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Avoiding recursion when reading/writing a port synchronously?
...1 can set some global lock state i.e. with a variable (be sure that it's thread safe). locked = true. Then Communication2 can wait until it's unlocked.
loop do
sleep 10ms
break if not locked
end
locked = true
handle_communication()
...
HTTPKeepAlive，开启还是关闭 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...96
server accepts handled requests
66542336512 66542336512 67713042963
Reading: 1945 Writing: 82 Waiting: 93869
其中，各项结果的含义如下：
Active connections: number of all open connections
Server accepts handled requests: nginx accepted 66542336512 connections, handled 6654233...
串口Read不到数据的问题 - 用户反馈 - 清泛IT社区，为创新赋能！
用户发送的是 8n1 的格式，但是ai2的串口貌似不支持这种格式。写串口正常，读串口为空，len为0。
目前经过测试验证，应该是 \n 作为结束符的。发送时，也是。
ai2使用 physicaloid 库完成的串口功能。
Pro Camera 扩展：专业级自定义相机，提供滤镜、降噪、对焦等高级功能 · A...
...
属性
IsFlashAvailable 闪光灯可用 {:.boolean .read-only}
返回设备是否支持闪光灯功能。
IsFocusAvailable 对焦可用 {:.boolean .read-only}
返回设备是否支持自动对焦功能。
IsZoomAvailable 缩放可用 {:.boolean .read-only}
返回设...
detect key press in python?
...
"To avoid depending on X, the Linux parts reads raw device files (/dev/input/input*) but this requries root."
– jrouquie
Aug 6 '18 at 13:39
8
...
How to read if a checkbox is checked in PHP?
How to read if a checkbox is checked in PHP?
18 Answers
18
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Maven: Failed to read artifact descriptor
... of the child projects may depend on a sibling project and when it goes to read the pom of the sibling, it will fail with the error mentioned in the question unless you have installed from the parent pom directory at least once.
I just ran into this problem when moving a project to a new computer. ...
Getting started with F# [closed]
...uca Bolognese is still one of the best presentations on the subject). Then read the following two must-read books:
Programming F#: A comprehensive guide for writing simple code to solve complex problems by Chris Smith
Expert F# 2.0 (Expert's Voice in F#) by Don Syme, Adam Granicz, and Antonio Ci...
nodejs how to read keystrokes from stdin
...
In node >= v6.1.0:
const readline = require('readline');
readline.emitKeypressEvents(process.stdin);
process.stdin.setRawMode(true);
process.stdin.on('keypress', (str, key) => {
console.log(str)
console.log(key)
})
See https://github.com/n...
Split delimited strings in a column and insert as new rows [duplicate]
...
Here is another way of doing it..
df <- read.table(textConnection("1|a,b,c\n2|a,c\n3|b,d\n4|e,f"), header = F, sep = "|", stringsAsFactors = F)
df
## V1 V2
## 1 1 a,b,c
## 2 2 a,c
## 3 3 b,d
## 4 4 e,f
s <- strsplit(df$V2, split = ",")
data.fram...