{"id":306937,"date":"2024-05-20T20:22:50","date_gmt":"2024-05-20T12:22:50","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/306937.html"},"modified":"2024-05-20T20:23:17","modified_gmt":"2024-05-20T12:23:17","slug":"c-%e4%b8%ad%e5%8d%95%e4%be%8b%e7%9a%84%e5%86%99%e6%b3%95%e4%b8%ad%e4%b8%ba%e4%bb%80%e4%b9%88%e9%9c%80%e8%a6%81memory_order_acquire","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/306937.html","title":{"rendered":"c \u4e2d\u5355\u4f8b\u7684\u5199\u6cd5\u4e2d\u4e3a\u4ec0\u4e48\u9700\u8981memory_order_acquire"},"content":{"rendered":"

\"c<\/p>\n

\u5f53\u8ba8\u8bbaC++\u4e2d\u5355\u4f8b\u7684\u5199\u6cd5\u65f6\uff0c\u4f7f\u7528memory_order_acquire<\/code>\u662f\u4e3a\u4e86\u4fdd\u8bc1\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u6b63\u786e\u521b\u5efa\u5355\u4f8b\u5b9e\u4f8b\u7684\u540c\u65f6\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u5f00\u9500<\/strong>\u3001\u786e\u4fdd\u521d\u59cb\u5316\u7684\u5b89\u5168\u6027<\/strong>\u548c\u907f\u514d\u6570\u636e\u7ade\u6001<\/strong>\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u5728\u521b\u5efa\u5355\u4f8b\u65f6\uff0c\u6211\u4eec\u5fc5\u987b\u786e\u4fdd\u5355\u4f8b\u5bf9\u8c61\u7684\u521d\u59cb\u5316\u53ea\u53d1\u751f\u4e00\u6b21\uff0c\u5e76\u4e14\u6240\u6709\u7684\u7ebf\u7a0b\u5728\u8bbf\u95ee\u5355\u4f8b\u5bf9\u8c61\u65f6\uff0c\u90fd\u80fd\u770b\u5230\u4e00\u4e2a\u5b8c\u5168\u521d\u59cb\u5316\u7684\u5bf9\u8c61\u3002\u5728\u4f7f\u7528\u539f\u5b50\u64cd\u4f5c\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u65f6\uff0cmemory_order_acquire<\/code>\u80fd\u591f\u9632\u6b62\u7f16\u8bd1\u5668\u548c\u5904\u7406\u5668\u7684\u6307\u4ee4\u91cd\u6392\uff0c\u786e\u4fdd\u521d\u59cb\u5316\u5355\u4f8b\u7684\u6307\u4ee4\u6267\u884c\u5b8c\u6210\u540e\uff0c\u540e\u7eed\u5bf9\u5355\u4f8b\u7684\u8bbf\u95ee\u90fd\u80fd\u770b\u5230\u521d\u59cb\u5316\u5b8c\u6574\u7684\u72b6\u6001\u3002<\/p>\n<\/p>\n

memory_order_acquire<\/code>\u662f\u6307\u539f\u5b50\u64cd\u4f5c\u5728\u8bfb\u53d6\u64cd\u4f5c\u4e0a\u7684\u4e00\u79cd\u201c\u83b7\u53d6\u201d\u5185\u5b58\u987a\u5e8f\uff0c\u5b83\u53ef\u4ee5\u4fdd\u8bc1\u5728\u6b64\u539f\u5b50\u64cd\u4f5c\u8bfb\u53d6\u5b8c\u6bd5\u4e4b\u524d\u7684\u6240\u6709\u5199\u64cd\u4f5c\u90fd\u5c06\u5728\u5176\u4ed6\u7ebf\u7a0b\u4e2d\u53d8\u4e3a\u53ef\u89c1\u3002\u8fd9\u5bf9\u5355\u4f8b\u6a21\u5f0f\u81f3\u5173\u91cd\u8981\uff0c\u56e0\u4e3a\u6211\u4eec\u9700\u8981\u4fdd\u8bc1\u5728\u8fd4\u56de\u5355\u4f8b\u5bf9\u8c61\u5f15\u7528\u6216\u6307\u9488\u4e4b\u524d\uff0c\u5bf9\u8c61\u7684\u6784\u9020\u5df2\u7ecf\u5b8c\u5168\u5b8c\u6210\uff0c\u4ee5\u53ca\u6240\u6709\u5bf9\u5e94\u7684\u5199\u64cd\u4f5c\u90fd\u5df2\u7ecf\u6267\u884c\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u7406\u89e3\u5185\u5b58\u987a\u5e8f\u548c\u539f\u5b50\u64cd\u4f5c<\/h3>\n<\/p>\n

\u5728\u6df1\u5165\u89e3\u91camemory_order_acquire<\/code>\u4e4b\u524d\uff0c\u6211\u4eec\u9700\u8981\u7406\u89e3\u5185\u5b58\u987a\u5e8f\uff08Memory Order\uff09\u548c\u539f\u5b50\u64cd\u4f5c\uff08Atomic Operations\uff09\u3002\u591a\u6838\u5904\u7406\u5668\u548c\u7f16\u8bd1\u5668\u4f18\u5316\u53ef\u80fd\u5bfc\u81f4\u5185\u5b58\u64cd\u4f5c\u7684\u987a\u5e8f\u4e0e\u4ee3\u7801\u4e2d\u7684\u987a\u5e8f\u4e0d\u540c\u3002\u539f\u5b50\u64cd\u4f5c\u662f\u4e00\u79cd\u4e0d\u53ef\u5206\u5272\u7684\u64cd\u4f5c\uff0c\u901a\u5e38\u7528\u4e8e\u5e76\u53d1\u7f16\u7a0b\u4e2d\uff0c\u786e\u4fdd\u67d0\u4e2a\u7ed9\u5b9a\u7684\u53d8\u91cf\u7684\u8bfb\u53d6\u3001\u5199\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u662f\u7ebf\u7a0b\u5b89\u5168\u7684\u3002<\/p>\n<\/p>\n

\u5185\u5b58\u64cd\u4f5c\u7684\u987a\u5e8f<\/h4>\n<\/p>\n

\u5185\u5b58\u987a\u5e8f\u662f\u6307\u5185\u5b58\u64cd\u4f5c\u6267\u884c\u7684\u987a\u5e8f\u3002\u7f16\u8bd1\u5668\u548c\u5904\u7406\u5668\u53ef\u80fd\u5bf9\u6307\u4ee4\u8fdb\u884c\u91cd\u65b0\u6392\u5e8f\u6765\u4f18\u5316\u6027\u80fd\uff0c\u4f46\u8fd9\u53ef\u80fd\u4f1a\u5bfc\u81f4\u591a\u7ebf\u7a0b\u7a0b\u5e8f\u4e2d\u7684\u903b\u8f91\u9519\u8bef\u3002<\/p>\n<\/p>\n

\u539f\u5b50\u64cd\u4f5c<\/h4>\n<\/p>\n

\u539f\u5b50\u64cd\u4f5c\u662f\u786e\u4fdd\u5728\u5e76\u53d1\u73af\u5883\u4e2d\u8fdb\u884c\u8bfb\u53d6\u3001\u5199\u5165\u6216\u66f4\u65b0\u64cd\u4f5c\u65f6\u7684\u7ebf\u7a0b\u5b89\u5168\u673a\u5236\u3002\u5728C++\u4e2d\uff0c\u901a\u8fc7<atomic><\/code>\u5934\u6587\u4ef6\u4e2d\u7684\u539f\u5b50\u7c7b\u578b\u5b9e\u73b0\u3002<\/p>\n<\/p>\n

\u4e8c\u3001\u539f\u5b50\u64cd\u4f5c\u4e2d\u7684\u5185\u5b58\u987a\u5e8f\u9009\u9879<\/h3>\n<\/p>\n

\u5728C++\u7684\u539f\u5b50\u64cd\u4f5c\u4e2d\uff0c\u6709\u51e0\u79cd\u5185\u5b58\u987a\u5e8f\u9009\u9879\u53ef\u4ee5\u6307\u5b9a\uff0c\u5176\u4e2d\u5305\u62ecmemory_order_relaxed<\/code>\u3001memory_order_acquire<\/code>\u3001memory_order_release<\/code>\u3001memory_order_acq_rel<\/code>\u4ee5\u53camemory_order_seq_cst<\/code>\u3002<\/p>\n<\/p>\n

\u4e09\u3001\u5355\u4f8b\u6a21\u5f0f\u4e2d\u4f7f\u7528memory_order_acquire<\/code><\/h3>\n<\/p>\n

\u5728\u5b9e\u73b0\u5355\u4f8b\u6a21\u5f0f\u65f6\uff0c\u901a\u5e38\u4f1a\u6709\u4e00\u4e2a\u6307\u5411\u5355\u4f8b\u5bf9\u8c61\u7684\u9759\u6001\u6307\u9488\uff0c\u5e76\u5bf9\u5176\u8fdb\u884c\u68c0\u67e5\u4ee5\u786e\u5b9a\u662f\u5426\u5df2\u7ecf\u521b\u5efa\u4e86\u5355\u4f8b\u3002\u5982\u679c\u5c1a\u672a\u521b\u5efa\uff0c\u9700\u8981\u8fdb\u884c\u521d\u59cb\u5316\u3002\u8fd9\u91cc\u7684\u539f\u5b50\u64cd\u4f5c\u786e\u4fdd\u4e86\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\u7684\u7ebf\u7a0b\u5b89\u5168\u6027\u3002<\/p>\n<\/p>\n

\u4e3a\u4f55\u9009\u7528memory_order_acquire<\/code><\/h4>\n<\/p>\n

memory_order_acquire<\/code>\u5728\u539f\u5b50\u64cd\u4f5c\u4e2d\u786e\u4fdd\u5728atomic\u53d8\u91cf\u5b8c\u6210\u8bfb\u53d6\u4e4b\u524d\u7684\u5199\u5165\u64cd\u4f5c\u5bf9\u5f53\u524d\u7ebf\u7a0b\u53ef\u89c1\uff0c\u800c\u4e14\u8fd9\u79cd\u987a\u5e8f\u9632\u6b62\u4e86\u8bfb\u53d6\u53d6\u503c\u6307\u4ee4\u4e0e\u540e\u7eed\u64cd\u4f5c\u4e4b\u95f4\u7684\u91cd\u6392\uff0c\u8fd9\u5bf9\u4e8e\u5355\u4f8b\u7684\u61d2\u60f0\u521d\u59cb\u5316\u81f3\u5173\u91cd\u8981\u3002<\/p>\n<\/p>\n

\u6848\u4f8b\uff1a\u61d2\u60f0\u521d\u59cb\u5316\u7684\u5355\u4f8b\u6a21\u5f0f<\/h4>\n<\/p>\n

\u5047\u8bbe\u6709\u4e00\u4e2a\u5355\u4f8bSingleton<\/code>\uff0c\u5b83\u5177\u6709\u4e00\u4e2a\u9759\u6001\u65b9\u6cd5getInstance<\/code>\u8c03\u7528\u65f6\u5224\u65ad\u9759\u6001\u6307\u9488\u662f\u5426\u4e3anullptr<\/code>\uff0c\u8fd9\u5c31\u9700\u8981\u5728\u68c0\u67e5\u6307\u9488\u548c\u521b\u5efa\u5355\u4f8b\u5bf9\u8c61\u4e4b\u95f4\u7684\u64cd\u4f5c\u88ab\u6b63\u786e\u987a\u5e8f\u6267\u884c\uff0c\u4ece\u800c\u907f\u514d\u591a\u7ebf\u7a0b\u4e0b\u7684\u6784\u9020\u591a\u6b21\u5b9e\u4f8b\u3002<\/p>\n<\/p>\n

\u56db\u3001\u907f\u514d\u6307\u4ee4\u91cd\u6392\u4ee5\u7ef4\u62a4\u6b63\u786e\u6027<\/h3>\n<\/p>\n

\u5728\u6ca1\u6709\u660e\u786e\u6307\u660e\u5185\u5b58\u987a\u5e8f\u65f6\uff0c\u7f16\u8bd1\u5668\u548c\u5904\u7406\u5668\u53ef\u80fd\u4f1a\u91cd\u65b0\u6392\u5217\u6307\u4ee4\u4ee5\u63d0\u9ad8\u6027\u80fd\uff0c\u5bfc\u81f4\u5728\u4e00\u4e9b\u7ebf\u7a0b\u4e2d\uff0c\u5355\u4f8b\u5bf9\u8c61\u4f3c\u4e4e\u8fd8\u6ca1\u6709\u5b8c\u5168\u521d\u59cb\u5316\u3002memory_order_acquire<\/code>\u9632\u6b62\u8fd9\u79cd\u60c5\u51b5\u7684\u53d1\u751f\u3002<\/p>\n<\/p>\n

\u6307\u4ee4\u91cd\u6392\u7684\u95ee\u9898<\/h4>\n<\/p>\n

\u5982\u679c\u4e0d\u4f7f\u7528memory_order_acquire<\/code>\uff0c\u5219\u53ef\u80fd\u51fa\u73b0\u4e00\u4e2a\u7ebf\u7a0b\u521b\u5efa\u4e86\u5355\u4f8b\u5bf9\u8c61\uff0c\u4f46\u5176\u4ed6\u7ebf\u7a0b\u770b\u5230\u7684\u662f\u91cd\u65b0\u6392\u5217\u540e\u7684\u64cd\u4f5c\u987a\u5e8f\uff0c\u4ece\u800c\u770b\u5230\u4e00\u4e2a\u672a\u5b8c\u5168\u6784\u5efa\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

\u4f7f\u7528memory_order_acquire<\/code>\u7684\u4fdd\u62a4<\/h4>\n<\/p>\n

\u901a\u8fc7\u4f7f\u7528memory_order_acquire<\/code>\uff0c\u6211\u4eec\u786e\u4fdd\u5bf9\u8c61\u7684\u6784\u5efa\u5728\u4efb\u4f55\u7ebf\u7a0b\u770b\u5230\u4e4b\u524d\u90fd\u662f\u5b8c\u5168\u5b8c\u6210\u7684\uff0c\u8fd9\u662f\u7ef4\u62a4\u5355\u4f8b\u6a21\u5f0f\u786e\u5207\u884c\u4e3a\u7684\u5173\u952e\u3002<\/p>\n<\/p>\n

\u4e94\u3001\u6027\u80fd\u8003\u91cf\u4e0ememory_order_acquire<\/code><\/h3>\n<\/p>\n

\u4f7f\u7528memory_order_acquire<\/code>\u8fd8\u80fd\u5e26\u6765\u6027\u80fd\u4e0a\u7684\u76ca\u5904\uff0c\u56e0\u4e3a\u5b83\u4e0d\u9700\u8981\u50cfmemory_order_seq_cst<\/code>\u90a3\u6837\u5f3a\u7684\u987a\u5e8f\u4fdd\u8bc1\uff0c\u4ece\u800c\u5141\u8bb8\u66f4\u591a\u7684\u786c\u4ef6\u5e76\u884c\u5316\u3002<\/p>\n<\/p>\n

memory_order_acquire<\/code>\u4e0e\u6027\u80fd<\/h4>\n<\/p>\n

memory_order_acquire<\/code>\u63d0\u4f9b\u4e86\u5fc5\u8981\u7684\u540c\u6b65\u548c\u6709\u5e8f\u6027\uff0c\u540c\u65f6\u76f8\u5bf9\u4e8e\u5176\u4ed6\u66f4\u4e25\u683c\u7684\u5185\u5b58\u987a\u5e8f\uff0c\u5b83\u5141\u8bb8\u66f4\u591a\u7684\u6027\u80fd\u4f18\u5316\u7a7a\u95f4\u3002<\/p>\n<\/p>\n

\u6bd4\u8f83\u4e0d\u540c\u5185\u5b58\u987a\u5e8f\u7684\u5f00\u9500<\/h4>\n<\/p>\n

\u5176\u4ed6\u5982memory_order_seq_cst<\/code>\u7684\u5185\u5b58\u987a\u5e8f\u53ef\u80fd\u5bfc\u81f4\u66f4\u591a\u7684\u6027\u80fd\u5f00\u9500\uff0c\u56e0\u6b64\u5728\u5355\u4f8b\u6a21\u5f0f\u7684\u5b9e\u73b0\u4e2d\uff0cmemory_order_acquire<\/code>\u662f\u4e00\u4e2a\u6298\u8877\u65b9\u6848\uff0c\u5b83\u5728\u786e\u4fdd\u521d\u59cb\u5316\u5b89\u5168\u7684\u540c\u65f6\u8fd8\u5c3d\u53ef\u80fd\u5730\u4f18\u5316\u4e86\u6027\u80fd\u3002<\/p>\n<\/p>\n

\u7ed3\u8bba<\/h3>\n<\/p>\n

\u5728C++\u4e2d\u5355\u4f8b\u6a21\u5f0f\u7684\u5b9e\u73b0\u4e2d\u4f7f\u7528memory_order_acquire<\/code>\u662f\u51fa\u4e8e\u5bf9\u7ebf\u7a0b\u5b89\u5168\u3001\u6027\u80fd\u548c\u6b63\u786e\u6027\u7684\u8003\u8651\u3002\u5b83\u65e2\u4fdd\u8bc1\u4e86\u5355\u4f8b\u5bf9\u8c61\u5728\u6240\u6709\u7ebf\u7a0b\u4e2d\u6b63\u786e\u5730\u53ea\u88ab\u521d\u59cb\u5316\u4e00\u6b21\uff0c\u53c8\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u5f00\u9500\uff0c\u786e\u4fdd\u4e86\u4ee3\u7801\u5728\u591a\u6838\u5904\u7406\u5668\u4e0a\u7684\u53ef\u9760\u8fd0\u884c\u3002<\/p>\n<\/p>\n

\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

\u4e3a\u4ec0\u4e48C\u4e2d\u5355\u4f8b\u7684\u5199\u6cd5\u4e2d\u9700\u8981\u4f7f\u7528memory_order_acquire\u5462\uff1f<\/strong><\/p>\n

Memory_order_acquire\u662f\u4e00\u79cd\u5185\u5b58\u5e8f\u5217\uff0c\u5b83\u5728C\u4e2d\u5355\u4f8b\u7684\u5199\u6cd5\u4e2d\u7684\u4f5c\u7528\u662f\u4fdd\u8bc1\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u5355\u4f8b\u5bf9\u8c61\u7684\u521d\u59cb\u5316\u53ea\u4f1a\u5728\u7b2c\u4e00\u4e2a\u7ebf\u7a0b\u4e2d\u6267\u884c\u4e00\u6b21\u3002<\/p>\n

\u5982\u4f55\u4f7f\u7528memory_order_acquire\u6765\u4fdd\u8bc1\u5355\u4f8b\u7684\u5b89\u5168\u6027\uff1f<\/strong><\/p>\n

\u5728C\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528memory_order_acquire\u6765\u786e\u4fdd\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e0b\uff0c\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u591f\u6210\u529f\u521d\u59cb\u5316\u5355\u4f8b\u5bf9\u8c61\u3002\u901a\u8fc7\u5728\u5199\u5165\u64cd\u4f5c\u4e4b\u524d\u4f7f\u7528memory_order_acquire\uff0c\u53ef\u4ee5\u786e\u4fdd\u5bf9\u53d8\u91cf\u7684\u8bfb\u64cd\u4f5c\u5728\u5199\u64cd\u4f5c\u4e4b\u540e\u53d1\u751f\uff0c\u4ece\u800c\u4fdd\u8bc1\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u80fd\u591f\u6267\u884c\u521d\u59cb\u5316\u64cd\u4f5c\u3002<\/p>\n

\u9664\u4e86memory_order_acquire\uff0c\u8fd8\u6709\u5176\u4ed6\u65b9\u6cd5\u53ef\u4ee5\u5b9e\u73b0\u5355\u4f8b\u5bf9\u8c61\u7684\u5b89\u5168\u6027\u5417\uff1f<\/strong><\/p>\n

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