read lock

The last tool in the lock is introduced from this section: read-write Lock (Readwritelock).Reentrantlock implements a standard mutex, which is the notion that only one thread can hold a lock at a time, or the so-called exclusive lock. This feature

A lock is a mechanism by which a computer coordinates multiple processes or a purely thread concurrently accessing a resource. in a database, data is a resource that is shared by many users in addition to the contention of traditional computing

The essence of a backup is to save a copy of the dataset, but the original data is constantly changing, so the backup can only revert to the data before the data changes. What about the changes? So it's important to develop a good backup strategy.I.

Re-entry Lock Reentrantlockcan replace synchronized, but synchronized is more flexible.However, you must have to manually release the lock.try { lock.lockfinally { lock.unlock();}A re-entry lock means that any thread can acquire the lock again

The last tool in the lock is introduced from this section: read-write Lock (Readwritelock).Reentrantlock implements a standard mutex, which is the notion that only one thread can hold a lock at a time, or the so-called exclusive lock. This feature

NO1:Lock interfaceNew Reentrantlock (); Lock.lock (); Try {}finally{ lock.unlock ();}No2:Do not say the process of acquiring a lock is written in a try block, because if an exception occurs while acquiring the lock (the implementation of the

(1) Fcntl function description The previous 5 basic functions enable the opening of the file, read and write basic operations, this section will discuss how the file has been shared in the case of how to operate, that is, when more than

Overview compared to other databases, MySQL's locking mechanism is relatively simple, and its most notable feature is that different storage engines support different locking mechanisms. MySQL can be broadly categorized into the following 3 types of

About Explicit LockingEhcache contains an implementation which provides for explicit locking, using read and write locks.With explicit locking, it's possible to get more control over Ehcache ' s locking behavior Apply an atomic change with

An introductionIn a multi-threaded environment, the same data read and write, will involve thread security issues. For example, when one thread reads the data, another thread writes the data, causing inconsistencies in the data before and after the

Read/write lock Index: Initialize a read/write lock pthread_rwlock_init Read lock pthread_rwlock_rdlock Non-blocking read lock pthread_rwlock_tryrdlock Write lock read/write lock pthread_rwlock_wrlock Non-blocking write lock

A frequent requirement of thread security is to allow concurrent reading but not concurrent writing. For example, this is true for files. ReaderwriterlockslimIn. NET Framework 3.5It is provided to replace the previous"Fat"Version"Readerwriterlock"

A lock is a mechanism by a computer to coordinate multiple processes or threads to concurrently access a certain resource. In databases, in addition to traditional computing resources (such as CPU, ram, and I/O), data is also a resource shared by

FcntlFunction Description: Manipulate the attributes of the file according to the file description.#include #include int fcntl (int fd, int cmd);int fcntl (int fd, int cmd, long arg);int fcntl (int fd, int cmd, struct flock

Linux Advanced Programming Fundamentals Series: Inter-thread communicationReprint: Original Address http://blog.163.com/jimking_2010/blog/static/1716015352013102510748824/Inter-thread communication mechanism:Threading is a lightweight process. the

I. Purpose of the backupDisaster recovery: Recovering and restoring corrupted dataChange in demand: the need to restore data to change before it changesTest: Test whether new features are availableIi. issues to be considered in backupCan tolerate

Notes Summary This article introduces the thread lock technology in JAVA5: Lock and condition, realizes the communication between threads, in which the use of read lock and write lock is demonstrated by a caching system, and the application of

1,--single-transactionInnoDB table when backing up, the option --single-transaction is usually enabled to guarantee the consistency of the backup , in fact it works by setting the isolation level for this session to: repeatable READ To ensure that

 Objective A lock is a mechanism by which a computer coordinates multiple processes or threads concurrently accessing a resource, and in a database, data is a resource that is shared by many users in addition to contention for traditional

Auth:jindate:20140506The main reference to organize informationMySQL performance tuning and architecture design-seventh MySQL locking mechanismHttp://www.cnblogs.com/ggjucheng/archive/2012/11/14/2770445.htmlUnderstanding mysql--Architecture and