Programmer Think

What is Event Cycle As we all know, JavaScript is single-threaded, and Nodejs can implement non-blocking I/O operations, because Event Loop exists. Event Loop has the following stages, a rectangle represents a stage, as follows: ┌───────────────────────┐ ┌─>│ timers │ │ └──────────┬────────────┘ │ ┌──────────┴──────────── ...

Original: www.bluefoxah.org/teamtalk/server_flow.html Preface In the previous article, we simply analyzed the configuration of each server. In this article, we simply analyzed the whole operation process of TeamTalk server. Server-side process There is no strict sequential process for the start-up of the server, because each end ...

Preface: Inter-process Communication (IPC) refers to the communication between processes. Generally speaking, an app has only one process, but may have multiple threads, so we use multithreaded communication, such as handler,AsyncTask. But in some special cases, we need multiple processes in our app, or we need to communicate across processes w ...

We learn advanced process communication, which means that users can efficiently transmit large amounts of data using a set of communication commands provided by the operating system. Several main means of interprocess communication: pipeline, message queue, shared memory, socket The Conduit Pipeline, a shared file used to connect a read p ...

socket.io provides event-based real-time two-way communication Connection between server and client socket.io also provides API s for both the server and the client Server socket.io must bind an instance of http.Server Binding http.Server Implicit binding Implicit binding is done by calling listen or attach functions when an incoming port is in ...

Bluetooth is one of the most popular methods of data transmission for smart devices. It connects with smart devices through mobile app s to obtain measurement data on devices. We can see it everywhere in our life, such as Bluetooth smart bracelet, Bluetooth electronic scales, Bluetooth ECG measurement equipment and so on. In this article, ...

A Bluetooth module looks small, but it's still a bit complicated. I found a sample code from the Internet, http://blog.csdn.net/vnanyesheshou/article/details/51554852, but it can't be used directly. It needs to be read, understood and modified by myself before it can be used. First paste a homemade uml map: It is not difficult to see from t ...

Simple differences between Java standard IO and Java NIO indicate:   Java Standard IO Java NIO API calls simple complex Low-level implementation Stream-oriented, one-way channel Oriented, Release CPU, Memory Pressure Results Synchronized blocking Synchronized non-blocking Data Peep Bloc ...

Catalog @ 1. The server supports only one client connection Server-side program (server.py): import socket # Create a server-side socket object server = socket.socket() # Bind IP (ipocnfig command looks at IP address) and port (custom network port can be used without conflicting with an existing system port) server.bin ...

We talked about deploying a simple Python program before. In this section, we will extend the Python program, connect redis database, and do some operations on redis. New App.py, as follows: from flask import Flask from redis import Redis import os import socket app = Flask(__name__) redis = Redis(host=os.environ.get('REDIS_HOST', '12 ...