{"id":66999,"date":"2026-01-28T00:24:34","date_gmt":"2026-01-27T16:24:34","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/66999.html"},"modified":"2026-01-28T00:24:34","modified_gmt":"2026-01-27T16:24:34","slug":"%e3%80%90c-%e8%af%ad%e8%a8%80%e5%85%ab%e8%82%a1%e6%96%87%e3%80%91volatile-%e5%85%b3%e9%94%ae%e5%ad%97-%e5%ba%95%e5%b1%82%e5%8e%9f%e7%90%86-%e5%ae%9e%e6%88%98%e5%9c%ba%e6%99%af-%e9%9d%a2%e8%af%95","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/66999.html","title":{"rendered":"\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011volatile \u5173\u952e\u5b57 - \u5e95\u5c42\u539f\u7406 + \u5b9e\u6218\u573a\u666f + \u9762\u8bd5\u771f\u9898\uff0c\u4e00\u7bc7\u641e\u61c2"},"content":{"rendered":"<h2>\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011\u7cfb\u5217\u6587\u7ae0\u76ee\u5f55<\/h2>\n<h3>\u7b2c\u4e00\u7ae0 static \u5173\u952e\u5b57 &#8211; \u5185\u5b58 &#043; \u7528\u6cd5 &#043; \u9762\u8bd5\u9898&#xff0c;\u4e00\u7bc7\u5403\u900f<\/h3>\n<h3>\u7b2c\u4e8c\u7ae0 volatile \u5173\u952e\u5b57 &#8211; \u5e95\u5c42\u539f\u7406 &#043; \u5b9e\u6218\u573a\u666f &#043; \u9762\u8bd5\u771f\u9898&#xff0c;\u4e00\u7bc7\u641e\u61c2<\/h3>\n<hr \/>\n<h4>\u6587\u7ae0\u76ee\u5f55<\/h4>\n<ul>\n<li>\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011\u7cfb\u5217\u6587\u7ae0\u76ee\u5f55<\/li>\n<li>\n<ul>\n<li>\u7b2c\u4e00\u7ae0 static \u5173\u952e\u5b57 &#8211; \u5185\u5b58 &#043; \u7528\u6cd5 &#043; \u9762\u8bd5\u9898&#xff0c;\u4e00\u7bc7\u5403\u900f<\/li>\n<li>\u7b2c\u4e8c\u7ae0 volatile \u5173\u952e\u5b57 &#8211; \u5e95\u5c42\u539f\u7406 &#043; \u5b9e\u6218\u573a\u666f &#043; \u9762\u8bd5\u771f\u9898&#xff0c;\u4e00\u7bc7\u641e\u61c2<\/li>\n<\/ul>\n<\/li>\n<li>\u524d\u8a00<\/li>\n<li>\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49 &amp; \u672c\u8d28<\/li>\n<li>\n<ul>\n<li>\u5b9a\u4e49&#xff1a;<\/li>\n<li>\u672c\u8d28<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001\u6838\u5fc3\u7528\u6cd5&#xff08;\u5206\u70b9 &#043; \u4ee3\u7801\u793a\u4f8b&#xff09;<\/li>\n<li>\n<ul>\n<li>\u7528\u6cd5 1&#xff1a;\u8bbf\u95ee\u786c\u4ef6\u5bc4\u5b58\u5668&#xff08;\u5d4c\u5165\u5f0f\u5f00\u53d1\u6838\u5fc3\u573a\u666f&#xff09;<\/li>\n<li>\u7528\u6cd5 2&#xff1a;\u4e2d\u65ad\u670d\u52a1\u51fd\u6570\u4e0e\u4e3b\u51fd\u6570\u5171\u4eab\u53d8\u91cf<\/li>\n<li>\u7528\u6cd5 3&#xff1a;\u591a\u7ebf\u7a0b\u5171\u4eab\u53d8\u91cf&#xff08;\u57fa\u7840\u573a\u666f&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001\u9762\u8bd5\u9ad8\u9891\u8003\u70b9&#xff08;\u95ee\u6cd5 &#043; \u6807\u51c6\u7b54\u6848&#xff09;<\/li>\n<li>\n<ul>\n<li>\u57fa\u7840\u9898<\/li>\n<li>\n<ul>\n<li>\u95ee\u6cd5 1&#xff1a;volatile\u7684\u4f5c\u7528\u662f\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u95ee\u6cd5 2&#xff1a;volatile\u548cconst\u80fd\u5426\u540c\u65f6\u4fee\u9970\u4e00\u4e2a\u53d8\u91cf&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u8fdb\u9636\u9898<\/li>\n<li>\n<ul>\n<li>\u95ee\u6cd5 1&#xff1a;volatile\u80fd\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u5417&#xff1f;\u4e3a\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u95ee\u6cd5 2&#xff1a;\u7f16\u8bd1\u5668\u5bf9\u666e\u901a\u53d8\u91cf\u7684\u4f18\u5316\u6709\u54ea\u4e9b&#xff1f;volatile\u5982\u4f55\u963b\u6b62\u8fd9\u4e9b\u4f18\u5316&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u5751\u9898<\/li>\n<li>\n<ul>\n<li>\u95ee\u6cd5 1&#xff1a;\u4ee5\u4e0b\u4ee3\u7801\u4e2d&#xff0c;volatile\u662f\u5426\u5fc5\u8981&#xff1f;\u4e3a\u4ec0\u4e48&#xff1f;<\/li>\n<li>\u7528volatile\u4fee\u9970\u7684\u53d8\u91cf&#xff0c;\u80fd\u5426\u88ab\u7f16\u8bd1\u5668\u4f18\u5316\u6389&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u56db\u3001\u5e38\u89c1\u8bef\u533a &amp; \u907f\u5751<\/li>\n<li>\n<ul>\n<li>\u8bef\u533a 1&#xff1a;\u8ba4\u4e3avolatile\u80fd\u66ff\u4ee3\u9501&#xff08;\u591a\u7ebf\u7a0b\u573a\u666f&#xff09;<\/li>\n<li>\u8bef\u533a 2&#xff1a;\u6ee5\u7528volatile&#xff0c;\u6240\u6709\u53d8\u91cf\u90fd\u52a0\u4fee\u9970<\/li>\n<li>\u8bef\u533a 3&#xff1a;\u8ba4\u4e3avolatile\u53d8\u91cf\u7684\u8d4b\u503c\u662f\u539f\u5b50\u7684<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001\u603b\u7ed3 &amp; \u8bb0\u5fc6\u53e3\u8bc0<\/li>\n<li>\n<ul>\n<li>\u6838\u5fc3\u603b\u7ed3&#xff1a;<\/li>\n<li>\u8bb0\u5fc6\u53e3\u8bc0<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001\u62d3\u5c55\u601d\u8003<\/li>\n<\/ul>\n<hr \/>\n<h2>\u524d\u8a00<\/h2>\n<p>\u5728 C \u8bed\u8a00\u9762\u8bd5\u4e2d&#xff0c;volatile\u662f\u6bd4static\u66f4 \u201c\u62c9\u5dee\u8ddd\u201d \u7684\u8003\u70b9 \u2014\u2014 \u57fa\u7840\u5c97\u4f4d\u53ef\u80fd\u53ea\u95ee\u5b9a\u4e49&#xff0c;\u5d4c\u5165\u5f0f \/ \u5e95\u5c42\u5f00\u53d1\u5c97\u4f4d\u4f1a\u6df1\u6316\u5b9e\u6218\u573a\u666f&#xff0c;\u5f88\u591a\u521d\u5b66\u8005\u751a\u81f3\u6ca1\u542c\u8fc7\u8fd9\u4e2a\u5173\u952e\u5b57&#xff0c;\u6216\u8005\u53ea\u80cc\u4e00\u53e5 \u201c\u9632\u6b62\u7f16\u8bd1\u5668\u4f18\u5316\u201d&#xff0c;\u4f46\u8bf4\u4e0d\u6e05 \u201c\u4f18\u5316\u4e86\u4ec0\u4e48\u201d\u201c\u4e3a\u4ec0\u4e48\u8981\u9632\u6b62\u201d\u201c\u54ea\u4e9b\u573a\u666f\u5fc5\u987b\u7528\u201d\u3002\u8fd9\u7bc7\u6587\u7ae0\u4f1a\u4ecevolatile\u7684\u5e95\u5c42\u672c\u8d28\u51fa\u53d1&#xff0c;\u7ed3\u5408\u786c\u4ef6\u4ea4\u4e92\u3001\u591a\u7ebf\u7a0b\u7b49\u6838\u5fc3\u573a\u666f&#xff0c;\u62c6\u89e3\u7528\u6cd5\u548c\u9762\u8bd5\u8003\u70b9&#xff0c;\u5e2e\u4f60\u5f7b\u5e95\u641e\u61c2\u8fd9\u4e2a \u201c\u5d4c\u5165\u5f0f\u9762\u8bd5\u5fc5\u95ee\u201d \u7684\u5173\u952e\u5b57\u3002<\/p>\n<hr \/>\n<h2>\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49 &amp; \u672c\u8d28<\/h2>\n<h3>\u5b9a\u4e49&#xff1a;<\/h3>\n<p>volatile&#xff08;\u6613\u53d8\u7684&#xff09;\u662f C \u8bed\u8a00\u7684\u7c7b\u578b\u9650\u5b9a\u7b26&#xff08;type qualifier&#xff09;&#xff0c;\u7528\u4e8e\u544a\u8bc9\u7f16\u8bd1\u5668&#xff1a;\u201c\u88ab\u4fee\u9970\u7684\u53d8\u91cf\u53ef\u80fd\u4f1a\u88ab\u7a0b\u5e8f\u5916\u7684\u56e0\u7d20&#xff08;\u5982\u786c\u4ef6\u3001\u4e2d\u65ad\u3001\u5176\u4ed6\u7ebf\u7a0b&#xff09;\u610f\u5916\u4fee\u6539&#xff0c;\u7f16\u8bd1\u5668\u7981\u6b62\u5bf9\u8be5\u53d8\u91cf\u505a\u4efb\u4f55\u4f18\u5316&#xff0c;\u5fc5\u987b\u6bcf\u6b21\u90fd\u4ece\u5185\u5b58\u4e2d\u8bfb\u53d6 \/ \u5199\u5165&#xff0c;\u800c\u975e\u5bc4\u5b58\u5668\u3002\u201d<\/p>\n<h3>\u672c\u8d28<\/h3>\n<li>\u6253\u7834\u7f16\u8bd1\u5668\u7684 \u201c\u5185\u5b58 &#8211; \u5bc4\u5b58\u5668\u201d \u4f18\u5316\u903b\u8f91&#xff1a;\u666e\u901a\u53d8\u91cf\u88ab\u8bfb\u53d6\u540e&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u628a\u503c\u6682\u5b58\u5230\u5bc4\u5b58\u5668&#xff08;\u51cf\u5c11\u5185\u5b58\u8bbf\u95ee&#xff09;&#xff0c;\u540e\u7eed\u64cd\u4f5c\u76f4\u63a5\u7528\u5bc4\u5b58\u5668\u7684\u503c&#xff1b;volatile\u53d8\u91cf\u5f3a\u5236\u6bcf\u6b21\u64cd\u4f5c\u90fd\u76f4\u63a5\u8bbf\u95ee\u5185\u5b58\u3002<\/li>\n<li>\u65e0\u539f\u5b50\u6027 \/ \u7ebf\u7a0b\u5b89\u5168\u4fdd\u8bc1&#xff1a;volatile\u4ec5\u7ba1 \u201c\u5185\u5b58\u8bbf\u95ee\u201d&#xff0c;\u4e0d\u7ba1 \u201c\u591a\u7ebf\u7a0b\u7ade\u4e89\u201d&#xff0c;\u8fd9\u662f\u9762\u8bd5\u4e2d\u6700\u6613\u8e29\u5751\u7684\u70b9\u3002<\/li>\n<h2>\u4e8c\u3001\u6838\u5fc3\u7528\u6cd5&#xff08;\u5206\u70b9 &#043; \u4ee3\u7801\u793a\u4f8b&#xff09;<\/h2>\n<h3>\u7528\u6cd5 1&#xff1a;\u8bbf\u95ee\u786c\u4ef6\u5bc4\u5b58\u5668&#xff08;\u5d4c\u5165\u5f0f\u5f00\u53d1\u6838\u5fc3\u573a\u666f&#xff09;<\/h3>\n<p>\u4f5c\u7528&#xff1a;\u786c\u4ef6\u5bc4\u5b58\u5668&#xff08;\u5982\u4e32\u53e3\u3001\u5b9a\u65f6\u5668\u3001GPIO \u5bc4\u5b58\u5668&#xff09;\u7684\u503c\u53ef\u80fd\u88ab\u786c\u4ef6\u81ea\u52a8\u4fee\u6539&#xff08;\u800c\u975e\u7a0b\u5e8f\u4ee3\u7801&#xff09;&#xff0c;\u5fc5\u987b\u7528volatile\u7981\u6b62\u7f16\u8bd1\u5668\u4f18\u5316&#xff0c;\u786e\u4fdd\u6bcf\u6b21\u8bfb\u53d6\u90fd\u662f\u5bc4\u5b58\u5668\u7684\u771f\u5b9e\u503c\u3002<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdint.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5047\u8bbe0x40010800\u662fSTM32\u7684GPIOA\u6570\u636e\u5bc4\u5b58\u5668\u5730\u5740<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">define<\/span> <span class=\"token macro-name\">GPIOA_DATA_REG<\/span> <span class=\"token expression\"><span class=\"token punctuation\">(<\/span><span class=\"token operator\">*<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">volatile<\/span> <span class=\"token class-name\">uint32_t<\/span> <span class=\"token operator\">*<\/span><span class=\"token punctuation\">)<\/span><span class=\"token number\">0x40010800<\/span><span class=\"token punctuation\">)<\/span> <\/span><\/span><\/p>\n<p><span class=\"token keyword\">void<\/span> <span class=\"token function\">read_gpio_status<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u573a\u666f&#xff1a;GPIOA_DATA_REG\u7684\u503c\u7531\u786c\u4ef6&#xff08;\u5916\u90e8\u7535\u8def&#xff09;\u5b9e\u65f6\u4fee\u6539<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> status1 <span class=\"token operator\">&#061;<\/span> GPIOA_DATA_REG<span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u5fc5\u987b\u4ece\u5185\u5b58&#xff08;\u5bc4\u5b58\u5668\u5730\u5740&#xff09;\u8bfb\u771f\u5b9e\u503c<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5982\u679c\u4e0d\u52a0volatile&#xff0c;\u7f16\u8bd1\u5668\u53ef\u80fd\u4f18\u5316\u4e3a&#xff1a;status2 &#061; status1&#xff08;\u76f4\u63a5\u7528\u5bc4\u5b58\u5668\u7f13\u5b58\u503c&#xff09;<\/span><br \/>\n    <span class=\"token class-name\">uint32_t<\/span> status2 <span class=\"token operator\">&#061;<\/span> GPIOA_DATA_REG<span class=\"token punctuation\">;<\/span> <\/p>\n<p>    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>status1 <span class=\"token operator\">!&#061;<\/span> status2<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;GPIO\u72b6\u6001\u53d1\u751f\u53d8\u5316\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u8bf4\u660e&#xff1a;\u786c\u4ef6\u5bc4\u5b58\u5668\u7684\u7269\u7406\u5730\u5740\u5bf9\u5e94\u5185\u5b58\u5730\u5740&#xff0c;\u5176\u503c\u4e0d\u53d7\u7a0b\u5e8f\u63a7\u5236&#xff0c;\u82e5\u4e0d\u52a0volatile&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u8ba4\u4e3a \u201c\u8fde\u7eed\u4e24\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u5730\u5740\u7684\u503c\u4e0d\u4f1a\u53d8\u201d&#xff0c;\u4ece\u800c\u4f18\u5316\u6389\u7b2c\u4e8c\u6b21\u8bfb\u53d6&#xff0c;\u5bfc\u81f4\u7a0b\u5e8f\u8bfb\u53d6\u5230\u9519\u8bef\u7684\u7f13\u5b58\u503c\u3002<\/p>\n<h3>\u7528\u6cd5 2&#xff1a;\u4e2d\u65ad\u670d\u52a1\u51fd\u6570\u4e0e\u4e3b\u51fd\u6570\u5171\u4eab\u53d8\u91cf<\/h3>\n<p>\u4f5c\u7528&#xff1a;\u4e2d\u65ad\u670d\u52a1\u51fd\u6570&#xff08;ISR&#xff09;\u4f1a\u5f02\u6b65\u4fee\u6539\u53d8\u91cf&#xff0c;\u4e3b\u51fd\u6570\u8bfb\u53d6\u8be5\u53d8\u91cf\u65f6&#xff0c;\u5fc5\u987b\u7528volatile\u786e\u4fdd\u8bfb\u53d6\u7684\u662f\u6700\u65b0\u503c&#xff08;\u800c\u975e\u7f16\u8bd1\u5668\u7f13\u5b58\u7684\u65e7\u503c&#xff09;\u3002<\/p>\n<p>\u4ee3\u7801\u5982\u4e0b&#xff08;\u793a\u4f8b&#xff09;&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;signal.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u5168\u5c40\u53d8\u91cf&#xff1a;\u88ab\u4e2d\u65ad\u51fd\u6570\u4fee\u6539&#xff0c;\u4e3b\u51fd\u6570\u8bfb\u53d6<\/span><br \/>\n<span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> interrupt_flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p><span class=\"token comment\">\/\/ \u6a21\u62df\u4e2d\u65ad\u670d\u52a1\u51fd\u6570&#xff08;\u7528SIGINT\u4fe1\u53f7\u6a21\u62df&#xff09;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">sigint_handler<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> signum<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    interrupt_flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u4e2d\u65ad\u89e6\u53d1\u65f6\u4fee\u6539\u6807\u5fd7\u4f4d<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e2d\u65ad\u89e6\u53d1&#xff0c;flag\u7f6e1\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">signal<\/span><span class=\"token punctuation\">(<\/span>SIGINT<span class=\"token punctuation\">,<\/span> sigint_handler<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6ce8\u518c\u4fe1\u53f7\u5904\u7406\u51fd\u6570&#xff08;\u6a21\u62df\u4e2d\u65ad&#xff09;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u6309Ctrl&#043;C\u89e6\u53d1\u4e2d\u65ad&#8230;\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u82e5\u4e0d\u52a0volatile&#xff0c;\u7f16\u8bd1\u5668\u4f1a\u4f18\u5316\u4e3a&#xff1a;if(0)&#xff08;\u56e0\u4e3a\u8ba4\u4e3aflag\u4e0d\u4f1a\u53d8&#xff09;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>interrupt_flag<span class=\"token punctuation\">)<\/span><br \/>\n        <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e3b\u51fd\u6570\u68c0\u6d4b\u5230\u4e2d\u65ad&#xff0c;flag&#061;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> interrupt_flag<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n            interrupt_flag <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u91cd\u7f6e\u6807\u5fd7\u4f4d<\/span><br \/>\n            <span class=\"token keyword\">break<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u8bf4\u660e&#xff1a;\u4e2d\u65ad\u51fd\u6570\u662f\u5f02\u6b65\u6267\u884c\u7684&#xff0c;\u4e3b\u51fd\u6570\u7684while\u5faa\u73af\u4e2d&#xff0c;\u7f16\u8bd1\u5668\u82e5\u53d1\u73b0 \u201c\u6ca1\u6709\u4ee3\u7801\u4fee\u6539 interrupt_flag\u201d&#xff0c;\u4f1a\u5c06\u5176\u4f18\u5316\u4e3a\u5e38\u91cf 0&#xff0c;\u5bfc\u81f4\u5faa\u73af\u6c38\u8fdc\u65e0\u6cd5\u9000\u51fa&#xff1b;volatile\u5f3a\u5236\u7f16\u8bd1\u5668\u6bcf\u6b21\u90fd\u4ece\u5185\u5b58\u8bfb\u53d6 flag \u7684\u503c\u3002<\/p>\n<h3>\u7528\u6cd5 3&#xff1a;\u591a\u7ebf\u7a0b\u5171\u4eab\u53d8\u91cf&#xff08;\u57fa\u7840\u573a\u666f&#xff09;<\/h3>\n<p>\u4f5c\u7528&#xff1a;\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b&#xff0c;\u4e00\u4e2a\u7ebf\u7a0b\u4fee\u6539\u53d8\u91cf&#xff0c;\u53e6\u4e00\u4e2a\u7ebf\u7a0b\u8bfb\u53d6\u65f6&#xff0c;volatile\u786e\u4fdd\u8bfb\u53d6\u5230\u5185\u5b58\u4e2d\u7684\u6700\u65b0\u503c&#xff08;\u800c\u975e CPU \u7f13\u5b58 \/ \u5bc4\u5b58\u5668\u7684\u503c&#xff09;\u3002<\/p>\n<p>\u4ee3\u7801\u793a\u4f8b&#xff08;Linux \u591a\u7ebf\u7a0b\u7b80\u5316\u7248&#xff09;&#xff1a;<\/p>\n<p><span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;stdio.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;pthread.h&gt;<\/span><\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;unistd.h&gt;<\/span><\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u591a\u7ebf\u7a0b\u5171\u4eab\u53d8\u91cf&#xff1a;\u5fc5\u987b\u52a0volatile<\/span><br \/>\n<span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> thread_running <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p><span class=\"token comment\">\/\/ \u5b50\u7ebf\u7a0b\u51fd\u6570<\/span><br \/>\n<span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> <span class=\"token function\">worker_thread<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">void<\/span><span class=\"token operator\">*<\/span> arg<span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u82e5\u4e0d\u52a0volatile&#xff0c;\u7f16\u8bd1\u5668\u53ef\u80fd\u4f18\u5316\u4e3a\u6b7b\u5faa\u73af&#xff08;\u8ba4\u4e3athread_running\u6c38\u8fdc\u4e3a1&#xff09;<\/span><br \/>\n    <span class=\"token keyword\">while<\/span> <span class=\"token punctuation\">(<\/span>thread_running<span class=\"token punctuation\">)<\/span><br \/>\n    <span class=\"token punctuation\">{<\/span><br \/>\n        count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u5b50\u7ebf\u7a0b\u9000\u51fa&#xff0c;\u7d2f\u8ba1\u8ba1\u6570&#xff1a;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> count<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token keyword\">int<\/span> <span class=\"token function\">main<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">pthread_t<\/span> tid<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">pthread_create<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">,<\/span> worker_thread<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">sleep<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8ba9\u5b50\u7ebf\u7a0b\u8fd0\u884c2\u79d2<\/span><br \/>\n    thread_running <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u901a\u77e5\u5b50\u7ebf\u7a0b\u9000\u51fa<\/span><br \/>\n    <span class=\"token function\">pthread_join<\/span><span class=\"token punctuation\">(<\/span>tid<span class=\"token punctuation\">,<\/span> <span class=\"token constant\">NULL<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;\u4e3b\u7ebf\u7a0b\u9000\u51fa\\\\n&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u5173\u952e\u8bf4\u660e&#xff1a;volatile\u4ec5\u4fdd\u8bc1 \u201c\u53ef\u89c1\u6027\u201d&#xff08;\u8bfb\u53d6\u6700\u65b0\u503c&#xff09;&#xff0c;\u4f46\u4e0d\u4fdd\u8bc1\u539f\u5b50\u6027&#xff08;\u5982thread_running&#043;&#043;\u8fd9\u7c7b\u590d\u5408\u64cd\u4f5c\u4ecd\u4f1a\u6709\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898&#xff09;&#xff0c;\u8fd9\u662f\u9762\u8bd5\u9ad8\u9891\u6613\u9519\u70b9\u3002<\/p>\n<hr \/>\n<h2>\u4e09\u3001\u9762\u8bd5\u9ad8\u9891\u8003\u70b9&#xff08;\u95ee\u6cd5 &#043; \u6807\u51c6\u7b54\u6848&#xff09;<\/h2>\n<h3>\u57fa\u7840\u9898<\/h3>\n<h4>\u95ee\u6cd5 1&#xff1a;volatile\u7684\u4f5c\u7528\u662f\u4ec0\u4e48&#xff1f;<\/h4>\n<p>\u7b54&#xff1a; \u6838\u5fc3\u4f5c\u7528\u662f\u7981\u6b62\u7f16\u8bd1\u5668\u5bf9\u53d8\u91cf\u8fdb\u884c\u4f18\u5316&#xff0c;\u5f3a\u5236\u7a0b\u5e8f\u6bcf\u6b21\u8bbf\u95ee\u8be5\u53d8\u91cf\u65f6\u90fd\u76f4\u63a5\u4ece\u5185\u5b58\u8bfb\u53d6 \/ \u5199\u5165&#xff0c;\u800c\u975e\u4f7f\u7528\u5bc4\u5b58\u5668\u4e2d\u7684\u7f13\u5b58\u503c\u3002\u5176\u672c\u8d28\u662f\u544a\u8bc9\u7f16\u8bd1\u5668&#xff1a;\u8be5\u53d8\u91cf\u7684\u503c\u53ef\u80fd\u88ab\u7a0b\u5e8f\u5916\u90e8\u56e0\u7d20&#xff08;\u786c\u4ef6\u3001\u4e2d\u65ad\u3001\u5176\u4ed6\u7ebf\u7a0b&#xff09;\u4fee\u6539&#xff0c;\u4e0d\u80fd\u5047\u8bbe\u5176\u503c\u4e0d\u53d8\u3002<\/p>\n<h4>\u95ee\u6cd5 2&#xff1a;volatile\u548cconst\u80fd\u5426\u540c\u65f6\u4fee\u9970\u4e00\u4e2a\u53d8\u91cf&#xff1f;<\/h4>\n<p>\u7b54&#xff1a; \u53ef\u4ee5&#xff01;\u4f8b\u5982volatile const uint32_t *GPIO_REG;&#xff0c;\u8868\u793a \u201c\u8be5\u5bc4\u5b58\u5668\u7684\u503c\u662f\u53ea\u8bfb\u7684&#xff08;const&#xff09;&#xff0c;\u4f46\u53ef\u80fd\u88ab\u786c\u4ef6\u4fee\u6539&#xff08;volatile&#xff09;\u201d&#xff0c;\u5e38\u89c1\u4e8e\u5d4c\u5165\u5f0f\u4e2d\u53ea\u8bfb\u786c\u4ef6\u5bc4\u5b58\u5668\u7684\u5b9a\u4e49\u3002<\/p>\n<h3>\u8fdb\u9636\u9898<\/h3>\n<h4>\u95ee\u6cd5 1&#xff1a;volatile\u80fd\u4fdd\u8bc1\u7ebf\u7a0b\u5b89\u5168\u5417&#xff1f;\u4e3a\u4ec0\u4e48&#xff1f;<\/h4>\n<p>\u7b54&#xff1a; \u4e0d\u80fd&#xff01;volatile\u4ec5\u4fdd\u8bc1\u53ef\u89c1\u6027&#xff08;\u53d8\u91cf\u4fee\u6539\u540e\u5176\u4ed6\u7ebf\u7a0b\u80fd\u7acb\u523b\u770b\u5230&#xff09;&#xff0c;\u4f46\u4e0d\u4fdd\u8bc1\u539f\u5b50\u6027\u548c\u6709\u5e8f\u6027&#xff1a; \u2460 \u539f\u5b50\u6027&#xff1a;\u5982volatile int a &#061; a &#043; 1;&#xff0c;\u7f16\u8bd1\u540e\u662f \u201c\u8bfb &#8211; \u52a0 &#8211; \u5199\u201d \u4e09\u6b65\u64cd\u4f5c&#xff0c;\u591a\u7ebf\u7a0b\u6267\u884c\u65f6\u4ecd\u4f1a\u51fa\u73b0\u7ade\u6001\u6761\u4ef6&#xff1b; \u2461 \u6709\u5e8f\u6027&#xff1a;volatile\u65e0\u6cd5\u7981\u6b62 CPU \u7684\u6307\u4ee4\u91cd\u6392&#xff0c;\u590d\u6742\u573a\u666f\u4ecd\u9700\u5185\u5b58\u5c4f\u969c \/ \u4e92\u65a5\u9501\u3002<\/p>\n<h4>\u95ee\u6cd5 2&#xff1a;\u7f16\u8bd1\u5668\u5bf9\u666e\u901a\u53d8\u91cf\u7684\u4f18\u5316\u6709\u54ea\u4e9b&#xff1f;volatile\u5982\u4f55\u963b\u6b62\u8fd9\u4e9b\u4f18\u5316&#xff1f;<\/h4>\n<p>\u7b54&#xff1a; \u5e38\u89c1\u4f18\u5316&#xff1a; \u2460 \u7f13\u5b58\u4f18\u5316&#xff08;\u5c06\u53d8\u91cf\u503c\u6682\u5b58\u5bc4\u5b58\u5668&#xff0c;\u51cf\u5c11\u5185\u5b58\u8bbf\u95ee&#xff09;&#xff1b; \u2461 \u6b7b\u4ee3\u7801\u6d88\u9664&#xff08;\u8ba4\u4e3a\u53d8\u91cf\u503c\u4e0d\u53d8&#xff0c;\u5220\u9664\u65e0\u7528\u8bfb\u53d6&#xff09;&#xff1b; \u2462 \u5faa\u73af\u4f18\u5316&#xff08;\u5c06\u5faa\u73af\u5185\u7684\u53d8\u91cf\u8bfb\u53d6\u63d0\u5230\u5faa\u73af\u5916&#xff09;\u3002 volatile\u901a\u8fc7\u544a\u8bc9\u7f16\u8bd1\u5668 \u201c\u53d8\u91cf\u6613\u53d8\u201d&#xff0c;\u5f3a\u5236\u6bcf\u6b21\u64cd\u4f5c\u90fd\u8bbf\u95ee\u5185\u5b58&#xff0c;\u76f4\u63a5\u963b\u65ad\u8fd9\u4e9b\u4f18\u5316\u3002<\/p>\n<h3>\u5751\u9898<\/h3>\n<h4>\u95ee\u6cd5 1&#xff1a;\u4ee5\u4e0b\u4ee3\u7801\u4e2d&#xff0c;volatile\u662f\u5426\u5fc5\u8981&#xff1f;\u4e3a\u4ec0\u4e48&#xff1f;<\/h4>\n<p><span class=\"token keyword\">int<\/span> a <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">10<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token function\">printf<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;%d\\\\n&#034;<\/span><span class=\"token punctuation\">,<\/span> a<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>\u7b54&#xff1a; \u4e0d\u5fc5\u8981&#xff01;\u56e0\u4e3a\u53d8\u91cfa\u7684\u503c\u4ec5\u7531\u7a0b\u5e8f\u4ee3\u7801\u63a7\u5236&#xff0c;\u6ca1\u6709\u5916\u90e8\u56e0\u7d20\u4fee\u6539&#xff0c;\u7f16\u8bd1\u5668\u7684\u4f18\u5316&#xff08;\u5982\u7f13\u5b58 a \u7684\u503c\u5230\u5bc4\u5b58\u5668&#xff09;\u4e0d\u4f1a\u5bfc\u81f4\u9519\u8bef&#xff0c;\u52a0volatile\u53cd\u800c\u4f1a\u964d\u4f4e\u6027\u80fd\u3002<\/p>\n<h4>\u7528volatile\u4fee\u9970\u7684\u53d8\u91cf&#xff0c;\u80fd\u5426\u88ab\u7f16\u8bd1\u5668\u4f18\u5316\u6389&#xff1f;<\/h4>\n<p>\u7b54&#xff1a; \u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u4e0d\u4f1a&#xff0c;\u4f46\u6781\u7aef\u573a\u666f&#xff08;\u5982\u53d8\u91cf\u5b9a\u4e49\u540e\u4ece\u672a\u88ab\u5916\u90e8\u8bbf\u95ee&#xff09;\u4ecd\u53ef\u80fd\u88ab\u4f18\u5316&#xff08;\u9700\u7ed3\u5408\u7f16\u8bd1\u5668\u9009\u9879&#xff09;&#xff1b;\u6838\u5fc3\u539f\u5219&#xff1a;\u4ec5\u5728 \u201c\u53d8\u91cf\u53ef\u80fd\u88ab\u5916\u90e8\u4fee\u6539\u201d \u65f6\u4f7f\u7528volatile&#xff0c;\u4e0d\u8981\u6ee5\u7528\u3002<\/p>\n<h2>\u56db\u3001\u5e38\u89c1\u8bef\u533a &amp; \u907f\u5751<\/h2>\n<h3>\u8bef\u533a 1&#xff1a;\u8ba4\u4e3avolatile\u80fd\u66ff\u4ee3\u9501&#xff08;\u591a\u7ebf\u7a0b\u573a\u666f&#xff09;<\/h3>\n<p>\u9519\u8bef\u8ba4\u77e5&#xff1a;\u591a\u7ebf\u7a0b\u4e2d\u7528volatile\u4fee\u9970\u5171\u4eab\u53d8\u91cf&#xff0c;\u5c31\u4e0d\u9700\u8981\u4e92\u65a5\u9501\u4e86\u3002 \u7ea0\u6b63&#xff1a;volatile\u4e0d\u4fdd\u8bc1\u539f\u5b50\u6027&#xff0c;\u590d\u5408\u64cd\u4f5c&#xff08;\u5982i&#043;&#043;\u3001i &#043;&#061; 2&#xff09;\u4ecd\u4f1a\u51fa\u73b0\u7ebf\u7a0b\u5b89\u5168\u95ee\u9898\u3002<\/p>\n<p>\u793a\u4f8b<\/p>\n<p><span class=\"token comment\">\/\/ \u9519\u8bef\u793a\u4f8b&#xff1a;\u591a\u7ebf\u7a0b\u6267\u884c\u8be5\u51fd\u6570&#xff0c;\u7ed3\u679c\u4f1a\u5c0f\u4e8e\u9884\u671f<\/span><br \/>\n<span class=\"token keyword\">volatile<\/span> <span class=\"token keyword\">int<\/span> count <span class=\"token operator\">&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">add_count<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u975e\u539f\u5b50\u64cd\u4f5c&#xff1a;\u8bfbcount\u2192\u52a01\u2192\u5199count<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token comment\">\/\/ \u6b63\u786e\u505a\u6cd5&#xff1a;\u52a0\u4e92\u65a5\u9501<\/span><br \/>\n<span class=\"token macro property\"><span class=\"token directive-hash\">#<\/span><span class=\"token directive keyword\">include<\/span> <span class=\"token string\">&lt;pthread_mutex.h&gt;<\/span><\/span><br \/>\n<span class=\"token class-name\">pthread_mutex_t<\/span> mutex <span class=\"token operator\">&#061;<\/span> PTHREAD_MUTEX_INITIALIZER<span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token keyword\">void<\/span> <span class=\"token function\">add_count_safe<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><br \/>\n<span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token function\">pthread_mutex_lock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    count<span class=\"token operator\">&#043;&#043;<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token function\">pthread_mutex_unlock<\/span><span class=\"token punctuation\">(<\/span><span class=\"token operator\">&amp;<\/span>mutex<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h3>\u8bef\u533a 2&#xff1a;\u6ee5\u7528volatile&#xff0c;\u6240\u6709\u53d8\u91cf\u90fd\u52a0\u4fee\u9970<\/h3>\n<p>\u9519\u8bef\u8ba4\u77e5&#xff1a;\u52a0volatile\u66f4 \u201c\u5b89\u5168\u201d&#xff0c;\u80fd\u907f\u514d\u7f16\u8bd1\u5668\u4f18\u5316\u5bfc\u81f4\u7684\u95ee\u9898\u3002 \u7ea0\u6b63&#xff1a; volatile\u4f1a\u7981\u6b62\u7f16\u8bd1\u5668\u7684\u5408\u7406\u4f18\u5316&#xff0c;\u5bfc\u81f4\u7a0b\u5e8f\u6027\u80fd\u4e0b\u964d&#xff08;\u5185\u5b58\u8bbf\u95ee\u6bd4\u5bc4\u5b58\u5668\u6162&#xff09;\u3002 \u4ec5\u5728\u4ee5\u4e0b\u573a\u666f\u4f7f\u7528&#xff1a; \u2460 \u786c\u4ef6\u5bc4\u5b58\u5668\u8bbf\u95ee&#xff1b; \u2461 \u4e2d\u65ad\u5171\u4eab\u53d8\u91cf&#xff1b; \u2462 \u591a\u7ebf\u7a0b\u5171\u4eab\u53d8\u91cf&#xff08;\u4e14\u9700\u914d\u5408\u9501\u4f7f\u7528&#xff09;\u3002<\/p>\n<h3>\u8bef\u533a 3&#xff1a;\u8ba4\u4e3avolatile\u53d8\u91cf\u7684\u8d4b\u503c\u662f\u539f\u5b50\u7684<\/h3>\n<p>\u9519\u8bef\u8ba4\u77e5&#xff1a;volatile int a &#061; 10;\u662f\u539f\u5b50\u64cd\u4f5c&#xff0c;\u591a\u7ebf\u7a0b\u8d4b\u503c\u4e0d\u4f1a\u6709\u95ee\u9898\u3002 \u7ea0\u6b63&#xff1a;\u5bf9\u4e8eint\u7b49\u57fa\u7840\u7c7b\u578b&#xff08;\u2264CPU \u5b57\u957f&#xff09;&#xff0c;\u5355\u6b21\u8d4b\u503c \/ \u8bfb\u53d6\u901a\u5e38\u662f\u539f\u5b50\u7684&#xff0c;\u4f46volatile\u672c\u8eab\u4e0d\u4fdd\u8bc1\u8fd9\u4e00\u70b9&#xff1b;\u5bf9\u4e8e\u7ed3\u6784\u4f53\u3001\u6570\u7ec4\u7b49\u590d\u6742\u7c7b\u578b&#xff0c;volatile\u4fee\u9970\u540e\u8d4b\u503c\u4ecd\u662f\u975e\u539f\u5b50\u7684\u3002<\/p>\n<h2>\u4e94\u3001\u603b\u7ed3 &amp; \u8bb0\u5fc6\u53e3\u8bc0<\/h2>\n<h3>\u6838\u5fc3\u603b\u7ed3&#xff1a;<\/h3>\n<ul>\n<li>volatile\u7684\u6838\u5fc3&#xff1a;\u7981\u6b62\u7f16\u8bd1\u5668\u4f18\u5316&#xff0c;\u5f3a\u5236\u8bbf\u95ee\u5185\u5b58&#xff0c;\u4fdd\u8bc1\u53ef\u89c1\u6027&#xff1b;<\/li>\n<li>\u6838\u5fc3\u4f7f\u7528\u573a\u666f&#xff1a;\u786c\u4ef6\u5bc4\u5b58\u5668\u3001\u4e2d\u65ad\u5171\u4eab\u53d8\u91cf\u3001\u591a\u7ebf\u7a0b\u5171\u4eab\u53d8\u91cf&#xff1b;<\/li>\n<li>\u5173\u952e\u8fb9\u754c&#xff1a;\u4e0d\u4fdd\u8bc1\u539f\u5b50\u6027\u3001\u4e0d\u66ff\u4ee3\u9501\u3001\u4e0d\u6ee5\u7528&#xff08;\u5426\u5219\u964d\u6027\u80fd&#xff09;\u3002<\/li>\n<\/ul>\n<h3>\u8bb0\u5fc6\u53e3\u8bc0<\/h3>\n<p>volatile \u9632\u4f18\u5316&#xff0c;\u5185\u5b58\u8bfb\u5199\u4e0d\u7f13\u5b58&#xff1b; \u786c\u4ef6\u4e2d\u65ad\u591a\u7ebf\u7a0b&#xff0c;\u8fd9\u4ee8\u573a\u666f\u624d\u8981\u7528&#xff1b; \u539f\u5b50\u5b89\u5168\u9760\u9501\u4fdd&#xff0c;\u522b\u628a\u6613\u53d8\u5f53\u9501\u7528\u3002<\/p>\n<h2>\u516d\u3001\u62d3\u5c55\u601d\u8003<\/h2>\n<ul>\n<li>volatile\u5728 C \u548c C&#043;&#043; \u4e2d\u7684\u5dee\u5f02&#xff1a;C&#043;&#043; \u4e2dvolatile\u7684\u8bed\u4e49\u66f4\u4e25\u683c&#xff0c;\u53ef\u4fee\u9970\u7c7b\u6210\u5458&#xff0c;\u4e14\u7981\u6b62\u5bf9volatile\u5bf9\u8c61\u7684\u51fd\u6570\u8c03\u7528\u4f18\u5316&#xff1b;C \u8bed\u8a00\u4ec5\u7528\u4e8e\u57fa\u7840\u7c7b\u578b\u3002<\/li>\n<li>\u7f16\u8bd1\u5668\u4f18\u5316\u7b49\u7ea7\u5bf9volatile\u7684\u5f71\u54cd&#xff1a;\u5373\u4f7f\u52a0\u4e86volatile&#xff0c;O3&#xff08;\u6700\u9ad8\u4f18\u5316\u7b49\u7ea7&#xff09;\u4e0b\u4ecd\u53ef\u80fd\u6709\u90e8\u5206\u4f18\u5316&#xff0c;\u5d4c\u5165\u5f0f\u5f00\u53d1\u4e2d\u9700\u7ed3\u5408\u7f16\u8bd1\u5668\u624b\u518c\u786e\u8ba4\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011\u7cfb\u5217\u6587\u7ae0\u76ee\u5f55<br \/>\n\u7b2c\u4e00\u7ae0 static \u5173\u952e\u5b57 &#8211; \u5185\u5b58  \u7528\u6cd5  \u9762\u8bd5\u9898&#xff0c;\u4e00\u7bc7\u5403\u900f<br \/>\n\u7b2c\u4e8c\u7ae0 volatile \u5173\u952e\u5b57 &#8211; \u5e95\u5c42\u539f\u7406  \u5b9e\u6218\u573a\u666f  \u9762\u8bd5\u771f\u9898&#xff0c;\u4e00\u7bc7\u641e\u61c2 \u6587\u7ae0\u76ee\u5f55\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011\u7cfb\u5217\u6587\u7ae0\u76ee\u5f55\u7b2c\u4e00\u7ae0 static \u5173\u952e\u5b57 &#8211; \u5185\u5b58  \u7528\u6cd5  \u9762\u8bd5\u9898&#xff0c;\u4e00\u7bc7\u5403\u900f\u7b2c\u4e8c\u7ae0 volatile \u5173\u952e\u5b57 &#8211; \u5e95\u5c42\u539f\u7406  \u5b9e\u6218\u573a\u666f  \u9762\u8bd5\u771f\u9898&#xff0c;\u4e00\u7bc7\u641e\u61c2\u524d\u8a00\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49 &amp; \u672c\u8d28\u5b9a\u4e49&#xff1a;\u672c\u8d28\u4e8c\u3001<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[174,790,76,190,220,925,176],"topic":[],"class_list":["post-66999","post","type-post","status-publish","format-standard","hentry","category-server","tag-c","tag-visual-studio","tag-vscode","tag-190","tag-220","tag-925","tag-176"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011volatile \u5173\u952e\u5b57 - \u5e95\u5c42\u539f\u7406 + \u5b9e\u6218\u573a\u666f + \u9762\u8bd5\u771f\u9898\uff0c\u4e00\u7bc7\u641e\u61c2 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\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.wsisp.com\/helps\/66999.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011volatile \u5173\u952e\u5b57 - \u5e95\u5c42\u539f\u7406 + \u5b9e\u6218\u573a\u666f + \u9762\u8bd5\u771f\u9898\uff0c\u4e00\u7bc7\u641e\u61c2 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011\u7cfb\u5217\u6587\u7ae0\u76ee\u5f55 \u7b2c\u4e00\u7ae0 static \u5173\u952e\u5b57 - \u5185\u5b58 \u7528\u6cd5 \u9762\u8bd5\u9898&#xff0c;\u4e00\u7bc7\u5403\u900f \u7b2c\u4e8c\u7ae0 volatile \u5173\u952e\u5b57 - \u5e95\u5c42\u539f\u7406 \u5b9e\u6218\u573a\u666f \u9762\u8bd5\u771f\u9898&#xff0c;\u4e00\u7bc7\u641e\u61c2 \u6587\u7ae0\u76ee\u5f55\u3010C \u8bed\u8a00\u516b\u80a1\u6587\u3011\u7cfb\u5217\u6587\u7ae0\u76ee\u5f55\u7b2c\u4e00\u7ae0 static \u5173\u952e\u5b57 - \u5185\u5b58 \u7528\u6cd5 \u9762\u8bd5\u9898&#xff0c;\u4e00\u7bc7\u5403\u900f\u7b2c\u4e8c\u7ae0 volatile \u5173\u952e\u5b57 - \u5e95\u5c42\u539f\u7406 \u5b9e\u6218\u573a\u666f \u9762\u8bd5\u771f\u9898&#xff0c;\u4e00\u7bc7\u641e\u61c2\u524d\u8a00\u4e00\u3001\u6838\u5fc3\u5b9a\u4e49 &amp; \u672c\u8d28\u5b9a\u4e49&#xff1a;\u672c\u8d28\u4e8c\u3001\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/66999.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-01-27T16:24:34+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 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