<\/section>\n
\u4f7f\u7528\u8d77\u6765\uff0c\u5176\u5185\u90e8\u539f\u7406\u5c31\u50cf\u5982\u4e0b\u4e00\u822c\u4e1d\u6ed1\u3002<\/p>\n
\"\u56fe\u7247\"<\/p>\n
\u5982\u679c\u4f60\u60f3\u7ee7\u7eed\u6df1\u5165\u4e86\u89e3 epoll \u7684\u5e95\u5c42\u539f\u7406\uff0c\u63a8\u8350\u9605\u8bfb\u98de\u54e5\u7684\u300a\u56fe\u89e3 | \u6df1\u5165\u63ed\u79d8 epoll \u662f\u5982\u4f55\u5b9e\u73b0 IO \u591a\u8def\u590d\u7528\u7684\uff01<\/a>\u300b\uff0c\u4ece linux \u6e90\u7801\u7ea7\u522b\uff0c\u4e00\u884c\u4e00\u884c\u975e\u5e38\u786c\u6838\u5730\u89e3\u8bfb epoll \u7684\u5b9e\u73b0\u539f\u7406\uff0c\u4e14\u914d\u6709\u5927\u91cf\u65b9\u4fbf\u7406\u89e3\u7684\u56fe\u7247\uff0c\u975e\u5e38\u9002\u5408\u6e90\u7801\u63a7\u7684\u5c0f\u4f19\u4f34\u9605\u8bfb\u3002<\/p>\n
\n
\n
\n
\n
\n
\n
\n
\u540e\u8bb0<\/strong><\/span><\/p>\n<\/section>\n
\n
\n
\n
<\/section>\n
<\/section>\n
\n
<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/section>\n<\/blockquote>\n<\/section>\n<\/section>\n<\/blockquote>\n<\/section>\n
 <\/p>\n
\u5927\u767d\u8bdd\u603b\u7ed3\u4e00\u4e0b\u3002<\/section>\n
\u4e00\u5207\u7684\u5f00\u59cb\uff0c\u90fd\u8d77\u6e90\u4e8e\u8fd9\u4e2a read \u51fd\u6570\u662f\u64cd\u4f5c\u7cfb\u7edf\u63d0\u4f9b\u7684\uff0c\u800c\u4e14\u662f\u963b\u585e\u7684\uff0c\u6211\u4eec\u53eb\u5b83\u00a0\u963b\u585e IO<\/strong>\u3002<\/section>\n
\u4e3a\u4e86\u7834\u8fd9\u4e2a\u5c40\uff0c\u7a0b\u5e8f\u5458\u5728\u7528\u6237\u6001\u901a\u8fc7\u591a\u7ebf\u7a0b\u6765\u9632\u6b62\u4e3b\u7ebf\u7a0b\u5361\u6b7b\u3002<\/section>\n
\u540e\u6765\u64cd\u4f5c\u7cfb\u7edf\u53d1\u73b0\u8fd9\u4e2a\u9700\u6c42\u6bd4\u8f83\u5927\uff0c\u4e8e\u662f\u5728\u64cd\u4f5c\u7cfb\u7edf\u5c42\u9762\u63d0\u4f9b\u4e86\u975e\u963b\u585e\u7684 read \u51fd\u6570\uff0c\u8fd9\u6837\u7a0b\u5e8f\u5458\u5c31\u53ef\u4ee5\u5728\u4e00\u4e2a\u7ebf\u7a0b\u5185\u5b8c\u6210\u591a\u4e2a\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u8bfb\u53d6\uff0c\u8fd9\u5c31\u662f\u00a0\u975e\u963b\u585e IO<\/strong>\u3002<\/section>\n
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\u540e\u6765\u64cd\u4f5c\u7cfb\u7edf\u53c8\u53d1\u73b0\u8fd9\u4e2a\u573a\u666f\u9700\u6c42\u91cf\u8f83\u5927\uff0c\u4e8e\u662f\u53c8\u5728\u64cd\u4f5c\u7cfb\u7edf\u5c42\u9762\u63d0\u4f9b\u4e86\u8fd9\u6837\u7684\u904d\u5386\u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u673a\u5236\uff0c\u8fd9\u5c31\u662f\u00a0IO \u591a\u8def\u590d\u7528<\/strong>\u3002<\/section>\n
\u591a\u8def\u590d\u7528\u6709\u4e09\u4e2a\u51fd\u6570\uff0c\u6700\u5f00\u59cb\u662f select\uff0c\u7136\u540e\u53c8\u53d1\u660e\u4e86 poll \u89e3\u51b3\u4e86 select \u6587\u4ef6\u63cf\u8ff0\u7b26\u7684\u9650\u5236\uff0c\u7136\u540e\u53c8\u53d1\u660e\u4e86 epoll \u89e3\u51b3 select \u7684\u4e09\u4e2a\u4e0d\u8db3\u3002<\/section>\n
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\u5c31\u597d\u6bd4\u6211\u4eec\u5e73\u65f6\u5199\u4e1a\u52a1\u4ee3\u7801\uff0c\u628a\u539f\u6765 while \u5faa\u73af\u91cc\u8c03 http \u63a5\u53e3\u8fdb\u884c\u6279\u91cf\uff0c\u6539\u6210\u4e86\u8ba9\u5bf9\u65b9\u63d0\u4f9b\u4e00\u4e2a\u6279\u91cf\u6dfb\u52a0\u7684 http \u63a5\u53e3\uff0c\u7136\u540e\u6211\u4eec\u4e00\u6b21 rpc \u8bf7\u6c42\u5c31\u5b8c\u6210\u4e86\u6279\u91cf\u6dfb\u52a0\u3002<\/section>\n
\u4e00\u4e2a\u9053\u7406\u3002<\/section>\n
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\"\u4f4e\u5e76\u53d1\u7f16\u7a0b\"<\/div>\n
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\u4f4e\u5e76\u53d1\u7f16\u7a0b<\/strong><\/p>\n
\u6218\u7565\u4e0a\u85d0\u89c6\u6280\u672f\uff0c\u6218\u672f\u4e0a\u91cd\u89c6\u6280\u672f<\/div>\n
38\u7bc7\u539f\u521b\u5185\u5bb9<\/span><\/div>\n<\/div>\n
<\/i><\/div>\n<\/div>\n<\/div>\n
\u516c\u4f17\u53f7<\/div>\n<\/div>\n<\/section>\n<\/section>\n<\/div>\n<\/div>\n
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