unity lock

A recently maintained network server encountered performance problems, so it made major changes to the original program framework. Most of the changes are the thread working mode and data transmission mode. The final result is to change the lock usage mode. After some improvement, the GMB Nic can basically work at full speed. After the performance was up to standard, I was wondering if I could use a more lightweight

Mainly talk about the performance of the lock and some other theoretical knowledge, the main source of the content is "Java Concurrency in Practice", combined with their own understanding and practical application of the lock mechanism to a small summary.One of the first things to emphasize is that all locks (including built-in locks and advanced locks) are performance-intensive, that is, in high concurrenc

Mainly talk about the performance of the lock and some other theoretical knowledge, the main source of the content is "Java Concurrency in Practice", combined with their own understanding and practical application of the lock mechanism to a small summary.One of the first things to emphasize is that all locks (including built-in locks and advanced locks) are performance-intensive, that is, in high concurrenc

Reentrantlock Source Analysis 1--get unfair lock and fair lock () The most common way: View Code 1, for Reentrantlock need to master the following Reentrantlock creation (Fair lock/non-fair lock) Lock: Lock () Unlock: Unlock () Fi

Spin locks and mutex are two important concepts in concurrent programming. They are mainly used to lock shared resources to prevent Concurrent Data Access and ensure data consistency. But they also have some differences. This article mainly introduces these differences and describes when to use the spin lock and when to use the mutex lock. Theoretical Basis T

Why locks (concurrency control) are required. In a multiuser environment, multiple users may update the same record at the same time, which can create a conflict. This is the famous concurrency problem. Typical conflicts are:(1) Missing update: One transaction update overwrites the update result of other transactions, that is, the so-called update is lost. For example: User A changes the value from 6 to 2, and User B changes the value from 2 to 6, then user a loses his update. (2) Dirty read:

When InnoDB determines whether a row lock is in conflict, in addition to the most basic is/ix/s/x lock collision judgment, InnoDB also subdivides the lock into the following seed types: Record Lock (RK)Record locks, lock only one row of index records Gap

The lock mechanism is an important feature of a database that is different from the file system and an effective way to manage concurrent access. MySQL locks include table-level locks, page-level locks, and row-level locks. Table-level locks are the most granular locks in MySQL. They are easy to implement and consume less resources. They are supported by most MySQL engines. The most commonly used MYISAM and INNODB support table-level locks. The

[Guide: The basic theory of locks used in various large databases is consistent, but there are differences in the implementation. SQL Server emphasizes that the locks are managed by the system. When the user has a SQL request, the system analyzes the request, automatically in satisfying the lock condition and the system performance for the database with the appropriate lock, while the systems are often auto

I. The background of the spin lock proposedBecause some resources in a multiprocessor system environment are limited and sometimes require mutually exclusive access (mutual exclusion), a lock mechanism is introduced, and only the process that acquires the lock can obtain access to the resource. that is, only one process can acquire a

A recently maintained network server encountered performance problems, so it made major changes to the original program framework. Most of the changes are the thread working mode and data transmission mode. The final result is to change the lock usage mode. After some improvement, we can basically achieve GMB Network Adapter working at full speed. In After the performance was up to standard, I was wondering if I could use a more lightweight

, following the user gaze. Custom notifications are also provided in the form of tracking lost images (tracking loss image). In order to improve the user experience of a tracking-dependent app, it is necessary for unity to deal with things thoroughly before tracking the recovery.custom tracking lost images. when tracking is lost, developers can provide a custom image for display. For custom tracking lost images, open the Edit > Project Settings ... >

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