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A primer The theme of this section is based on single threading, which implements concurrency with only one main thread (apparently only one cpu available), so let's first review the nature of concurrency: toggle + save state The cpu is running a task that will be cut off to perform other tasks (switching is mandatory by the operating system) e ...

Background When current applications span multiple terminals, problems often arise as follows: The amount of information that each end needs to acquire is different. For example, because of the size of the display screen, the mobile terminal need ...

Solution and analysis of the problem that sem_timedwait has been blocked by modifying system time introduce When recently fixing a project problem, it was found that when the system time was modified forward, the sem_timedwait function would be blocked all the time. By searching, it is found that int sem_time dwait (sem_t*sem, con ...

[Wu Enda Machine Learning Assignment 2] - Logical Regression Chapter Python Implementation Recommended running environment: python 3.6 Establish a logistic regression model to predict whether a student will be admitted to a university or not. The a ...

Introduction to swagger Official introduction THE WORLD'S MOST POPULAR API TOOLING Swagger is the world's largest framework of API developer tools for the OpenAPI Specification(OAS), enabling development across the entire API lifecycle, from desi ...

brief introduction Concurrent HashMap is a thread-safe version of HashMap. It also uses the structure of array + linked list + red-black tree to store elements. Compared with HashTable with the same thread security, efficiency and other aspects have been greatly improved. A Brief Introduction to the Use of Locks Here is a brief introduction to ...

11.4 JavaScript 11.41 variable 1. Grammar of declaring variables // 1. Declare before define var name; // There is no need to specify a type or variable when declaring a variable. name Any type is acceptable name= "egon"; ​ // 2. Declarations are immediately defined var age = 18; 2. Variable Naming Specification 1. It's composed o ...

1. Creating linux System Account and Password through Location Variables$1 is the first parameter to execute the script, and $2 is the second parameter to execute the script. 1 #!/bin/bash 2 # Author: Peter zh 3 # Blog: https://home.cnblogs.com/zhangwduoduoj/ 4 # Time: 2019-08-17 19:19:45 5 # Name: userad.sh 6 # Version: v1.0 7 # Descr ...

3. JDK Concurrent Container Concurrent collection Concurrent HashMap: This is an efficient concurrent HashMap. You can understand it as a thread-safe HashMap. CopyOnWriteArrayList: This is a List, which is a family of ArrayLists by name. In the case of reading more and writing less, this List performs very well, far better than Vector. C ...

The leecode algorithm "155. Minimum Stack" is annotated and simple. Content of the original topic Design a stack that supports push, pop, top operations and can retrieve the smallest elements in a constant time. push(x) - Push element x i ...