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How to design a multi-user ajax web application to be concurrently safe
...amount continuous CPU and I/O work done in each of these (you want lots of sleep/idle time)
backend scaling
Forget database and filesystem, you will need some sort of shared memory based backend for the frequent polling (if the client does not poll directly then each running server process will)...
Lock-free multi-threading is for real threading experts
...he it will run fast. A cache miss is really expensive, it puts the CPU to sleep for as many as 10 cycles if the data is not in the 1st cache, as many as 200 cycles if it isn't in the 2nd cache and it needs to be read from RAM.
Every CPU core has its own cache, they store their own "view" of RAM. ...
ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术
...格地说不是不可缺少的。毕竟，混合这两个为一个单独的函数是很容易的： zmq_send (s, "tcp://192.168.0.111:5555", data, sizeof (data), 0); 分离的理论基础即是技术的又是学术的。技术方面的争论包括： 当我们打算以异步的方式接...
Android Fragments. Retaining an AsyncTask during screen rotation or configuration change
...Cancelled())
return null;
SystemClock.sleep(500);
mProgress = i * 10;
publishProgress();
}
return null;
}
@Override
protected void onProgressUpdate(Void... unused)
{
...
How to modify a global variable within a function in bash?
...e while the _passback x is running.
You can see this yourself if you add a sleep 1; before printf or _passback.
_xcapture a d; echo then outputs x or a first, respectively.
The _passback x should not be part of _xcapture,
because this makes it difficult to reuse that recipe.
Also we have some unned...
Why are Subjects not recommended in .NET Reactive Extensions?
...So assume we have our own thread, we will probably have some sort of While/Sleep loop that we sit in to poll. When the check finds some messages we publish them. Well all of this sounds perfect for Observable.Create. Now we probably cant use a While loop as that wont allow us to ever return a Dispos...
通信连接组件 · App Inventor 2 中文网
...解码方法，便于图像文件的通信传输。此插件仅提供2个函数，使用非常方便，几乎没有学习成本。
属性
无
事件
无
方法
EncodeImage
DecodeImage
MqttClient 拓展
.aix 拓展及demo程序打包下载：
UrsAI2Paho.zip
MQTT是机器对机器(M...
Understanding garbage collection in .NET
...hen the freachable queue is empty (which is usually the case), this thread sleeps. But when entries appear, this thread wakes, removes each entry from the queue, and calls each object's Finalize method. The garbage collector compacts the reclaimable memory and the special runtime thread empties the ...
乐高机器人®组件 · App Inventor 2 中文网
... of a motor on the robot.
KeepAlive()
Keep Alive. Returns the current sleep time limit in milliseconds.
ListFiles(wildcard)
Returns a list containing the names of matching files found on the robot.
LsGetStatus(sensorPortLetter)
Returns the count of available bytes to read.
LsRead(s...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...derer 调用 onSurfaceCreated、onSurfaceChanged、onDrawFrame 调用本机函数。
查看此结构，我们可以看到创建一个将渲染位图并可以在 Mono 和 Stereo 中查看它们的应用程序非常简单。但是，如果您需要实现一些动态内容，例如位图上的标记...