{"id":2308,"date":"2010-07-26T19:19:00","date_gmt":"2010-07-26T11:19:00","guid":{"rendered":"http:\/\/www.orczhou.com\/?p=2308"},"modified":"2012-03-25T20:48:35","modified_gmt":"2012-03-25T12:48:35","slug":"mysql-innodb-source-code-sync-3","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2010\/07\/mysql-innodb-source-code-sync-3\/","title":{"rendered":"MySQL\/InnoDB\u6e90\u4ee3\u7801\uff1a\u7ebf\u7a0b\u5e76\u53d1\u8bbf\u95ee\u63a7\u5236(\u518d\u7eed)"},"content":{"rendered":"

\u8fd9\u662f\u8be5\u7cfb\u5217\u7684\u7b2c\u4e09\u7bc7\u6587\u7ae0\uff081<\/a>\uff0c2<\/a>\uff09\u4e86\u3002\u4e4b\u6240\u4ee5\u9009\u62e9\u5e76\u53d1\u7ebf\u7a0b\u63a7\u5236\u7740\u624b\u7814\u7a76InnoDB\u7684\u4ee3\u7801\u6709\u4e24\u4e2a\u539f\u56e0\uff1a\u7b2c\u4e00\uff0c\u8fd9\u6bb5\u4ee3\u7801\u76f8\u5bf9\u72ec\u7acb\uff0c\u4e0d\u8981\u4e86\u89e3\u592a\u591a\u7684\u76f8\u5173\u4ee3\u7801\u5c31\u53ef\u4ee5\u7406\u89e3\uff1b\u7b2c\u4e8c\uff0c\u7a0d\u5fae\u591a\u770b\u4e00\u4e9b\u4ee3\u7801\u4f60\u4f1a\u53d1\u73b0\uff0c\u5230\u5904\u90fd\u662f\u7ebf\u7a0b\u5e76\u53d1\u63a7\u5236\u76f8\u5173\u7684\u4ee3\u7801\u51fa\u73b0\uff0c\u6240\u4ee5\u8fd9\u4e5f\u662f\u4e00\u4e2a\u57fa\u7840\u3002<\/p>\n

\u5728\u7b2c\u4e00\u7bc7<\/a>\u4e2d\uff0c\u4ecb\u7ecd\u4e86InnoDB\u5185\u90e8\u6392\u4ed6\u9501\u7684\u5b9e\u73b0\uff0c\u7b2c\u4e8c\u7bc7<\/a>\u5219\u4ecb\u7ecdInnoDB\u5185\u90e8<\/strong>\u8bfb\u5199\u9501\u7684\u5b9e\u73b0\u539f\u7406<\/strong>\uff08\u8fd9\u91cc\u8bf4\u7684\u201c\u5185\u90e8\u201d\u662f\u4e3a\u4e86\u533a\u522b\u4e8e\u6570\u636e\u5e93\u5c42\u9762\u7684\u8bfb\u5199\u9501\uff09\u3002\u672c\u7bc7\u5219\u5c06\u5ef6\u7eed\u7b2c\u4e8c\u7bc7<\/a>\uff0c\u4ecb\u7ecd\u8bfb\u5199\u9501\u76f8\u5173\u7684\u4ee3\u7801\u5b9e\u73b0\u3002<\/p>\n

1. \u57fa\u672c\u6570\u636e\u7ed3\u6784rw_lock_struct<\/div>\n

InnoDB\u8bfb\u5199\u9501\u6838\u5fc3\u7684\u6570\u636e\u7ed3\u6784\u662frw_lock_struct\uff0c\u4e0b\u9762\u5217\u51fa\u4e86\u4e3b\u8981\u7684\u6210\u5458\uff1a<\/p>\n

struct rw_lock_struct {\r\n\tvolatile lint\tlock_word;  \/\/\u6807\u8bb0\u8be5\u8bfb\u5199\u9501\u7684\u72b6\u6001\uff08\u53c2\u8003\uff09\r\n\tvolatile ulint\twaiters; \/\/\u5f53\u524d\u662f\u5426\u6709\u7b49\u5f85\u83b7\u53d6\u9501\u7684\u7ebf\u7a0b\r\n\tvolatile ibool\trecursive; \/\/\u6807\u8bb0\u8be5\u9501\u662f\u5426\u88ab\u9012\u5f52\u83b7\u53d6\r\n\tvolatile os_thread_id_t\twriter_thread; \/\/\u5982\u679c\u6709\u88ab\u4ee5\u5199\u9501\u65b9\u5f0f\u83b7\u53d6\uff0c\u5219\u8bb0\u5f55\u8be5\u8fdb\u7a0bID\uff08\u4e3a\u4e86\u9012\u5f52\u83b7\u53d6\uff09\r\n#ifndef INNODB_RW_LOCKS_USE_ATOMICS\r\n\tmutex_t\tmutex;\t\t\/\/\u7528\u6765\u4fdd\u62a4lock_word\u548c\u8be5\u7ed3\u6784\u7684\r\n#endif \r\n\t......<\/div><\/pre>\n
\u5982\u679c\u7406\u89e3\u4e86\u524d\u9762\u4ecb\u7ecd\u7684\u8bfb\u5199\u9501\u7684\u539f\u7406\u518d\u6765\u770brw_lock_struct\u7684\u7ed3\u6784\uff0c\u8fd8\u662f\u6bd4\u8f83\u7b80\u5355\u7684\u3002\u76f8\u5173\u7684\u521d\u59cb\u5316\u548c\u91ca\u653e\u51fd\u6570\u5206\u522b\u4e3arw_lock_create_func\u548crw_lock_free\uff0c\u4e5f\u90fd\u6bd4\u8f83\u7b80\u5355\u3002<\/p>\n
2. \u8bfb\u5199\u9501\u4e4b\u8bfb\u9501<\/strong><\/div>\n
\u8bfb\u9501\u5373\u4ee5\u5171\u4eab\u7684\u65b9\u5f0f\u83b7\u53d6\u9501\u3002\u5e95\u5c42\u5b9e\u73b0\u5f88\u7b80\u5355\uff1a\u5148\u67e5\u770block_word\u7684\u503c\u83b7\u53d6\u5f53\u524d\u9501\u7684\u72b6\u6001\uff0c\u5982\u679c\u5f53\u524d\u7ebf\u7a0b\u53ef\u4ee5\u83b7\u53d6\u8bfb\u9501\uff0c\u5219\u8c03\u7528\u51fd\u6570rw_lock_lock_word_decr\u4ee5\u6392\u4ed6\u65b9\u5f0f\uff0c\u66f4\u6539lock_word\u7684\u503c\uff0c\u8bfb\u9501\u5373\u5c06lock_word\u51cf\u4e00\u3002rw_lock_lock_word_decr\u7684\u5b9e\u73b0\u5728\u672c\u7cfb\u5217\u7684\u7b2c\u4e8c\u7bc7<\/a>\u4e2d\u5df2\u7ecf\u4ecb\u7ecd\u4e86\u3002\u5982\u679c\u68c0\u67e5lock_word\u53d1\u73b0\u5f53\u524d\u8fdb\u7a0b\u8fd8\u65e0\u6cd5\u83b7\u53d6\u8bfb\u9501\uff08\u4f8b\u5982\uff0c\u67d0\u4e2a\u7ebf\u7a0b\u4ee5\u5199\u9501\u65b9\u5f0f\u83b7\u53d6\u4e86\uff09\uff0c\u5219\u9009\u62e9\u7a7a\u5faa\u73af\u4e00\u6bb5\uff08spin\u4e00\u6bb5\uff09\uff0c\u7136\u540e\u518d\u575a\u6301lock_word\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u8bfb\u9501\u83b7\u53d6\u7684\u793a\u610f\u56fe\uff1a<\/p>\n
\"rw_lock_s_spin\"<\/a><\/p>\n
3. \u8bfb\u5199\u9501\u4e4b\u5199\u9501<\/strong><\/div>\n
\u8f83\u4e4b\u8bfb\u9501\uff0c\u5199\u9501\u591a\u4e86\u4e00\u4e2a\u9012\u5f52\u83b7\u53d6\uff0c\u5373\u5f53\u524d\u9501\u662f\u4ee5\u5199\u65b9\u5f0f\u88ab\u83b7\u53d6\u65f6\uff0c\u7ebf\u7a0b\u9700\u8981\u68c0\u67e5\u5f53\u524d\u9501\u6301\u6709\u8005\u7684\u7ebf\u7a0bID\uff0c\u5982\u679c\u662f\u81ea\u5df1\u5219\u53ef\u4ee5\u9012\u5f52\u83b7\u53d6\u5199\u9501\u3002<\/p>\n
\"rw_lock_x_spin\"<\/a><\/p>\n
\u5728\u4e0a\u9762\u7684\u793a\u610f\u56fe\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u5230\u5199\u9501\u83b7\u53d6\u65f6spin\u65f6\uff0c\u5f53spin\u4e86\u4e00\u5b9a\u56de\u5408\u540e\u7ebf\u7a0b\u4f1a\u9677\u5165\u7b49\u5f85\uff0c\u5f53\u5176\u4ed6\u7684\u7ebf\u7a0b\u91ca\u653e\u9501\u65f6\u5219\u4f1a\u5e7f\u64ad\u4e00\u6b21\u6d88\u606f\uff0c\u5f53\u524d\u7ebf\u7a0b\u4f1a\u88ab\u91cd\u65b0\u5524\u9192\uff0c\u7136\u540e\u7ee7\u7eedspin\u3002<\/p>\n
4. \u5c0f\u7ed3<\/div>\n
\u8fd9\u7bc7\u6587\u7ae0\u5c31\u8d34\u4e86\u8fd9\u4e48\u4e24\u5f20\u56fe…\uff0c\u53d1\u73b0\u5199\u6e90\u4ee3\u7801\u76f8\u5173\u7684\u6587\u7ae0\u786e\u5b9e\u5f88\u96be\uff1a\u5982\u679c\u6587\u5b57\u592a\u591a\u4e86\uff0c\u90a3\u4e48\u5c31\u662f\u4ecb\u7ecd\u539f\u7406\u4e86\uff1b\u5982\u679c\u4ee3\u7801\u592a\u591a\u4e86\uff0c\u96be\u514d\u4f1a\u67af\u71e5\uff0c\u6bd5\u7adf\u5927\u6bb5\u7684\u4ee3\u7801\u62c6\u5f00\u540e\u5c31\u6ca1\u6709\u4e86\u987a\u7545\u7684\u611f\u89c9\uff0c\u800c\u4e14\u6709\u5806\u9875\u6570\u4e4b\u5acc\uff08\u60f3\u60f3\u6bd5\u4e1a\u8bba\u6587\u5427\uff09\u3002\u8fd9\u91cc\u5c1d\u8bd5\u4e86\u4e00\u4e0b\u201c\u6d41\u7a0b\u56fe+\u90e8\u5206\u4ee3\u7801\u201d\u7684\u529e\u6cd5\uff0c\u8bd5\u8bd5\u3002<\/p>\n
\u4e24\u5f20\u793a\u610f\u56fe\u90fd\u662f\u653e\u5728Flickr<\/a>\u4e0a\u7684\uff0c\u529f\u592b\u7f51\u5bf9\u5979\u5f88\u4e0d\u53cb\u597d\uff0c\u6240\u4ee5\u770b\u5230\u539f\u56fe\u53ef\u80fd\u9700\u8981\u7ffb\u5899\u3002\u53e6\u5916\uff0c\u672c\u7f51\u7ad9\u4e5f\u5b58\u4e86\u4e00\u4efd\u989d\u5916\u7684\u62f7\u8d1d\uff1a\u56fe1<\/a>\uff0c\u56fe2<\/a>\u3002<\/p>\n
\u5e7f\u544a\u65f6\u95f4\uff1a\u5de5\u4f5c\u673a\u4f1a–MySQL Hacker<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u8fd9\u662f\u8be5\u7cfb\u5217\u7684\u7b2c\u4e09\u7bc7\u6587\u7ae0\uff081\uff0c2\uff09\u4e86\u3002\u4e4b\u6240\u4ee5\u9009\u62e9\u5e76\u53d1\u7ebf\u7a0b\u63a7\u5236\u7740\u624b\u7814\u7a76InnoDB\u7684\u4ee3\u7801\u6709\u4e24\u4e2a\u539f\u56e0\uff1a\u7b2c\u4e00\uff0c\u8fd9\u6bb5\u4ee3\u7801\u76f8\u5bf9\u72ec\u7acb\uff0c\u4e0d\u8981\u4e86\u89e3\u592a\u591a\u7684\u76f8\u5173\u4ee3\u7801\u5c31\u53ef\u4ee5\u7406\u89e3\uff1b\u7b2c\u4e8c\uff0c\u7a0d\u5fae\u591a\u770b\u4e00\u4e9b\u4ee3\u7801\u4f60\u4f1a\u53d1\u73b0\uff0c\u5230\u5904\u90fd\u662f\u7ebf\u7a0b\u5e76\u53d1\u63a7\u5236\u76f8\u5173\u7684\u4ee3\u7801\u51fa\u73b0\uff0c\u6240\u4ee5\u8fd9\u4e5f\u662f\u4e00\u4e2a\u57fa\u7840\u3002 \u5728\u7b2c\u4e00\u7bc7\u4e2d\uff0c\u4ecb\u7ecd\u4e86InnoDB\u5185\u90e8\u6392\u4ed6\u9501\u7684\u5b9e\u73b0\uff0c\u7b2c\u4e8c\u7bc7\u5219\u4ecb\u7ecdInnoDB\u5185\u90e8\u8bfb\u5199\u9501\u7684\u5b9e\u73b0\u539f\u7406\uff08\u8fd9\u91cc\u8bf4\u7684\u201c\u5185\u90e8\u201d\u662f\u4e3a\u4e86\u533a\u522b\u4e8e\u6570\u636e\u5e93\u5c42\u9762\u7684\u8bfb\u5199\u9501\uff09\u3002\u672c\u7bc7\u5219\u5c06\u5ef6\u7eed\u7b2c\u4e8c\u7bc7\uff0c\u4ecb\u7ecd\u8bfb\u5199\u9501\u76f8\u5173\u7684\u4ee3\u7801\u5b9e\u73b0\u3002<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","inline_featured_image":false,"_tocer_settings":[],"footnotes":""},"categories":[6,5],"tags":[120,118,58],"class_list":["post-2308","post","type-post","status-publish","format-standard","hentry","category-mysql","category-code-staff","tag-innodb","tag-mysql","tag-source-code"],"_links":{"self":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/2308","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/comments?post=2308"}],"version-history":[{"count":22,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/2308\/revisions"}],"predecessor-version":[{"id":3784,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/posts\/2308\/revisions\/3784"}],"wp:attachment":[{"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/media?parent=2308"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/categories?post=2308"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.orczhou.com\/index.php\/wp-json\/wp\/v2\/tags?post=2308"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}