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C# Thread safe fast(est) counter
...d" to (x64).
This "bus lock" statement locks the bus to prevent another CPU from accessing the bus while the calling CPU does its operation. Now, take a look at the C# lock() statement's IL. Here you will see calls to Monitor in order to begin or end a section.
In other words, .Net lock() stat...
Timer & TimerTask versus Thread + sleep in Java
...And it deals better with multithreading issues (such as avoiding deadlocks etc.). And of course it is usually better to use well-tested standard code instead of some homemade solution.
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impro...
手机蓝牙控制台灯：HC-05 开关、无级调光、定时关灯（附 .aia 源码与单片机...
...块调光：节流发送
按行接收单片机回报
常见问题
用到的组件
验证范围
蓝牙台灯：手机通过 HC-05 / HC-06 经典蓝牙控制一盏台灯——开关、拖动滑块无级调光、三档预设、定时关灯，单片机每次执行后回报当前...
What are Transient and Volatile Modifiers?
...le variable will be read from the computer's main memory, and not from the CPU cache, and that every write to a volatile variable will be written to main memory, and not just to the CPU cache.
2) transient keyword cannot be used along with static keyword but volatile can be used along with static.
...
What do people find difficult about C pointers? [closed]
...ng a bit too deep in their answers. An understanding of scheduling, actual CPU operations, or assembly-level memory management isn't really required.
When I was teaching, I found the following holes in students' understanding to be the most common source of problems:
Heap vs Stack storage. It is ...
把数据保存成 CSV 文件并分享出去 · App Inventor 2 中文网
...带上日期，附一句说明
实验五：把 CSV 读回列表
常见问题
平台说明
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有用户问：App 里记了一堆数据（记账、打卡、测量值），想导出成一个 CSV 文件，再通过微信、QQ 或邮件发给别人，用电脑上的...
App Inventor 2 动态图表教程 - ECharts与Chart组件实现实时曲线图 · App Inventor 2 中文网
...测折线图
功能需求
积木块代码
常见问题
Q1: Chart组件数据多了会卡顿？
Q2: ECharts图表在WebView中显示不全？
Q3: 如何实现饼图/柱状图？
Q4: 图表可以导出为图片吗？
总结
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HashSet vs. List performance
...
@hypehuman the CPU cannot work directly on data in the system memory but pulls in data from the memory into its cache to work on. There is a significant delay between the request for memory to be moved and the memory actually arriving so th...
What are the pros and cons of performing calculations in sql vs. in your application
...tatements to avoid unnecessary data access)
don't push the database to its CPU limits with complex, concurrent calculations (in favour of pulling data into application memory and performing calculations there)
In my experience, with a decent DBA and some decent knowledge about your decent database...
Macro vs Function in C
...hort _square_us(unsigned short a) { return a * a; }
/* ... long, char ... etc */
#define square(a) \
_Generic((a), \
float: _square_fl(a), \
double: _square_dbl(a), \
int: _square_i(a), \
...