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C++ SpinLock 自旋锁的代码实现（全网最简略的方式） - C/C++ - 清泛网 - ...
...ck;
thread thd([&]{
cout << "thread lock..." << endl;
lck.lock();
sleep(3);
cout << "thread unlock..." << endl;
lck.unlock();
});
thd.detach();
this_thread::sleep_for(chrono::milliseconds(50));
cout << "main thread lock... wait." << endl;
lck.lock();
cout << "SpinLock done." << ...
How do I close a connection early?
...ob_get_length();
header("Content-Length: $size");
ob_end_flush();
flush();
sleep(13);
error_log("do something in the background");
?>
Which works fine until you substitute phpinfo() for echo('text I want user to see'); in which case the headers are never sent!
The solution is to explic...
Dokan虚拟磁盘开发实战 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...DOKAN_FILE_INFO;
研究了几天，发现只需要实现少数几个回调函数就可以了：
1.FindFiles: 在这个回调函数里可以实现从远程目录同步其下的所有目录及文件。当然也可以在OpenDirectory回调函数里做，但实际使用时我发现OpenDirectory调用...
Linux C/C++程序常用的调试手段及异常排查总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...是否可以对职责场景覆盖全面？
代码规范
变量名、函数名、类名是否简单、精准的表达变量的含义？所有变量命名是否可以保持一致性？缩进，换行，可读性如何？
（驼峰、下划线，这个根据公司或者谷歌等的编码规范...
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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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...
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
...
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 ...
我帮儿子用App Inventor 2给遥控车装了"蓝牙大脑"，手机一划车就...
...
- BluetoothClient — 蓝牙连接与数据收发
- Canvas + Ball — 模拟方向盘
- Clock（定时器） — 方向盘位置到指令的轮询转换
- ListPicker — 显示已配对蓝牙设备列表
关键实现
第一步：蓝牙连接
当 Screen1.初始化
执行 Li...