{"id":5304,"date":"2026-02-09T19:18:14","date_gmt":"2026-02-09T11:18:14","guid":{"rendered":"https:\/\/www.yizishun.com\/?p=5304"},"modified":"2026-02-09T19:18:14","modified_gmt":"2026-02-09T11:18:14","slug":"ch3-%e5%a4%9a%e9%81%93%e7%a8%8b%e5%ba%8f%e4%b8%8e%e5%88%86%e6%97%b6%e5%a4%9a%e4%bb%bb%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.yizishun.com\/?p=5304","title":{"rendered":"Ch3 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once\u521d\u59cb\u5316\u5c31\u597d\uff0c\u7136\u540e\u5c31\u662f\u6bcf\u4e2aBlock\u4e86\uff0c\u6bcf\u4e2aBlock\u80af\u5b9a\u4e5f\u662f\u5bf9\u5e94\u7740\u6bcf\u4e2aapp\u7684\uff0c\u4ed6\u91cc\u9762\u6709\u4e00\u4e2a\u72b6\u6001\uff0c\u6709\u4e00\u4e2aTaskContext\uff0c\u73b0\u5728\u5c31\u662f\u60f3\u9700\u4e0d\u9700\u8981\u7ed9\u5b83\u4eec\u52a0\u9501<\/p>\n<p>\u5047\u8bbe\u4e24\u4e2ayield\u540c\u65f6\u53d1\u751f\uff0c\u7136\u540e\u4e5f\u6b63\u597d\u8fd8\u5269\u4e0b\u4e24\u4e2aready\u7684app\u5728Task\u91cc\u9762\uff0c\u5982\u679c\u4ec5\u4ec5\u662f\u540c\u6837\u7684find\uff0c\u4ed6\u4eec\u80af\u5b9a\u8fd4\u56de\u540c\u4e00\u4e2aready\u7684\u4f4d\u7f6e\uff0c\u5e76\u671f\u671b\u540c\u65f6\u4fee\u6539\u4ed6\u7684\u72b6\u6001\uff0c\u540c\u65f6\u5207\u6362\u8fc7\u53bb\uff0c\u90a3\u80af\u5b9a\u4f1a\u51fa\u95ee\u9898\uff0c\u611f\u89c9\u4e3b\u8981\u5c31\u662f\u8fd9\u4e2a\u72b6\u6001\u9700\u8981\u52a0\u9501\uff0c\u60f3\u60f3\uff0c\u5982\u679c\u662f\u4ed6\u662fatomic\uff0c\u4ec5\u4ec5\u53ea\u662f\u8ba9\u540c\u65f6\u8bfb\u53d6\u65f6\u8fdb\u884c\u540c\u6b65\uff0c\u4ed6\u4eec\u4f9d\u7136\u4f1a\u8ba4\u4e3a\u4ed6\u662fready\u7684\uff0c\u6700\u597d\u7684\u9700\u6c42\u5c31\u662f\uff0c\u8bfb\u53d6\u53d1\u73b0\u662fready\uff0c\u7acb\u9a6c\u7981\u6b62\u6240\u6709\u5176\u4ed6\u7684\u8bfb\u53d6\uff0c\u7136\u540e\u4fee\u6539\u4ed6\u4e3aruning\uff0c\u7136\u540e\u8fd4\u56de\u8fd9\u4e2aid\uff0c\u8fd9\u4e2a\u5c31\u662f\u9501\uff0c\u800c\u4e14\u662fMutex\u4e0d\u662fRwLock\uff0c\u7136\u540e\u5c31\u662fTaskContext\uff0cemmm\uff0c\u8c8c\u4f3c\u4e0d\u9700\u8981\u9501\uff0c\u4ed6\u7684atomic\u6709\u4e00\u4e2afetch_update\u7684\u51fd\u6570\uff0c\u8fd9\u4e2a\u51fd\u6570\u4f1a\u5148\u83b7\u53d6\u4ed6\u7684\u72b6\u6001\uff0c\u7136\u540e\u5e94\u7528\u4f60\u7ed9\u7684\u51fd\u6570\uff0c\u6bd4\u5982\u5224\u65ad\u662f\u5426\u662fready\uff0c\u7136\u540e\u8fdb\u884cCAS\uff08compare and swap\uff09\uff0c\u5373\u4ed6\u4f1a\u518d\u6b21load\u4ed6\u7684\u72b6\u6001\u5e76\u6bd4\u8f83\u662f\u5426\u548c\u4e4b\u524d\u7684\u76f8\u540c\uff0c\u5982\u679c\u76f8\u540c\u4ed6\u624d\u4f1a\u5c06\u4f60\u51fd\u6570\u7684\u8fd4\u56de\u503c\u5199\u5165\uff0c\u5426\u5219\u5c31\u4e00\u76f4\u5faa\u73af\u4f60\u8fd9\u4e2a\u8fc7\u7a0b\uff0c\u76f4\u5230\u4f60\u51fd\u6570\u8fd4\u56deNone\u6216\u8005\u5199\u5165\u6210\u529f\uff0c\u7136\u540e\u4ed6\u7b97\u662f<em>\u65e0\u9501\u5e76\u53d1<\/em>\u4e2d\u7684\u4e00\u79cd\uff0c\u8fd9\u4e5f\u53ef\u4ee5\u6210\u529fhandle\u4e0a\u8ff0\u4e3e\u7684\u4f8b\u5b50\uff0c\u7136\u540e\u5047\u5982\u6709\u4e09\u4e2ayield\u540c\u65f6\u53d1\u751f\uff0c\u4f1a\u6709\u4e00\u4e2a\u5168\u90e8\u4fee\u6539\u5931\u8d25\uff0c\u7136\u540e\u627e\u4e0d\u5230ready\u7684\uff0c\u4e8e\u662f\u4ed6\u5e94\u8be5\u76f4\u63a5\u6062\u590d\u5f53\u524dapp\uff08\u6216\u8005\u68c0\u67e5\u662f\u5426\u6709uninit\u7684\uff0c\u5982\u679c\u6709\u5c31\u505ainit\u5e76\u542f\u52a8\uff09<\/p>\n<p>\u7136\u540e\u5c31\u662fTaskContext\u9700\u8981\u4ec0\u4e48\u5305\u88f9\uff0c\u6309\u7406\u6765\u8bf4\u7684\u8bdd\uff0c\u5728\u4fee\u6539TaskContext\u4e4b\u524d\uff0c\u5fc5\u7136\u9700\u8981\u4f7f\u7528find\u6765\u627e\u5230\u4e00\u4e2aready\uff0c\u7136\u540e\u7528\u8fd9\u4e2aindex\u53bb\u8bfb\u53d6\u5bf9\u5e94\u7684context\uff0c\u7136\u540e\u4fee\u6539\u81ea\u5df1\u7684context\uff0c\u4f46\u662f\u8fd9\u5176\u5b9e\u4f9d\u8d56\u4e86\u8fd9\u4e2a\u884c\u4e3a\uff0c\u4f46\u662f\u8fd9\u4e2a\u4f9d\u8d56\u5e76\u6ca1\u6709\u8bed\u8a00\u7684\u4fdd\u8bc1\uff0c\u610f\u5473\u7740\u5bb9\u6613\u4f7f\u7528\u9519\u8bef\u7684index\uff0c\u4f46\u662f\u611f\u89c9\u5176\u5b9e\u6ca1\u5fc5\u8981\u505a\u4e00\u4e9b\u5176\u4ed6\u7684\u5de5\u4f5c\u635f\u5931\u6027\u80fd\uff0c\u4ec5\u4ec5\u8ba9\u4ed6\u53ea\u80fd\u88ab\u4e00\u4e2a\u51fd\u6570\u8bbf\u95ee\u5c31\u53ef\u4ee5\u4e86<\/p>\n<p>\u8fd9\u4e2a\u786e\u5b9a\u4e4b\u540e\uff0c\u5c31\u662f\u6574\u4e2atrap\u8fc7\u7a0b\uff0c\u9996\u5148fast trap\u53ea\u4f1a\u4fdd\u5b58\u4e00\u4e9ba\uff0ct\u4e4b\u7c7b\u7684\u5bc4\u5b58\u5668\uff0c\u7136\u540e\u8fdb\u5165yield syscall\u5904\u7406\u51fd\u6570\uff0c\u4f46\u662f\u8fd9\u4e2a\u5176\u5b9e\u662f\u9700\u8981\u9677\u5165\u5b8c\u6574\u8def\u5f84\u51fd\u6570\u7684\uff0c\u4e8e\u662f\u4fdd\u5b58\u6240\u6709\u901a\u7528\u5bc4\u5b58\u5668\uff08\u9664gp\uff09\uff0c\u8fdb\u5165\u771f\u6b63\u7684\u5904\u7406\u51fd\u6570\u4e4b\u540e\uff0c\u4fdd\u5b58task context\uff0c\u5e76\u6062\u590d\u65b0\u7684task context\uff0c\u5373switch\u51fd\u6570\u5b9e\u73b0\u6362\u6808\uff0cswitch\u51fd\u6570\u8fd4\u56de\u4f9d\u7136\u53ef\u4ee5\u518d\u6062\u590d\u7528\u6237\u6001\u7684\u6240\u6709\u5bc4\u5b58\u5668<\/p>\n<p>\u7136\u540e\u5927\u6982\u6709\u4e09\u4e2a\u5730\u65b9\u4f1a\u542f\u52a8\u7a0b\u5e8f\u8fd0\u884c<\/p>\n<ul>\n<li>\u9996\u5148\u5c31\u662f\u4e00\u5f00\u59cb\u7684\u65f6\u5019\uff0c\u6240\u6709harts\u542f\u52a8\u4ed6\u4eec\u7684\u7b2c\u4e00\u4e2a\u7a0b\u5e8f\u8fd0\u884c<\/li>\n<li>\u7136\u540e\u5c31\u662fyield\u7684\u65f6\u5019\uff0c\u5207\u6362\u7a0b\u5e8f\u8fd0\u884c<\/li>\n<li>\u4e4b\u540e\u5c31\u662f\u51fa\u73b0\u4e0d\u53ef\u6062\u590d\u5f02\u5e38\u7684\u65f6\u5019\u6216\u8005\u8c03\u7528exit\u7684\u65f6\u5019\uff0c\u9700\u8981\u542f\u52a8\u4e00\u4e2a\u65b0\u7a0b\u5e8f\u8fd0\u884c<\/li>\n<\/ul>\n<p>\u6240\u4ee5\u6211\u8981TaskManager\u63d0\u4f9b\u51e0\u4e2a\u65b9\u6cd5<code>suspend_current_and_run_next<\/code> \uff0c<code>exit_current_and_run_next<\/code>\uff0c<code>run_next_at_boot<\/code>\uff0c<code>run_next_at_trap<\/code>\uff0c\u524d\u4e24\u4e2a\u5185\u90e8\u90fd\u4f1a\u8c03\u7528\u6700\u540e\u4e00\u4e2a\uff0c\u6700\u540e\u4e00\u4e2a\u5185\u90e8\u4f1a\u8c03\u7528_switch\uff0c\u53bb\u5bfb\u627e\u4e00\u4e2aready\u7684\u5e76\u5207\u6362<\/p>\n<p>\u6240\u4ee5\u672c\u8d28\u4e0a\u5c31\u662f\u540e\u4e24\u4e2a\u51fd\u6570\uff0c\u9996\u5148\u5b9e\u73b0\u7b2c\u4e00\u4e2a\uff0c\u7b2c\u4e00\u4e2a\u8981\u505a\u7684\u5c31\u662f\u9996\u5148\u786e\u5b9a\u8981\u8fd0\u884c\u7684\u7a0b\u5e8f\uff0c\u7136\u540e\u4f9d\u7136\u662f\u53ef\u4ee5\u4f7f\u7528find\uff0c\u6765\u627e\u5230\u4e00\u4e2aready\u7684\u7a0b\u5e8f\u7136\u540e\u8fd4\u56de\uff0c\u6709app_id\uff0c\u5c31\u53ef\u4ee5\u521d\u59cb\u5316hart local\u7684app_info\uff0c\u7136\u540e\u53ef\u4ee5\u521d\u59cb\u5316user stack\uff0c\u53ef\u4ee5\u521d\u59cb\u5316sepc\uff0cstvec\uff0csstatus\uff0c\u7136\u540esret<\/p>\n<p>\u7136\u540e\u5c31\u662f\u7b2c\u4e8c\u4e2a\u51fd\u6570\uff0c\u9996\u5148\u4e5f\u662ffind\u627e\u5230\u4e0b\u4e00\u4e2a\u9700\u8981ready\u7684\u7a0b\u5e8f\uff0c\u7136\u540e\u8c03\u7528switch\uff0c\u8fd9\u5176\u5b9e\u8981\u6c42\u662f\u628a\u6240\u6709\u4e0a\u4e0b\u6587\u5168\u90e8\u4fdd\u5b58\u5728flowContext\u91cc\u9762\uff0c\u8fd9\u6837\u624d\u80fd\u5728\u5207\u6362\u4e4b\u540e\u6062\u590d\u6bd4\u5982\u8bf4sepc\u4e4b\u7c7b\u7684\u4e1c\u897f<\/p>\n<p>\u7136\u540e\u8981\u6ce8\u610f\u7684\u70b9\u662fswitch\u51fd\u6570\u4e0d\u80fd\u88ab\u6807\u8bb0\u4e3anaked\uff0c\u56e0\u4e3a\u6211\u4eec\u4f9d\u8d56\u7f16\u8bd1\u5668\u5e2e\u6211\u4eec\u4fdd\u5b58\u4e00\u4e9bcaller saved reg<\/p>\n<p>\u611f\u89c9\u5927\u8111\u91cc\u9700\u8981\u6709\u4e09\u4e2a\u56fe\uff0c\u7b2c\u4e00\u4e2a\u56fe\u662f\u5f53\u524d\u5728cpu\u91cc\u9762\u7684\u5bc4\u5b58\u5668\u7684\u56fe\uff0c\u5305\u62ecgpr\uff0ccsr\u7b49\u7b49\uff0c\u7136\u540e\u60f3\u8c61sp\u7684\u7bad\u5934\u6307\u5411\u7b2c\u4e8c\u56fe\uff0ckernel stack\u56fe\uff0c\u4ed6\u4e0a\u9762\u662fhart context\uff0c\u4e0b\u9762\u662ftrap_context\uff0c\u7136\u540e\u7b2c\u4e09\u4e2a\u5c31\u662ftask context\u7684\u56fe\uff0c\u5b9e\u9645\u4e0a\u4ed6\u672c\u8d28\u4e0a\u5c31\u662f\u5728trap\u65f6\u7528taskcontext\u6362\u6389trap\u7684gpr\uff0c\u5e76\u8bbe\u7f6e\u65b0\u7684csr\uff0c\u7136\u540e\u6b64\u65f6sp\u81ea\u7136\u5c31\u4f1a\u6307\u5411\u65b0\u7684kernel stack\uff0c\u7136\u540e\u6700\u540e\u6062\u590d\u518d\u7528flowcontext\u6362\u6389user\u7684gpr\uff0c\u5b9e\u73b0\u72f8\u732b\u6362\u592a\u5b50\uff0c\u7136\u540e\u6362\u6389\u4e4b\u540e\u4f1a\u51fa\u73b0\uff0c\u65b0\u7684kernel stack\u7684hart context\u7684\u67d0\u4e9b\u503c\u4e5f\u9700\u8981\u6362\u65b0\uff0c\u6bd4\u5982\u8bf4app info\u8fd9\u4e9b\u5c31\u4e0d\u8bf4\u4e86\uff0c\u6700\u4e3b\u8981\u7684\u662fhartid\u9700\u8981\u6362\u65b0\uff0c\u6211\u4e4b\u524d\u628atp\u5bc4\u5b58\u5668\u8bbe\u7f6e\u4e3a\u6307\u5411\u4e86\u539f\u6765kernel stack\uff0c\u4e8e\u662f\u5728\u6362\u6389\u4e4b\u540e\u4ed6\u4f9d\u7136\u6307\u5411\u539f\u6765kernel stack\uff0c\u6240\u4ee5\u53ef\u4ee5\u62ff\u51fatp\u7684\u503c\u91cc\u9762\u7684hartid\uff0c\u7136\u540e\u8bbe\u7f6e\u65b0\u7684kernel stack\u7684hartid\uff0c\u4f46\u662f\u53c8\u6709\u4e00\u4e2a\u65b0\u95ee\u9898\uff0c\u6211\u5982\u4f55\u77e5\u9053\u65b0\u7684kernel stack\u7684hartcontext\u7684\u4f4d\u7f6e\u5462\uff1f\u80fd\u5426\u5728taskcontext\u91cc\u9762\u65b0\u52a0\u4e00\u4e2atp\u7684\u4f4d\u7f6e\uff0c\u5728switch\u4e4b\u540e\u4f9d\u7136\u80fd\u6210\u529f\u83b7\u5f97hartcontext<\/p>\n<p>\u6240\u4ee5\u57fa\u672c\u5206\u4e3a<\/p>\n<ul>\n<li>task gpr\u6062\u590d\uff08\u6b64\u65f6\u6362\u65b0kernel stack\uff09<\/li>\n<li>\u65b0hart context\u521d\u59cb\u5316<\/li>\n<li>\u8bbe\u7f6e\u65b0\u7684sepc\uff0csscratch\uff08\u5373user stack\uff09<\/li>\n<li>flowcontext\u7684\u6062\u590d<\/li>\n<\/ul>\n<p>\u7136\u540e\u5c31\u6574\u4e2a\u6362\u65b0\u4e86<\/p>\n<p>\u4f46\u662f\u6211\u53d1\u73b0\u6211\u7684\u4ee3\u7801\u8c8c\u4f3c\u8fd8\u6709bug\uff0c\u5177\u4f53\u6765\u8bf4\u662f\u6211\u7684\u6bcf\u4e00\u4e2ahart\u4e00\u5f00\u59cb\u662f\u7528hartid\u6765\u9009\u4e00\u4e2akernel stack\uff0c\u4f46\u662fkernel stack\u539f\u672c\u7684\u8bbe\u8ba1\u662f\u548capp id\u4e00\u4e00\u5bf9\u5e94\u7684\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u53ef\u80fd\u4e00\u5f00\u59cb3\u53f7hart\u7528\u4e863\u53f7kernel stack\uff0c\u8fd0\u884c\u4e864\u53f7app\uff0c\u4f46\u662f\u5728init\u7684\u65f6\u5019\uff0c3\u53f7app\u7684task context\u4e2d\u7684sp\u662f\u6307\u54113\u53f7kernel 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privilege\u7684\u610f\u601d<\/li>\n<li>\u5982\u679c\u662f\u5185\u6838trap\uff0c\u5728trap\u7684\u5f00\u5934\u548c\u7ed3\u5c3e\u4e0d\u80fd\u6362\u6808<\/li>\n<\/ul>\n<p>\u65e2\u7136\u4e0d\u80fd\u6362\u6808\uff0c\u8fd8\u9700\u8981\u8fdb\u884c\u5224\u65ad\uff0c\u5c31\u9700\u8981\u62ff\u51fa\u4e00\u4e2a\u989d\u5916\u7684\u5bc4\u5b58\u5668\uff0c\u6211\u6253\u7b97\u4f7f\u7528gp\u5bc4\u5b58\u5668<\/p>\n<p>\u4e0d\u8fc7\u8c8c\u4f3c\u6211\u5982\u679c\u4e0d\u80fd\u6362\u6808\u4f1a\u6709\u4e00\u4e9b\u95ee\u9898\uff0c\u6211\u662f\u5728\u6808\u4e0a\u653e\u4e86\u4e00\u4e2a\u6307\u5411\u4e0a\u4e0b\u6587\u7684\u6307\u9488\uff0c\u5982\u679c\u4e0d\u6362\u6808\u610f\u5473\u7740\u4f1a\u628a\u4e4b\u524d\u7684\u5185\u6838\u4e0a\u4e0b\u6587\u8986\u76d6\u6389\u4e4b\u524d\u7684\u7528\u6237\u4e0a\u4e0b\u6587\uff0c\u6240\u4ee5\u8bf4\u5176\u5b9etrap\u8981\u8bb2\u7a76\u7a7a\u5165\u7a7a\u51fa\uff0c\u5373\u6bcf\u6b21trap\uff0c\u5fc5\u987b\u8fdb\u5165\u4e00\u4e2a\u7a7a\u7684stack<\/p>\n<h3>lv1\u8df3\u5165lv0<\/h3>\n<p>\u5d4c\u5957trap\u90a3\u5c31\u610f\u5473\u7740\u6bcf\u6b21\u6253\u5f00\u4e2d\u65ad\u65f6\u90fd\u9700\u8981\u81f3\u5c11\u5206\u914d\u4e00\u4e2a\u9677\u5165\u6808\uff0c\u5982\u679c\u5c06\u7528\u6237\u7684\u63a7\u5236\u6d41\u79f0\u4e3alv0\uff0c\u7b2c\u4e00\u6b21\u9677\u5165\u7684\u53eb\u505alv1\uff0c\u7136\u540e\u4e4b\u540e\u7684\u6240\u6709\u5d4c\u5957\u53ef\u4ee5\u88ab\u53eb\u505alv2\uff0c\u5728boot\u524d\uff0ckernel\u4fdd\u8bc1\u4e0d\u4f1a\u6253\u5f00\u4e2d\u65ad\uff0c\u7136\u540e\u4ed6\u5c06\u5f53\u524d\u4f7f\u7528\u7684\u9677\u5165\u6808\u653e\u8fdbsscratch\uff0c\u7136\u540e\u8df3\u5165lv0\uff0c\u4e4b\u540e\u8df3\u56de\u6765\uff0c\u6362\u6808\uff0c\u7528\u6237\u7684\u6808\u8fdb\u5165sscratch\uff0c\u5728\u5f00\u5934\u548c\u7ed3\u5c3e\u90fd\u4f1a\u6709\u4e00\u4e2aexchange\uff0c\u8fd9\u6ca1\u95ee\u9898<\/p>\n<h3>lv1\u8df3\u5165lv2<\/h3>\n<h4>\u51c6\u5907\u8df3\u5165<\/h4>\n<p>lv1\u8df3\u5165lv2: 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