lasso lock

TAGS: SQ negative LSE a high concurrent Har direct CAL schemeExamples of items to buy:① Gets the quantity of inventory from the database.② Check if the quantity of stock is sufficient.The quantity of ③ inventory minus the amount purchased by the buyer (in the case of each user buying one).④ final purchase completed.Just a few lines of logical code in the case of concurrency will be problematic, you can imagine.It is not tested here for the time being, and the following will give the test results

Examples of items to buy:① Gets the quantity of inventory from the database.② Check if the quantity of stock is sufficient.The quantity of ③ inventory minus the amount purchased by the buyer (in the case of each user buying one).④ final purchase completed.Just a few lines of logical code in the case of concurrency will be problematic, you can imagine.It is not tested here for the time being, and the following will give the test results for concurrent processing.To create a table:CREATE TABLE ' W

Examples of items to buy:① Gets the quantity of inventory from the database.② Check if the quantity of stock is sufficient.The quantity of ③ inventory minus the amount purchased by the buyer (in the case of each user buying one).④ final purchase completed.Just a few lines of logical code in the case of concurrency will be problematic, you can imagine.It is not tested here for the time being, and the following will give the test results for concurrent processing.To create a table:CREATE TABLE ' w

Lock (Locking)In the process of implementing business logic, it is often necessary to guarantee the exclusivity of data access. such as in the final settlement of the financial systemProcessing, we want to process the data for a cut-off point in time, and we don't want to be in the process of closing(may be a few seconds, or maybe a few hours), and the data will change again. At this point, we need to pass some machineSystem to ensure that this data i

Turn from: http://blog.csdn.net/javazejian/article/details/75043422 From "Zejian's blog." Related articles: Deep understanding of Java type information (class object) and reflection mechanism Deep understanding of Java Enum Types (enum) Deep understanding of Java Annotation Types (@Annotation) Deep understanding of the Java Class loader (ClassLoader) Deep understanding of the synchronized implementation principle of Java concurrency Java concurrent Programming-non-

Today, I saw the interesting question: what is the difference between locking and non-static methods on static methods, so that some understanding of the lock mechanism is introduced again.First look at the method:This is a very simple class that shares static variable num, and then a static and non-static method, all with a lockWe assume that there are two threads that operate both methods simultaneously, so can data be mutually exclusive?Java code

Llinxu Mandatory lock default is not open, want to let Linux support mandatory lock, not only when the mount is required to add-o mand, andThe files you want to lock are also required to set permissions.1. The proposed lock industry is called a cooperative lock, for this typ

As we all know, the disadvantage of multithreading is that the code will be the interference of concurrent access, the solution is the synchronization mechanism. The two common forms of synchronization are synchronous code blocks and synchronization functions, and both forms of locks are implicitly locked, and the former holds a lock that is the default. Starting with the JDK1.5, the lock is encapsulated by

Recently, because of the need in the work, learning the optimistic lock and pessimistic lock related knowledge, here I pass this article, I myself to these two "lock home" brother understanding record down; -Pessimistic lock: As its name implies, it refers to the conservative attitude of the data being modified by the

Pessimistic lock and optimistic lock are two common methods of resource concurrent lock design, and also a very basic concept in concurrent programming. In this paper, the two common locking mechanisms in the database data on the implementation of the system is introduced.Pessimistic lock (Pessimistic

Label: DDL statements only request table locks at the intent level. In the lock table statement, MySQL will request a MySQL level table lock, and InnoDB will also request a INNODB level table lock. The premise is Innodb_table_locks=1. https://www.percona.com/blog/2012/07/31/innodb-table-locks/ MySQL table level Locks and Innodb table levellocks is separate being

Lock as a tool for concurrent shared data, ensuring consistency, there are many implementations in the Java platform (such as synchronized and Reentrantlock, etc.). These locks have been written to provide convenience for our development, but the specific nature and type of the lock are rarely mentioned. This series of articles will analyze common lock names and