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实现一个简单的服务端推方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...：实际应用时，应该加上权限判断逻辑，比如只有限定的IP地址才能使用此功能。
当数据库有新数据的时候，可以通过触发器来写Nginx共享内存，当然，在应用层通过观察者模式来写Nginx共享内存通常会是一个更优雅的选择。
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Test if remote TCP port is open from a shell script
...ing if a given TCP port is open on a remote server, from inside a Shell script.
16 Answers
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ConnectionTimeout versus SocketTimeout
... answer. This means that the server has been shut down, you used the wrong IP/DNS name, wrong port or the network connection to the server is down.
A socket timeout is dedicated to monitor the continuous incoming data flow. If the data flow is interrupted for the specified timeout the connection is...
Pseudo-terminal will not be allocated because stdin is not a terminal
...ize the content of $1 at all.
– Cristian Matthias Ambæk
Aug 26 '16 at 9:33
1
@mklement0 Sure, yo...
Multiprocessing: How to use Pool.map on a function defined in a class?
...or p in proc]
return [p.recv() for (p, c) in pipe]
if __name__ == '__main__':
print parmap(lambda x: x**x, range(1, 5))
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ZeroMQ实例-使用ZMQ(ZeroMQ)进行局域网内网络通信 - C/C++ - 清泛网 - 专注C/C++及内核技术
...ck = NULL;
//使用tcp协议进行通信，需要连接的目标机器IP地址为192.168.1.2
//通信使用的网络端口 为7766
const char * pAddr = "tcp://192.168.1.2:7766";
//创建context
if((pCtx = zmq_ctx_new()) == NULL)
{
return 0;
}
//...
Defeating a Poker Bot
...
classify rogue cheating or robotic
players.
Back when online poker was a fairly
new entity, there was rumour and talk with limited evidence that
some poker client software
screen-shots of suspicious players
desktops to see if they were running
programs that assist them. However (even if this were ...
Is “double hashing” a password less secure than just hashing it once?
...g users depends on your system.
You can probably let users wait an extra ¾ second or so during authentication. Profile your target platform, and use as many iterations as you can afford. Platforms I've tested (one user on a mobile device, or many users on a server platform) can comfortably suppor...
What algorithms compute directions from point A to point B on a map?
...tion, you can have several layers of map data: A 'highways' layer that contains only highways, a 'secondary' layer that contains only secondary streets, and so forth. Then, you explore only smaller sections of the more detailed layers, expanding as necessary. Obviously this description leaves out a ...
SSH to Elastic Beanstalk instance
... access. The below will lock it down to only allow ingress from a specific IP address.
SSH | tcp | 22 | 22 | 192.168.1.1/32
Configure the environment of your Elastic Beanstalk Application
If you haven't made a key pair yet, make one by clicking Key Pairs below Security Group in the ec2 tab.
In...