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Is volatile expensive?
...Cookbook for Compiler Writers about the implementation of volatile, especially section "Interactions with Atomic Instructions" I assume that reading a volatile variable without updating it needs a LoadLoad or a LoadStore barrier. Further down the page I see that LoadLoad and LoadStore are effective...
Make a program run slowly
...er the priority using nice (and/or renice). You can also do it programmatically using nice() system call. This will not slow down the execution speed per se, but will make Linux scheduler allocate less (and possibly shorter) execution time frames, preempt more often, etc. See Process Scheduling (Cha...
How to throw an exception in C?
...and caught in the program, but the C code portions will remain ignorant of all of this going on except that exception throwing and catching often rely on functions written in C which reside in the C++ libraries. C is used because you can't risk the function called to do throw needing to throw an exc...
Difference between volatile and synchronized in Java
...om obtaining the monitor (or lock) for the same object, thereby preventing all code blocks protected by synchronization on the same object from executing concurrently. Synchronization also creates a "happens-before" memory barrier, causing a memory visibility constraint such that anything done up t...
网站伪静态Rewrite重写中文路径时乱码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...又是乱码，有时使用360乱码在ff浏览器所有搜索引擎都没问题了，为了解决这个问题下面我们来总结一下我的分析过程。转自：http://www.111cn.net/sys/Windows/55779.htm
一、问题的由来。
URL就是网址，只要上网，就一定会用到。
一...
Intel SMID指令集编译错误: inlining failed in call to always_inline \'x...
... target specific option mismatch xxxintel_smid_compile_error最近在使用CPU指令集优化代码的时候，编译出错，报错如下： usr lib64 gcc x86_64-suse-linux 7 include avx2intrin h:252:1: error: inlining failed in call to always_i 最近在使用CPU指令集优化代码的时候，...
Storing time-series data, relational or non?
... description, the actual PK is (Device, Metric, DateTime). (Please don't call it TimeStamp, that means something else, but that is a minor issue.) The uniqueness of the row is identified by:
(Device, Metric, DateTime)
The Id column does nothing, it is totally and completely redundant.
A...
Which is faster : if (bool) or if(int)?
...s a bool as an 8-bit value, and your system ABI requires it to "promote" small (< 32-bit) integer arguments to 32-bit when pushing them onto the call stack. So to compare a bool, the compiler generates code to isolate the least significant byte of the 32-bit argument that g receives, and compares...
TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展 · App Inventor 2 中文网
...I（Android >= 10）
最佳实践
故障排除
常见问题
开发信息
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TaifunWiFi 拓展：WiFi Manager WiFi管理器扩展
在无线局域网中使用的功能块。
.aix 拓展下载：
com.puravidaapps.Taifu...
What happens when a computer program runs?
...
It really depends on the system, but modern OSes with virtual memory tend to load their process images and allocate memory something like this:
+---------+
| stack | function-local variables, return addresses, return values, e...