read lock

I. Introduction to read and write locksIn reality there is a scenario where read and write operations are done on shared resources, and write operations are not as frequent as read operations. There is no problem with multiple threads reading a

Thread locks are like synchronized techniques in a traditional threading model, but are more object-oriented than sychronized, and the lock itself should be an object, similar to a lock in life. Code snippets executed by two threads if you want to

Rwmutex: is a mutex-based read-write mutex, a goroutine can hold multiple read locks or a write lock, at the same time can only hold read lock or write lock Data structure Design: Type Rwmutex struct { w mutex //Mutex Writersem

Reprint Please specify source: http://www.cnblogs.com/skywang12345/p/3505809.htmlReadwritelock and Reentrantreadwritelock introductionReadwritelock, as the name implies, is a read-write lock. It maintains a pair of related locks--"read lock" and

This is a creation in Article, where the information may have evolved or changed. Golang mutexes and read-write locks The Golang Sync package implements two types of lock mutexes (mutexes) and Rwmutex (read and write locks), where Rwmutex is

MySQL database, the concept of the table is to the user? User A locks a table and User B is affected by the lock, is that it? If it is, in a site station, the operation database is the same user, this time the lock still works? If not, how should

Original source: MySQL 5.5 Reference ManualPart of the translation: "mysql_5.1 Chinese reference Manual"Reprint please specify the original link http://www.cnblogs.com/lenagt/archive/2012/06/06/2538201.html Thank you.---------------------------------

1.1.1.three write lock downgrade for read-write lock applicationReentrantreadwritelock also features write-lock demotion, which has some relationship to reentrant sex. (1) you can downgrade to read lock when holding a write lock. (2) You cannot

Read/write locks on WindowsThis section briefly introduces the read/write locks and their implementations on Windows. BackgroundWindows does not provide the read/write lock API after Vista and Server2008, that is, the SRW series functions

Graphic ReentrantreadwritelockIf you have previously used a read-write lock, you can read this article directly. If it has not been used before, then please cooperate with my other article to see: [Source Analysis] read-write lock

System LockShow processlistStatus entries in Show Processlist output: 5.1 None of the manuals, or the translation of the problem, are accompanied by 5.5 original description:After createThis occurs when the thread creates a table (including internal

What is the concept of a mysql database and a table for users? If user A locks A table, user B will be affected by the lock, right? If yes, in a website, all operations on the database are performed by the same user, will the lock still work at this

This is a creation in Article, where the information may have evolved or changed. Source-level anatomy of the Sync.rwmutex in the Go standard library. Overview Rwmutex, read-write lock, also known as "read-write mutex."A read-write lock is simply a

MySQL lock table _lock TABLES_unlock TABLES mysql5.6 Reference Document: Http://dev.mysql.com/doc/refman/5.6/en/lock-tables.html The basic syntax of the lock table and the lock tableLOCK TABLES tbl_name [[as] alias] lock_type [, Tbl_name [[as] alias]

The following example shows the built-in reentrantreadwritelock instance in the Java API concurrent library.Class cacheddata {object data; volatile Boolean cachevalid; reentrantreadwritelock RWL = new reentrantreadwritelock (); void

The MyISAM storage engine only supports table locks, which is the only supported lock type in MySQL versions. With the increasing requirements of applications on transaction integrity and concurrency, MySQL began to develop a transaction-based

Mysql lock mechanism bitsCN.com is okay today. let's take a look at the advantages and disadvantages of the three mysql lock mechanisms: MySQL storage engines use three types of locking mechanisms: Row-level locking, page-level locking, and

Simply cache the system: when the thread is fetching data, if that data exists in my memory, I return the data, and if it doesn't exist in my cache system, then go to the database and return the data and save it in my cache.This involves reading and

Three methods for mysql backup: bitsCN.com I. purpose of backup Disaster Recovery: recover and restore damaged dataDemand Change: data needs to be restored to a time before the change due to demand changesTest: test whether the new function is

I. Purpose of backup Disaster recovery: recover and restore damaged dataDemand change: data needs to be restored to a time before the change due to demand changesTest: test whether the new function is available Ii. Backup considerations How long