{"id":1582,"date":"2010-10-05T09:28:32","date_gmt":"2010-10-05T01:28:32","guid":{"rendered":"http:\/\/edsionte.com\/techblog\/?p=1582"},"modified":"2010-10-06T19:30:34","modified_gmt":"2010-10-06T11:30:34","slug":"%e4%b8%ad%e6%96%ad%e4%b8%8b%e5%8d%8a%e9%83%a8-%e5%b7%a5%e4%bd%9c%e9%98%9f%e5%88%97","status":"publish","type":"post","link":"http:\/\/edsionte.com\/techblog\/archives\/1582","title":{"rendered":"\u4e2d\u65ad\u4e0b\u534a\u90e8-\u5de5\u4f5c\u961f\u5217"},"content":{"rendered":"

\u672c\u6587\u5305\u542b\u90a3\u4e9b\u5185\u5bb9\uff1f<\/em><\/strong>
\n<\/em><\/strong> \u5de5\u4f5c\u961f\u5217\u548ctasklet\u7684\u533a\u522b\uff1b\u4e2d\u65ad\u4e0a\u4e0b\u6587\uff1b\u5de5\u4f5c\u961f\u5217\u7684\u4f7f\u7528\uff1b<\/em><\/strong>
\n<\/em><\/strong> \u672c\u6587\u9002\u5408\u90a3\u4e9b\u4eba\u9605\u8bfb\uff1f<\/em><\/strong>
\n<\/em><\/strong> \u60f3\u4e86\u89e3linuxer\uff1b\u5b66\u4e60\u9a71\u52a8\u5f00\u53d1\u7684beginner\uff1b\u5b66\u4e60\u5185\u6838\u6a21\u5757\u7f16\u7a0bbeginner\uff1b\u5176\u4ed6super linux NBer\uff1b<\/em><\/strong>
\n<\/em><\/strong> \u53c2\u8003\u4e66\u7c4d\uff1a<\/em><\/strong>
\n<\/em><\/strong> Linux\u5185\u6838\u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/em><\/strong><\/a>
\n<\/em><\/strong> Linux\u64cd\u4f5c\u7cfb\u7edf\u539f\u7406\u4e0e\u5e94\u7528<\/em><\/strong><\/a>
\n<\/p>\n

\u4e3a\u4ec0\u4e48\u8fd8\u9700\u8981\u5de5\u4f5c\u961f\u5217\uff1f<\/h4>\n

<\/strong>
\n\u5de5\u4f5c\u961f\u5217\uff08work queue\uff09\u662f\u53e6\u5916\u4e00\u79cd\u5c06\u4e2d\u65ad\u7684\u90e8\u5206\u5de5\u4f5c\u63a8\u540e\u7684\u4e00\u79cd\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u5b9e\u73b0\u4e00\u4e9btasklet\u4e0d\u80fd\u5b9e\u73b0\u7684\u5de5\u4f5c\uff0c\u6bd4\u5982\u5de5\u4f5c\u961f\u5217\u673a\u5236\u53ef\u4ee5\u7761\u7720\u3002\u8fd9\u79cd\u5dee\u5f02\u7684\u672c\u8d28\u539f\u56e0\u662f\uff0c\u5728\u5de5\u4f5c\u961f\u5217\u673a\u5236\u4e2d\uff0c\u5c06\u63a8\u540e\u7684\u5de5\u4f5c\u4ea4\u7ed9\u4e00\u4e2a\u79f0\u4e4b\u4e3a\u5de5\u4f5c\u8005\u7ebf\u7a0b\uff08worker thread\uff09\u7684\u5185\u6838\u7ebf\u7a0b\u53bb\u5b8c\u6210\uff08\u5355\u6838\u4e0b\u4e00\u822c\u4f1a\u4ea4\u7ed9\u9ed8\u8ba4\u7684\u7ebf\u7a0bevents\/0\uff09\u3002\u56e0\u6b64\uff0c\u5728\u8be5\u673a\u5236\u4e2d\uff0c\u5f53\u5185\u6838\u5728\u6267\u884c\u4e2d\u65ad\u7684\u5269\u4f59\u5de5\u4f5c\u65f6\u5c31\u5904\u5728\u8fdb\u7a0b\u4e0a\u4e0b\u6587\uff08process context\uff09\u4e2d\u3002\u4e5f\u5c31\u662f\u8bf4\u7531\u5de5\u4f5c\u961f\u5217\u6240\u6267\u884c\u7684\u4e2d\u65ad\u4ee3\u7801\u4f1a\u8868\u73b0\u51fa\u8fdb\u7a0b\u7684\u4e00\u4e9b\u7279\u6027\uff0c\u6700\u5178\u578b\u7684\u5c31\u662f\u53ef\u4ee5\u91cd\u65b0\u8c03\u5ea6\u751a\u81f3\u7761\u7720\u3002<\/p>\n

\u5bf9\u4e8etasklet\u673a\u5236\uff08\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\u4e5f\u662f\u5982\u6b64\uff09\uff0c\u5185\u6838\u5728\u6267\u884c\u65f6\u5904\u4e8e\u4e2d\u65ad\u4e0a\u4e0b\u6587\uff08interrupt context\uff09\u4e2d\u3002\u800c\u4e2d\u65ad\u4e0a\u4e0b\u6587\u4e0e\u8fdb\u7a0b\u6beb\u65e0\u74dc\u845b\uff0c\u6240\u4ee5\u5728\u4e2d\u65ad\u4e0a\u4e0b\u6587\u4e2d\u5c31\u4e0d\u80fd\u7761\u7720\u3002<\/p>\n

\u56e0\u6b64\uff0c\u9009\u62e9tasklet\u8fd8\u662f\u5de5\u4f5c\u961f\u5217\u6765\u5b8c\u6210\u4e0b\u534a\u90e8\u5206\u5e94\u8be5\u4e0d\u96be\u9009\u62e9\u3002\u5f53\u63a8\u540e\u7684\u90a3\u90e8\u5206\u4e2d\u65ad\u7a0b\u5e8f\u9700\u8981\u7761\u7720\u65f6\uff0c\u5de5\u4f5c\u961f\u5217\u6beb\u65e0\u7591\u95ee\u662f\u4f60\u7684\u6700\u4f73\u9009\u62e9\uff1b\u5426\u5219\uff0c\u8fd8\u662f\u7528tasklet\u5427\u3002
\n<\/p>\n

\u4e2d\u65ad\u4e0a\u4e0b\u6587<\/h4>\n

<\/strong>
\n\u5728\u4e86\u89e3\u4e2d\u65ad\u4e0a\u4e0b\u6587\u65f6\uff0c\u5148\u6765\u56de\u987e\u53e6\u4e00\u4e2a\u719f\u6089\u6982\u5ff5\uff1a\u8fdb\u7a0b\u4e0a\u4e0b\u6587\uff08\u8fd9\u4e2a\u4e2d\u6587\u7ffb\u8bd1\u771f\u7684\u4e0d\u662f\u5f88\u597d\u7406\u89e3\uff0c\u7528\u201c\u73af\u5883\u201d\u6bd4\u5b83\u597d\u5f88\u591a\uff09\u3002\u4e00\u822c\u7684\u8fdb\u7a0b\u8fd0\u884c\u5728\u7528\u6237\u6001\uff0c\u5982\u679c\u8fd9\u4e2a\u8fdb\u7a0b\u8fdb\u884c\u4e86\u7cfb\u7edf\u8c03\u7528\uff0c\u90a3\u4e48\u6b64\u65f6\u7528\u6237\u7a7a\u95f4\u4e2d\u7684\u7a0b\u5e8f\u5c31\u8fdb\u5165\u4e86\u5185\u6838\u7a7a\u95f4\uff0c\u5e76\u4e14\u79f0\u5185\u6838\u4ee3\u8868\u8be5\u8fdb\u7a0b\u8fd0\u884c\u4e8e\u5185\u6838\u7a7a\u95f4\u4e2d\u3002\u7531\u4e8e\u7528\u6237\u7a7a\u95f4\u548c\u5185\u6838\u7a7a\u95f4\u5177\u6709\u4e0d\u540c\u7684\u5730\u5740\u6620\u5c04\uff0c\u5e76\u4e14\u7528\u6237\u7a7a\u95f4\u7684\u8fdb\u7a0b\u8981\u4f20\u9012\u5f88\u591a\u53d8\u91cf\u3001\u53c2\u6570\u7ed9\u5185\u6838\uff0c\u5185\u6838\u4e5f\u8981\u4fdd\u5b58\u7528\u6237\u8fdb\u7a0b\u7684\u4e00\u4e9b\u5bc4\u5b58\u5668\u3001\u53d8\u91cf\u7b49\uff0c\u4ee5\u4fbf\u7cfb\u7edf\u8c03\u7528\u7ed3\u675f\u540e\u56de\u5230\u7528\u6237\u7a7a\u95f4\u7ee7\u7eed\u6267\u884c\u3002\u8fd9\u6837\u5c31\u4ea7\u751f\u4e86\u8fdb\u7a0b\u4e0a\u4e0b\u6587\u3002<\/p>\n

\u6240\u8c13\u7684\u8fdb\u7a0b\u4e0a\u4e0b\u6587\uff0c\u5c31\u662f\u4e00\u4e2a\u8fdb\u7a0b\u5728\u6267\u884c\u7684\u65f6\u5019\uff0cCPU\u7684\u6240\u6709\u5bc4\u5b58\u5668\u4e2d\u7684\u503c\u3001\u8fdb\u7a0b\u7684\u72b6\u6001\u4ee5\u53ca\u5806\u6808\u4e2d\u7684\u5185\u5bb9\u3002\u5f53\u5185\u6838\u9700\u8981\u5207\u6362\u5230\u53e6\u4e00\u4e2a\u8fdb\u7a0b\u65f6\uff08\u4e0a\u4e0b\u6587\u5207\u6362\uff09\uff0c\u5b83\u9700\u8981\u4fdd\u5b58\u5f53\u524d\u8fdb\u7a0b\u7684\u6240\u6709\u72b6\u6001\uff0c\u5373\u4fdd\u5b58\u5f53\u524d\u8fdb\u7a0b\u7684\u8fdb\u7a0b\u4e0a\u4e0b\u6587\uff0c\u4ee5\u4fbf\u518d\u6b21\u6267\u884c\u8be5\u8fdb\u7a0b\u65f6\uff0c\u80fd\u591f\u6062\u590d\u5207\u6362\u65f6\u7684\u72b6\u6001\u7ee7\u7eed\u6267\u884c\u3002\u4e0a\u8ff0\u6240\u8bf4\u7684\u5de5\u4f5c\u961f\u5217\u6240\u8981\u505a\u7684\u5de5\u4f5c\u90fd\u4ea4\u7ed9\u5de5\u4f5c\u8005\u7ebf\u7a0b\u6765\u5904\u7406\uff0c\u56e0\u6b64\u5b83\u53ef\u4ee5\u8868\u73b0\u51fa\u8fdb\u7a0b\u7684\u4e00\u4e9b\u7279\u6027\uff0c\u6bd4\u5982\u8bf4\u53ef\u4ee5\u7761\u7720\u7b49\u3002<\/p>\n

\u5bf9\u4e8e\u4e2d\u65ad\u800c\u8a00\uff0c\u662f\u786c\u4ef6\u901a\u8fc7\u89e6\u53d1\u4fe1\u53f7\uff0c\u5bfc\u81f4\u5185\u6838\u8c03\u7528\u4e2d\u65ad\u5904\u7406\u7a0b\u5e8f\uff0c\u8fdb\u5165\u5185\u6838\u7a7a\u95f4\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u786c\u4ef6\u7684\u4e00\u4e9b\u53d8\u91cf\u548c\u53c2\u6570\u4e5f\u8981\u4f20\u9012\u7ed9\u5185\u6838\uff0c\u5185\u6838\u901a\u8fc7\u8fd9\u4e9b\u53c2\u6570\u8fdb\u884c\u4e2d\u65ad\u5904\u7406\uff0c\u4e2d\u65ad\u4e0a\u4e0b\u6587\u5c31\u53ef\u4ee5\u7406\u89e3\u4e3a\u786c\u4ef6\u4f20\u9012\u8fc7\u6765\u7684\u8fd9\u4e9b\u53c2\u6570\u548c\u5185\u6838\u9700\u8981\u4fdd\u5b58\u7684\u4e00\u4e9b\u73af\u5883\uff0c\u4e3b\u8981\u662f\u88ab\u4e2d\u65ad\u7684\u8fdb\u7a0b\u7684\u73af\u5883\u3002\u56e0\u6b64\u5904\u4e8e\u4e2d\u65ad\u4e0a\u4e0b\u6587\u7684tasklet\u4e0d\u4f1a\u6709\u7761\u7720\u8fd9\u6837\u7684\u7279\u6027\u3002
\n<\/p>\n

\u5de5\u4f5c\u961f\u5217\u7684\u4f7f\u7528<\/h4>\n

<\/strong>
\n\u5185\u6838\u4e2d\u901a\u8fc7\u4e0b\u8ff0\u7ed3\u6784\u4f53\u6765\u8868\u793a\u4e00\u4e2a\u5177\u4f53\u7684\u5de5\u4f5c\uff1a<\/p>\n

struct work_struct\r\n{\r\n\tunsigned long pending;\/\/\u8fd9\u4e2a\u5de5\u4f5c\u662f\u5426\u6b63\u5728\u7b49\u5f85\u5904\u7406\r\n\tstruct list_head entry;\/\/\u94fe\u63a5\u6240\u6709\u5de5\u4f5c\u7684\u94fe\u8868\uff0c\u5f62\u6210\u5de5\u4f5c\u961f\u5217\r\n\tvoid (*func)(void *);\/\/\u5904\u7406\u51fd\u6570\r\n\tvoid *data;\/\/\u4f20\u9012\u7ed9\u5904\u7406\u51fd\u6570\u7684\u53c2\u6570\r\n\tvoid *wq_data;\/\/\u5185\u90e8\u4f7f\u7528\u6570\u636e\r\n\tstruct timer_list timer;\/\/\u5ef6\u8fdf\u7684\u5de5\u4f5c\u961f\u5217\u6240\u7528\u5230\u7684\u5b9a\u65f6\u5668\r\n};<\/pre>\n
\u800c\u8fd9\u4e9b\u5de5\u4f5c\uff08\u7ed3\u6784\u4f53\uff09\u94fe\u63a5\u6210\u7684\u94fe\u8868\u5c31\u662f\u6240\u8c13\u7684\u5de5\u4f5c\u961f\u5217\u3002\u5de5\u4f5c\u8005\u7ebf\u7a0b\u4f1a\u5728\u88ab\u5524\u9192\u65f6\u6267\u884c\u94fe\u8868\u4e0a\u7684\u6240\u6709\u5de5\u4f5c\uff0c\u5f53\u4e00\u4e2a\u5de5\u4f5c\u88ab\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u76f8\u5e94\u7684work_struct\u7ed3\u6784\u4f53\u4e5f\u4f1a\u88ab\u5220\u9664\u3002\u5f53\u8fd9\u4e2a\u5de5\u4f5c\u94fe\u8868\u4e0a\u6ca1\u6709\u5de5\u4f5c\u65f6\uff0c\u5de5\u4f5c\u7ebf\u7a0b\u5c31\u4f1a\u4f11\u7720\u3002<\/p>\n
\u901a\u8fc7\u5982\u4e0b\u5b8f\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u8981\u63a8\u540e\u7684\u5b8c\u6210\u7684\u5de5\u4f5c:<\/p>\n
DECLARE_WORK(name,void(*func)(void*),void *data);<\/pre>\n
\u4e5f\u53ef\u4ee5\u901a\u8fc7\u4e0b\u8ff0\u5b8f\u52a8\u6001\u521b\u5efa\u4e00\u4e2a\u5de5\u4f5c:<\/p>\n
INIT_WORK(struct work_struct *work,void(*func)(void*),void *data);<\/pre>\n
\u4e0etasklet\u7c7b\u4f3c\uff0c\u6bcf\u4e2a\u5de5\u4f5c\u90fd\u6709\u5177\u4f53\u7684\u5de5\u4f5c\u961f\u5217\u5904\u7406\u51fd\u6570\uff0c\u539f\u578b\u5982\u4e0b:<\/p>\n
void work_handler(void *data)<\/pre>\n
\u5c06\u5de5\u4f5c\u961f\u5217\u673a\u5236\u5bf9\u5e94\u5230\u5177\u4f53\u7684\u4e2d\u65ad\u7a0b\u5e8f\u4e2d\uff0c\u5373\u90a3\u4e9b\u88ab\u63a8\u540e\u7684\u5de5\u4f5c\u5c06\u4f1a\u5728func\u6240\u6307\u5411\u7684\u90a3\u4e2a\u5de5\u4f5c\u961f\u5217\u5904\u7406\u51fd\u6570\u4e2d\u88ab\u6267\u884c\u3002<\/p>\n
\u5b9e\u73b0\u4e86\u5de5\u4f5c\u961f\u5217\u5904\u7406\u51fd\u6570\u540e\uff0c\u5c31\u9700\u8981schedule_work\u51fd\u6570\u5bf9\u8fd9\u4e2a\u5de5\u4f5c\u8fdb\u884c\u8c03\u5ea6\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a<\/p>\n
schedule_work(&work);<\/pre>\n
\u8fd9\u6837work\u4f1a\u9a6c\u4e0a\u5c31\u88ab\u8c03\u5ea6\uff0c\u4e00\u65e6\u5de5\u4f5c\u7ebf\u7a0b\u88ab\u5524\u9192\uff0c\u8fd9\u4e2a\u5de5\u4f5c\u5c31\u4f1a\u88ab\u6267\u884c\uff08\u56e0\u4e3a\u5176\u6240\u5728\u5de5\u4f5c\u961f\u5217\u4f1a\u88ab\u6267\u884c\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u672c\u6587\u5305\u542b\u90a3\u4e9b\u5185\u5bb9\uff1f \u5de5\u4f5c\u961f\u5217\u548ctasklet\u7684\u533a\u522b\uff1b\u4e2d\u65ad\u4e0a\u4e0b\u6587\uff1b\u5de5\u4f5c\u961f\u5217\u7684\u4f7f\u7528\uff1b \u672c\u6587\u9002\u5408\u90a3\u4e9b\u4eba\u9605\u8bfb\uff1f \u60f3\u4e86\u89e3 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[108,157,147],"class_list":["post-1582","post","type-post","status-publish","format-standard","hentry","category-linux","tag-linux","tag-157","tag-147"],"views":20710,"_links":{"self":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1582","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/comments?post=1582"}],"version-history":[{"count":0,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/posts\/1582\/revisions"}],"wp:attachment":[{"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/media?parent=1582"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/categories?post=1582"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/edsionte.com\/techblog\/wp-json\/wp\/v2\/tags?post=1582"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}