{"id":395,"date":"2023-07-26T13:54:51","date_gmt":"2023-07-26T05:54:51","guid":{"rendered":"https:\/\/blog.taiyang.space\/?p=395"},"modified":"2023-07-26T13:54:51","modified_gmt":"2023-07-26T05:54:51","slug":"l5-%e7%94%a8%e6%88%b7%e7%ba%a7%e7%ba%bf%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/blog.taiyang.space\/?p=395","title":{"rendered":"L5-\u7528\u6237\u7ea7\u7ebf\u7a0b"},"content":{"rendered":"<p>\u7ebf\u7a0b\u6709\u7740\u5e76\u53d1\u7684\u7279\u70b9\uff0c\u540c\u65f6\u53c8\u907f\u514d\u4e86\u8fdb\u7a0b\u5207\u6362\u65f6\u9700\u8981\u5207\u6362\u8d44\u6e90\u7684\u4ee3\u4ef7\uff08\u8fd9\u91cc\u7684\u8d44\u6e90\u5e94\u8be5\u662f\u6307LDT\u8868\uff09\u3002\u672c\u7ae0\u53ea\u662f\u7b80\u5355\u7684\u6982\u8ff0\u4e00\u4e0b\u7528\u6237\u7ea7\u7ebf\u7a0b\u8bbe\u8ba1\u7684\u601d\u60f3\u3002\u7406\u89e3\u7528\u6237\u7ea7\u7ebf\u7a0b\u5bf9\u7406\u89e3\u6838\u5fc3\u7ea7\u7ebf\u7a0b\u5f88\u6709\u5e2e\u52a9\u3002<\/p>\n<h2 id=\"1\u751f\u6d3b\u6848\u4f8b\">1\u3001\u751f\u6d3b\u6848\u4f8b<\/h2>\n<p>\u5982\u679c\u7f51\u7edc\u4e0d\u662f\u5f88\u597d\uff0c\u5728\u6d4f\u89c8\u7f51\u9875\u65f6\uff0c\u7f51\u9875\u901a\u5e38\u662f\u5148\u51fa\u73b0\u4e00\u4e9b\u6587\u5b57\uff0c\u7136\u540e\u6162\u6162\u663e\u793a\u4e00\u4e9b\u56fe\u7247\uff0c\u6700\u540e\u5361\u4e00\u4f1a\u518d\u663e\u793a\u4e00\u4e9b\u52a8\u753b\u3001\u89c6\u9891\u7b49\u3002\u5bf9\u4e8e\u6d4f\u89c8\u5668\u663e\u793a\u7f51\u9875\uff0c\u6211\u4eec\u53ef\u4ee5\u7b80\u5355\u7684\u770b\u6210\u4e24\u4e2a\u7ec4\u6210\u90e8\u5206\uff1a\u83b7\u53d6\u670d\u52a1\u5668\u7aef\u7684\u7f51\u9875\u5185\u5bb9 \u548c \u663e\u793a\u83b7\u53d6\u5230\u7684\u5185\u5bb9\u3002\u4ece\u4e0a\u9762\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u51fa\uff0c\u83b7\u53d6\u670d\u52a1\u5668\u7aef\u7684\u7f51\u9875\u5185\u5bb9 \u548c \u663e\u793a\u83b7\u53d6\u5230\u7684\u5185\u5bb9\uff0c\u4e24\u4e2a\u662f\u540c\u65f6\u8fdb\u884c\u7684\u3002\u8fd0\u884c\u4e2d\u7684\u6d4f\u89c8\u5668\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u8fdb\u7a0b\uff0c\u540c\u65f6\u8be5\u8fdb\u7a0b\u53c8\u521b\u5efa\u4e86\u4e24\u4e2a\u7ebf\u7a0b\uff0c\u6765\u540c\u65f6\u63a8\u8fdb \u83b7\u53d6\u670d\u52a1\u5668\u7aef\u7684\u7f51\u9875\u5185\u5bb9 \u548c \u663e\u793a\u83b7\u53d6\u5230\u7684\u5185\u5bb9 \u4e24\u4e2a\u4efb\u52a1\u3002<\/p>\n<h2 id=\"2\u7528\u6237\u7ea7\u7ebf\u7a0b\">2\u3001\u7528\u6237\u7ea7\u7ebf\u7a0b<\/h2>\n<p>\u4e3a\u4e86\u652f\u6301\u7528\u6237\u7ea7\u7ebf\u7a0b\uff0c\u9700\u8981\u8bbe\u8ba1\u4e24\u4e2a\u51fd\u6570\uff1a<code>ThreadCreate()<\/code>\u3001<code>Yield ()<\/code>\u3002ThreadCreate()\u7528\u4e8e<strong>\u521b\u5efa\u7ebf\u7a0b<\/strong>\uff0cYield ()\u7528\u4e8e<strong>\u5207\u6362\u5230\u4e0b\u4e00\u4e2a\u7ebf\u7a0b<\/strong>\u3002\u51fd\u6570\u5728\u8c03\u7528 Yield \u65f6\uff0c\u53ea\u662f\u8868\u660e\u81ea\u5df1\u4e3b\u52a8\u653e\u5f03CPU\uff0c\u4f46\u5e76\u4e0d\u77e5\u9053\u81ea\u5df1\u8981\u5207\u5230\u54ea\u4e2a\u7ebf\u7a0b\u53bb\u3002\u672c\u8282\u4e3b\u8981\u5206\u6790\u5982\u4f55\u8bbe\u8ba1\u8fd9\u4e24\u4e2a\u51fd\u6570\u3002<strong>\u7531\u4e8e\u662f\u7528\u6237\u7ea7\u7ebf\u7a0b\uff0c\u56e0\u6b64 Yield () \u53ea\u80fd\u7531\u7528\u6237\u4e3b\u52a8\u8c03\u7528\uff0c\u800c\u4e0d\u662f\u653e\u5230\u5185\u6838\u4e2d\u53bb\u6267\u884c\uff0c\u8fd9\u4e00\u70b9\u4e0e schedule() \u6709\u5f88\u5927\u533a\u522b<\/strong>\u3002\u7531\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u611f\u77e5\u4e0d\u5230\u7528\u6237\u7ea7\u7ebf\u7a0b\u7684\u5b58\u5728\uff0c\u56e0\u6b64\u5728\u5206\u914dCPU\u8d44\u6e90\u4e0a\u9762\uff0c\u7528\u6237\u7ea7\u7ebf\u7a0b\u5e76\u4e0d\u5360\u4f18\u52bf\u3002<\/p>\n<h3 id=\"21-\u4e24\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5982\u4f55\u5207\u6362\">2.1 \u4e24\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5982\u4f55\u5207\u6362<\/h3>\n<p>\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u6709 T1\u3001T2 \u4e24\u4e2a\u7ebf\u7a0b\uff0c\u5176\u4e2d T1 \u6267\u884c\u4e86A()\uff0cT2 \u6267\u884c C()\uff0c\u7eff\u8272\u5b57\u4f53\u4e3a\u5185\u5b58\u5730\u5740\uff0c\u6570\u5b57\u4e3a CPU \u6267\u884c\u6307\u4ee4\u987a\u5e8f\u3002\u3000 \u524d\u63d0\uff1a \u5047\u8bbe\u7ebf\u7a0b T1 \u4e2d\u8c03\u7528\u4e86 Yield \u51fd\u6570\uff08\u5728B\u51fd\u6570\u4e2d\uff09\uff0c\u8be5\u51fd\u6570\u4f1a\u8ba9 CPU \u5207\u6362\u5230 T2 \u7ebf\u7a0b\u53bb\u6267\u884c\uff0c\u540c\u6837 T2 \u4e2d\u4e5f\u8c03\u7528\u4e86 Yield \u51fd\u6570\uff08\u5728D\u51fd\u6570\u4e2d\uff09\uff0c\u8be5\u51fd\u6570\u4f1a\u8ba9 CPU \u5207\u6362\u5230 T1 \u7ebf\u7a0b\u53bb\u6267\u884c\u3002<\/p>\n<p>\u672c\u8282\u4e3b\u8981\u63a2\u8ba8\u5982\u4f55\u8bbe\u8ba1 ThreadCreate \u548c Yield \u51fd\u6570\u624d\u80fd\u8ba9 CPU \u6309\u7167\u56fe\u4e2d(1)\u3001(2)\u3001(3)\u7684\u987a\u5e8f\u6267\u884c\uff0c\u5728\u5207\u6362\u65f6\u4e0d\u6df7\u4e71\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202307261248542.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<h4 id=\"211-\u4e24\u4e2a\u7ebf\u7a0b\u5171\u7528\u4e00\u4e2a\u6808\">2.1.1 \u4e24\u4e2a\u7ebf\u7a0b\u5171\u7528\u4e00\u4e2a\u6808<\/h4>\n<p>\u6bcf\u4e2a\u7a0b\u5e8f\u8fd0\u884c\u65f6\u5728\u5185\u5b58\u4e2d\u90fd\u7ef4\u62a4\u4e00\u4e2a\u6808\uff0c\u8fd9\u4e2a\u6808\u8ba9\u7a0b\u5e8f\u5728\u8fdb\u884c\u5404\u79cd\u51fd\u6570\u8c03\u7528\u3001\u8df3\u8f6c\u65f6\u4e0d\u53d1\u751f\u6df7\u4e71\u3002\u201d\u4e24\u4e2a\u7ebf\u7a0b\u5171\u7528\u4e00\u4e2a\u6808\u201c\u4e5f\u5c31\u662f\u8bf4\u4e24\u4e2a\u7ebf\u7a0b\u5171\u7528\u7a0b\u5e8f\u8fd0\u884c\u65f6\u7ef4\u62a4\u7684\u90a3\u4e2a\u6808\u3002\u5047\u8bbe\u5c06 Yield () \u51fd\u6570\u8bbe\u8ba1\u4e3a\u5982\u4e0b\u5f62\u5f0f\uff1a<\/p>\n<pre><code class=\"language-c\" lang=\"c\">void Yield (){       \n\t\u627e\u5230\u4e0b\u4e00\u4e2a\u8981\u6267\u884c\u7ebf\u7a0b Tn;\n\t\u627e\u5230\u8981\u8df3\u8f6c\u5230\u7684\u5730\u5740 addr;\n\tjmp addr;\n}\n<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202307261248553.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5f53 CPU \u8df3\u8f6c\u56de 204 \u5904\u540e\uff0c\u63a5\u7740\u5c31\u4f1a\u6267\u884cB\u51fd\u6570\u7684 \u201c}\u201d\uff08\u8fd9\u91cc\u6ca1\u6709\u95ee\u9898\uff0c\u53ef\u80fd\u6709\u4eba\u4f1a\u8ba4\u4e3a\u5e94\u8be5\u662f\u53bb\u6267\u884cB\u4e2dYield \u51fd\u6570\u7684&#8221;}\u201c\uff0c\u4f46\u5176\u5b9e\u4e0d\u662f\uff0cD\u4e2d\u7684Yield\u662f\u76f4\u63a5\u8c03\u7528 jmp \u6307\u4ee4 \u8df3\u5230\u4e86204\u5904\uff0cB\u4e2dYield \u51fd\u6570\u7684\u201d}&#8221;\u4e0d\u4f1a\u88ab\u6267\u884c\uff09\uff0c\u8fd9\u65f6\u4f1a\u51fa\u6808\uff0c\u5e76\u5c06\u6808\u9876\u6570\u636e 404 \u8d4b\u7ed9 PC \u6307\u9488\u3002\u8fd9\u65f6\u5019\u95ee\u9898\u5c31\u6765\u4e86\uff0c\u672c\u6765\u6267\u884c\u5b8c B() \u5e94\u8be5\u8981\u8df3\u56de\u5230 A() \u53bb\u6267\u884c\u7684\uff0c\u7ed3\u679c\u8df3\u5230\u4e86 D()\uff0c\u53ef\u4ee5\u770b\u51fa\u4e24\u4e2a\u7ebf\u7a0b\u5171\u7528\u4e00\u4e2a\u6808\u662f\u4e0d\u5408\u683c\u7684\u3002<\/p>\n<h4 id=\"222-\u4e24\u4e2a\u7ebf\u7a0b\u4e24\u4e2a\u6808\">2.2.2 \u4e24\u4e2a\u7ebf\u7a0b\u4e24\u4e2a\u6808<\/h4>\n<p>\u201c\u4e24\u7ebf\u7a0b\u4e24\u4e2a\u6808\u201d\uff0c\u8868\u660e\u8fd9\u4e24\u4e2a\u7ebf\u7a0b\u4e0d\u518d\u4f7f\u7528\u7a0b\u5e8f\u8fd0\u884c\u65f6\u7ef4\u62a4\u7684\u90a3\u4e2a\u6808\u4e86\uff0c\u800c\u662f\u81ea\u5df1\u5f00\u8f9f\u4e00\u4e2a\u65b0\u7684\u6808\uff0c\u5f00\u8f9f\u65b0\u6808\u7684\u5de5\u4f5c\u662f\u7531 ThreadCreate() \u5b8c\u6210\u3002\u4ece1.2.1\u4e2d\u53ef\u4ee5\u770b\u51fa Yield () \u9700\u8981\u627e\u5230\u4e0b\u4e00\u4e2a\u8981\u6267\u884c\u7ebf\u7a0b\uff0c\u5e76\u4e14\u8fd8\u8981\u627e\u5230\u8981\u8df3\u8f6c\u7684\u4f4d\u7f6e\uff0c\u8fd9\u4e2a\u5176\u5b9e\u548c\u8fdb\u7a0b\u5207\u6362\u7684\u5957\u8def\u5dee\u4e0d\u591a\uff1a\u961f\u5217 + PCB\uff0c\u7ebf\u7a0b\u4e5f\u53ef\u4ee5\u5efa\u7acb\u4e00\u4e2aTCB\uff1a<\/p>\n<pre><code class=\"language-c\" lang=\"c\">struct TCB{\n\tesp;   \/\/\u7ebf\u7a0b\u6808\u9876\u5730\u5740\n    ...;\n};\n<\/code><\/pre>\n<p>Yield () \u51fd\u6570\u8bbe\u8ba1\u4e3a\u5982\u4e0b\u5f62\u5f0f\uff0c\u53ef\u4ee5\u770b\u51fa\uff0c\u6b64\u65f6Yield\u5df2\u7ecf\u4e0d\u7528\u50cf1.2.1\u4e2d\u7684\u90a3\u6837\uff0c\u53bb\u627e\u8981\u8df3\u8f6c\u5230\u7684\u5730\u5740 addr\uff0c\u56e0\u4e3a\u6b64\u65f6\u8981\u8df3\u8f6c\u7684\u5730\u5740\u5c31\u4fdd\u5b58\u5728\u5404\u4e2a\u7ebf\u7a0b\u6808\u7684\u6808\u9876\u3002<\/p>\n<pre><code class=\"language-c\" lang=\"c\">void Yield (){       \n\t\u627e\u5230\u4e0b\u4e00\u4e2a\u8981\u6267\u884c\u7684\u7ebf\u7a0b\u7684TCP: TCPn;\n    \u8bbe\u7f6e\u5f53\u524dTCP\u4e3a: TCPn;\n\tESP = TCPn.esp;  \/\/\u4fee\u6539\u6808\u6307\u9488\n\tjmp [TCPn.esp];  \/\/\u8df3\u8f6c\u5230 TCPn \u6808\u9876\u5b58\u653e\u7684\u5730\u5740\u5904\n}\n<\/code><\/pre>\n<p>\u8fd9\u65f6\u4e24\u4e2a\u7ebf\u7a0b\u7684\u6267\u884c\u60c5\u51b5\u5982\u4e0b\uff1a<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/picture.chentaiyang.space\/202307261248548.png\" referrerpolicy=\"no-referrer\" alt=\"img\"><\/p>\n<p>\u5728\u6267\u884c\u5b8cD()\u4e2d\u7684Yield ()\u540e\uff0c\u63a5\u7740\u5c31\u4f1a\u6267\u884cB\u51fd\u6570\u7684 \u201c}\u201d\uff0c\u8fd9\u65f6\u4f1a\u51fa\u6808\uff0c\u5e76\u5c06\u6808\u9876\u6570\u636e 204 \u8d4b\u7ed9 PC \u6307\u9488\uff0c\u53ef\u4ee5\u770b\u51fa\u8fd8\u662f\u5b58\u5728\u95ee\u9898\uff0c\u5e94\u8be5\u8981\u53bb\u6267\u884cA() \u7684\uff0c\u7ed3\u679c\u53c8\u8f6c\u56de\u4e86B()\u3002\u7a0d\u5fae\u4fee\u6539\u4e00\u4e0bYield () \u51fd\u6570\uff1a<\/p>\n<pre><code class=\"language-c\" lang=\"c\">void Yield (){       \n\t\u627e\u5230\u4e0b\u4e00\u4e2a\u8981\u6267\u884c\u7684\u7ebf\u7a0b\u7684TCP: TCPn;\n    \u8bbe\u7f6e\u5f53\u524dTCP\u4e3a: TCPn;\n\tESP = TCPn.esp;  \/\/\u4fee\u6539\u6808\u6307\u9488\n\t\/\/ jmp [TCPn.esp];  \/\/\u5220\u9664\u6b64\u884c\n}\n<\/code><\/pre>\n<p>\u4fee\u6539\u540e\u5206\u6790\uff1a\u5728\u6267\u884cD()\u4e2dYield\u51fd\u6570\u7684 \u201c}\u201d\uff0c\u8fd9\u65f6\u4f1a\u51fa\u6808\uff0c\u5e76\u5c06\u6808\u9876\u6570\u636e 204 \u8d4b\u7ed9 PC \u6307\u9488\uff0c\u7136\u540e\u7a0b\u5e8f\u8df3\u8f6c\u5230 204 \u5730\u5740\u5904\u7ee7\u7eed\u6267\u884c\uff0c\u7d27\u63a5\u7740\u5c31\u4f1a\u6267\u884cB\u51fd\u6570\u7684 \u201c}\u201d\uff0c\u8fd9\u65f6\u4f1a\u51fa\u6808\uff0c\u5e76\u5c06\u6808\u9876\u6570\u636e 104 \u8d4b\u7ed9 PC \u6307\u9488\uff0c\u7a0b\u5e8f\u8df3\u8f6c\u5230A()\u3002\u53ef\u4ee5\u770b\u51fa\u4fee\u6539\u540e\u7684Yield ()\u5207\u6362\u7684\u5f88\u5408\u9002\u3002<\/p>\n<p>\u5206\u6790\u5b8cYield()\u540e\uff0c\u5c31\u53ef\u4ee5\u8bbe\u8ba1\u51fa ThreadCreate() \u4e86\uff1a<\/p>\n<pre><code class=\"language-c\" lang=\"c\">\/\/ \u521b\u5efa\u4e00\u4e2a\u7ebf\u7a0b\uff0cfunc\u4e3a\u9700\u8981\u6267\u884c\u7684\u51fd\u6570\u7684\u51fd\u6570\u6307\u9488\nvoid ThreadCreate(func){\n    TCB *tcb = malloc();  \/\/ \u521b\u5efaTCB\n    *stack = malloc();    \/\/ \u5206\u914d\u7ebf\u7a0b\u7684\u6808\u7a7a\u95f4\n    *stack = func;        \/\/ \u5c06\u7ebf\u7a0b\u8d77\u59cb\u5730\u5740\u653e\u5165\u6808\u4e2d\n    tcb.esp = stack;      \/\/ \u4fee\u6539\u6808\u9876\u6307\u9488\n}\n<\/code><\/pre>\n<h3 id=\"22-\u7528\u6237\u7ea7\u7ebf\u7a0b\u5982\u4f55\u8bbe\u8ba1\">2.2 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