how to destroy lock

I. Why should I introduce locks?When multiple users perform concurrent operations on the database, the following data inconsistency occurs:Update lossA and B read and modify the same data. The modification result of one user destroys the

Zookeeper is a distributed, open-source distributed Application coordination Service. Based on zookeeper, we can implement a simple distributed mutex, which includes reentrant and non-reentrant. The code is as follows: Import

Table of Contents 1 UNIX network programming-lock (2) 1.1 semaphores API 1.2 Implementation of semaphores mutex lock 1.2.1 The member variables are as follows: 1.2.2 implement the following member functions: 1.3

One, what is file lockFor the word lock, we must not be unfamiliar, because we live in a large number of locks, they play its role in all aspects of the world, now the function of the lock can be summed up as a sentence, is to prevent some people do

First, overview:Spin lock is a kind of low-level synchronization mechanism in SMP architecture.When thread A wants to acquire a spin lock and the lock is held by another thread lock, thread a spins in a loop to detect if the lock is already

Before talking about the lock mechanism of SQL Server, consider the following scenario: When you are riding your car to your destination in the heat of the summer, is it depressing to meet a few long red lights on the road? Sometimes you just can't

Learn the 11th chapter of apue3rd, the main talk is multithreaded programming. Because multithreading shares the resources of a process such as heaps and global variables, multithreaded programming is most important for thread synchronization using

"Why do you want to lock?" A database is a shared resource that is used by a multi-user, such as a user table T_user, two people in front of the browser login to the same account, the phone number changed. When multiple users have concurrent access

The android:configchanges= "Orientation|keyboardhidden" attribute is first added to the activity element of the Mainifest.xmlAdding this property means that the application will handle changes in screen orientation and keyboard state (rolled or

Read/write Lock (Read-write lock)A reviewIn some programs there are reader-writer problems, that is, access to some resources there are two possible situations, one is that access must be exclusive line, that is, the meaning of exclusivity, which is