Table of Contents need: analyze: Some code implementation: 1. Operations implemented using only flag bits: 2. For greater security, the mutex lock code is added: 3. Use it with unique_lock to make the code safer Four: Use guard lock lock_guard to work with it 5. You can also use condition variables to process, which will […]
Tag: condition
Use the Stream stream to convert the obtained object List<Object>form data into Map<Grouping conditions, quantity statistics>form
For example, the current business needs to group the obtained data, and then use another method to process the data. The methods used are Collectors.groupingBy, Collectors.counting(), Collectors.reducing(). Then, take the following example as an example to collect the obtained lists and group the obtained data by gender, with gender as K and the number of […]
std::condition_variable condition variable and lock_guard, unique_lock
Used to block one thread, or block multiple threads at the same time, until another thread modifies the shared variable (condition) and notifies condition_variable. A thread that intentionally modifies a variable must Obtain std::mutex (often via std::lock_guard ) Modify while holding lock Perform notify_one or notify_all on std::condition_variable (no need to hold locks for notifications) […]
Use reflection to dynamically construct wrapper conditions (use reflection to obtain annotation values and entity class values)
Use reflection to dynamically construct wrapper conditions Entity class /** * api list query entity class * *@authorwys */ @Data public class SysApiQuery { private Long id; /** * api name */ @Query(type = QueryTypeEnum.EQUAL) private String apiName; /** * api path */ @Query(type = QueryTypeEnum.EQUAL) private String apiUrl; /** Starting time */ @JsonIgnore private […]
Azure DevOps YAML files have different output variables and conditions for different stages, jobs, and tasks.
Application of stage, job, task and condition in YAML Introduction Resource preparation structural relationship Code writing (task) Define variables within task task condition gets variable value task code explanation Test task code Code writing (job) job variable definition Get job variable value job condition job code explanation Test job code Code writing (stage) stage code […]
MySQL Lecture 8·How to perform mathematical calculations, string processing and conditional judgment?
Hello, I am safe and sound. Article directory How to perform mathematical calculations, string processing and conditional judgment? Math functions String functions conditional judgment function Summarize How to perform mathematical calculations, string processing and conditional judgment? MySQL provides many functions that are powerful and very convenient to use, including mathematical functions, string processing functions, and […]
Thread condition control realizes thread synchronization
I talked about mutex locks earlier, but I always feel that some functional mutex locks are not enough. Condition variables are another synchronization mechanism available for threads. Condition variables provide a place for multiple threads to meet. Condition variables, when used with mutexes, allow threads to wait for a specific condition to occur in a […]
Achieving kernel privilege escalation through conditional competition
Race Condition Vulnerability is a security issue that may cause incorrect behavior or data corruption when multiple threads or processes execute concurrently. This kind of vulnerability usually occurs when multiple threads or processes try to access and modify shared resources (such as memory, files, network connections, etc.). Due to the uncertain execution sequence or the […]
mybatis conditional constructor (enhanced version CURD)
Article directory 1.Wrapper introduction 2.QueryWrapper 3.UpdateWrapper 4.condition 5.LambdaQueryWrapper 6.LambdaUpdateWrapper 1.Wrapper introduction Wrapper: conditionally constructed abstract class, the top parent class AbstractWrapper : used to encapsulate query conditions and generate sql where conditions QueryWrapper : Query condition encapsulation UpdateWrapper : Update conditional packaging AbstractLambdaWrapper : Use Lambda syntax LambdaQueryWrapper : Query Wrapper for Lambda syntax use […]
Map matching of taxi trajectory data under offline OSM data conditions
Map matching of taxi trajectory data under offline OSM data conditions Preface: In the process of studying the road network matching of Python taxi GPS data (TransBigData + leuvenmapmatching) written by senior Xiaoxu of traffic data, I found that the osmnx library is difficult to obtain a complete road network of a city or a […]