drm lock

Preface In fact, the title is more appropriate to use a mutex mechanism, the main two problems in concurrency is: how the thread synchronization and how the thread communicates. Synchronization is mainly through mutual exclusion mechanism to ensure that the mutual exclusion mechanism we are most familiar with the lock, of course, there is no lock of CAS implementation. Multi-threaded shared resources, suc

Description: 1, personal technology is not a drop, also did not write threads in the project, the following are all based on their own understanding of the written. Therefore, only for reference and hope to point out the different views. 2, actually want to put the code of GitHub posted out, but still recommended in the beginner you write more personally, it is not posted out.I. BASIC INSTRUCTIONSClass, Object: ... (Don't know what to say, imaginative achievement here inexpressible >. Class lock

Http://www.infoq.com/cn/articles/java-memory-model-5 deep understanding of the Java Memory Model (v)--lock Http://www.ibm.com/developerworks/cn/java/j-jtp10264/Java Theory and Practice: a more flexible and scalable locking mechanism in JDK 5.0 http://blog.csdn.net/ghsau/article/details/7481142 1, Synchronized Declaring a block of code as synchronized has two important consequences, usually the code has atomicity (atomicity) and visibility (visibilit

The previous article introduces the lock that protects memory structure or variable in MySQL source code, and here we begin to introduce the table lock in MySQL transaction.Note 1: On the implementation of the table lock, the structure of "mutex+condition+queue" is used to implement the table lock function of concurren

Tags: read-only and tle sele generation process external HTTPS openNote: This article is reproduced from http://www.hollischuang.com/archives/934As described in the lock mechanism of a database, the task of concurrency control in a database management system (DBMS) is to ensure that the same data in the database is accessed simultaneously without disrupting the isolation and uniformity of the transaction and the consistency of the database.Optimistic

The most common way: int a =; Note: In general, this will be set to a class variable, such as the Zhi in Segement and the global lock in copyonwritearraylist final reentrantlock lock = new Reentrantlock () ; Lock.lock ()//Get lock try { a++;//business logic } catch (Exception e) { }final

With the frontline synchronization only know the Synchronize keyword, then know that there is a lock, why also have a lock to achieve synchronization? Synchronized's limitations occupy the lock thread waiting for IO or other reasons to be blocked, without releasing the lock, Read and read can also conflict when other t

In the database lock mechanism, the task of concurrency control in a database management system (DBMS) is to ensure that multiple transactions simultaneously access the same data in the database without disrupting the isolation and uniformity of the transaction and the consistency of the database. Optimistic concurrency control (optimistic lock) and pessimistic concurrency control (pessimistic

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 has been emphasized in the previous chapters. Obviously this feature red

In Java multithreading, you can use the keyword synchronized to implement a mutex between threads. After JDK1.5, a thread concurrency library java.util.concurrent is provided to manipulate multiple threads, including java.util.concurrent.atomic and Java.util.concurrent.lock. Atomic can realize the atomic operation of data or variable, and lock can achieve thread mutual exclusion, can realize read-write lock