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C++ Lock-free Hazard Pointer（冒险指针） - C/C++ - 清泛网 - 专注C/C++及内核技术
...每次读取都需要修改引用计数，高并发场景下这样的原子操作也会成为性能瓶颈，毕竟原子加对应的 CPU 指令 lock add 也可以看成是微型锁。
Linux 内核中提供了 RCU 方法，笔者目前对此还没有太多的了解。本文主要介绍 Hazard Pointe...
“Insufficient Storage Available” even there is lot of free space in device memory
... sure Superuser and Terminal Emulator apps are installed. (They come with most custom ROMs.)
Run Terminal Emulator
Type in su, hit return.
This will bring up a Superuser prompt. Grant access. (You will have to wait three seconds before you can click "Allow".)
Change current directory by typing in cd...
How to list active / open connections in Oracle?
... substr(b.username,1,10) username,
-- b.server,
substr(b.osuser,1,8) os_user,
substr(b.program,1,30) program
from v$session b, v$process a
where
b.paddr = a.addr
and type='USER'
order by spid;
shar...
MySQL一次主从数据不一致的问题解决过程 - 数据库(内核) - 清泛网 - 专注C/...
...原理
用pt-table-sync修复不一致的数据 描述了工具原理
操作过程
只把过程和用到的东西解释了下，有些参数选项等还需要查阅文档。两台机器都是centos6.5 mysql版本都是5.6 , 由于是线上环境，这里ip和密码等敏感信息修改了下。...
Open new Terminal Tab from command line (Mac OS X)
Is it possible to open a new tab in Mac OS X's terminal from the command line in a currently opened tab?
13 Answers
...
When I catch an exception, how do I get the type, file, and line number?
...
import sys, os
try:
raise NotImplementedError("No error")
except Exception as e:
exc_type, exc_obj, exc_tb = sys.exc_info()
fname = os.path.split(exc_tb.tb_frame.f_code.co_filename)[1]
print(exc_type, fname, exc_tb.tb_li...
App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...持播放控制
【唤醒】KeepAwake 保持唤醒扩展：防止App被操作系统停用
【唤醒】WakeLock 扩展：保持设备唤醒扩展，防止系统休眠和电池优化
【传感器保持】SensorUtil 传感器工具扩展：在后台和屏幕关闭时保持传感器工作
【手...
怎么往SetTimer的回调函数传递参数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...息，然后处理之，这个过程有两个参与者，一 个是windows系统，它主要负责投递消息，收不收是用户线程的事，另一个就是用户线程，它主要负责取出消息并处理消息，即使用户线程因为睡眠或者根本 就没有设定消息循环，系统...
Can't find the 'libpq-fe.h header when trying to install pg gem
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:
...
Location Services not working in iOS 8
My app that worked fine on iOS 7 doesn't work with the iOS 8 SDK.
26 Answers
26
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