Semaphore is a thread synchronization structure used to pass signals between threads to avoid signal loss, or to protect a key area like a lock. Since 5.0, jdk has been used in Java util. The official implementation of semaphore is provided in the concurrent package, so you don't need to implement semaphore yourself. However, it is necessary to ...
Posted by Stunt on Mon, 04 Apr 2022 00:30:22 +0300
Summary of lightning data reading process (FY4A)
The author didn't read the data in one step after he got the data in the cd4a, but he didn't explain it to his friends in one step. He never introduced the data in one step to his friends
1, Data source
From a netizen, let me try to read it. File name: FY4A-_LMI—_ N_REGX_1047E_L2-_LMIE_S ...
Posted by KC8Alen on Sun, 03 Apr 2022 16:59:29 +0300
Processes and threads
Today, the computers we use have already entered the era of multi CPU or multi-core, and the operating systems we use are operating systems that support "multi task", which enables us to run multiple programs at the same time, or decompose a program into several relatively independent subtasks, so that multiple ...
Posted by stenk on Sun, 03 Apr 2022 02:46:08 +0300
The title is no offense, but I think this advertisement is very interesting Take the mind map above if you like
Basic program structure
The well-known basic program structures are sequence, branch and loop.
The sequence will not be repeated. Next, we will explain the basic common writing and common patterns of branches ...
Posted by zeeshan_haider000 on Sun, 03 Apr 2022 01:24:27 +0300
In the previous series of articles on office automation, I have explained in detail several common libraries of Python operating Excel, such as openpyxl, xlrd/xlwt, xlwings, xlsxwriter, etc.
In order to further understand the similarities and differences of each library, so that it can be used flexibly in different scenarios, this paper will ...
Posted by k89mmmk on Sat, 02 Apr 2022 15:38:32 +0300
Brushing date: 8:50 pm Wednesday, March 17, 2021
The title is lecode, and the source is personal code collection
After much discussion and consultation, we now intend to work in the direction of Java
The main answer language is Java
Sword finger Offer 09 Queue with two stacks
The difficulty is simple. 195 collection shar ...
Posted by warnockm on Fri, 01 Apr 2022 03:05:16 +0300
Today, I want to share with you the specific playing methods of Service Mesh, a new generation of micro service architecture! Today, with the prevalence of micro service architecture, as an Internet technology practitioner, I believe everyone is familiar with the concept of micro service! As for the micro service framework like Spring Cloud, ...
Posted by davieboy on Thu, 31 Mar 2022 21:58:07 +0300
Sequence assignment is Python's default operation. If it is not used properly, it may fall into a syntax trap.
+It refers to splicing the elements of two sequences together. Generally, the sequences on both sides of the + sign are composed of the same type of data. During the splicing process, neither of the two operated sequences will be m ...
Posted by sarahk on Thu, 31 Mar 2022 18:01:47 +0300
3.1 basic concepts of object-oriented 3.2 class 3.3 membership method 3.4 object 3.5 object oriented features 3.6 interface 3.7 package
3.1 basic concepts of object-oriented
Object oriented is a programming method, or a programming specification. Its basic idea is to use the basic concepts of object, class ...
Posted by polarbear66 on Sun, 27 Mar 2022 21:48:17 +0300
File and directory operations
Get file or directory properties
File or directory operation
Obtain comprehensive examples of file or directory attributes and operations
Create a directory and its instances
Read directory and its instance
Delete a directory or file and its instances
Random access to files
Posted by George Botley on Sun, 27 Mar 2022 02:15:52 +0300