{"id":1171,"date":"2022-03-04T23:00:24","date_gmt":"2022-03-04T15:00:24","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1171"},"modified":"2022-06-11T02:30:32","modified_gmt":"2022-06-10T18:30:32","slug":"st%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-lookupdns","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1171","title":{"rendered":"ST\u6e90\u7801\u5206\u6790-lookupdns"},"content":{"rendered":"\n<p><code class=\"prettyprint\" >lookupdns<\/code> \u53ea\u6709 300 \u884c\u4ee3\u7801\uff0c\u4f46\u662f\u5374\u6f14\u793a\u4e86 \u5982\u4f55\u4f7f\u7528 \u534f\u7a0b \u5e76\u53d1\u8bf7\u6c42 <code>dns<\/code>\u3002<\/p>\n\n\n\n<p><code class=\"prettyprint\" >lookupdns<\/code> \u7684\u6d41\u7a0b\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"989\" height=\"497\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-4-1.png\" alt=\"\" class=\"wp-image-1174\"\/><\/figure>\n\n\n\n<p>\u7f16\u8bd1\u4e4b\u540e\uff0c\u8fd0\u884c\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >.\/obj\/lookupdns www.xianwaizhiyin.net www.baidu.com<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u4e24\u4e2a\u547d\u4ee4 \u7528\u534f\u7a0b \u67e5\u8be2\u4e86\u4e24\u4e2a\u57df\u540d\uff0c<code class=\"prettyprint\" >wireshark<\/code> \u6293\u5305\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"1001\" height=\"261\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-4-2-1.png\" alt=\"\" class=\"wp-image-1180\"\/><\/figure>\n\n\n\n<p>\u4ece\u6570\u636e\u5305\u4e0a\u770b\uff0c\u4e24\u4e2a <code class=\"prettyprint\" >udp<\/code> \u67e5\u8be2\uff0c\u662f\u5e76\u53d1\u7684\uff0c\u7b2c\u4e8c\u4e2a\u8bf7\u6c42\u5e76\u6ca1\u6709\u88ab\u7b2c\u4e00\u4e2a\u8bf7\u6c42\u963b\u585e\u3002<code>st_recvfrom()<\/code> \u51fd\u6570\u53ea\u4f1a\u963b\u585e\u5f53\u524d\u7684<strong>\u534f\u7a0b<\/strong>\uff0c\u5e76\u4e0d\u4f1a\u963b\u585e\u7b2c\u4e8c\u4e2a\u534f\u7a0b\u3002\u800c\u4e14 \u8fd9\u4e24\u4e2a\u534f\u7a0b \u662f\u5728 \u540c\u4e00\u4e2a\u7ebf\u7a0b\u91cc\u9762\u7684\u3002\u8fd9\u5c31\u662f \u534f\u7a0b\u7684\u7cbe\u9ad3\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>\u6211\u4eec\u5982\u679c\u7528\u539f\u751f\u7684 <code class=\"prettyprint\" >udp<\/code> \u6765\u5199\uff0c\u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int socket_fd1 = socket(PF_INET, SOCK_DGRAM, 0)\nsendto(socket_fd1,www.xianwaizhiyin.net)\n\/\/ recvform \u4f1a\u963b\u585e\u3002\nrecvform(socket_fd1)\n\u200b\nint socket_fd2 = socket(PF_INET, SOCK_DGRAM, 0)\nsendto(socket_fd2,www.baidu.net)\n\/\/ recvform \u4f1a\u963b\u585e\u3002\nrecvform(socket_fd2)<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u4e0a\u9762\u8fd9\u79cd\u5199\u6cd5\uff0c\u8bf7\u6c42\u4e4b\u95f4\u4f1a\u963b\u585e\uff0c\u5982\u679c\u60f3\u4e0d\u963b\u585e\u3002\u53ef\u4ee5\u4f7f\u7528\u64cd\u4f5c\u7cfb\u7edf\u7684 \u7ebf\u7a0b\u51fd\u6570\uff0c<code class=\"prettyprint\" >pthread_create()<\/code>\u3002\u4f46\u662f\u521b\u5efa\u7ebf\u7a0b\u9700\u8981\u4e00\u5b9a\u7684\u5f00\u9500\uff0c\u800c\u4e14\u4e0d\u53ef\u80fd\u67e5\u8be21000\u4e2a\u57df\u540d\u5c31\u5f001000\u4e2a\u7ebf\u7a0b\u3002\u5982\u679c\u4e0d\u4f7f\u7528 <code>pthread_create<\/code> \u662f\u4e0d\u662f\u5c31\u65e0\u6cd5\u5e76\u53d1\u8bf7\u6c42\u4e86\uff1f\u4e0d\u662f\uff0c\u64cd\u4f5c\u7cfb\u7edf\u5176\u5b9e\u672c\u8eab\u4e5f\u6709 EDSM\uff08\u4e8b\u4ef6\u9a71\u52a8\u6a21\u578b\uff09\uff0c\u5c31\u662f <code>epoll<\/code> \uff0c<code>select\/poll<\/code> \u51fd\u6570\u3002<\/p>\n\n\n\n<p>\u7528 <code class=\"prettyprint\" >epoll<\/code> \u5b9e\u73b0 <code>udp<\/code> \u5355\u7ebf\u7a0b\u5e76\u53d1\u8bf7\u6c42\u7684\u4f2a\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >int socket_fd1 = socket(PF_INET, SOCK_DGRAM, 0)\nsendto(socket_fd1,www.xianwaizhiyin.net)\n\u200b\nint socket_fd2 = socket(PF_INET, SOCK_DGRAM, 0)\nsendto(socket_fd2,www.baidu.net)\n\u200b\n\/\/\u76d1\u542c\u4e24\u4e2a fd \u7684\u53d8\u5316\nepoll(socket_fd1,socket_fd2)\n\u200b\n\/\/\u53d8\u5316\u5230\u4e86\uff0c\u5faa\u73af\u8c03 recvform()\nrecvform(socket_fdx)<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u6211\u662f\u7528\u4e86 <code class=\"prettyprint\" >epoll<\/code> \u6765\u76d1\u542c\u4e24\u4e2a <code>fd<\/code> \u7684\u53d8\u5316\uff0c\u6240\u4ee5\u4e24\u4e2a\u8bf7\u6c42\u4e0d\u4f1a\u963b\u585e\u3002<\/p>\n\n\n\n<p>\u90a3\u4e48\u95ee\u9898\u6765\u4e86\uff0c\u65e2\u7136\u64cd\u4f5c\u7cfb\u7edf\u672c\u8eab\u5c31\u6709\u7c7b\u4f3c\u7684\u529f\u80fd\uff0c\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981 state-thread\uff1f<\/p>\n\n\n\n<p>\u95ee\u98981\uff1a\u662f\u4e0d\u662f state-thread \u6bd4 \u64cd\u4f5c\u7cfb\u7edf\u7684 EDSM \u5feb\uff1f<\/p>\n\n\n\n<p>\u89e3\u7b541\uff1a\u4e0d\u662f\uff0c\u4ece\u6027\u80fd\u4e0a\u6765\u8bf4\uff0cST\u548c\u4f20\u7edf\u7684EDSM\u5b9e\u73b0\u4e00\u6837\u5feb\u3002\u4e0a\u4e0b\u6587\u5207\u6362\u7684\u5f00\u9500\u662f\u8fdb\u884c <em><code class=\"prettyprint\" >setjmp()<\/code>\/<\/em><code>longjmp()<\/code>\u7684\u6210\u672c\uff08\u4e0d\u6d89\u53ca\u7cfb\u7edf\u8c03\u7528\uff09\u3002\u8fd9\u5bf9\u4e8e\u6240\u6709\u7684\u5b9e\u9645\u5e94\u7528\u6765\u8bf4\u662f\u53ef\u4ee5\u5ffd\u7565\u4e0d\u8ba1\u7684\u3002\u521b\u5efa\u7ebf\u7a0b\u7684\u5f00\u9500\u4e5f\u975e\u5e38\u5c0f\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Performance-wise ST is as fast as traditional EDSM implementations. The context switch overhead is a cost of doing <code class=\"prettyprint\" >_setjmp()\/_longjmp()<\/code> (no system calls are involved). This is negligible for all practical applications. The thread creation overhead is also very small.<\/p><\/blockquote>\n\n\n\n<p>\u95ee\u98982\uff1a\u662f\u4e0d\u662f state-thread \u5728 \u5185\u5b58\u4f7f\u7528\u6548\u7387\u4e0a \u6bd4 \u64cd\u4f5c\u7cfb\u7edf\u7684 EDSM \u9ad8\uff1f<\/p>\n\n\n\n<p>\u89e3\u7b542\uff1a\u4e5f\u4e0d\u662f\uff0c\u5728\u5185\u5b58\u65b9\u9762\uff0cST\u51e0\u4e4e\u548c\u4f20\u7edf\u7684EDSM\u4e00\u6837\u9ad8\u6548\u3002\u5c3d\u7ba1\u5728 <strong>ST\u534f\u7a0b<\/strong> \u521b\u5efa\u65f6\u4e3a\u6574\u4e2a\u5806\u6808\u6bb5\u4fdd\u7559\u4e86\u4ea4\u6362\u7a7a\u95f4\uff0c\u4f46\u53ea\u6709\u5b9e\u9645\u4f7f\u7528\uff08\u89e6\u53ca\uff09\u7684\u5806\u6808\u9875\u4f1a\u88ab\u5e26\u5165\u7269\u7406\u5185\u5b58\u3002\u7136\u800c\uff0c\u6bcf\u4e2a <strong>ST\u534f\u7a0b<\/strong> \u6709\u4e00\u4e2a\u9875\u9762\u7684\u6700\u5c0f\u5185\u5b58\u8981\u6c42\u3002\u5728\u4efb\u4f55\u60c5\u51b5\u4e0b\uff0c\u65e0\u8bba\u662fST\u8fd8\u662f\u4f20\u7edf\u7684EDSM\uff0c\u6267\u884c\u72b6\u6001\u90fd\u5fc5\u987b\u88ab\u5b58\u50a8\u5728\u67d0\u4e2a\u5730\u65b9\u3002\u628a\u5b83\u4fdd\u5b58\u5728\u5806\u6808\u4e2d\uff0c\u6bd4\u5728\u7279\u8bbe\u6570\u636e\u7ed3\u6784\u4e2d\u66f4\u6709\u6548\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>Memory-wise ST is almost as efficient as traditional EDSMs. Although the swap space is reserved for the entire stack segment upon thread creation, only stack pages that are actually used (touched) will be brought into physical memory. There is, however, one page per thread minimum memory requirement. In any case -- ST or traditional EDSM -- the execution state has to be stored somewhere. Keeping it on the stack is much more efficient than in ad hoc data structures.<\/p><\/blockquote>\n\n\n\n<p>\u65e2\u7136 state-thread \u6027\u80fd \uff0c\u5185\u5b58\u7684\u89d2\u5ea6\u90fd\u4e0d\u6bd4 \u4f20\u7edf\u7684EDSM \u9ad8\u6548\uff0c\u90a3 state-thread \u7684\u4f18\u52bf\u5728\u54ea\u91cc\u5462\uff1f<\/p>\n\n\n\n<p>1\uff0c\u7528 state-thread \u5199\u7684\u4ee3\u7801\u6bd4\u8f83\u901a\u4fd7\u6613\u61c2\uff0c\u56e0\u4e3a <code class=\"prettyprint\" >epoll<\/code> \u7684\u67b6\u6784 \u4f1a\u628a <strong>request<\/strong> \uff08\u8bf7\u6c42\uff09 \u8ddf <strong>response<\/strong> \uff08\u56de\u8c03\uff09 \u5206\u79bb\uff0c\u4e0a\u9762\u7b2c\u4e00\u7248\u963b\u585e\u578b\u7684 <code>udp<\/code> \u662f\u4e0d\u662f\u6bd4 \u7b2c\u4e8c\u7248\u7684 <code>epoll<\/code> \u7684<code>udp<\/code>\u66f4\u6613\u61c2\u3002\u8fd9\u79cd <strong>\u8bf7\u6c42<\/strong> \u8ddf <strong>\u56de\u8c03<\/strong> \u5206\u79bb \u7684\u67b6\u6784\uff0c\u7b80\u5355\u4e1a\u52a1\u770b\u8d77\u6765\u6ca1\u591a\u5927\u5f71\u54cd\uff0c\u4f46\u662f\u5982\u679c\u4f60\u57fa\u4e8eTCP \u5b9e\u73b0\u4e00\u4e2aRTMP \u7684\u534f\u8bae\uff0c\u5c31\u4f1a\u53d1\u73b0 <code>epoll<\/code> \u8fd9\u79cd \u56de\u8c03 \u8ddf \u8bf7\u6c42\u5206\u79bb\u7684\u5199\u6cd5\u7279\u522b\u9ebb\u70e6\uff0c\u56e0\u4e3a RTMP \u662f\u590d\u6742\u7684\u534f\u8bae\uff0c\u8981\u7ecf\u8fc7\u591a\u6b21\u6570\u636e\u5305\u4ea4\u6362\u624d\u80fd\u5efa\u7acb RTMP\u94fe\u63a5\u3002\u6bcf\u4e2a\u5305\u90fd\u662f\u4e00\u4e2a\u72b6\u6001\u53d8\u66f4\uff0c\u5728\u9700\u8981\u56de\u6e90\u65f6\uff0c\u8fd9\u4e2a\u72b6\u6001\u4f1a\u5448\u6307\u6570\u589e\u957f\uff0c\u591a\u5230\u65e0\u6cd5\u5904\u7406\u3002<\/p>\n\n\n\n<p>\u4f46\u662f\uff0c\u4f60\u770b state-thread\uff0c\u4ed6\u7684 <code class=\"prettyprint\" >st_sendto()<\/code> \u4e4b\u540e\uff0c\u53ef\u4ee5\u7acb\u5373\u6267\u884c <code>st_recvfrom()<\/code>\uff0c <code>st_recvfrom()<\/code> \u5e76\u4e0d\u50cf \u64cd\u4f5c\u7cfb\u7edf\u7684 <code>recvform()<\/code> \u4e00\u6837\uff0c\u4f1a\u963b\u585e<strong>\u7ebf\u7a0b<\/strong>\u7684\u5176\u4ed6\u4efb\u52a1\uff0c<code>st_recvfrom()<\/code> \u53ea\u4f1a\u963b\u585e\u5f53\u524d\u534f\u7a0b\uff0c\u4e0d\u4f1a\u963b\u585e\u540c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u5176\u4ed6\u7684\u4efb\u52a1\u3002\u8fd9\u6837\u5c31\u80fd\u628a \u8bf7\u6c42 \uff0c\u8ddf\u5bf9\u9762\u7684 respond \uff08\u56de\u8c03\uff09\u5408\u5728\u4e00\u8d77\uff0c\u987a\u5e8f\u5904\u7406\uff0c\u4ee3\u7801\u770b\u8d77\u6765\u662f\u987a\u5e8f\u7684\u3002\u8fd9\u6837 \u5b9e\u73b0 RTMP \u8fd9\u79cd\u590d\u6742\u534f\u8bae\uff0c\u56e0\u4e3a\u662f\u987a\u5e8f\u7684\uff0c\u6240\u4ee5\u5199\u8d77\u6765\u5c31\u6bd4 <code>epoll<\/code> \u7b80\u5355\u5f88\u591a\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7531\u4e8eST \u5e93\u672c\u8eab\u662f\u5355\u7ebf\u7a0b\u7684\uff0c\u5355\u7ebf\u7a0b\u91cc\u9762\u521b\u5efa\u591a\u4e2a\u534f\u7a0b\u3002\u6240\u4ee5\u5982\u679c\u60f3\u5145\u5206\u5229\u7528\u591a\u6838\u7cfb\u7edf\u7684\u6027\u80fd\uff0c\u53ef\u4ee5\u4f7f\u7528 \u591a\u8fdb\u7a0b + \u591a\u534f\u7a0b\u7684\u6a21\u5f0f\u3002<\/p>\n\n\n\n<p>\u4f8b\u5982\uff0c\u8981\u67e5\u8be2 8000 \u4e2a\u57df\u540d\u7684IP\uff0c\u57284\u6838\u673a\u5668\u4e0a\uff0c\u5c31\u53ef\u4ee5 <code class=\"prettyprint\" >fork()<\/code> \u521b\u5efa 8 \u4e2a\u8fdb\u7a0b\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u91cc\u9762\u67e5\u8be2\u4e00\u4e2a\u57df\u540d\u5c31\u8c03 <code>st_pthread_create()<\/code> \u521b\u5efa\u4e00\u4e2a\u534f\u7a0b\u6765\u67e5\u8be2\uff0c\u8fd9\u6837\u4e0d\u4f1a\u963b\u585e\uff0c\u4e5f\u4e0d\u9700\u8981\u7528 <code>epoll<\/code>\uff0c\u6bcf\u4e2a\u8fdb\u7a0b\u67e5\u8be2\u4e0d\u540c\u7684\u4f4d\u7f6e\uff0c\u8fdb\u7a0bA \u67e5 1~1000\uff0c\u8fdb\u7a0bB \u67e5 10001 ~ 2000\uff0c\u7c7b\u63a8\u3002\u8fd9\u6837\u80fd\u907f\u514d\u7ade\u4e89\u8d44\u6e90\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48 4\u6838 \u521b\u5efa 8\u4e2a\u8fdb\u7a0b\uff0c\u56e0\u4e3a\u53cc\u500d\u4e8e\u6838\u5fc3\u7684\u8fdb\u7a0b\u662f\u6700\u6709\u53ef\u80fd\u8fbe\u5230 \u5e95\u5c42 \u6307\u4ee4\u5e76\u884c\u6267\u884c\u7684\u60c5\u51b5\u3002<\/p>\n\n\n\n<p>\u591a\u8fdb\u7a0b + \u591a\u534f\u7a0b \u662f ST \u5b98\u7f51\u6bd4\u8f83\u63a8\u8350\u7684\u67b6\u6784\uff0c\u56e0\u4e3a\u673a\u5668\u4e0a\uff0c\u4e0d\u53ef\u80fd\u53ea\u8fd0\u884c\u4e00\u79cd\u4efb\u52a1\u7684\u7ebf\u7a0b\uff0c\u80af\u5b9a\u6709\u5176\u4ed6\u4e0d\u540c\u79cd\u7c7b\u7684\u4efb\u52a1\u9700\u8981\u5904\u7406\uff0c\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u8ba2\u5355\u903b\u8f91 \u8ddf \u5e7f\u544a\u903b\u8f91 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