应用背景 单片机裸机已经跑了很多年，现在想在项目中用实时嵌入系统，考虑好久，最终选择的是UC/OS-III,希望对想我一样的初学者有所帮助，以后一起成长关键技术
UC/OS-III，纯净的模板
uC/OS-III(Micro C OS Three 微型的C 语言编写的操作系统第3版)是一个可升级的，可固化的，基于优先级的实时内核。它对任务的个数无限制。uC/OS-III 是一个第3 代的系统内核，支持现代的实时内核所期待的大部分功能。例如资源管理，同步，任务间的通信等等。然而，uC/OS-III 提供的特色功能在其它的实时内核中是找不到的，比如说完备的运行时间测量性能，直接地发送信号或者消息到任务，任务可以同时等待多个内核对象等。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001314s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.089920s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001149s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001955s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001164s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003768s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001011s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003489s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015206s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001313s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 217161 [ RunTime:0.001244s ]
