![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/03\/20260302144213-69a5a1c5f23b3.gif\")
<\/h2>\n\n
<\/h2>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u591a\u7ebf\u7a0b\u7f16\u7a0b\u7684\u4e16\u754c\u91cc，\u7ebf\u7a0b\u4e92\u65a5\u89e3\u51b3\u4e86 \u201c\u591a\u4e2a\u7ebf\u7a0b\u62a2\u8d44\u6e90\u201d \u7684\u95ee\u9898，\u4fdd\u8bc1\u4e86\u4e34\u754c\u8d44\u6e90\u7684\u72ec\u5360\u8bbf\u95ee；\u4f46\u5b9e\u9645\u5f00\u53d1\u4e2d，\u6211\u4eec\u8fd8\u9700\u8981\u89e3\u51b3 \u201c\u7ebf\u7a0b\u95f4\u6709\u5e8f\u534f\u4f5c\u201d \u7684\u95ee\u9898 \u2014\u2014 \u6bd4\u5982\u751f\u4ea7\u8005\u5fc5\u987b\u5148\u751f\u4ea7，\u6d88\u8d39\u8005\u624d\u80fd\u6d88\u8d39；\u961f\u5217\u4e3a\u7a7a\u65f6\u6d88\u8d39\u8005\u4e0d\u80fd\u778e\u5fd9\u6d3b，\u961f\u5217\u4e3a\u6ee1\u65f6\u751f\u4ea7\u8005\u4e0d\u80fd\u786c\u585e\u6570\u636e\u3002\u8fd9\u79cd \u201c\u5728\u4fdd\u8bc1\u6570\u636e\u5b89\u5168\u7684\u524d\u63d0\u4e0b，\u8ba9\u7ebf\u7a0b\u6309\u9884\u5b9a\u987a\u5e8f\u6267\u884c\u201d \u7684\u673a\u5236，\u5c31\u662f\u7ebf\u7a0b\u540c\u6b65\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5982\u679c\u8bf4\u7ebf\u7a0b\u4e92\u65a5\u662f\u7ed9\u4e34\u754c\u8d44\u6e90\u88c5\u4e86 \u201c\u9632\u76d7\u95e8\u201d，\u90a3\u7ebf\u7a0b\u540c\u6b65\u5c31\u662f\u7ed9\u7ebf\u7a0b\u534f\u4f5c\u88c5\u4e86 \u201c\u4ea4\u901a\u4fe1\u53f7\u706f\u201d，\u8ba9\u7ebf\u7a0b\u5404\u53f8\u5176\u804c\u3001\u4e92\u4e0d\u803d\u8bef\u3002\u672c\u6587\u4f5c\u4e3a\u7ebf\u7a0b\u540c\u6b65\u7684\u4e0a\u7bc7，\u5c06\u4ece\u6838\u5fc3\u6982\u5ff5\u5165\u624b，\u6df1\u5165\u62c6\u89e3\u6761\u4ef6\u53d8\u91cf\u7684\u539f\u7406\u4e0e\u7528\u6cd5，\u518d\u901a\u8fc7\u7ecf\u5178\u7684\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u5b8c\u6210\u5b9e\u6218\u843d\u5730\u3002\u4e0b\u9762\u5c31\u8ba9\u6211\u4eec\u6b63\u5f0f\u5f00\u59cb\u5427！\u00a0 \u00a0 \u00a0 \u00a0<\/p>\n
\u524d\u8a00<\/p>\n
\u4e00\u3001\u7ebf\u7a0b\u540c\u6b65\u6838\u5fc3\u6982\u5ff5：\u641e\u61c2 \u201c\u534f\u4f5c\u201d \u7684\u672c\u8d28<\/p>\n
1.1 \u4ec0\u4e48\u662f\u7ebf\u7a0b\u540c\u6b65？<\/p>\n
1.2 \u7ade\u6001\u6761\u4ef6：\u540c\u6b65\u8981\u89e3\u51b3\u7684\u6838\u5fc3\u95ee\u9898<\/p>\n
1.3 \u540c\u6b65\u7684\u6838\u5fc3：\u7b49\u5f85\u4e0e\u5524\u9192<\/p>\n
\u4e8c\u3001\u6761\u4ef6\u53d8\u91cf：\u7ebf\u7a0b\u540c\u6b65\u7684 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u795e\u5668<\/p>\n
2.1 \u6761\u4ef6\u53d8\u91cf\u7684\u6838\u5fc3\u7279\u6027<\/p>\n
2.2 \u6761\u4ef6\u53d8\u91cf\u7684\u6838\u5fc3\u63a5\u53e3<\/p>\n
2.2.1 \u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cf<\/p>\n
\u65b9\u5f0f 1：\u9759\u6001\u5206\u914d（\u63a8\u8350\u7528\u4e8e\u5168\u5c40 \/ \u9759\u6001\u53d8\u91cf）<\/p>\n
\u65b9\u5f0f 2：\u52a8\u6001\u5206\u914d（\u7528\u4e8e\u5c40\u90e8 \/ \u5806\u4e0a\u53d8\u91cf）<\/p>\n
2.2.2 \u9500\u6bc1\u6761\u4ef6\u53d8\u91cf<\/p>\n
2.2.3 \u7b49\u5f85\u6761\u4ef6\u6ee1\u8db3（\u6838\u5fc3\u63a5\u53e3）<\/p>\n
2.2.4 \u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b<\/p>\n
\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b：pthread_cond_signal<\/p>\n
\u5524\u9192\u6240\u6709\u7ebf\u7a0b：pthread_cond_broadcast<\/p>\n
2.3 \u6761\u4ef6\u53d8\u91cf\u5feb\u901f\u5165\u95e8：\u7b80\u5355\u7684\u7b49\u5f85 – \u5524\u9192\u6848\u4f8b<\/p>\n
2.3.1 \u4ee3\u7801\u5b9e\u73b0<\/p>\n
2.3.2 \u7f16\u8bd1\u8fd0\u884c<\/p>\n
2.3.3 \u8fd0\u884c\u7ed3\u679c\u5206\u6790<\/p>\n
2.4 \u4e3a\u4ec0\u4e48 pthread_cond_wait \u5fc5\u987b\u914d\u5408\u4e92\u65a5\u91cf？<\/p>\n
2.4.1 \u6838\u5fc3\u539f\u56e0 1：\u907f\u514d\u5524\u9192\u4fe1\u53f7 \u201c\u4e22\u5931\u201d<\/p>\n
2.4.2 \u6838\u5fc3\u539f\u56e0 2：\u4fdd\u8bc1\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\u5b89\u5168<\/p>\n
2.5 \u6761\u4ef6\u53d8\u91cf\u7684\u4f7f\u7528\u89c4\u8303：\u7528 while \u5224\u65ad\u6761\u4ef6，\u800c\u975e if<\/p>\n
2.5.1 \u4ec0\u4e48\u662f\u4f2a\u5524\u9192？<\/p>\n
2.5.2 \u6b63\u786e\u7684\u4f7f\u7528\u6a21\u677f（\u5fc5\u8bb0）<\/p>\n
\u6a21\u677f 1：\u7b49\u5f85\u6761\u4ef6\u7684\u7ebf\u7a0b（\u5982\u6d88\u8d39\u8005）<\/p>\n
\u6a21\u677f 2：\u53d1\u9001\u4fe1\u53f7\u7684\u7ebf\u7a0b（\u5982\u751f\u4ea7\u8005）<\/p>\n
2.6 \u6761\u4ef6\u53d8\u91cf\u7684 C++ \u5c01\u88c5：RAII \u98ce\u683c\u66f4\u4f18\u96c5<\/p>\n
2.6.1 \u5c01\u88c5\u4ee3\u7801：Cond.hpp<\/p>\n
2.6.2 \u5c01\u88c5\u4ee3\u7801\u89e3\u6790<\/p>\n
2.6.3 \u5c01\u88c5\u540e\u7684\u4f7f\u7528\u793a\u4f8b<\/p>\n
\u4e09\u3001\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b：\u7ebf\u7a0b\u540c\u6b65\u7684\u7ecf\u5178\u5b9e\u6218<\/p>\n
3.1 \u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u7684 \u201c321\u201d \u539f\u5219（\u5fc5\u8bb0）<\/p>\n
3 \u79cd\u5173\u7cfb\u8be6\u89e3：<\/p>\n
3.2 \u4e3a\u4ec0\u4e48\u9700\u8981\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b？<\/p>\n
3.3 \u57fa\u4e8e\u963b\u585e\u961f\u5217\u7684\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b（\u6761\u4ef6\u53d8\u91cf\u5b9e\u73b0）<\/p>\n
3.3.1 \u5b9e\u73b0\u601d\u8def<\/p>\n
3.3.2 \u963b\u585e\u961f\u5217\u5b9e\u73b0：BlockQueue.hpp（\u6a21\u677f\u7c7b）<\/p>\n
3.3.3 \u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u6d4b\u8bd5\u4ee3\u7801：main.cpp<\/p>\n
3.3.4 \u7f16\u8bd1\u8fd0\u884c\u4e0e\u7ed3\u679c\u5206\u6790<\/p>\n
3.4 \u6a21\u578b\u6269\u5c55：\u652f\u6301\u81ea\u5b9a\u4e49\u4efb\u52a1\u7c7b\u578b<\/p>\n
3.4.1 \u81ea\u5b9a\u4e49\u4efb\u52a1\u7c7b\u578b：Task.hpp<\/p>\n
3.4.2 \u6d4b\u8bd5\u4ee3\u7801：main_task.cpp<\/p>\n
3.4.3 \u8fd0\u884c\u7ed3\u679c<\/p>\n
\u56db\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u907f\u5751\u6307\u5357<\/p>\n
4.1 \u5751 1：\u7528 if \u5224\u65ad\u6761\u4ef6，\u800c\u975e while<\/p>\n
4.2 \u5751 2：\u5fd8\u8bb0\u89e3\u9501\u6216\u89e3\u9501\u65f6\u673a\u9519\u8bef<\/p>\n
4.3 \u5751 3：\u5524\u9192\u51fd\u6570\u4f7f\u7528\u4e0d\u5f53<\/p>\n
4.4 \u5751 4：\u961f\u5217\u5bb9\u91cf\u8bbe\u8ba1\u4e0d\u5408\u7406<\/p>\n
4.5 \u5751 5：\u7ebf\u7a0b\u9000\u51fa\u673a\u5236\u7f3a\u5931<\/p>\n
\u603b\u7ed3<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u5b66\u4e60\u5177\u4f53\u5de5\u5177\u4e4b\u524d，\u6211\u4eec\u5fc5\u987b\u5148\u7406\u6e05\u51e0\u4e2a\u6838\u5fc3\u6982\u5ff5，\u8fd9\u662f\u7406\u89e3\u540e\u7eed\u6240\u6709\u5185\u5bb9\u7684\u57fa\u7840\u3002\u8fd9\u4e9b\u6982\u5ff5\u770b\u4f3c\u62bd\u8c61，\u4f46\u7ed3\u5408\u751f\u6d3b\u573a\u666f\u4e00\u770b\u5c31\u61c2\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ebf\u7a0b\u540c\u6b65：\u5728\u4fdd\u8bc1\u6570\u636e\u5b89\u5168（\u4e92\u65a5）\u7684\u524d\u63d0\u4e0b，\u8ba9\u591a\u4e2a\u7ebf\u7a0b\u6309\u7167\u9884\u5148\u5b9a\u4e49\u7684\u987a\u5e8f\u8bbf\u95ee\u4e34\u754c\u8d44\u6e90，\u4ece\u800c\u907f\u514d\u7ebf\u7a0b\u9965\u997f\u3001\u65e0\u610f\u4e49\u8f6e\u8be2\u7b49\u95ee\u9898，\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u9ad8\u6548\u534f\u4f5c\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u540c\u6b65\u7684\u6838\u5fc3\u662f \u201c\u987a\u5e8f\u201d，\u4e92\u65a5\u7684\u6838\u5fc3\u662f \u201c\u72ec\u5360\u201d；\u540c\u6b65\u662f\u5728\u4e92\u65a5\u7684\u57fa\u7840\u4e0a\u5b9e\u73b0\u7684 \u2014\u2014 \u6ca1\u6709\u4e92\u65a5\u7684\u540c\u6b65\u4f1a\u5bfc\u81f4\u6570\u636e\u7ade\u4e89，\u6ca1\u6709\u540c\u6b65\u7684\u4e92\u65a5\u53ea\u80fd\u4fdd\u8bc1\u6570\u636e\u5b89\u5168，\u5374\u65e0\u6cd5\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684\u6709\u6548\u534f\u4f5c\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u751f\u6d3b\u6848\u4f8b：\u9910\u5385\u91cc\u7684\u53a8\u5e08（\u751f\u4ea7\u8005）\u548c\u670d\u52a1\u5458（\u6d88\u8d39\u8005）\u3002\u53a8\u5e08\u505a\u597d\u83dc（\u751f\u4ea7\u6570\u636e）\u540e，\u670d\u52a1\u5458\u624d\u80fd\u7aef\u8d70（\u6d88\u8d39\u6570\u636e）；\u5982\u679c\u83dc\u8fd8\u6ca1\u505a\u597d，\u670d\u52a1\u5458\u53ea\u80fd\u7b49\u5f85，\u4e0d\u80fd\u7a7a\u7740\u624b\u4e0a\u83dc；\u5982\u679c\u51fa\u83dc\u53e3\u6ee1\u4e86，\u53a8\u5e08\u53ea\u80fd\u7b49\u5f85，\u4e0d\u80fd\u628a\u83dc\u5806\u5728\u5730\u4e0a\u3002\u8fd9\u91cc\u7684 \u201c\u51fa\u83dc\u53e3\u201d \u5c31\u662f\u4e34\u754c\u8d44\u6e90，\u201c\u5148\u505a\u83dc\u540e\u4e0a\u83dc\u201d \u7684\u89c4\u5219\u5c31\u662f\u540c\u6b65\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ade\u6001\u6761\u4ef6：\u7531\u4e8e\u7ebf\u7a0b\u6267\u884c\u7684\u65f6\u5e8f\u4e0d\u786e\u5b9a，\u5bfc\u81f4\u7a0b\u5e8f\u6267\u884c\u7ed3\u679c\u4e0d\u7b26\u5408\u9884\u671f\u7684\u95ee\u9898，\u8fd9\u662f\u7ebf\u7a0b\u540c\u6b65\u9700\u8981\u89e3\u51b3\u7684\u6838\u5fc3\u77db\u76fe\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7b80\u5355\u6765\u8bf4，\u5c31\u662f \u201c\u7ebf\u7a0b\u6267\u884c\u987a\u5e8f\u4e71\u4e86，\u7ed3\u679c\u5c31\u9519\u4e86\u201d\u3002\u6bd4\u5982：<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ade\u6001\u6761\u4ef6\u7684\u672c\u8d28\u662f \u201c\u5171\u4eab\u8d44\u6e90\u7684\u72b6\u6001\u53d8\u5316\u4e0e\u7ebf\u7a0b\u6267\u884c\u987a\u5e8f\u4e0d\u5339\u914d\u201d，\u800c\u7ebf\u7a0b\u540c\u6b65\u5c31\u662f\u901a\u8fc7 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u673a\u5236，\u8ba9\u7ebf\u7a0b\u7684\u6267\u884c\u987a\u5e8f\u9002\u914d\u5171\u4eab\u8d44\u6e90\u7684\u72b6\u6001\u53d8\u5316\u3002<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ebf\u7a0b\u540c\u6b65\u7684\u672c\u8d28\u7684\u662f\u89e3\u51b3 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u95ee\u9898：<\/p>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728 Linux \u4e0b，\u5b9e\u73b0 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u7684\u6838\u5fc3\u5de5\u5177\u662f\u6761\u4ef6\u53d8\u91cf（pthread_cond_t）<\/span>，\u5b83\u5fc5\u987b\u4e0e\u4e92\u65a5\u91cf\u914d\u5408\u4f7f\u7528，\u624d\u80fd\u5b89\u5168\u5730\u5b9e\u73b0\u7ebf\u7a0b\u540c\u6b65\u3002<\/p>\n<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u662f POSIX \u7ebf\u7a0b\u5e93\u63d0\u4f9b\u7684\u6838\u5fc3\u540c\u6b65\u5de5\u5177，\u4e13\u95e8\u7528\u4e8e\u5b9e\u73b0\u7ebf\u7a0b\u95f4\u7684 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u673a\u5236\u3002\u5b83\u7684\u6838\u5fc3\u601d\u60f3\u662f：\u7ebf\u7a0b\u5728\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6，\u91ca\u653e\u6301\u6709\u7684\u4e92\u65a5\u91cf，\u8fdb\u5165\u963b\u585e\u7b49\u5f85；\u5f53\u5176\u4ed6\u7ebf\u7a0b\u4fee\u6539\u4e86\u5171\u4eab\u8d44\u6e90，\u4f7f\u6761\u4ef6\u6ee1\u8db3\u65f6，\u5524\u9192\u7b49\u5f85\u5728\u8be5\u6761\u4ef6\u53d8\u91cf\u4e0a\u7684\u7ebf\u7a0b，\u8ba9\u5176\u91cd\u65b0\u7ade\u4e89\u4e92\u65a5\u91cf\u5e76\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u672c\u8eab\u4e0d\u5177\u5907\u4e92\u65a5\u529f\u80fd，\u5b83\u5fc5\u987b\u4e0e\u4e92\u65a5\u91cf\u914d\u5408\u4f7f\u7528，\u539f\u56e0\u6709\u4e8c：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u7684\u6838\u5fc3\u4ef7\u503c\u5728\u4e8e：\u8ba9\u7ebf\u7a0b\u5728\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6\u4e3b\u52a8\u653e\u5f03 CPU，\u800c\u4e0d\u662f\u65e0\u610f\u4e49\u5730\u8f6e\u8be2，\u4ece\u800c\u63d0\u9ad8 CPU \u5229\u7528\u7387\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u7684\u6838\u5fc3\u7c7b\u578b\u662fpthread_cond_t<\/span>，\u6240\u6709\u64cd\u4f5c\u90fd\u56f4\u7ed5\u8fd9\u4e2a\u7c7b\u578b\u5c55\u5f00，\u6838\u5fc3\u63a5\u53e3\u5305\u62ec\u521d\u59cb\u5316\u3001\u9500\u6bc1\u3001\u7b49\u5f85\u3001\u5524\u9192，\u5747\u5728<pthread.h><\/span>\u5934\u6587\u4ef6\u4e2d\u58f0\u660e\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u548c\u4e92\u65a5\u91cf\u7c7b\u4f3c，\u6761\u4ef6\u53d8\u91cf\u7684\u521d\u59cb\u5316\u6709\u9759\u6001\u5206\u914d\u548c\u52a8\u6001\u5206\u914d\u4e24\u79cd\u65b9\u5f0f，\u9002\u7528\u4e8e\u4e0d\u540c\u573a\u666f\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528\u5b8fPTHREAD_COND_INITIALIZER<\/span>\u76f4\u63a5\u521d\u59cb\u5316，\u7b80\u5355\u9ad8\u6548，\u65e0\u9700\u624b\u52a8\u9500\u6bc1：<\/p>\n \/\/ \u9759\u6001\u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cf \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f7f\u7528pthread_cond_init<\/span>\u51fd\u6570\u521d\u59cb\u5316，\u652f\u6301\u81ea\u5b9a\u4e49\u5c5e\u6027，\u4f7f\u7528\u540e\u9700\u8981\u624b\u52a8\u9500\u6bc1：<\/p>\n int pthread_cond_init(pthread_cond_t *restrict cond, const pthread_condattr_t *restrict attr);<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u4f7f\u7528\u5b8c\u6210\u540e\u9700\u8981\u9500\u6bc1，\u91ca\u653e\u7cfb\u7edf\u8d44\u6e90，\u6838\u5fc3\u51fd\u6570\u662fpthread_cond_destroy<\/span><\/span>：<\/p>\n int pthread_cond_destroy(pthread_cond_t *cond);<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8ba9\u7ebf\u7a0b\u5728\u6307\u5b9a\u7684\u6761\u4ef6\u53d8\u91cf\u4e0a\u963b\u585e\u7b49\u5f85，\u76f4\u5230\u88ab\u5524\u9192，\u6838\u5fc3\u51fd\u6570\u662fpthread_cond_wait<\/span><\/span>：<\/p>\n int pthread_cond_wait(pthread_cond_t *restrict cond, pthread_mutex_t *restrict mutex);<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7b80\u5355\u6765\u8bf4，pthread_cond_wait<\/span>\u5b8c\u6210\u4e86 \u201c\u89e3\u9501\u2192\u7b49\u5f85\u2192\u88ab\u5524\u9192\u2192\u91cd\u65b0\u52a0\u9501\u201d \u7684\u539f\u5b50\u64cd\u4f5c，\u8fd9\u662f\u4fdd\u8bc1\u540c\u6b65\u5b89\u5168\u7684\u6838\u5fc3\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0POSIX \u7ebf\u7a0b\u5e93\u63d0\u4f9b\u4e86\u4e24\u4e2a\u5524\u9192\u51fd\u6570，\u5206\u522b\u7528\u4e8e\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b\u548c\u6240\u6709\u7ebf\u7a0b，\u6ee1\u8db3\u4e0d\u540c\u7684\u540c\u6b65\u573a\u666f\u3002<\/p>\n int pthread_cond_signal(pthread_cond_t *cond);<\/p>\n int pthread_cond_broadcast(pthread_cond_t *cond);<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e3a\u4e86\u8ba9\u5927\u5bb6\u5feb\u901f\u7406\u89e3\u6761\u4ef6\u53d8\u91cf\u7684\u4f7f\u7528，\u6211\u4eec\u5199\u4e00\u4e2a\u7b80\u5355\u7684\u6848\u4f8b：\u521b\u5efa 2 \u4e2a\u7b49\u5f85\u7ebf\u7a0b，\u4e3b\u7ebf\u7a0b\u6bcf\u9694 1 \u79d2\u5524\u9192\u5b83\u4eec，\u5206\u522b\u6d4b\u8bd5signal<\/span>\u548cbroadcast<\/span>\u7684\u6548\u679c\u3002<\/p>\n #include <iostream> \/\/ \u9759\u6001\u521d\u59cb\u5316\u4e92\u65a5\u91cf\u548c\u6761\u4ef6\u53d8\u91cf \/\/ \u7ebf\u7a0b\u6267\u884c\u51fd\u6570：\u7b49\u5f85\u6761\u4ef6\u53d8\u91cf\u88ab\u5524\u9192 \/\/ 2. \u7b49\u5f85\u6761\u4ef6\u53d8\u91cf：\u81ea\u52a8\u91ca\u653e\u4e92\u65a5\u91cf，\u88ab\u5524\u9192\u540e\u91cd\u65b0\u52a0\u9501 \/\/ 3. \u88ab\u5524\u9192\u540e\u6267\u884c：\u6b64\u65f6\u5df2\u91cd\u65b0\u83b7\u5f97\u4e92\u65a5\u91cf \/\/ 4. \u89e3\u9501：\u91ca\u653e\u4e34\u754c\u8d44\u6e90 \/\/ \u6a21\u62df\u4efb\u52a1\u6267\u884c\u8017\u65f6 int main(void) { \/\/ \u4e3b\u7ebf\u7a0b：\u6bcf\u96941\u79d2\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b \/\/ \u6d4b\u8bd51：\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b（pthread_cond_signal） \/\/ \u6d4b\u8bd52：\u5524\u9192\u6240\u6709\u7ebf\u7a0b（pthread_cond_broadcast） sleep(2); \/\/ \u9500\u6bc1\u8d44\u6e90（\u5b9e\u9645\u4e0d\u4f1a\u6267\u884c\u5230，\u8fd9\u91cc\u4ec5\u4f5c\u6f14\u793a） # \u7f16\u8bd1：\u94fe\u63a5pthread\u5e93（\u591a\u7ebf\u7a0b\u7f16\u7a0b\u5fc5\u5907） \u4f7f\u7528 pthread_cond_signal \u65f6：\u6bcf\u6b21\u53ea\u6709\u4e00\u4e2a\u7ebf\u7a0b\u88ab\u5524\u9192（\u7ebf\u7a0b A \u548c\u7ebf\u7a0b B \u4ea4\u66ff\u6267\u884c），\u8f93\u51fa\u5982\u4e0b：<\/p>\n \u7ebf\u7a0bA：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85… \u4e3b\u7ebf\u7a0b：\u51c6\u5907\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b（\u7b2c1\u6b21） \u4e3b\u7ebf\u7a0b：\u51c6\u5907\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b（\u7b2c2\u6b21） \u4f7f\u7528 pthread_cond_broadcast \u65f6：\u6bcf\u6b21\u4e24\u4e2a\u7ebf\u7a0b\u90fd\u88ab\u5524\u9192，\u8f93\u51fa\u5982\u4e0b：<\/p>\n \u7ebf\u7a0bA：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85… \u4e3b\u7ebf\u7a0b：\u51c6\u5907\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b（\u7b2c1\u6b21） \u4e3b\u7ebf\u7a0b：\u51c6\u5907\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b（\u7b2c2\u6b21） \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u4e2a\u6848\u4f8b\u6e05\u6670\u5730\u5c55\u793a\u4e86\u6761\u4ef6\u53d8\u91cf\u7684 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u673a\u5236，\u6838\u5fc3\u8981\u70b9\u662f：\u7b49\u5f85\u524d\u5fc5\u987b\u52a0\u9501，\u5524\u9192\u540e\u5fc5\u987b\u89e3\u9501，\u4e14pthread_cond_wait<\/span><\/span>\u5fc5\u987b\u4e0e\u4e92\u65a5\u91cf\u914d\u5408\u4f7f\u7528\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u662f\u9762\u8bd5\u548c\u5f00\u53d1\u4e2d\u7684\u9ad8\u9891\u95ee\u9898，\u4e5f\u662f\u7406\u89e3\u6761\u4ef6\u53d8\u91cf\u7684\u5173\u952e\u3002\u5f88\u591a\u4eba\u4f1a\u7591\u60d1：\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u5148\u89e3\u9501，\u518d\u8c03\u7528pthread_cond_wait<\/span><\/span>？\u6211\u4eec\u4ece\u4e24\u4e2a\u6838\u5fc3\u89d2\u5ea6\u89e3\u7b54\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5982\u679c\u624b\u52a8\u8bbe\u8ba1 \u201c\u89e3\u9501\u2192\u7b49\u5f85\u201d \u7684\u903b\u8f91（\u9519\u8bef\u5199\u6cd5）：<\/p>\n \/\/ \u9519\u8bef\u793a\u4f8b：\u89e3\u9501\u548c\u7b49\u5f85\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u79cd\u5199\u6cd5\u5b58\u5728\u81f4\u547d\u95ee\u9898：\u89e3\u9501\u548c\u7b49\u5f85\u4e0d\u662f\u539f\u5b50\u64cd\u4f5c\u3002\u5728pthread_mutex_unlock<\/span>\u548cpthread_cond_wait<\/span>\u4e4b\u95f4，\u53ef\u80fd\u6709\u5176\u4ed6\u7ebf\u7a0b\u4fee\u6539\u4e86\u5171\u4eab\u8d44\u6e90，\u4f7f\u6761\u4ef6\u6ee1\u8db3\u5e76\u8c03\u7528\u4e86pthread_cond_signal<\/span>；\u4f46\u6b64\u65f6\u5f53\u524d\u7ebf\u7a0b\u8fd8\u672a\u8fdb\u5165\u7b49\u5f85\u72b6\u6001，\u8fd9\u4e2a\u5524\u9192\u4fe1\u53f7\u4f1a\u88ab\u6c38\u4e45\u9519\u8fc7，\u5bfc\u81f4\u7ebf\u7a0b\u6c38\u8fdc\u963b\u585e\u5728pthread_cond_wait<\/span>\u4e2d\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u800cpthread_cond_wait<\/span>\u5c06 \u201c\u89e3\u9501\u201d \u548c \u201c\u7b49\u5f85\u201d \u5c01\u88c5\u6210\u539f\u5b50\u64cd\u4f5c，\u4ece\u6839\u672c\u4e0a\u907f\u514d\u4e86\u4fe1\u53f7\u4e22\u5931\u7684\u95ee\u9898\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u7684\u7b49\u5f85\u6761\u4ef6（\u5982\u961f\u5217\u662f\u5426\u4e3a\u7a7a\u3001\u662f\u5426\u6ee1）\u662f\u57fa\u4e8e\u5171\u4eab\u8d44\u6e90\u7684，\u800c\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\u5fc5\u987b\u4fdd\u8bc1\u4e92\u65a5\u3002\u5982\u679c\u6ca1\u6709\u4e92\u65a5\u91cf，\u591a\u4e2a\u7ebf\u7a0b\u53ef\u80fd\u540c\u65f6\u68c0\u67e5\u548c\u4fee\u6539\u7b49\u5f85\u6761\u4ef6，\u5bfc\u81f4\u7ade\u6001\u6761\u4ef6\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6bd4\u5982：\u591a\u4e2a\u6d88\u8d39\u8005\u7ebf\u7a0b\u540c\u65f6\u68c0\u67e5 \u201c\u961f\u5217\u662f\u5426\u4e3a\u7a7a\u201d，\u5982\u679c\u6ca1\u6709\u4e92\u65a5\u91cf，\u53ef\u80fd\u591a\u4e2a\u7ebf\u7a0b\u90fd\u5224\u65ad\u961f\u5217\u4e3a\u7a7a\u5e76\u8fdb\u5165\u7b49\u5f85；\u5f53\u751f\u4ea7\u8005\u751f\u4ea7\u4e00\u4e2a\u6570\u636e\u540e，\u8c03\u7528signal\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b，\u5176\u4ed6\u7ebf\u7a0b\u4ecd\u4f1a\u6c38\u8fdc\u7b49\u5f85，\u8fd9\u5c31\u662f\u5178\u578b\u7684\u540c\u6b65\u5b89\u5168\u95ee\u9898\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u603b\u7ed3：\u4e92\u65a5\u91cf\u4fdd\u8bc1\u4e86\u5171\u4eab\u8d44\u6e90（\u7b49\u5f85\u6761\u4ef6）\u7684\u8bbf\u95ee\u5b89\u5168，pthread_cond_wait\u7684\u539f\u5b50\u64cd\u4f5c\u907f\u514d\u4e86\u5524\u9192\u4fe1\u53f7\u7684\u4e22\u5931，\u4e8c\u8005\u7f3a\u4e00\u4e0d\u53ef\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u4f7f\u7528\u6761\u4ef6\u53d8\u91cf\u65f6，\u5fc5\u987b\u7528while\u5faa\u73af\u5224\u65ad\u7b49\u5f85\u6761\u4ef6，\u800c\u4e0d\u662fif\u5224\u65ad，\u8fd9\u662f\u907f\u514d \u201c\u4f2a\u5524\u9192\u201d \u7684\u5173\u952e，\u4e5f\u662f\u5f00\u53d1\u4e2d\u7684\u9ad8\u9891\u5751\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4f2a\u5524\u9192：\u7ebf\u7a0b\u5728\u6ca1\u6709\u88ab\u5176\u4ed6\u7ebf\u7a0b\u8c03\u7528signal<\/span>\u6216broadcast<\/span>\u7684\u60c5\u51b5\u4e0b，\u4ecepthread_cond_wait<\/span><\/span>\u4e2d\u88ab\u5524\u9192\u3002\u8fd9\u662f\u64cd\u4f5c\u7cfb\u7edf\u7684\u5e95\u5c42\u5b9e\u73b0\u5bfc\u81f4\u7684（\u5982\u4fe1\u53f7\u4e2d\u65ad\u3001\u7ebf\u7a0b\u8c03\u5ea6\u4f18\u5316），\u662f\u6761\u4ef6\u53d8\u91cf\u7684\u56fa\u6709\u7279\u6027，\u65e0\u6cd5\u907f\u514d\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5982\u679c\u7528if<\/span>\u5224\u65ad\u6761\u4ef6，\u4f2a\u5524\u9192\u4f1a\u5bfc\u81f4\u7ebf\u7a0b\u5728\u6761\u4ef6\u4e0d\u6ee1\u8db3\u65f6\u7ee7\u7eed\u6267\u884c，\u4ece\u800c\u5f15\u53d1\u7a0b\u5e8f\u5f02\u5e38；\u800c\u7528while<\/span>\u5faa\u73af\u5224\u65ad，\u5373\u4f7f\u53d1\u751f\u4f2a\u5524\u9192，\u7ebf\u7a0b\u4f1a\u91cd\u65b0\u68c0\u67e5\u6761\u4ef6，\u82e5\u6761\u4ef6\u4e0d\u6ee1\u8db3\u5219\u518d\u6b21\u8fdb\u5165\u7b49\u5f85，\u4ece\u6839\u672c\u4e0a\u907f\u514d\u4e86\u4f2a\u5524\u9192\u7684\u5f71\u54cd\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6761\u4ef6\u53d8\u91cf\u7684\u4f7f\u7528\u6709\u4e25\u683c\u7684\u89c4\u8303，\u5206\u4e3a \u201c\u7b49\u5f85\u6761\u4ef6\u201d \u548c \u201c\u53d1\u9001\u4fe1\u53f7\u201d \u4e24\u90e8\u5206，\u8fd9\u662f\u901a\u7528\u7684\u5b89\u5168\u6a21\u677f，\u65e0\u8bba\u4ec0\u4e48\u573a\u666f\u90fd\u53ef\u4ee5\u76f4\u63a5\u5957\u7528：<\/p>\n \/\/ 1. \u52a0\u9501，\u4fdd\u8bc1\u5171\u4eab\u8d44\u6e90\u7684\u4e92\u65a5\u8bbf\u95ee \/\/ 2. while\u5faa\u73af\u5224\u65ad\u6761\u4ef6，\u907f\u514d\u4f2a\u5524\u9192 \/\/ 3. \u6761\u4ef6\u6ee1\u8db3，\u64cd\u4f5c\u4e34\u754c\u8d44\u6e90 \/\/ 4. \u89e3\u9501，\u91ca\u653e\u4e34\u754c\u8d44\u6e90 \/\/ 1. \u52a0\u9501，\u4fdd\u8bc1\u5171\u4eab\u8d44\u6e90\u7684\u4e92\u65a5\u8bbf\u95ee \/\/ 2. \u4fee\u6539\u5171\u4eab\u8d44\u6e90，\u4f7f\u7b49\u5f85\u6761\u4ef6\u6ee1\u8db3 \/\/ 3. \u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b \/\/ 4. \u89e3\u9501，\u8ba9\u88ab\u5524\u9192\u7684\u7ebf\u7a0b\u91cd\u65b0\u7ade\u4e89\u4e92\u65a5\u91cf \u6838\u5fc3\u8981\u70b9：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728 C \u8bed\u8a00\u4e2d，\u4f7f\u7528\u6761\u4ef6\u53d8\u91cf\u9700\u8981\u624b\u52a8\u8c03\u7528\u521d\u59cb\u5316\u3001\u9500\u6bc1\u3001\u7b49\u5f85\u3001\u5524\u9192\u51fd\u6570，\u5bb9\u6613\u51fa\u73b0\u9057\u6f0f；\u800c\u5728 C++ \u4e2d，\u6211\u4eec\u53ef\u4ee5\u5229\u7528RAII（\u8d44\u6e90\u83b7\u53d6\u5373\u521d\u59cb\u5316） \u601d\u60f3\u5bf9\u6761\u4ef6\u53d8\u91cf\u8fdb\u884c\u5c01\u88c5，\u7ed3\u5408\u4e4b\u524d\u5c01\u88c5\u7684\u4e92\u65a5\u91cf，\u8ba9\u4ee3\u7801\u66f4\u5b89\u5168\u3001\u66f4\u4f18\u96c5，\u540c\u65f6\u4fdd\u8bc1\u53ef\u590d\u7528\u6027\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6211\u4eec\u5c06\u5c01\u88c5\u7684\u4ee3\u7801\u5199\u5728Cond.hpp\u5934\u6587\u4ef6\u4e2d，\u4f9d\u8d56\u4e4b\u524d\u5c01\u88c5\u7684Lock.hpp（\u5305\u542bMutex\u548cLockGuard\u7c7b）\u3002<\/p>\n #pragma once \/\/ \u547d\u540d\u7a7a\u95f4，\u907f\u514d\u547d\u540d\u51b2\u7a81 class Cond { \/\/ \u6784\u9020\u51fd\u6570：\u52a8\u6001\u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cf \/\/ \u7b49\u5f85\u6761\u4ef6\u53d8\u91cf：\u63a5\u6536\u81ea\u5b9a\u4e49\u7684Mutex\u5bf9\u8c61 \/\/ \u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u7ebf\u7a0b \/\/ \u5524\u9192\u6240\u6709\u7b49\u5f85\u7684\u7ebf\u7a0b \/\/ \u6790\u6784\u51fd\u6570：\u9500\u6bc1\u6761\u4ef6\u53d8\u91cf private: \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u7ed3\u5408Lock.hpp\u548cCond.hpp，\u91cd\u5199\u4e4b\u524d\u7684\u7b49\u5f85 – \u5524\u9192\u6848\u4f8b，\u4ee3\u7801\u66f4\u7b80\u6d01\u5b89\u5168：<\/p>\n #include <iostream> using namespace LockModule; \/\/ \u81ea\u5b9a\u4e49\u7684\u4e92\u65a5\u91cf\u548c\u6761\u4ef6\u53d8\u91cf void *wait_thread(void *arg) { int main(void) { sleep(2); return 0; \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u53ef\u4ee5\u770b\u5230，\u5c01\u88c5\u540e\u7684\u4ee3\u7801\u65e0\u9700\u624b\u52a8\u52a0\u9501 \/ \u89e3\u9501\u3001\u521d\u59cb\u5316 \/ \u9500\u6bc1\u8d44\u6e90，\u6781\u5927\u5730\u964d\u4f4e\u4e86\u51fa\u9519\u6982\u7387，\u8fd9\u4e5f\u662f C++ \u5c01\u88c5\u7684\u6838\u5fc3\u4f18\u52bf\u3002<\/p>\n<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u662f\u7ebf\u7a0b\u540c\u6b65\u7684\u7ecf\u5178\u5e94\u7528\u573a\u666f，\u51e0\u4e4e\u6240\u6709\u591a\u7ebf\u7a0b\u534f\u4f5c\u6846\u67b6（\u5982\u7ebf\u7a0b\u6c60\u3001\u6d88\u606f\u961f\u5217）\u90fd\u57fa\u4e8e\u8fd9\u4e2a\u6a21\u578b\u5b9e\u73b0\u3002\u5b83\u901a\u8fc7\u4e00\u4e2a\u7f13\u51b2\u533a（\u5982\u961f\u5217） \u5c06\u751f\u4ea7\u8005\u7ebf\u7a0b\u548c\u6d88\u8d39\u8005\u7ebf\u7a0b\u89e3\u8026，\u8ba9\u4e8c\u8005\u5404\u53f8\u5176\u804c\u3001\u6709\u5e8f\u534f\u4f5c，\u662f\u89e3\u51b3\u591a\u7ebf\u7a0b\u534f\u4f5c\u95ee\u9898\u7684 \u201c\u4e07\u80fd\u6a21\u677f\u201d\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u4e3a\u4e86\u65b9\u4fbf\u8bb0\u5fc6\u548c\u7406\u89e3，\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u53ef\u4ee5\u603b\u7ed3\u4e3a \u201c321\u201d \u539f\u5219，\u8fd9\u662f\u6a21\u578b\u7684\u6838\u5fc3\u7cbe\u9ad3：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u6ca1\u6709\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u7684\u60c5\u51b5\u4e0b，\u751f\u4ea7\u8005\u548c\u6d88\u8d39\u8005\u76f4\u63a5\u4ea4\u4e92，\u4f1a\u5b58\u5728\u4ee5\u4e0b\u95ee\u9898：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u800c\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u901a\u8fc7\u7f13\u51b2\u533a\u89e3\u51b3\u4e86\u8fd9\u4e9b\u95ee\u9898：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u963b\u585e\u961f\u5217（BlockingQueue） \u662f\u5b9e\u73b0\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u7684\u6700\u4f73\u8f7d\u4f53，\u5b83\u662f\u4e00\u79cd\u7279\u6b8a\u7684\u961f\u5217，\u5177\u6709\u4ee5\u4e0b\u7279\u6027：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u963b\u585e\u961f\u5217\u7684\u963b\u585e\u7279\u6027\u6b63\u597d\u5951\u5408\u4e86\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u7684\u540c\u6b65\u9700\u6c42，\u6211\u4eec\u4f7f\u7528 \u201c\u6761\u4ef6\u53d8\u91cf + \u4e92\u65a5\u91cf\u201d \u5b9e\u73b0\u963b\u585e\u961f\u5217，\u5e76\u57fa\u4e8e\u6b64\u5b9e\u73b0\u591a\u751f\u4ea7\u8005\u591a\u6d88\u8d39\u8005\u6a21\u578b\u3002<\/p>\n #ifndef __BLOCK_QUEUE_HPP__ #include <iostream> \/\/ \u6a21\u677f\u7c7b，\u652f\u6301\u4efb\u610f\u7c7b\u578b\u7684\u5143\u7d20（\u5982int\u3001\u81ea\u5b9a\u4e49\u4efb\u52a1\u5bf9\u8c61） \/\/ \u5224\u7a7a：\u961f\u5217\u4e3a\u7a7a public: \/\/ \u6790\u6784\u51fd\u6570：\u9500\u6bc1\u540c\u6b65\u8d44\u6e90 \/\/ \u751f\u4ea7\u8005\u63a5\u53e3：\u5165\u961f，\u961f\u6ee1\u65f6\u963b\u585e \/\/ 2. while\u5faa\u73af\u5224\u6ee1，\u907f\u514d\u4f2a\u5524\u9192 \/\/ 3. \u961f\u672a\u6ee1，\u751f\u4ea7\u6570\u636e（\u5165\u961f） \/\/ 4. \u5524\u9192\u7b49\u5f85\u7684\u6d88\u8d39\u8005（\u5982\u679c\u6709） \/\/ 5. \u89e3\u9501 \/\/ \u6d88\u8d39\u8005\u63a5\u53e3：\u51fa\u961f，\u961f\u7a7a\u65f6\u963b\u585e \/\/ 2. while\u5faa\u73af\u5224\u7a7a，\u907f\u514d\u4f2a\u5524\u9192 \/\/ 3. \u961f\u975e\u7a7a，\u6d88\u8d39\u6570\u636e（\u51fa\u961f） \/\/ 4. \u5524\u9192\u7b49\u5f85\u7684\u751f\u4ea7\u8005（\u5982\u679c\u6709） \/\/ 5. \u89e3\u9501 private: #endif \/\/ __BLOCK_QUEUE_HPP__<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u6211\u4eec\u521b\u5efa 2 \u4e2a\u751f\u4ea7\u8005\u7ebf\u7a0b\u548c 3 \u4e2a\u6d88\u8d39\u8005\u7ebf\u7a0b，\u6d4b\u8bd5\u963b\u585e\u961f\u5217\u7684\u529f\u80fd，\u751f\u4ea7\u8005\u6bcf\u9694 1 \u79d2\u751f\u4ea7\u4e00\u4e2a\u6574\u6570，\u6d88\u8d39\u8005\u6bcf\u9694 2 \u79d2\u6d88\u8d39\u4e00\u4e2a\u6574\u6570：<\/p>\n #include <iostream> \/\/ \u963b\u585e\u961f\u5217：\u5bb9\u91cf\u4e3a5，\u5b58\u50a8int\u7c7b\u578b\u6570\u636e \/\/ \u751f\u4ea7\u8005\u7ebf\u7a0b\u6267\u884c\u51fd\u6570 int data = 0; \/\/ \u6a21\u62df\u751f\u4ea7\u8017\u65f6 \/\/ \u6d88\u8d39\u8005\u7ebf\u7a0b\u6267\u884c\u51fd\u6570 while (true) { \/\/ \u6a21\u62df\u6d88\u8d39\u8017\u65f6 int main(void) { \/\/ \u521b\u5efa2\u4e2a\u751f\u4ea7\u8005\u7ebf\u7a0b \/\/ \u521b\u5efa3\u4e2a\u6d88\u8d39\u8005\u7ebf\u7a0b \/\/ \u7b49\u5f85\u7ebf\u7a0b\u6267\u884c（\u5b9e\u9645\u4e0d\u4f1a\u9000\u51fa，\u8fd9\u91cc\u4ec5\u4f5c\u6f14\u793a） return 0; # \u7f16\u8bd1：\u94fe\u63a5pthread\u5e93 \u8fd0\u884c\u7ed3\u679c（\u5173\u952e\u90e8\u5206）：<\/p>\n \u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u542f\u52a8（2\u751f\u4ea7\u8005，3\u6d88\u8d39\u8005，\u961f\u5217\u5bb9\u91cf5） \u7ed3\u679c\u5206\u6790：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u963b\u585e\u961f\u5217\u7684\u6a21\u677f\u8bbe\u8ba1\u652f\u6301\u4efb\u610f\u7c7b\u578b\u7684\u6570\u636e，\u9664\u4e86\u6574\u6570，\u6211\u4eec\u8fd8\u53ef\u4ee5\u5b9a\u4e49\u81ea\u5b9a\u4e49\u4efb\u52a1\u7c7b\u578b（\u5982\u8ba1\u7b97\u4efb\u52a1\u3001IO \u4efb\u52a1），\u8ba9\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u66f4\u8d34\u8fd1\u5b9e\u9645\u5f00\u53d1\u573a\u666f\u3002<\/p>\n #pragma once \/\/ \u4efb\u52a1\u7c7b\u578b：\u652f\u6301\u4efb\u610f\u65e0\u53c2\u65e0\u8fd4\u56de\u503c\u7684\u51fd\u6570 \/\/ \u793a\u4f8b\u4efb\u52a1：\u52a0\u6cd5\u8ba1\u7b97 \/\/ \u793a\u4f8b\u4efb\u52a1：\u5b57\u7b26\u4e32\u6253\u5370 #include <iostream> \/\/ \u963b\u585e\u961f\u5217：\u5b58\u50a8Task\u7c7b\u578b \/\/ \u751f\u4ea7\u8005\u7ebf\u7a0b：\u751f\u4ea7\u4efb\u52a1 int count = 0; count++; \/\/ \u6d88\u8d39\u8005\u7ebf\u7a0b：\u6d88\u8d39\u4efb\u52a1 while (true) { \/\/ \u6267\u884c\u4efb\u52a1 sleep(2); int main(void) { \/\/ \u521b\u5efa2\u4e2a\u751f\u4ea7\u8005\u7ebf\u7a0b \/\/ \u521b\u5efa2\u4e2a\u6d88\u8d39\u8005\u7ebf\u7a0b \/\/ \u7b49\u5f85\u7ebf\u7a0b\u6267\u884c return 0; \u4efb\u52a1\u578b\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u542f\u52a8（2\u751f\u4ea7\u8005，2\u6d88\u8d39\u8005，\u961f\u5217\u5bb9\u91cf3） \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u8fd9\u4e2a\u6269\u5c55\u6848\u4f8b\u5c55\u793a\u4e86\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u7684\u7075\u6d3b\u6027，\u901a\u8fc7\u81ea\u5b9a\u4e49\u4efb\u52a1\u7c7b\u578b，\u53ef\u4ee5\u5c06\u5176\u5e94\u7528\u4e8e\u5404\u79cd\u5b9e\u9645\u573a\u666f（\u5982 Web \u670d\u52a1\u5668\u7684\u8bf7\u6c42\u5904\u7406\u3001\u540e\u53f0\u4efb\u52a1\u8c03\u5ea6\u7b49）\u3002<\/p>\n<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5728\u4f7f\u7528\u6761\u4ef6\u53d8\u91cf\u548c\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u65f6，\u5bb9\u6613\u9047\u5230\u4e00\u4e9b\u95ee\u9898，\u8fd9\u91cc\u603b\u7ed3\u4e86\u9ad8\u9891\u5751\u548c\u907f\u5751\u6280\u5de7，\u5e2e\u52a9\u4f60\u5199\u51fa\u66f4\u5065\u58ee\u7684\u4ee3\u7801\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u95ee\u9898：\u4f7f\u7528if<\/span>\u5224\u65ad\u7b49\u5f85\u6761\u4ef6，\u9047\u5230\u4f2a\u5524\u9192\u65f6，\u7ebf\u7a0b\u4f1a\u5728\u6761\u4ef6\u4e0d\u6ee1\u8db3\u7684\u60c5\u51b5\u4e0b\u7ee7\u7eed\u6267\u884c，\u5bfc\u81f4\u6570\u636e\u9519\u8bef；<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u89e3\u51b3：\u5fc5\u987b\u7528while<\/span>\u5faa\u73af\u5224\u65ad\u6761\u4ef6，\u5373\u4f7f\u88ab\u4f2a\u5524\u9192，\u4e5f\u4f1a\u91cd\u65b0\u68c0\u67e5\u6761\u4ef6，\u4e0d\u6ee1\u8db3\u5219\u7ee7\u7eed\u7b49\u5f85\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u95ee\u9898：\u52a0\u9501\u540e\u5fd8\u8bb0\u89e3\u9501，\u6216\u5728\u6761\u4ef6\u5224\u65ad\u524d\u89e3\u9501，\u5bfc\u81f4\u6b7b\u9501\u6216\u6570\u636e\u7ade\u4e89；<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u89e3\u51b3：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u95ee\u9898：\u5728\u591a\u751f\u4ea7\u8005\u591a\u6d88\u8d39\u8005\u573a\u666f\u4e2d，\u4f7f\u7528signal\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b，\u5bfc\u81f4\u90e8\u5206\u7ebf\u7a0b\u6c38\u8fdc\u7b49\u5f85；\u89e3\u51b3：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u95ee\u9898：\u961f\u5217\u5bb9\u91cf\u8fc7\u5927\u5bfc\u81f4\u5185\u5b58\u6d6a\u8d39，\u8fc7\u5c0f\u5bfc\u81f4\u751f\u4ea7\u8005\u9891\u7e41\u7b49\u5f85；<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u89e3\u51b3：\u6839\u636e\u5b9e\u9645\u573a\u666f\u8c03\u6574\u961f\u5217\u5bb9\u91cf，\u4e00\u822c\u8bbe\u7f6e\u4e3a CPU \u6838\u5fc3\u6570\u7684 2~4 \u500d，\u6216\u6839\u636e\u751f\u4ea7\u6d88\u8d39\u901f\u5ea6\u52a8\u6001\u8c03\u6574\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u95ee\u9898：\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u7ebf\u7a0b\u8fdb\u5165\u65e0\u9650\u5faa\u73af，\u65e0\u6cd5\u6b63\u5e38\u9000\u51fa；<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u89e3\u51b3：<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u672c\u6587\u4f5c\u4e3a\u7ebf\u7a0b\u540c\u6b65\u7684\u4e0a\u7bc7，\u4ece\u6838\u5fc3\u6982\u5ff5\u51fa\u53d1，\u6df1\u5165\u8bb2\u89e3\u4e86\u6761\u4ef6\u53d8\u91cf\u7684\u539f\u7406\u4e0e\u7528\u6cd5，\u518d\u901a\u8fc7\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u5b8c\u6210\u4e86\u5b9e\u6218\u843d\u5730\u3002\u5728\u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d，\u6211\u4eec\u5c06\u7ee7\u7eed\u6df1\u5165\u7ebf\u7a0b\u540c\u6b65\u3002<\/p>\n \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5982\u679c\u672c\u6587\u5bf9\u4f60\u6709\u5e2e\u52a9，\u6b22\u8fce\u70b9\u8d5e\u3001\u6536\u85cf\u3001\u5173\u6ce8！\u5982\u679c\u5728\u5b66\u4e60\u8fc7\u7a0b\u4e2d\u9047\u5230\u4e86\u95ee\u9898，\u6216\u8005\u6709\u66f4\u597d\u7684\u5b9e\u6218\u6848\u4f8b，\u6b22\u8fce\u5728\u8bc4\u8bba\u533a\u7559\u8a00\u4ea4\u6d41！<\/p>\n","protected":false},"excerpt":{"rendered":" \u524d\u8a00 \u5728\u591a\u7ebf\u7a0b\u7f16\u7a0b\u7684\u4e16\u754c\u91cc，\u7ebf\u7a0b\u4e92\u65a5\u89e3\u51b3\u4e86 \u201c\u591a\u4e2a\u7ebf\u7a0b\u62a2\u8d44\u6e90\u201d \u7684\u95ee\u9898，\u4fdd\u8bc1\u4e86\u4e34\u754c\u8d44\u6e90\u7684\u72ec\u5360\u8bbf\u95ee；\u4f46\u5b9e\u9645\u5f00\u53d1\u4e2d，\u6211\u4eec\u8fd8\u9700\u8981\u89e3\u51b3 \u201c\u7ebf\u7a0b\u95f4\u6709\u5e8f\u534f\u4f5c\u201d \u7684\u95ee\u9898 \u2014\u2014 \u6bd4\u5982\u751f\u4ea7\u8005\u5fc5\u987b\u5148\u751f\u4ea7，\u6d88\u8d39\u8005\u624d\u80fd\u6d88\u8d39；\u961f\u5217\u4e3a\u7a7a\u65f6\u6d88\u8d39\u8005\u4e0d\u80fd\u778e\u5fd9\u6d3b，\u961f\u5217\u4e3a\u6ee1\u65f6\u751f\u4ea7\u8005\u4e0d\u80fd\u786c\u585e\u6570\u636e\u3002\u8fd9\u79cd \u201c\u5728\u4fdd\u8bc1\u6570\u636e\u5b89\u5168\u7684\u524d\u63d0\u4e0b，\u8ba9\u7ebf\u7a0b\u6309\u9884\u5b9a\u987a\u5e8f\u6267\u884c\u201d \u7684\u673a\u5236，\u5c31\u662f\u7ebf\u7a0b\u540c\u6b65\u3002 \u5982\u679c\u8bf4\u7ebf\u7a0b\u4e92\u65a5\u662f<\/p>\n","protected":false},"author":2,"featured_media":79723,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[8912,1054,58,16,3278,44,1714],"topic":[],"class_list":["post-79726","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-8912","tag-c-c","tag-linux","tag-16","tag-3278","tag-44","tag-1714"],"yoast_head":"\n\u4e8c\u3001\u6761\u4ef6\u53d8\u91cf：\u7ebf\u7a0b\u540c\u6b65\u7684 \u201c\u7b49\u5f85 – \u5524\u9192\u201d \u795e\u5668<\/h2>\n
2.1 \u6761\u4ef6\u53d8\u91cf\u7684\u6838\u5fc3\u7279\u6027<\/h3>\n
2.2 \u6761\u4ef6\u53d8\u91cf\u7684\u6838\u5fc3\u63a5\u53e3<\/h3>\n
2.2.1 \u521d\u59cb\u5316\u6761\u4ef6\u53d8\u91cf<\/h4>\n
\u65b9\u5f0f 1：\u9759\u6001\u5206\u914d（\u63a8\u8350\u7528\u4e8e\u5168\u5c40 \/ \u9759\u6001\u53d8\u91cf）<\/h5>\n
\npthread_cond_t cond = PTHREAD_COND_INITIALIZER;
\n\/\/ \u914d\u5408\u9759\u6001\u521d\u59cb\u5316\u7684\u4e92\u65a5\u91cf
\npthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;<\/p>\n\u65b9\u5f0f 2：\u52a8\u6001\u5206\u914d（\u7528\u4e8e\u5c40\u90e8 \/ \u5806\u4e0a\u53d8\u91cf）<\/h5>\n
\n
\n
2.2.2 \u9500\u6bc1\u6761\u4ef6\u53d8\u91cf<\/h4>\n
\n
2.2.3 \u7b49\u5f85\u6761\u4ef6\u6ee1\u8db3（\u6838\u5fc3\u63a5\u53e3）<\/h4>\n
\n
\n
2.2.4 \u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b<\/h4>\n
\u5524\u9192\u4e00\u4e2a\u7ebf\u7a0b：pthread_cond_signal<\/h5>\n
\n
\u5524\u9192\u6240\u6709\u7ebf\u7a0b：pthread_cond_broadcast<\/h5>\n
\n
2.3 \u6761\u4ef6\u53d8\u91cf\u5feb\u901f\u5165\u95e8：\u7b80\u5355\u7684\u7b49\u5f85 – \u5524\u9192\u6848\u4f8b<\/h3>\n
2.3.1 \u4ee3\u7801\u5b9e\u73b0<\/h4>\n
\n#include <cstring>
\n#include <unistd.h>
\n#include <pthread.h><\/p>\n
\npthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
\npthread_cond_t cond = PTHREAD_COND_INITIALIZER;<\/p>\n
\nvoid *wait_thread(void *arg) {
\n char *thread_name = static_cast<char*>(arg);
\n while (true) {
\n \/\/ 1. \u52a0\u9501：\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u524d\u5fc5\u987b\u4fdd\u8bc1\u4e92\u65a5
\n pthread_mutex_lock(&mutex);<\/p>\n
\n std::cout << thread_name << "：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…" << std::endl;
\n pthread_cond_wait(&cond, &mutex);<\/p>\n
\n std::cout << thread_name << "：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…" << std::endl;<\/p>\n
\n pthread_mutex_unlock(&mutex);<\/p>\n
\n sleep(1);
\n }
\n return nullptr;
\n}<\/p>\n
\n pthread_t t1, t2;
\n \/\/ \u521b\u5efa\u4e24\u4e2a\u7b49\u5f85\u7ebf\u7a0b
\n pthread_create(&t1, NULL, wait_thread, (void*)"\u7ebf\u7a0bA");
\n pthread_create(&t2, NULL, wait_thread, (void*)"\u7ebf\u7a0bB");<\/p>\n
\n sleep(2); \/\/ \u786e\u4fdd\u4e24\u4e2a\u7ebf\u7a0b\u90fd\u5df2\u542f\u52a8\u5e76\u8fdb\u5165\u7b49\u5f85
\n int count = 0;
\n while (count < 3) {
\n std::cout << "\\\\n\u4e3b\u7ebf\u7a0b：\u51c6\u5907\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b（\u7b2c" << count+1 << "\u6b21）" << std::endl;<\/p>\n
\n \/\/ pthread_cond_signal(&cond);<\/p>\n
\n pthread_cond_broadcast(&cond);<\/p>\n
\n count++;
\n }<\/p>\n
\n pthread_cond_destroy(&cond);
\n pthread_mutex_destroy(&mutex);
\n return 0;
\n}<\/p>\n2.3.2 \u7f16\u8bd1\u8fd0\u884c<\/h4>\n
\ng++ cond_demo.cpp -o cond_demo -lpthread
\n# \u8fd0\u884c
\n.\/cond_demo<\/p>\n2.3.3 \u8fd0\u884c\u7ed3\u679c\u5206\u6790<\/h4>\n
\n
\n\u7ebf\u7a0bB：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…<\/p>\n
\n\u7ebf\u7a0bA：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…
\n\u7ebf\u7a0bB：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…<\/p>\n
\n\u7ebf\u7a0bB：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…
\n\u7ebf\u7a0bA：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…\n <\/li>\n
\n\u7ebf\u7a0bB：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…<\/p>\n
\n\u7ebf\u7a0bA：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…
\n\u7ebf\u7a0bB：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…<\/p>\n
\n\u7ebf\u7a0bA：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…
\n\u7ebf\u7a0bB：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…
\n\u7ebf\u7a0bA：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…
\n\u7ebf\u7a0bB：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…\n <\/li>\n<\/ul>\n2.4 \u4e3a\u4ec0\u4e48 pthread_cond_wait \u5fc5\u987b\u914d\u5408\u4e92\u65a5\u91cf？<\/h3>\n
2.4.1 \u6838\u5fc3\u539f\u56e0 1：\u907f\u514d\u5524\u9192\u4fe1\u53f7 \u201c\u4e22\u5931\u201d<\/h4>\n
\npthread_mutex_lock(&mutex);
\nwhile (condition == false) {
\n pthread_mutex_unlock(&mutex); \/\/ \u624b\u52a8\u89e3\u9501
\n pthread_cond_wait(&cond, NULL); \/\/ \u65e0\u4e92\u65a5\u91cf\u7684\u7b49\u5f85
\n pthread_mutex_lock(&mutex); \/\/ \u91cd\u65b0\u52a0\u9501
\n}
\npthread_mutex_unlock(&mutex);<\/p>\n2.4.2 \u6838\u5fc3\u539f\u56e0 2：\u4fdd\u8bc1\u5171\u4eab\u8d44\u6e90\u7684\u8bbf\u95ee\u5b89\u5168<\/h4>\n
2.5 \u6761\u4ef6\u53d8\u91cf\u7684\u4f7f\u7528\u89c4\u8303：\u7528 while \u5224\u65ad\u6761\u4ef6，\u800c\u975e if<\/h3>\n
2.5.1 \u4ec0\u4e48\u662f\u4f2a\u5524\u9192？<\/h4>\n
2.5.2 \u6b63\u786e\u7684\u4f7f\u7528\u6a21\u677f（\u5fc5\u8bb0）<\/h4>\n
\u6a21\u677f 1：\u7b49\u5f85\u6761\u4ef6\u7684\u7ebf\u7a0b（\u5982\u6d88\u8d39\u8005）<\/h5>\n
\npthread_mutex_lock(&mutex);<\/p>\n
\nwhile (\u6761\u4ef6\u4e0d\u6ee1\u8db3) { \/\/ \u5982：\u961f\u5217\u4e3a\u7a7a
\n pthread_cond_wait(&cond, &mutex); \/\/ \u7b49\u5f85\u5e76\u81ea\u52a8\u89e3\u9501
\n}<\/p>\n
\n\/\/ … \u4e1a\u52a1\u903b\u8f91（\u5982\u4ece\u961f\u5217\u53d6\u6570\u636e） …<\/p>\n
\npthread_mutex_unlock(&mutex);<\/p>\n\u6a21\u677f 2：\u53d1\u9001\u4fe1\u53f7\u7684\u7ebf\u7a0b（\u5982\u751f\u4ea7\u8005）<\/h5>\n
\npthread_mutex_lock(&mutex);<\/p>\n
\n\/\/ … \u4e1a\u52a1\u903b\u8f91（\u5982\u5411\u961f\u5217\u52a0\u6570\u636e） …<\/p>\n
\npthread_cond_signal(&cond); \/\/ \u6216pthread_cond_broadcast<\/p>\n
\npthread_mutex_unlock(&mutex);<\/p>\n2.6 \u6761\u4ef6\u53d8\u91cf\u7684 C++ \u5c01\u88c5：RAII \u98ce\u683c\u66f4\u4f18\u96c5<\/h3>\n
2.6.1 \u5c01\u88c5\u4ee3\u7801：Cond.hpp<\/h4>\n
\n#include <iostream>
\n#include <pthread.h>
\n#include <cassert>
\n#include "Lock.hpp" \/\/ \u5f15\u5165\u4e4b\u524d\u5c01\u88c5\u7684\u4e92\u65a5\u91cf<\/p>\n
\nnamespace CondModule {
\n using namespace LockModule; \/\/ \u590d\u7528\u4e92\u65a5\u91cf\u7684\u5c01\u88c5<\/p>\n
\n public:
\n \/\/ \u7981\u6b62\u62f7\u8d1d\u548c\u8d4b\u503c（\u6761\u4ef6\u53d8\u91cf\u4e0d\u80fd\u88ab\u62f7\u8d1d）
\n Cond(const Cond&) = delete;
\n Cond& operator=(const Cond&) = delete;<\/p>\n
\n Cond() {
\n int ret = pthread_cond_init(&_cond, nullptr);
\n assert(ret == 0); \/\/ \u8c03\u8bd5\u9636\u6bb5\u65ad\u8a00，release\u7248\u672c\u81ea\u52a8\u5931\u6548
\n (void)ret; \/\/ \u907f\u514d\u7f16\u8bd1\u8b66\u544a
\n }<\/p>\n
\n void Wait(Mutex& mutex) {
\n \/\/ \u83b7\u53d6\u539f\u751f\u7684pthread_mutex_t\u6307\u9488，\u4e0e\u5e95\u5c42\u63a5\u53e3\u517c\u5bb9
\n int ret = pthread_cond_wait(&_cond, mutex.GetMutexOriginal());
\n assert(ret == 0);
\n (void)ret;
\n }<\/p>\n
\n void Notify() {
\n int ret = pthread_cond_signal(&_cond);
\n assert(ret == 0);
\n (void)ret;
\n }<\/p>\n
\n void NotifyAll() {
\n int ret = pthread_cond_broadcast(&_cond);
\n assert(ret == 0);
\n (void)ret;
\n }<\/p>\n
\n ~Cond() {
\n int ret = pthread_cond_destroy(&_cond);
\n assert(ret == 0);
\n (void)ret;
\n }<\/p>\n
\n pthread_cond_t _cond; \/\/ \u539f\u751f\u7684\u6761\u4ef6\u53d8\u91cf\u5bf9\u8c61
\n };
\n}<\/p>\n2.6.2 \u5c01\u88c5\u4ee3\u7801\u89e3\u6790<\/h4>\n
2.6.3 \u5c01\u88c5\u540e\u7684\u4f7f\u7528\u793a\u4f8b<\/h4>\n
\n#include <unistd.h>
\n#include "Lock.hpp"
\n#include "Cond.hpp"<\/p>\n
\nusing namespace CondModule;<\/p>\n
\nMutex mutex;
\nCond cond;<\/p>\n
\n char *thread_name = static_cast<char*>(arg);
\n while (true) {
\n LockGuard lock(mutex); \/\/ RAII\u52a0\u9501，\u81ea\u52a8\u89e3\u9501
\n std::cout << thread_name << "：\u6761\u4ef6\u4e0d\u6ee1\u8db3，\u8fdb\u5165\u7b49\u5f85…" << std::endl;
\n cond.Wait(mutex); \/\/ \u7b49\u5f85\u6761\u4ef6\u53d8\u91cf
\n std::cout << thread_name << "：\u88ab\u5524\u9192，\u6267\u884c\u4efb\u52a1…" << std::endl;
\n sleep(1);
\n }
\n return nullptr;
\n}<\/p>\n
\n pthread_t t1, t2;
\n pthread_create(&t1, NULL, wait_thread, (void*)"\u7ebf\u7a0bA");
\n pthread_create(&t2, NULL, wait_thread, (void*)"\u7ebf\u7a0bB");<\/p>\n
\n int count = 0;
\n while (count < 3) {
\n std::cout << "\\\\n\u4e3b\u7ebf\u7a0b：\u51c6\u5907\u5524\u9192\u7b49\u5f85\u7684\u7ebf\u7a0b（\u7b2c" << count+1 << "\u6b21）" << std::endl;
\n cond.NotifyAll(); \/\/ \u5524\u9192\u6240\u6709\u7ebf\u7a0b
\n sleep(2);
\n count++;
\n }<\/p>\n
\n}<\/p>\n\u4e09\u3001\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b：\u7ebf\u7a0b\u540c\u6b65\u7684\u7ecf\u5178\u5b9e\u6218<\/h2>\n
3.1 \u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u7684 \u201c321\u201d \u539f\u5219（\u5fc5\u8bb0）<\/h3>\n
\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/03\/20260302144214-69a5a1c66962a.png\")
<\/p>\n3 \u79cd\u5173\u7cfb\u8be6\u89e3：<\/h4>\n
\n
3.2 \u4e3a\u4ec0\u4e48\u9700\u8981\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b？<\/h3>\n
3.3 \u57fa\u4e8e\u963b\u585e\u961f\u5217\u7684\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b（\u6761\u4ef6\u53d8\u91cf\u5b9e\u73b0）<\/h3>\n
\n
![\"\"](\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/03\/20260302144214-69a5a1c68ba28.png\")
<\/p>\n3.3.1 \u5b9e\u73b0\u601d\u8def<\/h4>\n
\n
\n
3.3.2 \u963b\u585e\u961f\u5217\u5b9e\u73b0：BlockQueue.hpp（\u6a21\u677f\u7c7b）<\/h4>\n
\n#define __BLOCK_QUEUE_HPP__<\/p>\n
\n#include <queue>
\n#include <pthread.h>
\n#include <cassert>
\n#include <unistd.h><\/p>\n
\ntemplate <typename T>
\nclass BlockQueue {
\nprivate:
\n \/\/ \u5224\u6ee1：\u961f\u5217\u5927\u5c0f\u7b49\u4e8e\u6700\u5927\u5bb9\u91cf
\n bool IsFull() const {
\n return _queue.size() == _capacity;
\n }<\/p>\n
\n bool IsEmpty() const {
\n return _queue.empty();
\n }<\/p>\n
\n \/\/ \u6784\u9020\u51fd\u6570：\u521d\u59cb\u5316\u961f\u5217\u5bb9\u91cf\u548c\u540c\u6b65\u8d44\u6e90
\n BlockQueue(int capacity)
\n : _capacity(capacity), _prod_wait_cnt(0), _cons_wait_cnt(0) {
\n \/\/ \u521d\u59cb\u5316\u4e92\u65a5\u91cf\u548c\u6761\u4ef6\u53d8\u91cf
\n int ret = pthread_mutex_init(&_mutex, nullptr);
\n assert(ret == 0);
\n ret = pthread_cond_init(&_prod_cond, nullptr);
\n assert(ret == 0);
\n ret = pthread_cond_init(&_cons_cond, nullptr);
\n assert(ret == 0);
\n (void)ret; \/\/ \u907f\u514d\u7f16\u8bd1\u8b66\u544a
\n }<\/p>\n
\n ~BlockQueue() {
\n pthread_mutex_destroy(&_mutex);
\n pthread_cond_destroy(&_prod_cond);
\n pthread_cond_destroy(&_cons_cond);
\n }<\/p>\n
\n void Enqueue(const T& data) {
\n \/\/ 1. \u52a0\u9501，\u4fdd\u8bc1\u961f\u5217\u64cd\u4f5c\u7684\u4e92\u65a5\u6027
\n pthread_mutex_lock(&_mutex);<\/p>\n
\n while (IsFull()) {
\n _prod_wait_cnt++;
\n std::cout << "\u961f\u5217\u6ee1（\u5bb9\u91cf：" << _capacity << "），\u751f\u4ea7\u8005[" << pthread_self() << "]\u8fdb\u5165\u7b49\u5f85…" << std::endl;
\n pthread_cond_wait(&_prod_cond, &_mutex); \/\/ \u7b49\u5f85\u5e76\u81ea\u52a8\u89e3\u9501
\n _prod_wait_cnt–;
\n }<\/p>\n
\n _queue.push(data);
\n std::cout << "\u751f\u4ea7\u8005[" << pthread_self() << "]\u751f\u4ea7\u6570\u636e：" << data
\n << "，\u961f\u5217\u5f53\u524d\u5927\u5c0f：" << _queue.size() << std::endl;<\/p>\n
\n if (_cons_wait_cnt > 0) {
\n std::cout << "\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u6d88\u8d39\u8005" << std::endl;
\n pthread_cond_signal(&_cons_cond);
\n }<\/p>\n
\n pthread_mutex_unlock(&_mutex);
\n }<\/p>\n
\n void Dequeue(T& data) {
\n \/\/ 1. \u52a0\u9501，\u4fdd\u8bc1\u961f\u5217\u64cd\u4f5c\u7684\u4e92\u65a5\u6027
\n pthread_mutex_lock(&_mutex);<\/p>\n
\n while (IsEmpty()) {
\n _cons_wait_cnt++;
\n std::cout << "\u961f\u5217\u4e3a\u7a7a，\u6d88\u8d39\u8005[" << pthread_self() << "]\u8fdb\u5165\u7b49\u5f85…" << std::endl;
\n pthread_cond_wait(&_cons_cond, &_mutex); \/\/ \u7b49\u5f85\u5e76\u81ea\u52a8\u89e3\u9501
\n _cons_wait_cnt–;
\n }<\/p>\n
\n data = _queue.front();
\n _queue.pop();
\n std::cout << "\u6d88\u8d39\u8005[" << pthread_self() << "]\u6d88\u8d39\u6570\u636e：" << data
\n << "，\u961f\u5217\u5f53\u524d\u5927\u5c0f：" << _queue.size() << std::endl;<\/p>\n
\n if (_prod_wait_cnt > 0) {
\n std::cout << "\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u751f\u4ea7\u8005" << std::endl;
\n pthread_cond_signal(&_prod_cond);
\n }<\/p>\n
\n pthread_mutex_unlock(&_mutex);
\n }<\/p>\n
\n std::queue<T> _queue; \/\/ \u5e95\u5c42\u7f13\u51b2\u533a：\u961f\u5217
\n int _capacity; \/\/ \u961f\u5217\u6700\u5927\u5bb9\u91cf
\n pthread_mutex_t _mutex; \/\/ \u4fdd\u62a4\u961f\u5217\u7684\u4e92\u65a5\u91cf
\n pthread_cond_t _prod_cond; \/\/ \u751f\u4ea7\u8005\u6761\u4ef6\u53d8\u91cf
\n pthread_cond_t _cons_cond; \/\/ \u6d88\u8d39\u8005\u6761\u4ef6\u53d8\u91cf
\n int _prod_wait_cnt; \/\/ \u7b49\u5f85\u7684\u751f\u4ea7\u8005\u6570\u91cf
\n int _cons_wait_cnt; \/\/ \u7b49\u5f85\u7684\u6d88\u8d39\u8005\u6570\u91cf
\n};<\/p>\n3.3.3 \u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u6d4b\u8bd5\u4ee3\u7801：main.cpp<\/h4>\n
\n#include <pthread.h>
\n#include <unistd.h>
\n#include "BlockQueue.hpp"<\/p>\n
\nBlockQueue<int> g_block_queue(5);<\/p>\n
\nvoid *producer_thread(void *arg) {
\n int producer_id = *(static_cast<int*>(arg));
\n delete static_cast<int*>(arg); \/\/ \u91ca\u653e\u52a8\u6001\u5206\u914d\u7684\u53c2\u6570<\/p>\n
\n while (true) {
\n \/\/ \u751f\u4ea7\u6570\u636e：\u7b80\u5355\u9012\u589e\u7684\u6574\u6570
\n data++;
\n g_block_queue.Enqueue(data);<\/p>\n
\n sleep(1);
\n }
\n return nullptr;
\n}<\/p>\n
\nvoid *consumer_thread(void *arg) {
\n int consumer_id = *(static_cast<int*>(arg));
\n delete static_cast<int*>(arg); \/\/ \u91ca\u653e\u52a8\u6001\u5206\u914d\u7684\u53c2\u6570<\/p>\n
\n int data = 0;
\n g_block_queue.Dequeue(data);<\/p>\n
\n sleep(2);
\n }
\n return nullptr;
\n}<\/p>\n
\n std::cout << "\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u542f\u52a8（2\u751f\u4ea7\u8005，3\u6d88\u8d39\u8005，\u961f\u5217\u5bb9\u91cf5）" << std::endl;<\/p>\n
\n pthread_t prod_tids[2];
\n for (int i = 0; i < 2; ++i) {
\n int *id = new int(i+1);
\n pthread_create(&prod_tids[i], NULL, producer_thread, static_cast<void*>(id));
\n }<\/p>\n
\n pthread_t cons_tids[3];
\n for (int i = 0; i < 3; ++i) {
\n int *id = new int(i+1);
\n pthread_create(&cons_tids[i], NULL, consumer_thread, static_cast<void*>(id));
\n }<\/p>\n
\n for (int i = 0; i < 2; ++i) {
\n pthread_join(prod_tids[i], NULL);
\n }
\n for (int i = 0; i < 3; ++i) {
\n pthread_join(cons_tids[i], NULL);
\n }<\/p>\n
\n}<\/p>\n3.3.4 \u7f16\u8bd1\u8fd0\u884c\u4e0e\u7ed3\u679c\u5206\u6790<\/h4>\n
\ng++ main.cpp -o prod_cons -lpthread
\n# \u8fd0\u884c
\n.\/prod_cons<\/p>\n
\n\u751f\u4ea7\u8005[140709348478720]\u751f\u4ea7\u6570\u636e：1，\u961f\u5217\u5f53\u524d\u5927\u5c0f：1
\n\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u6d88\u8d39\u8005
\n\u6d88\u8d39\u8005[140709331693312]\u6d88\u8d39\u6570\u636e：1，\u961f\u5217\u5f53\u524d\u5927\u5c0f：0
\n\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u751f\u4ea7\u8005
\n\u751f\u4ea7\u8005[140709340086016]\u751f\u4ea7\u6570\u636e：1，\u961f\u5217\u5f53\u524d\u5927\u5c0f：1
\n\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u6d88\u8d39\u8005
\n\u751f\u4ea7\u8005[140709348478720]\u751f\u4ea7\u6570\u636e：2，\u961f\u5217\u5f53\u524d\u5927\u5c0f：2
\n\u751f\u4ea7\u8005[140709340086016]\u751f\u4ea7\u6570\u636e：2，\u961f\u5217\u5f53\u524d\u5927\u5c0f：3
\n\u751f\u4ea7\u8005[140709348478720]\u751f\u4ea7\u6570\u636e：3，\u961f\u5217\u5f53\u524d\u5927\u5c0f：4
\n\u751f\u4ea7\u8005[140709340086016]\u751f\u4ea7\u6570\u636e：3，\u961f\u5217\u5f53\u524d\u5927\u5c0f：5
\n\u751f\u4ea7\u8005[140709348478720]\u751f\u4ea7\u6570\u636e：4，\u961f\u5217\u5f53\u524d\u5927\u5c0f：5
\n\u961f\u5217\u6ee1（\u5bb9\u91cf：5），\u751f\u4ea7\u8005[140709348478720]\u8fdb\u5165\u7b49\u5f85…
\n\u6d88\u8d39\u8005[140709323300608]\u6d88\u8d39\u6570\u636e：2，\u961f\u5217\u5f53\u524d\u5927\u5c0f：4
\n\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u751f\u4ea7\u8005
\n\u751f\u4ea7\u8005[140709348478720]\u751f\u4ea7\u6570\u636e：4，\u961f\u5217\u5f53\u524d\u5927\u5c0f：5
\n\u961f\u5217\u6ee1（\u5bb9\u91cf：5），\u751f\u4ea7\u8005[140709348478720]\u8fdb\u5165\u7b49\u5f85…<\/p>\n3.4 \u6a21\u578b\u6269\u5c55：\u652f\u6301\u81ea\u5b9a\u4e49\u4efb\u52a1\u7c7b\u578b<\/h3>\n
3.4.1 \u81ea\u5b9a\u4e49\u4efb\u52a1\u7c7b\u578b：Task.hpp<\/h4>\n
\n#include <iostream>
\n#include <functional><\/p>\n
\nusing Task = std::function<void()>;<\/p>\n
\nvoid AddTask(int a, int b) {
\n int result = a + b;
\n std::cout << "\u4efb\u52a1\u6267\u884c：" << a << " + " << b << " = " << result << std::endl;
\n}<\/p>\n
\nvoid PrintTask(const std::string& msg) {
\n std::cout << "\u4efb\u52a1\u6267\u884c：" << msg << std::endl;
\n}<\/p>\n3.4.2 \u6d4b\u8bd5\u4ee3\u7801：main_task.cpp<\/h4>\n
\n#include <pthread.h>
\n#include <unistd.h>
\n#include "BlockQueue.hpp"
\n#include "Task.hpp"<\/p>\n
\nBlockQueue<Task> g_task_queue(3);<\/p>\n
\nvoid *task_producer(void *arg) {
\n int producer_id = *(static_cast<int*>(arg));
\n delete static_cast<int*>(arg);<\/p>\n
\n while (true) {
\n \/\/ \u751f\u4ea7\u4e0d\u540c\u7684\u4efb\u52a1
\n if (count % 2 == 0) {
\n \/\/ \u52a0\u6cd5\u4efb\u52a1
\n Task task = std::bind(AddTask, count, count+1);
\n g_task_queue.Enqueue(task);
\n std::cout << "\u751f\u4ea7\u8005[" << producer_id << "]\u751f\u4ea7\u52a0\u6cd5\u4efb\u52a1：" << count << " + " << count+1 << std::endl;
\n } else {
\n \/\/ \u6253\u5370\u4efb\u52a1
\n std::string msg = "Hello, Producer " + std::to_string(producer_id) + ", Task " + std::to_string(count);
\n Task task = std::bind(PrintTask, msg);
\n g_task_queue.Enqueue(task);
\n std::cout << "\u751f\u4ea7\u8005[" << producer_id << "]\u751f\u4ea7\u6253\u5370\u4efb\u52a1：" << msg << std::endl;
\n }<\/p>\n
\n sleep(1);
\n }
\n return nullptr;
\n}<\/p>\n
\nvoid *task_consumer(void *arg) {
\n int consumer_id = *(static_cast<int*>(arg));
\n delete static_cast<int*>(arg);<\/p>\n
\n Task task;
\n g_task_queue.Dequeue(task);<\/p>\n
\n std::cout << "\u6d88\u8d39\u8005[" << consumer_id << "]\u5f00\u59cb\u6267\u884c\u4efb\u52a1" << std::endl;
\n task();<\/p>\n
\n }
\n return nullptr;
\n}<\/p>\n
\n std::cout << "\u4efb\u52a1\u578b\u751f\u4ea7\u8005\u6d88\u8d39\u8005\u6a21\u578b\u542f\u52a8（2\u751f\u4ea7\u8005，2\u6d88\u8d39\u8005，\u961f\u5217\u5bb9\u91cf3）" << std::endl;<\/p>\n
\n pthread_t prod_tids[2];
\n for (int i = 0; i < 2; ++i) {
\n int *id = new int(i+1);
\n pthread_create(&prod_tids[i], NULL, task_producer, static_cast<void*>(id));
\n }<\/p>\n
\n pthread_t cons_tids[2];
\n for (int i = 0; i < 2; ++i) {
\n int *id = new int(i+1);
\n pthread_create(&cons_tids[i], NULL, task_consumer, static_cast<void*>(id));
\n }<\/p>\n
\n for (int i = 0; i < 2; ++i) {
\n pthread_join(prod_tids[i], NULL);
\n pthread_join(cons_tids[i], NULL);
\n }<\/p>\n
\n}<\/p>\n3.4.3 \u8fd0\u884c\u7ed3\u679c<\/h4>\n
\n\u751f\u4ea7\u8005[1]\u751f\u4ea7\u52a0\u6cd5\u4efb\u52a1：0 + 1
\n\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u6d88\u8d39\u8005
\n\u6d88\u8d39\u8005[1]\u5f00\u59cb\u6267\u884c\u4efb\u52a1
\n\u4efb\u52a1\u6267\u884c：0 + 1 = 1
\n\u751f\u4ea7\u8005[2]\u751f\u4ea7\u6253\u5370\u4efb\u52a1：Hello, Producer 2, Task 0
\n\u751f\u4ea7\u8005[1]\u751f\u4ea7\u6253\u5370\u4efb\u52a1：Hello, Producer 1, Task 1
\n\u751f\u4ea7\u8005[2]\u751f\u4ea7\u52a0\u6cd5\u4efb\u52a1：1 + 2
\n\u751f\u4ea7\u8005[1]\u751f\u4ea7\u52a0\u6cd5\u4efb\u52a1：2 + 3
\n\u961f\u5217\u6ee1（\u5bb9\u91cf：3），\u751f\u4ea7\u8005[1]\u8fdb\u5165\u7b49\u5f85…
\n\u6d88\u8d39\u8005[2]\u5f00\u59cb\u6267\u884c\u4efb\u52a1
\n\u4efb\u52a1\u6267\u884c：Hello, Producer 2, Task 0
\n\u5524\u9192\u4e00\u4e2a\u7b49\u5f85\u7684\u751f\u4ea7\u8005
\n\u751f\u4ea7\u8005[1]\u751f\u4ea7\u6253\u5370\u4efb\u52a1：Hello, Producer 1, Task 3
\n\u961f\u5217\u6ee1（\u5bb9\u91cf：3），\u751f\u4ea7\u8005[1]\u8fdb\u5165\u7b49\u5f85…<\/p>\n\u56db\u3001\u5e38\u89c1\u95ee\u9898\u4e0e\u907f\u5751\u6307\u5357<\/h2>\n
4.1 \u5751 1：\u7528 if \u5224\u65ad\u6761\u4ef6，\u800c\u975e while<\/h3>\n
4.2 \u5751 2：\u5fd8\u8bb0\u89e3\u9501\u6216\u89e3\u9501\u65f6\u673a\u9519\u8bef<\/h3>\n
4.3 \u5751 3：\u5524\u9192\u51fd\u6570\u4f7f\u7528\u4e0d\u5f53<\/h3>\n
4.4 \u5751 4：\u961f\u5217\u5bb9\u91cf\u8bbe\u8ba1\u4e0d\u5408\u7406<\/h3>\n
4.5 \u5751 5：\u7ebf\u7a0b\u9000\u51fa\u673a\u5236\u7f3a\u5931<\/h3>\n
\n\u603b\u7ed3<\/h2>\n