{"id":78979,"date":"2026-02-28T19:25:25","date_gmt":"2026-02-28T11:25:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/78979.html"},"modified":"2026-02-28T19:25:25","modified_gmt":"2026-02-28T11:25:25","slug":"%e3%80%90linux%e3%80%91%e7%ba%bf%e7%a8%8b%e5%90%8c%e6%ad%a5-%e4%bf%a1%e5%8f%b7%e9%87%8f%e5%8f%8a%e5%85%b6%e5%ae%9e%e6%88%98%e4%bb%a3%e7%a0%81","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/78979.html","title":{"rendered":"\u3010Linux\u3011\u7ebf\u7a0b\u540c\u6b65\u2014\u2014\u4fe1\u53f7\u91cf\u53ca\u5176\u5b9e\u6218\u4ee3\u7801"},"content":{"rendered":"

\u524d\u666f\u5f15\u5165<\/span><\/p>\n

\u4e92\u65a5\u9501\u4f5c\u4e3a\u4fdd\u969c\u4e34\u754c\u533a\u8d44\u6e90\u4e92\u65a5\u8bbf\u95ee\u7684\u6838\u5fc3\u673a\u5236，\u6210\u529f\u89e3\u51b3\u4e86\u591a\u7ebf\u7a0b \/ \u591a\u8fdb\u7a0b\u73af\u5883\u4e0b\u5355\u4e00\u8d44\u6e90\u7684\u7ade\u4e89\u95ee\u9898，\u786e\u4fdd\u540c\u4e00\u65f6\u95f4\u4ec5\u6709\u4e00\u4e2a\u6267\u884c\u6d41\u80fd\u591f\u64cd\u4f5c\u5171\u4eab\u8d44\u6e90\u3002\u4f46\u5728\u5b9e\u9645\u7684\u5e76\u53d1\u573a\u666f\u4e2d，\u8d44\u6e90\u7684\u7ba1\u63a7\u9700\u6c42\u5f80\u5f80\u8d85\u51fa \u201c\u72ec\u5360\u201d \u8303\u7574：\u6709\u65f6\u9700\u8981\u9650\u5236\u540c\u65f6\u8bbf\u95ee\u67d0\u7c7b\u8d44\u6e90\u7684\u6267\u884c\u6d41\u6570\u91cf（\u5982\u4ec5\u5141\u8bb8 3 \u4e2a\u7ebf\u7a0b\u540c\u65f6\u8bfb\u5199\u6587\u4ef6），\u6709\u65f6\u9700\u8981\u534f\u8c03\u591a\u4e2a\u6267\u884c\u6d41\u7684\u6267\u884c\u987a\u5e8f（\u5982\u751f\u4ea7\u8005\u751f\u4ea7\u540e\u5524\u9192\u6d88\u8d39\u8005），\u8fd9\u4e9b\u573a\u666f\u4e0b\u4e92\u65a5\u9501 \u201c\u975e 0 \u5373 1\u201d \u7684\u4e8c\u5143\u7ba1\u63a7\u6a21\u5f0f\u5df2\u65e0\u6cd5\u6ee1\u8db3\u9700\u6c42\u3002\u6b63\u662f\u4e3a\u4e86\u7a81\u7834\u4e92\u65a5\u9501\u7684\u8fd9\u79cd\u5c40\u9650\u6027，\u4fe1\u53f7\u91cf（Semaphore）\u4f5c\u4e3a\u4e00\u79cd\u66f4\u7075\u6d3b\u7684\u540c\u6b65\u539f\u8bed\u88ab\u63d0\u51fa，\u5b83\u901a\u8fc7\u4e00\u4e2a\u8ba1\u6570\u5668\u5b9e\u73b0\u4e86\u5bf9\u591a\u4efd\u5171\u4eab\u8d44\u6e90\u7684\u7cbe\u7ec6\u5316\u7ba1\u63a7，\u6210\u4e3a\u5e76\u53d1\u7f16\u7a0b\u4e2d\u89e3\u51b3\u590d\u6742\u540c\u6b65\u4e0e\u4e92\u65a5\u95ee\u9898\u7684\u5173\u952e\u5de5\u5177\u3002<\/p>\n

\u4e92\u65a5\u9501\u53ef\u4ee5\u7406\u89e3\u4e3a\u72ec\u5360\u6574\u4e2a\u7535\u5f71\u9662：\u540c\u4e00\u65f6\u95f4\u53ea\u5141\u8bb8\u4e00\u4e2a\u4eba\u5360\u7528\u5168\u573a，\u5176\u4ed6\u4eba\u90fd\u5fc5\u987b\u7b49\u5f85，\u5b83\u89e3\u51b3\u7684\u662f\u5355\u4e00\u8d44\u6e90\u7684\u72ec\u5360\u8bbf\u95ee\u95ee\u9898\u3002<\/p>\n

\u800c\u4fe1\u53f7\u91cf\u66f4\u50cf\u662f\u5bf9\u7535\u5f71\u9662\u91cc\u7684\u5ea7\u4f4d\u8fdb\u884c\u9884\u8ba2：\u5f71\u9662\u4e00\u5171\u6709 N \u4e2a\u5ea7\u4f4d，\u5c31\u5141\u8bb8\u6700\u591a N \u4e2a\u4eba\u540c\u65f6\u5165\u573a，\u6bcf\u8fdb\u6765\u4e00\u4e2a\u4eba\u5360\u7528\u4e00\u4e2a\u5ea7\u4f4d，\u6ee1\u5ea7\u540e\u5176\u4ed6\u4eba\u5fc5\u987b\u7b49\u5f85；\u6709\u4eba\u79bb\u573a\u91ca\u653e\u5ea7\u4f4d，\u4e0b\u4e00\u4e2a\u4eba\u624d\u80fd\u8fdb\u5165\u3002<\/p>\n

\"\"<\/p>\n

\u4ece\u6838\u5fc3\u903b\u8f91\u6765\u770b，\u4fe1\u53f7\u91cf\u53ef\u7b80\u5316\u7406\u89e3\u4e3a\u4e00\u4e2a\u652f\u6301\u539f\u5b50\u64cd\u4f5c\u7684\u8ba1\u6570\u5668：\u5b83\u5c06\u4e92\u65a5\u9501\u6240\u4fdd\u62a4\u7684 \u201c\u72ec\u5360\u5f0f\u6574\u4f53\u8d44\u6e90\u201d，\u62c6\u89e3\u4e3a\u8ba1\u6570\u5668\u5927\u5c0f\u5bf9\u5e94\u7684\u82e5\u5e72\u4e2a \u201c\u53ef\u5e76\u53d1\u8bbf\u95ee\u7684\u8d44\u6e90\u5c0f\u5355\u5143\u201d\u3002\u5f53\u7ebf\u7a0b\u6210\u529f\u7533\u8bf7\u4fe1\u53f7\u91cf\u8d44\u6e90\u65f6，\u8ba1\u6570\u5668\u539f\u5b50\u6027\u81ea\u51cf（\u4fdd\u8bc1\u591a\u7ebf\u7a0b\u4fee\u6539\u4e0d\u51b2\u7a81）；\u5f53\u7ebf\u7a0b\u6267\u884c\u5b8c\u4e34\u754c\u533a\u4ee3\u7801\u3001\u91ca\u653e\u4fe1\u53f7\u91cf\u8d44\u6e90\u65f6，\u8ba1\u6570\u5668\u539f\u5b50\u6027\u81ea\u589e\u3002\u6b63\u56e0\u5982\u6b64，\u82e5\u5c06\u4fe1\u53f7\u91cf\u7684\u8ba1\u6570\u5668\u521d\u59cb\u503c\u8bbe\u4e3a 1（\u5373\u4e8c\u5143\u4fe1\u53f7\u91cf），\u5176 \u201c\u540c\u4e00\u65f6\u95f4\u4ec5\u5141\u8bb8\u4e00\u4e2a\u7ebf\u7a0b\u5360\u7528\u8d44\u6e90\u201d \u7684\u7279\u6027，\u5b8c\u5168\u7b49\u4ef7\u4e8e\u4e92\u65a5\u9501\u7684\u72ec\u5360\u903b\u8f91 \u2014\u2014 \u8fd9\u4e5f\u662f\u4e92\u65a5\u9501\u672c\u8d28\u4e0a\u662f\u7279\u6b8a\u7684\u4e8c\u5143\u4fe1\u53f7\u91cf\u7684\u539f\u56e0\u3002<\/p>\n

\u63a5\u53e3\u8ba4\u8bc6<\/h2>\n

\u53d8\u91cf\u7c7b\u578b\u540d\u79f0<\/h3>\n

sem_t <\/span>\u662f POSIX \u6807\u51c6\u5b9a\u4e49\u7684\u4fe1\u53f7\u91cf\u4e13\u7528\u6570\u636e\u7c7b\u578b（\u672c\u8d28\u662f\u4e00\u4e2a\u7ed3\u6784\u4f53）\u3002<\/p>\n

\u4fe1\u53f7\u91cf\u8d44\u6e90\u521d\u59cb\u5316<\/h3>\n

\"\"<\/p>\n

sem_init()<\/span> \u662f POSIX \u6807\u51c6\u4e2d\u7528\u4e8e\u521d\u59cb\u5316\u4fe1\u53f7\u91cf\u5bf9\u8c61\u7684\u6838\u5fc3\u63a5\u53e3，\u4e5f\u662f\u4f7f\u7528\u4fe1\u53f7\u91cf\u7684\u7b2c\u4e00\u6b65 \u2014\u2014 \u672a\u901a\u8fc7\u8be5\u63a5\u53e3\u521d\u59cb\u5316\u7684 sem_t \u7c7b\u578b\u4fe1\u53f7\u91cf\u53d8\u91cf\u65e0\u6cd5\u88ab sem_wait()\/sem_post() \u7b49\u63a5\u53e3\u6b63\u5e38\u64cd\u4f5c，\u5176\u4f5c\u7528\u662f\u4e3a\u4fe1\u53f7\u91cf\u8bbe\u5b9a \u201c\u4f5c\u7528\u57df\u201d \u548c \u201c\u521d\u59cb\u8d44\u6e90\u6570\u91cf\u201d，\u5960\u5b9a\u4fe1\u53f7\u91cf\u7684\u6838\u5fc3\u884c\u4e3a\u57fa\u7840\u3002<\/p>\n\n\u53c2\u6570\u540d\u6570\u636e\u7c7b\u578b\u6838\u5fc3\u542b\u4e49\u5173\u952e\u8bf4\u660e<\/tr>\n\n\n\n\n
sem<\/td>\nsem_t *<\/td>\n\u4fe1\u53f7\u91cf\u6307\u9488<\/td>\n\u6307\u5411\u5f85\u521d\u59cb\u5316\u7684 sem_t \u7c7b\u578b\u53d8\u91cf，\u662f\u4fe1\u53f7\u91cf\u64cd\u4f5c\u7684\u6838\u5fc3\u8f7d\u4f53<\/td>\n<\/tr>\n
pshared<\/td>\nint<\/td>\n\u8fdb\u7a0b\u5171\u4eab\u6807\u8bc6<\/td>\n0：\u4fe1\u53f7\u91cf\u4ec5\u5728\u5f53\u524d\u8fdb\u7a0b\u7684\u7ebf\u7a0b\u95f4\u5171\u4eab（90% \u4ee5\u4e0a\u65e5\u5e38\u573a\u666f）；\u975e 0：\u4fe1\u53f7\u91cf\u53ef\u8de8\u591a\u4e2a\u8fdb\u7a0b\u5171\u4eab（\u9700\u914d\u5408\u5171\u4eab\u5185\u5b58）<\/td>\n<\/tr>\n
value<\/td>\nunsigned int<\/td>\n\u521d\u59cb\u8ba1\u6570\u5668\u503c<\/td>\n\u4fe1\u53f7\u91cf\u5bf9\u5e94\u7684\u521d\u59cb\u53ef\u7528\u8d44\u6e90\u6570\u91cf（\u5982\u5f71\u9662\u521d\u59cb\u5ea7\u4f4d\u6570），\u4e5f\u662f\u4fe1\u53f7\u91cf\u8ba1\u6570\u5668\u7684\u521d\u59cb\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4fe1\u53f7\u91cf\u8d44\u6e90\u7533\u8bf7<\/h3>\n

\u8be5\u63a5\u53e3\u7528\u4e8e\u7ebf\u7a0b \/ \u8fdb\u7a0b\u7533\u8bf7\u4fe1\u53f7\u91cf\u8d44\u6e90，\u53ea\u6709\u6210\u529f\u7533\u8bf7\u5230\u4fe1\u53f7\u91cf\u7684\u7ebf\u7a0b \/ \u8fdb\u7a0b，\u624d\u80fd\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u4ee3\u7801\u5757\u3002\u7c7b\u6bd4\u7535\u5f71\u9662\u573a\u666f：\u4fe1\u53f7\u91cf\u4ee3\u8868\u5f71\u9662\u5185\u7684\u6240\u6709\u5ea7\u4f4d，\u4fe1\u53f7\u91cf\u7533\u8bf7\u64cd\u4f5c\u5c31\u662f\u9884\u5b9a\u5f71\u9662\u4e2d\u7684\u4e00\u4e2a\u5ea7\u4f4d，\u9884\u5b9a\u6210\u529f\u5373\u53ef\u5165\u573a（\u6267\u884c\u540e\u7eed\u903b\u8f91），\u9884\u5b9a\u5931\u8d25\u5219\u9700\u7b49\u5f85\u4ed6\u4eba\u91ca\u653e\u5ea7\u4f4d（\u4fe1\u53f7\u91cf）\u3002<\/p>\n

\"\"<\/p>\n

1. sem_wait：\u4fe1\u53f7\u91cf\u7684 \u201c\u963b\u585e\u5f0f\u7533\u8bf7\u201d<\/h4>\n

sem_wait()<\/span> \u662f\u4fe1\u53f7\u91cf\u6700\u57fa\u7840\u7684\u8d44\u6e90\u7533\u8bf7\u63a5\u53e3，\u6838\u5fc3\u4f5c\u7528\u662f\u4ee5\u963b\u585e\u65b9\u5f0f\u62a2\u5360\u4fe1\u53f7\u91cf\u5bf9\u5e94\u7684\u5171\u4eab\u8d44\u6e90\u5355\u5143\u3002\u5176\u884c\u4e3a\u903b\u8f91\u4e3a：\u8c03\u7528\u8be5\u63a5\u53e3\u65f6，\u4f1a\u5148\u539f\u5b50\u6027\u68c0\u67e5\u4fe1\u53f7\u91cf\u8ba1\u6570\u5668\u503c \u2014\u2014 \u82e5\u8ba1\u6570\u5668\u5927\u4e8e 0（\u4ecd\u6709\u53ef\u7528\u8d44\u6e90），\u5219\u8ba1\u6570\u5668\u539f\u5b50\u6027\u51cf 1，\u63a5\u53e3\u7acb\u5373\u8fd4\u56de，\u5f53\u524d\u7ebf\u7a0b\u53ef\u7ee7\u7eed\u6267\u884c\u540e\u7eed\u4e34\u754c\u533a\u4ee3\u7801；\u82e5\u8ba1\u6570\u5668\u7b49\u4e8e 0（\u65e0\u53ef\u7528\u8d44\u6e90），\u5f53\u524d\u7ebf\u7a0b\u4f1a\u88ab\u6302\u8d77\u5e76\u52a0\u5165\u4fe1\u53f7\u91cf\u7684\u7b49\u5f85\u961f\u5217，\u8fdb\u5165\u65e0\u9650\u963b\u585e\u72b6\u6001，\u76f4\u5230\u5176\u4ed6\u7ebf\u7a0b\u8c03\u7528 sem_post() \u91ca\u653e\u8d44\u6e90（\u8ba1\u6570\u5668\u81ea\u589e），\u8be5\u7ebf\u7a0b\u88ab\u5524\u9192\u540e\u91cd\u65b0\u7ade\u4e89\u8d44\u6e90\u3002<\/p>\n

2. sem_trywait：\u4fe1\u53f7\u91cf\u7684 \u201c\u975e\u963b\u585e\u5f0f\u7533\u8bf7\u201d<\/h4>\n

sem_trywait() <\/span>\u662f\u4fe1\u53f7\u91cf\u7684\u975e\u963b\u585e\u8d44\u6e90\u7533\u8bf7\u63a5\u53e3，\u6838\u5fc3\u4f5c\u7528\u662f\u5c1d\u8bd5\u62a2\u5360\u8d44\u6e90，\u5931\u8d25\u540e\u7acb\u5373\u8fd4\u56de，\u7edd\u4e0d\u963b\u585e\u3002\u5176\u884c\u4e3a\u903b\u8f91\u4e3a：\u8c03\u7528\u8be5\u63a5\u53e3\u65f6，\u540c\u6837\u539f\u5b50\u6027\u68c0\u67e5\u4fe1\u53f7\u91cf\u8ba1\u6570\u5668 \u2014\u2014 \u82e5\u8ba1\u6570\u5668\u5927\u4e8e 0，\u8ba1\u6570\u5668\u539f\u5b50\u6027\u51cf 1，\u63a5\u53e3\u8fd4\u56de 0（\u7533\u8bf7\u6210\u529f），\u7ebf\u7a0b\u53ef\u6267\u884c\u540e\u7eed\u4ee3\u7801；\u82e5\u8ba1\u6570\u5668\u7b49\u4e8e 0，\u63a5\u53e3\u4e0d\u4f1a\u963b\u585e\u7ebf\u7a0b，\u800c\u662f\u76f4\u63a5\u8fd4\u56de\u975e 0 \u9519\u8bef\u7801（\u901a\u5e38\u4e3a EAGAIN），\u544a\u77e5 \u201c\u8d44\u6e90\u7533\u8bf7\u5931\u8d25\u201d，\u7ebf\u7a0b\u53ef\u7acb\u5373\u6267\u884c\u964d\u7ea7\u903b\u8f91（\u5982\u653e\u5f03\u7533\u8bf7\u3001\u91cd\u8bd5\u6216\u5904\u7406\u5176\u4ed6\u4efb\u52a1）\u3002<\/p>\n

3. sem_timedwait：\u4fe1\u53f7\u91cf\u7684 \u201c\u9650\u65f6\u963b\u585e\u5f0f\u7533\u8bf7\u201d<\/h4>\n

sem_timedwait()<\/span> \u662f\u4fe1\u53f7\u91cf\u7684\u9650\u65f6\u963b\u585e\u7533\u8bf7\u63a5\u53e3，\u6838\u5fc3\u4f5c\u7528\u662f\u5728\u6307\u5b9a\u65f6\u95f4\u5185\u963b\u585e\u7b49\u5f85\u8d44\u6e90，\u8d85\u65f6\u540e\u81ea\u52a8\u653e\u5f03，\u662f \u201c\u65e0\u9650\u963b\u585e\u201d \u548c \u201c\u975e\u963b\u585e\u201d \u7684\u6298\u4e2d\u65b9\u6848\u3002\u5176\u884c\u4e3a\u903b\u8f91\u4e3a：\u8c03\u7528\u8be5\u63a5\u53e3\u65f6\u9700\u4f20\u5165\u4e00\u4e2a\u7edd\u5bf9\u8d85\u65f6\u65f6\u95f4\u70b9（\u5982\u5f53\u524d\u65f6\u95f4 + 10 \u79d2），\u9996\u5148\u539f\u5b50\u6027\u68c0\u67e5\u8ba1\u6570\u5668 \u2014\u2014 \u82e5\u6709\u53ef\u7528\u8d44\u6e90\u5219\u7acb\u5373\u7533\u8bf7\u6210\u529f；\u82e5\u65e0\u53ef\u7528\u8d44\u6e90，\u7ebf\u7a0b\u8fdb\u5165\u963b\u585e\u72b6\u6001，\u4f46\u4ec5\u7b49\u5f85\u81f3\u6307\u5b9a\u8d85\u65f6\u65f6\u95f4：\u82e5\u8d85\u65f6\u524d\u6709\u5176\u4ed6\u7ebf\u7a0b\u91ca\u653e\u8d44\u6e90，\u7ebf\u7a0b\u88ab\u5524\u9192\u5e76\u7533\u8bf7\u8d44\u6e90；\u82e5\u8d85\u65f6\u65f6\u95f4\u5230\u8fbe\u4ecd\u65e0\u53ef\u7528\u8d44\u6e90，\u63a5\u53e3\u8fd4\u56de ETIMEDOUT \u9519\u8bef\u7801，\u7ebf\u7a0b\u7ed3\u675f\u7b49\u5f85\u5e76\u6267\u884c\u8d85\u65f6\u903b\u8f91\u3002<\/p>\n

\u4fe1\u53f7\u91cf\u8d44\u6e90\u91ca\u653e<\/h3>\n

\"\"<\/p>\n

sem_post() \u662f POSIX \u6807\u51c6\u4e2d\u7528\u4e8e\u91ca\u653e\u4fe1\u53f7\u91cf\u8d44\u6e90\u7684\u6838\u5fc3\u63a5\u53e3，\u4e0e\u4fe1\u53f7\u91cf\u8d44\u6e90\u7533\u8bf7\u63a5\u53e3\u5f62\u6210 \u201c\u7533\u8bf7 – \u91ca\u653e\u201d \u7684\u5b8c\u6574\u95ed\u73af \u2014\u2014 \u5176\u6838\u5fc3\u4f5c\u7528\u662f\u5c06\u4fe1\u53f7\u91cf\u8ba1\u6570\u5668\u539f\u5b50\u6027\u9012\u589e，\u5f52\u8fd8\u5df2\u5360\u7528\u7684\u8d44\u6e90\u5355\u5143，\u5e76\u5524\u9192\u7b49\u5f85\u961f\u5217\u4e2d\u56e0\u7533\u8bf7\u8d44\u6e90\u5931\u8d25\u800c\u963b\u585e\u7684\u7ebf\u7a0b\u3002<\/p>\n

\u4fe1\u53f7\u91cf\u8d44\u6e90\u9500\u6bc1<\/h3>\n

\"\"<\/p>\n

sem_destroy() \u662f POSIX \u6807\u51c6\u4e2d\u7528\u4e8e\u9500\u6bc1\u5df2\u521d\u59cb\u5316\u4fe1\u53f7\u91cf\u7684\u6838\u5fc3\u63a5\u53e3，\u4e5f\u662f\u4fe1\u53f7\u91cf\u4f7f\u7528\u751f\u547d\u5468\u671f\u7684\u6700\u540e\u4e00\u6b65 \u2014\u2014 \u5176\u6838\u5fc3\u4f5c\u7528\u662f\u91ca\u653e sem_t \u7c7b\u578b\u4fe1\u53f7\u91cf\u5360\u7528\u7684\u7cfb\u7edf\u5185\u6838\u8d44\u6e90，\u907f\u514d\u8d44\u6e90\u6cc4\u6f0f，\u5fc5\u987b\u4e0e sem_init() \u63a5\u53e3\u914d\u5bf9\u4f7f\u7528\u3002<\/p>\n

\u57fa\u7840\u4ee3\u7801\u6f14\u793a<\/h3>\n

\u57fa\u4e8e\u4ee5\u4e0a\u63a5\u53e3\u8ba4\u8bc6，\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u7684\u8fdb\u884c\u4fe1\u53f7\u91cf\u4ece\u521d\u59cb\u5316->\u4f7f\u7528->\u9500\u6bc1\u7684demo：<\/p>\n

#include <semaphore.h>
\n#include <pthread.h>
\n#include <stdio.h>
\n#include <unistd.h>
\n#include <stdlib.h><\/p>\n

sem_t sem;<\/p>\n

void *thread_func(void *arg)
\n{
\n char *thread_name = (char *)arg;<\/p>\n

printf("[%s] \u5c1d\u8bd5\u7533\u8bf7\u4fe1\u53f7\u91cf…\\\\n", thread_name);
\n sem_wait(&sem);
\n printf("[%s] \u6210\u529f\u7533\u8bf7\u5230\u4fe1\u53f7\u91cf，\u6267\u884c\u4e34\u754c\u533a\u903b\u8f91\\\\n", thread_name);
\n sleep(2);
\n sem_post(&sem);
\n printf("[%s] \u91ca\u653e\u4fe1\u53f7\u91cf，\u4e34\u754c\u533a\u6267\u884c\u5b8c\u6bd5\\\\n", thread_name);<\/p>\n

pthread_exit(NULL);
\n}<\/p>\n

int main()
\n{
\n if (sem_init(&sem, 0, 2) == -1)
\n {
\n perror("sem_init \u521d\u59cb\u5316\u5931\u8d25");
\n exit(EXIT_FAILURE);
\n }
\n printf("\u4fe1\u53f7\u91cf\u521d\u59cb\u5316\u6210\u529f，\u521d\u59cb\u8ba1\u6570\u5668\u503c=2\\\\n");<\/p>\n

pthread_t t1, t2, t3;
\n pthread_create(&t1, NULL, thread_func, (void *)"\u7ebf\u7a0b1");
\n pthread_create(&t2, NULL, thread_func, (void *)"\u7ebf\u7a0b2");
\n pthread_create(&t3, NULL, thread_func, (void *)"\u7ebf\u7a0b3");<\/p>\n

pthread_join(t1, NULL);
\n pthread_join(t2, NULL);
\n pthread_join(t3, NULL);<\/p>\n

sem_destroy(&sem);
\n printf("\u4fe1\u53f7\u91cf\u5df2\u9500\u6bc1，\u7a0b\u5e8f\u7ed3\u675f\\\\n");<\/p>\n

return 0;
\n} <\/p>\n

\u63a5\u53e3\u7b80\u5355\u5e94\u7528\u2014\u2014\u57fa\u4e8e\u751f\u4ea7\u8005-\u6d88\u8d39\u8005\u6a21\u578b\u7684\u5c01\u88c5<\/h2>\n

\u638c\u63e1\u4fe1\u53f7\u91cf\u7684\u6838\u5fc3\u6982\u5ff5\u540e，\u6211\u4eec\u53ef\u4ee5\u5c06\u5176\u4e0e\u751f\u4ea7\u8005 – \u6d88\u8d39\u8005\u6a21\u578b\u7ed3\u5408，\u5b8c\u6210\u4ee3\u7801\u6574\u5408\u4e0e\u63a5\u53e3\u5c01\u88c5，\u5b9e\u73b0\u77e5\u8bc6\u70b9\u7684\u4e32\u8054\u843d\u5730\u3002\u4e3a\u7b80\u5316\u5b9e\u73b0，\u672c\u6587\u91c7\u7528\u6570\u7ec4（vector）\u6a21\u62df\u73af\u5f62\u961f\u5217\u7684\u65b9\u5f0f\u6765\u62bd\u8c61\u751f\u4ea7 \/ \u6d88\u8d39\u7684\u6838\u5fc3\u8fc7\u7a0b：\u4fe1\u53f7\u91cf\u7528\u4e8e\u7ba1\u63a7\u961f\u5217\u4e2d\u7a7a\u95f2\u4f4d\u7f6e\u548c\u5df2\u586b\u5145\u6570\u636e\u7684\u6570\u91cf，\u4e92\u65a5\u9501\u7528\u4e8e\u4fdd\u62a4\u591a\u751f\u4ea7\u8005 \/ \u591a\u6d88\u8d39\u8005\u5bf9\u961f\u5217\u7684\u5e76\u53d1\u64cd\u4f5c，\u6700\u7ec8\u5b8c\u6574\u5b9e\u73b0\u751f\u4ea7 – \u6d88\u8d39\u7684\u540c\u6b65\u903b\u8f91\u3002<\/p>\n

\"\"<\/p>\n

\u4e92\u65a5\u9501\u5934\u6587\u4ef6\u5c01\u88c5：<\/h3>\n

\/\/ Mutex.hpp
\n#pragma once
\n#include <iostream>
\n#include <pthread.h><\/p>\n

namespace MutexModule
\n{
\n class Mutex
\n {
\n public:
\n Mutex()
\n {
\n pthread_mutex_init(&_mutex, nullptr);
\n }
\n void Lock()
\n {
\n int n = pthread_mutex_lock(&_mutex);
\n (void)n;
\n }
\n void Unlock()
\n {
\n int n = pthread_mutex_unlock(&_mutex);
\n (void)n;
\n }
\n ~Mutex()
\n {
\n pthread_mutex_destroy(&_mutex);
\n }<\/p>\n

private:
\n pthread_mutex_t _mutex;
\n };<\/p>\n

class LockGuard
\n {
\n public:
\n LockGuard(Mutex &mutex):_mutex(mutex)
\n {
\n _mutex.Lock();
\n }
\n ~LockGuard()
\n {
\n _mutex.Unlock();
\n }
\n private:
\n Mutex &_mutex;
\n };
\n} <\/p>\n

\u4fe1\u53f7\u91cf\u5934\u6587\u4ef6\u5c01\u88c5：<\/h3>\n

\/\/ Sem.hpp
\n#pragma once
\n#include <semaphore.h>
\n#define defaultvalue 1
\nnamespace Sem
\n{
\n class SemModule
\n {
\n public:
\n SemModule(int _sem_value = defaultvalue)
\n {
\n sem_init(&_sem, 0, _sem_value);
\n }
\n void Wait()
\n {
\n sem_wait(&_sem);
\n }
\n void Post()
\n {
\n sem_post(&_sem);
\n }
\n ~SemModule()
\n {
\n sem_destroy(&_sem);
\n }<\/p>\n

private:
\n sem_t _sem;
\n };
\n} <\/p>\n

\u73af\u5f62\u961f\u5217\u5934\u6587\u4ef6\u5c01\u88c5：<\/h3>\n

\/\/ RingQueue.hpp
\n#pragma once
\n#include <vector>
\n#include "Sem.hpp"
\n#include "Mutex.hpp"
\n#define defaultsize 5
\nusing namespace std;
\nusing namespace Sem;
\nusing namespace MutexModule;
\nnamespace RQModule
\n{
\n template <typename T>
\n class RQ
\n {
\n public:
\n RQ(int cap = defaultsize)
\n : _rq(cap),
\n _rqsize(cap),
\n _empty(cap),
\n _full(0),
\n _pstep(0),
\n _cstep(0)
\n {
\n }
\n void EQueue(const T &in)
\n {
\n _empty.Wait();
\n _plock.Lock();
\n _rq[_pstep++] = in;
\n _pstep %= _rqsize;
\n _full.Post();
\n _plock.Unlock();
\n }
\n const T *Pop()
\n {
\n _full.Wait();
\n _clock.Lock();
\n const T *get = &_rq[_cstep++];
\n _cstep %= _rqsize;
\n _empty.Post();
\n _clock.Unlock();
\n return get;
\n }
\n ~RQ()
\n {
\n }<\/p>\n

private:
\n vector<T> _rq;
\n int _rqsize;
\n \/\/ \u751f\u4ea7\u8005
\n SemModule _empty;
\n unsigned int _pstep;
\n \/\/ \u6d88\u8d39\u8005
\n SemModule _full;
\n unsigned int _cstep;
\n Mutex _plock;
\n Mutex _clock;
\n };
\n} <\/p>\n

\u4e3b\u7a0b\u5e8f\u51fd\u6570：<\/h3>\n

\/\/ Main.cc
\n#include "RingQueue.hpp"
\n#include <pthread.h>
\n#include <iostream>
\n#include <unistd.h>
\nusing namespace RQModule;
\nRQ<int> *rq_ = new RQ<int>(5);
\nint Data = 1;
\nconst int Datasize = 5;
\nvoid *consumer(void *args)
\n{
\n while (1)
\n {
\n const char *name = static_cast<const char *>(args);
\n const int *accept = rq_->Pop();
\n std::cout << "\u6211\u662f" << name << std::endl
\n << "\u6211\u5f97\u5230\u4e86\u6570\u636e" << *accept;
\n sleep(1);
\n }
\n}
\nvoid *producer(void *args)
\n{
\n while (1)
\n {
\n rq_->EQueue(Data++);
\n Data %= Datasize;
\n }
\n}
\nint main()
\n{
\n pthread_t ptd1, ptd2, ctd1, ctd2, ctd3;
\n pthread_create(&ptd1, nullptr, producer, (void *)"ptd-1");
\n pthread_create(&ptd2, nullptr, producer, (void *)"ptd-2");
\n pthread_create(&ctd1, nullptr, consumer, (void *)"ctd-1");
\n pthread_create(&ctd2, nullptr, consumer, (void *)"ctd-2");
\n pthread_create(&ctd3, nullptr, consumer, (void *)"ctd-3");
\n pthread_join(ptd1, nullptr);
\n pthread_join(ptd2, nullptr);
\n pthread_join(ctd1, nullptr);
\n pthread_join(ctd2, nullptr);
\n pthread_join(ctd3, nullptr);
\n delete rq_;
\n} <\/p>\n

\u8fd0\u884c\u6548\u679c<\/h3>\n

\"\"<\/p>\n

\u5f53\u7136\u8fd9\u91cc\u73af\u5f62\u961f\u5217\u4f7f\u7528\u4e86\u6a21\u7248，\u53ef\u4ee5\u5728\u961f\u5217\u653e\u5165\u5176\u4ed6\u7c7b\u578b\u53d8\u91cf（\u51fd\u6570\u6307\u9488\u3001\u5b57\u7b26\u4e32……）<\/p>\n","protected":false},"excerpt":{"rendered":"

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