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

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

Lightweight read-write lock (Slim reader-writer locks): Read-write lock is actually a special spin lock, it divides the audience of the shared resources into readers and writer, readers only read access to the shared resources, the writer needs to write to the shared resources.This lock improves concurrency relative to

distributed Lock implementation method A distributed lock based on zookeeper One. Why do I use distributed locks?When the number of application servers exceeds 1, access to the same data can cause access violations (especially write conflicts). Simply using relational databases, such as MySQL, can be implemented with transactions to implement locks, and optimistic locks can be implemented using version num

Body ContentSimulation preparation-How to simulate high concurrent access to a script: Apache installation file Bin/ab.exe can simulate concurrency-C simulates how many concurrent-N requests have been requested for a total of/HTTP scriptsC:\phpstudy\apache\bin>ab.exe-c 10-n http://localhost/try.phpThe lock in MySQL:Grammar:LOCK Table table Name 1 read| WRITE, table name 2 read| WRITE ... "Lock-up table" ...