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普通码农和CTO之间的差距，就是这7点了 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...人喜欢用if来不停的判断，看起来就像C语言一样“二”。函数的执行结果并不是很明显，每次都要get一下才能拿到结果。所以我用异常来处理错误，如果出错则抛出“RuntimeException”；函数的执行结果通过函数的返回值返回。
这...
how to customize `show processlist` in mysql?
... from the command line interface, is the pager command.
eg
pager grep -v Sleep | more; show full processlist;
Then you can page through the results.
You can also look for certain users, IPs or queries with grep or sed in this way.
The pager command is persistent per session.
...
Run Cron job every N minutes plus offset
...
You can try: */5 * * * * sleep N; your job
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Bash script to set up a temporary SSH tunnel
... seconds to become available. My solution: while [ ! -e $ctrl_socket ]; do sleep 0.1; done
– Adam Wallner
Feb 11 '18 at 22:19
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How efficient is locking an unlocked mutex? What is the cost of a mutex?
...an not be obtained, a system call has to be performed to put the thread to sleep; that is obviously extremely slow (system calls are in the order of 10 mircoseconds). Normally that is not really a problem because that thread has to sleep anyway-- but it could be a problem with high contention where ...
How to make a Python script run like a service or daemon in Linux
... event loop (where your events are timer triggering, possibly, provided by sleep function).
I wouldn't recommend you to choose 2., because you would be, in fact, repeating cron functionality. The Linux system paradigm is to let multiple simple tools interact and solve your problems. Unless there...
写出高质量代码的10个Tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
...主要还是原生的测试框架不够方便，每跑一次用例需要在模拟器或者真机上运行，效率太低，也不方便在CI环境下自动构建单元测试，好在有Robolectric，能帮我们解决部分问题。
单元测试的一个非常显著的优点是，当你需要修改...
实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
... ngx.exit(ngx.HTTP_OK);
end
ngx.sleep(1);
end
ngx.say("YES");
ngx.exit(ngx.HTTP_OK);
';
}
...
}
注：为了处理服务端不知道客户端何时断开连接的情况，代码中引入超时...
如何查看Oracle用户的SQL执行历史记录？ - 数据库(内核) - 清泛网 - 专注C/...
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--开启附加日志
alter database add supplemental log data;
--模拟DML操作
conn p_chenming/...
SQL> select * from test2;
SQL> insert into test2 values(7,77);
SQL> commit;
conn / as sysdba
--切归档
SQL> alter system switch logfile;
SQL> select name,dest_id,thread#,sequen...
Is Disney's FastPass Valid and/or Useful Queue Theory
...ng visitors with some kind of priority queue. They don't block, they don't sleep, they spend money. It works because john uses it at 11:00 AM, joe uses it at 11:15 AM (or 11:01 am). Now, if everyone had a fast pass, the regular line would be much faster while most visitors spent more money on food a...