{"id":1306,"date":"2022-03-09T16:07:07","date_gmt":"2022-03-09T08:07:07","guid":{"rendered":"https:\/\/www.xianwaizhiyin.net\/?p=1306"},"modified":"2022-06-11T02:25:31","modified_gmt":"2022-06-10T18:25:31","slug":"st%e6%ba%90%e7%a0%81%e5%88%86%e6%9e%90-st_usleep","status":"publish","type":"post","link":"https:\/\/www.xianwaizhiyin.net\/?p=1306","title":{"rendered":"ST\u6e90\u7801\u5206\u6790-st_usleep"},"content":{"rendered":"\n<p>\u7531\u4e8e ST \u5e93\u662f\u5355\u7ebf\u7a0b\u7a0b\u5e8f\uff0c\u5982\u679c\u4f7f\u7528\u4e86 <code class=\"prettyprint\" >unistd.h<\/code> \u91cc\u9762\u7684 <code>sleep()<\/code> \u6216\u8005 <code>usleep()<\/code> \u51fd\u6570\uff0c\u5c31\u4f1a\u963b\u585e\u6240\u6709\u534f\u7a0b\u51fd\u6570\u7684\u6267\u884c\u3002\u4f46\u662f\u6709\u65f6\u5019\uff0c\u67d0\u4e2a\u534f\u7a0b\u786e\u5b9e\u8981 <code>sleep<\/code> \u4f11\u7720\u4e00\u4e9b\u65f6\u95f4\uff0c\u90a3\u600e\u4e48\u529e\uff1f<\/p>\n\n\n\n<p>ST \u5e93\u63d0\u4f9b\u4e86 <code class=\"prettyprint\" >st_usleep()<\/code> \u51fd\u6570\uff0c\u4f7f\u7528\u8fd9\u4e2a\u51fd\u6570\uff0c\u5c31\u53ef\u4ee5\u8ba9\u67d0\u4e2a\u534f\u7a0b\u4f11\u7720\u4e00\u6bb5\u65f6\u95f4\uff0c\u4f46\u662f\u53c8\u4e0d\u4f1a\u963b\u585e\u5176\u4ed6\u7684\u534f\u7a0b\u51fd\u6570\u7684\u6267\u884c\u3002\u4e0b\u9762\u5c31\u7528\u4e00\u5c0f\u6bb5\u4ee3\u7801\u6f14\u793a\u4e00\u4e0b <code>st_usleep()<\/code> \u7684\u7528\u6cd5\uff0c\u4ee3\u7801\u5982\u4e0b\uff0c\u4e3a\u4e86\u7b80\u6d01\uff0c\u7701\u7565\u4e86\u9519\u8bef\u5904\u7406\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"prettyprint\" >#include &lt;stdio.h&gt;\n#include &quot;st.h&quot;\n#include &quot;..\/common.h&quot;\n\u200b\nvoid *print_a(void *arg) {\n    st_usleep(2 * 1000000LL);\n    st_utime_t time_now = st_utime();\n    printf(&quot;I am a , %lld\\r\\n&quot;, time_now);\n    return NULL;\n}\n\u200b\nvoid *print_b(void *arg) {\n    st_utime_t time_now = st_utime();\n    printf(&quot;I am b , %lld\\r\\n&quot;, time_now);\n    return NULL;\n}\n\u200b\nint main(int argc, char *argv&#091;]) {\n    st_init();\n\u200b\n    st_thread_create(print_a, NULL, 0, 0);\n    st_thread_create(print_b, NULL, 0, 0);\n\u200b\n    st_thread_exit(NULL);\n\u200b\n    \/* NOTREACHED *\/\n    return 1;\n}<\/code><\/pre>\n\n\n\n<p>\u6267\u884c\u4e4b\u540e\u7684\u7ed3\u679c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"741\" height=\"173\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-1.png\" alt=\"\" class=\"wp-image-1310\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-1.png 741w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-1-300x70.png 300w\" sizes=\"auto, (max-width: 741px) 100vw, 741px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u770b\u5230\uff0cb \u534f\u7a0b <code class=\"prettyprint\" >sleep<\/code> \u5e76\u4e0d\u4f1a\u963b\u585e a \u534f\u7a0b\u7684\u8fd0\u884c\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>google_ads_content<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u4e0b\u9762\u5c31\u6765\u5206\u6790\u4e00\u6b21 <code class=\"prettyprint\" >st_usleep()<\/code> \u7684\u5b9e\u73b0\u539f\u7406\u3002<\/p>\n\n\n\n<p>\u91cd\u70b9\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"549\" height=\"586\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-2.png\" alt=\"\" class=\"wp-image-1311\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-2.png 549w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-2-281x300.png 281w\" sizes=\"auto, (max-width: 549px) 100vw, 549px\" \/><\/figure>\n\n\n\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u628a a \u534f\u7a0b\u72b6\u6001\u6539\u6210 <code class=\"prettyprint\" >_ST_ST_SLEEPING<\/code> \uff0c\u7136\u540e\u628a a \u534f\u7a0b\u52a0\u8fdb\u53bb <code>SLEEPQ<\/code> \u961f\u5217\uff0c\u7136\u540e\u5c31 \u5f00\u59cb\u7528 <code>_ST_SWITCH_CONTEXT()<\/code> \u5207\u6362\u534f\u7a0b\uff0c\u6b64\u65f6 a \u534f\u7a0b\u5c31\u4f1a\u88ab\u6302\u8d77\uff0c\u56e0\u4e3a \u7cfb\u7edf<strong>\u7ebf\u7a0b<\/strong> \u5df2\u7ecf\u5207\u6362\u5230\u522b\u7684\u5730\u65b9\u8fd0\u884c\u4e86\uff0c \u6240\u4ee5 a \u534f\u7a0b\u770b\u8d77\u6765\u662f\u963b\u585e\u4e86\u3002<\/p>\n\n\n\n<p>\u4ece\u4e4b\u524d\u7684\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u77e5\u9053 <code class=\"prettyprint\" >_ST_SWITCH_CONTEXT()<\/code> \u4f1a\u4e0d\u65ad\u5730\u8c03 <code>_st_vp_schedule()<\/code> \u6765\u8c03\u5ea6\u5904\u7406\u5176\u4ed6\u534f\u7a0b\uff0c\u5904\u7406\u5b8c\u5176\u4ed6\u534f\u7a0b\u4e4b\u540e\uff0c\u5c31\u4f1a\u8fdb\u5165 <code>_st_idle_thread_start()<\/code>\u3002<\/p>\n\n\n\n<p>\u4e5f\u5c31\u662f\u8bf4\uff0cb \u534f\u7a0b\u8dd1\u5b8c\u4e4b\u540e\uff0c\u5c31\u4f1a\u8fdb\u5165 <code class=\"prettyprint\" >_st_idle_thread_start()<\/code>\uff0c\u8bf7\u770b\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"631\" height=\"542\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-3.png\" alt=\"\" class=\"wp-image-1308\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-3.png 631w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-3-300x258.png 300w\" sizes=\"auto, (max-width: 631px) 100vw, 631px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >_st_vp_check_clock()<\/code> \u5c31\u662f\u5904\u7406 \u8fdb\u5165 <code>_ST_ST_SLEEPING<\/code> \u72b6\u6001\u7684\u534f\u7a0b\u3002\u4ee3\u7801\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"674\" height=\"665\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-4.png\" alt=\"\" class=\"wp-image-1309\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-4.png 674w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-4-300x296.png 300w\" sizes=\"auto, (max-width: 674px) 100vw, 674px\" \/><\/figure>\n\n\n\n<p><code class=\"prettyprint\" >_st_vp_check_clock()<\/code> \u51fd\u6570\u67093\u4e2a\u91cd\u70b9\uff1a<\/p>\n\n\n\n<p><strong>1\uff0c<\/strong>\u53d8\u91cf <code class=\"prettyprint\" >elapsed<\/code> \u6ca1\u6709\u7528\u5230\u3002<\/p>\n\n\n\n<p><strong>2\uff0c<\/strong>\u4f7f\u7528 <code class=\"prettyprint\" >if (thread-&gt;due &gt; now)<\/code> \u6765\u5224\u65ad \u65f6\u95f4\u662f\u5426\u5230\u4e86\uff0c\u8fd9\u91cc <code>thread-&gt;due<\/code> \u7684\u5b9e\u73b0\u975e\u5e38\u6709\u8da3\uff0cdue \u662f\u5728 <code>_st_add_sleep_q()<\/code> \u52a0\u5165 SLEEPQ \u961f\u5217\u7684\u65f6\u5019\u8d4b\u503c\u7684\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"556\" height=\"178\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-5.png\" alt=\"\" class=\"wp-image-1314\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-5.png 556w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-5-300x96.png 300w\" sizes=\"auto, (max-width: 556px) 100vw, 556px\" \/><\/figure>\n\n\n\n<p>\u4e0b\u9762\u5c31\u6765\u770b\u770b <code class=\"prettyprint\" >_ST_LAST_CLOCK<\/code> \u662f\u4ec0\u4e48\u65f6\u5019\u8d4b\u503c\u7684\uff0c\u5982\u4e0b\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"529\" height=\"290\" src=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-6.png\" alt=\"\" class=\"wp-image-1313\" srcset=\"https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-6.png 529w, https:\/\/www.xianwaizhiyin.net\/wp-content\/uploads\/2022\/03\/st-13-6-300x164.png 300w\" sizes=\"auto, (max-width: 529px) 100vw, 529px\" \/><\/figure>\n\n\n\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u5230\uff0c<code class=\"prettyprint\" >_ST_LAST_CLOCK<\/code> \u662f\u5728\u4e0a\u4e00\u6b21\u8c03\u5ea6\u7684\u65f6\u5019\u8d4b\u503c\u7684<strong>\u3002\u56e0\u6b64\uff0c\u5982\u679c \u4ece\u4e0a\u4e00\u6b21\u4e0a\u4e0b\u6587\u5207\u6362\u5230\u73b0\u5728\u5df2\u7ecf\u8fc7\u53bb\u4e868\u6beb\u79d2\uff0c\u800c <code>st_usleep()<\/code> \u4e3a10\u6beb\u79d2\uff0c\u90a3\u4e48 \u5728 \u8c03\u7528 <code>st_usleep()<\/code> \u4e4b\u540e\uff0c\u53ef\u80fd \u518d\u8fc72\u6beb\u79d2 \u5c31\u4f1a\u7acb\u5373\u8fd4\u56de\u3002<\/strong><\/p>\n\n\n\n<p><strong>3\uff0c<\/strong><code class=\"prettyprint\" >_ST_DEL_SLEEPQ(thread);<\/code> -&gt; <code>thread-&gt;state = _ST_ST_RUNNABLE<\/code> -&gt; <code>_ST_ADD_RUNQ(thread)<\/code><\/p>\n\n\n\n<p>\u4e3b\u8981\u5c31\u4e0a\u9762\u8fd9\u51e0\u884c\u4ee3\u7801\uff0c\u65f6\u95f4\u5230\u4e86\uff0c\u5c31\u628a \u534f\u7a0b\u4ece <code class=\"prettyprint\" >SLEEPQ<\/code> \u5220\u9664\uff0c\u628a\u534f\u7a0b\u72b6\u6001\u6539\u6210 <code>_ST_ST_RUNNABLE<\/code>\uff0c\u518d\u52a0\u8fdb\u53bb <code>RUNQ<\/code> \u961f\u5217\uff0c \u7136\u540e\u4e0b\u6b21 <code>_st_vp_schedule()<\/code> \u8c03\u5ea6\uff0c <code>_ST_ST_RUNNABLE<\/code> \u72b6\u6001\u7684\u534f\u7a0b\u5c31\u80fd\u7ee7\u7eed\u8dd1\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u4e0d\u8fc7\u4e0a\u9762\u7684\u8fd9\u79cd sleep \u5b9e\u73b0\uff0c\u4f1a\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u56e0\u4e3a\u662f\u5904\u7406\u5b8c\u5176\u4ed6\u534f\u7a0b\u624d\u4f1a\u8fdb\u5165 <code class=\"prettyprint\" >_st_idle_thread_start()<\/code>\uff0c\u5982\u679c\u5176\u4ed6\u7684\u534f\u7a0b\u662f\u8ba1\u7b97\u5bc6\u96c6\u578b\u7684\uff0c\u6d88\u8017\u592a\u591a\u7684\u65f6\u95f4\uff0c\u5c31\u6ca1\u6cd5\u53ca\u65f6\u5524\u9192 \u5904\u4e8e sleep \u4e2d\u7684\u534f\u7a0b\u3002<\/p>\n\n\n\n<p>\u64cd\u4f5c\u7cfb\u7edf <code class=\"prettyprint\" >unistd.h<\/code> \u91cc\u9762\u7684 <code>sleep()<\/code> \u6216\u8005 <code>usleep()<\/code> \u51fd\u6570 \u5e94\u8be5\u7c7b\u4f3c\u7684\u95ee\u9898\uff0c\u5982\u679c\u5176\u4ed6\u7ebf\u7a0b\u592a\u8017\u65f6\uff0cCPU\u7206\u6ee1\uff0c\u4f1a\u6ca1\u6cd5\u53ca\u65f6\u5207\u6362\u6765\u5524\u9192 sleep\u4e2d\u7684\u7ebf\u7a0b\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<p>\u7531\u4e8e\u7b14\u8005\u7684\u6c34\u5e73\u6709\u9650\uff0c \u52a0\u4e4b\u7f16\u5199\u7684\u540c\u65f6\u8fd8\u8981\u53c2\u4e0e\u5f00\u53d1\u5de5\u4f5c\uff0c\u6587\u4e2d\u96be\u514d\u4f1a\u51fa\u73b0\u4e00\u4e9b\u9519\u8bef\u6216\u8005\u4e0d\u51c6\u786e\u7684\u5730\u65b9\uff0c\u6073\u8bf7\u8bfb\u8005\u6279\u8bc4\u6307\u6b63\u3002\u5982\u679c\u8bfb\u8005\u6709\u4efb\u4f55\u5b9d\u8d35\u610f\u89c1\uff0c\u53ef\u4ee5\u52a0\u6211\u5fae\u4fe1 Loken1\u3002QQ\uff1a2338195090\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7531\u4e8e ST \u5e93\u662f\u5355\u7ebf\u7a0b\u7a0b\u5e8f\uff0c\u5982\u679c\u4f7f\u7528\u4e86 unistd.h \u91cc\u9762\u7684 sleep() \u6216\u8005 usleep() \u51fd\u6570 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[],"class_list":["post-1306","post","type-post","status-publish","format-standard","hentry","category-state-thread-analysis"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>ST\u6e90\u7801\u5206\u6790-st_usleep - \u5f26\u5916\u4e4b\u97f3<\/title>\n<meta name=\"description\" content=\"ST\u6e90\u7801\u5206\u6790-st_usleep\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.xianwaizhiyin.net\/?p=1306\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ST\u6e90\u7801\u5206\u6790-st_usleep - \u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"og:description\" content=\"ST\u6e90\u7801\u5206\u6790-st_usleep\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.xianwaizhiyin.net\/?p=1306\" \/>\n<meta property=\"og:site_name\" content=\"\u5f26\u5916\u4e4b\u97f3\" \/>\n<meta property=\"article:published_time\" content=\"2022-03-09T08:07:07+00:00\" 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