semaphore meaning

POSIX semaphores are real-time extensions that are part of the POSIX standard system interface definition. The XSI IPC defined in the SUS (Single UNIX specification) specification also defines the system interface that people commonly refer to as

Introduction In the previous article, the Reentrantlock principle based on Aqs was analyzed in detail, and Reentrantlock represented an exclusive lock through the transformation between the state variables 0 and 1 in Aqs. So can you think about what

"Semaphores are used in multi-threaded multitasking, where one thread completes an action by telling another thread about the semaphore, and the other thread is doing some action (where everyone is blocking when they are semtake). The mutex is used

Introduction In the previous article, the Reentrantlock principle based on Aqs was analyzed in detail, and Reentrantlock represented an exclusive lock through the transformation between the state variables 0 and 1 in Aqs. So can you think about what

IntroductionIn the previous article, the Reentrantlock principle based on Aqs was analyzed in detail, and Reentrantlock represented an exclusive lock through the transformation between the state variables 0 and 1 in Aqs. So can you think about what

"The semaphore is synchronized with multi-threaded multitasking, and one thread completes an action by telling the other thread that the other thread is going to do some action (where everyone is blocking when they are semtake)." The mutex is used

This article will describe the mechanism of a communication between processes-the semaphore. Note: Please do not confuse it with the previously mentioned signal, the signal and the semaphore are different two kinds of things. For more information

In many cases, there may be multiple threads that require access to a small number of resources. It is assumed that several threads are running on the server that answer client requests. These threads need to connect to the same database, but at any

A mutex is a key that a person takes to enter a room and gives the key to the first one in the queue when it comes out. The general usage is to serialize access to the critical section code to ensure that the code is not run in parallel.Semaphore is

ObjectiveIn a multithreaded environment, the JDK provides developers with a number of components for user use (mainly under java.util.concurrent), so that users do not need to be concerned about how to write code that takes into account both thread