drm lock

Java thread fair lock ReentrantLock (boolean fair), reentrantlock fair lockI. Fair lock 1. Why is there a fair lock? The CPU selects a thread randomly while waiting for the queue to schedule the thread. Because of this randomness, the thread cannot be guaranteed first-come-first-served (the lock controlled by synchroni

Lock (obj) lock the obj object Lock (this) locks the current instance object. If there are multiple class instances, the lock only locks the current class instance and has no effect on other class instances. Directly add the code. The main form code is as follows: Delegate void SetTextCallback (string text ); Public Fo

First, is the lock information part of the file? After a power failure is restarted, it will automatically disappear or will it never be lifted (because the lock-setting process no longer exists )? First, is the lock information part of the file? After a power failure is restarted, it will automatically disappear or will it never be lifted (because the

What is MDLMdl,meta data lock, a metadata lock, is generally called a dictionary lock. The dictionary lock corresponds to a data lock. Dictionary lock is to protect the data object is changed, usually some DDL will change the Dict

Initial understanding of MySQL Gap lockBeginning to know the gap of MySQL, think this design is unique, and other database practices are not the same, so tidy up a simple memo (although about the gap lock, the relevant information is many)1. What is GapTo put it bluntly, gap is the gap in the index tree where new records are inserted. The corresponding gap lock is added to the gap

HibernateREAD uncommitedREAD commitedRepeatable READSerializeable 2, MySQL pessimistic lock The pessimistic lock for MySQL is only executed when the SELECT * from table for UPDATE statement is executed.To use pessimistic locks, we must turn off the auto-commit property of the MySQL database, because MySQL uses the autocommit mode by default.That is, when you perform an update, MySQL commits the results imm

This article mainly introduced the PHP program in the file lock, mutual exclusion lock, read-write lock using skills analysis, which focuses on the Sync module and pthreads module use examples, the need for friends can refer to. We hope to help you. File lockFull name advisory file lock, which is mentioned in the book

Original: Lock-free data structure (LOCK-FREE data structures)One weeks ago, I wrote an article about the latch (latches) and spin lock (Spinlocks) in SQL Server. The 2 synchronization primitives (synchronization primitives) are used to protect shared data structures in SQL Server, such as pages in the cache pool (via a latch (latches)), and locks in the

Recently, Xiaojing gave skynet a pr. We have discussed this for a long time. It is said that it was because the message dispatching Department of skynet was rewritten to solve another problem, which can improve the CPU usage in some cases. Previously, skynet used the cas-based lock-free structure for message scheduling. However, in essence, the data structure of concurrent queues, whether it is Recently, Xiaojing gave skynet a pr. We have discussed th

Sync lock/Recursive lock/co-1 Sync lockLocks are often used to synchronize access to shared resources, create a lock object for each shared resource, call the Acquire () method to get the lock object when you need to access the resource (if another thread has already acquired the l