A semaphore is essentially a counter used to coordinate the reading / writing of shared data objects by multiple processes (including but not limited to parent-child processes).
It is not for the purpose of transmitting data. It is mainly used to protect shared resources (shared memory, message queue, socket connection pool, ...
Posted by amob005 on Fri, 15 Apr 2022 15:34:10 +0300
Detailed explanation of Java methods
What is the method?
A Java method is a collection of statements that together perform a function.
Method is an ordered combination of steps to solve a class of problemsMethod is contained in a class or objectMethods are created in the program and referenced elsewhere
Java object oriented
Edited on: February 28, 2021
Read this section: it takes about 30 minutes, a total of 3099 words
1. Process oriented and object-oriented
Pop (procedure oriented programming) and OOP (object oriented programming) Object oriented is relative to process oriented. Process oriented, which emphasizes the functional behavior. ...
Posted by jaiswal on Thu, 14 Apr 2022 09:32:20 +0300
Two modules commonly used in Python 3 threads are:
_ thread (obsolete)Threading (recommended)
Python 3 uses two standard libraries_ thread and threading provide support for threads.
_ thread provides low-level, original threads and a simple lock. Compared with threading module, its function is still relatively limited. ...
Posted by sharmeen on Sun, 10 Apr 2022 23:01:43 +0300
The Swagger library provided by SpringFox has been used in the SpringBoot project before. After going up and down the official website, I found that there has been no new version for nearly two years! SpringBoot 2.6 was upgraded a few days ago In version x, it is found that the compatibility of this library is getting worse and worse. Some comm ...
Posted by sam_rich on Fri, 08 Apr 2022 16:19:40 +0300
File and exception
In the actual development, it is often encountered to modify the data Persistence The most direct and simple way to realize data persistence is to save the data to a file. When it comes to the word "document", you may need to popularize science about it first file system But we don't waste any time here to introduc ...
Posted by gwood_25 on Wed, 06 Apr 2022 06:37:37 +0300
Introduction: process oriented C language is a relatively low-level high-level language, and C + +, c#, Java and Python are all object-oriented high-level languages, but C language is firmly at the top of the list of programming languages, which shows that C is widely used and powerful, as small as "Hello, wood!", Lighting the LED of ...
Posted by Twentyoneth on Wed, 06 Apr 2022 00:08:37 +0300
Java self study-6
Static versus Non-Static
In this blog, I would like to compare the differences between Static methods and Non-Static methods.
If you want to invoke Static methods, using class name. In other words, Static methods is a static value (it seems to be nonsense, but it's not). In other words, it can only perform a ...
->Gitee source code click here<- Structure description: ① There are three parts in a node a.prev pointer: the pointer of the previous node b.data: store valid values c.next pointer: the pointer to the next node ② The linked list has a head node, which does not store valid values, but stores the pointer of the head node and the pointer of ...
Posted by Thunderfunk on Tue, 05 Apr 2022 04:51:06 +0300
I am the sigh of the sea, the tears of the sky and the smile of the field. This is so cool with love: it is the sigh of the emotional sea, the tears of the ideological sky, and the smile of the spiritual field.
China's traditional culture has a long history and has given birth to many strange techniques. In novels and various fi ...
Posted by bubblenut on Mon, 04 Apr 2022 04:16:04 +0300