ledger locks

What Is A reentrant lock? The literal meaning of "re-entry" is already obvious, that is, you can re-enter. Reentrant locks, that is, a thread is After obtaining a lock, you can continue to obtain the lock, that isAllows a thread to obtain the same lock multiple times.. For example, synchronized built-in locks can be reentrant. If Class A has two synchornized Methods: Method1 and method2, calling Method1 is

SMP systems, enabling the protection of critical areas in multi-processor cases. So in the SMP system, the implementation of the spin lock is intact.however, for up systems, spin locks can be said to be an SMP version of the castrated edition. Because only the spin lock in an SMP system requires a true "spin". purpose of Spin lockThe spin lock is implemented to protect a short critical section operation code, ensuring that the operation of the critic

find that the basic task is based on the thread pool, of course, you can also manually create a task set, and then wait for all the tasks to end to achieve the same function. The Parallel.For and Parallel.forach methods above do not assume that you can find all the for and foreach methods in your code and replace them, because each task assigns a delegate, and the online Cheng Chili executes, and if the task in the delegate is thread unsafe, you may also need to To lock to ensure thread safety,

Because of the project, so today we talk about the two ways of implementing distributed locks. A kind of implementation using database lock, a single thread mechanism using Redis. Two ways can be implemented simultaneously in a project. The way in which configuration file control is used facilitates switching to another way when an exception occurs. Distributed lock use scenario: the so-called distributed lock, is a distributed system or the use of th

rows and so on before the operation, first to the system to request to lock, said the popular point is the operation before the declaration of permissions.Blocked cycle (link): Apply for lock, get lock permission, release lock permissionThere are two basic types of closures: Exclusive locks (Exclusive locks,x locks) and shared

SerializableSerializable is the highest transaction isolation level, with the highest cost and low performance, which is rarely used at this level, where the transaction sequence executes not only to avoid dirty reads, non-repeatable reads, but also to avoid Phantom reads.Additional reference Links: MySQL database transaction isolation levels (Transaction isolation level)Lock (means of concurrency control)Exclusive locks (exclusive

In the previous article I discussed the latch in SQL Server. At the end of the article I gave you a brief introduction to the next spin lock (Spinlock). Based on that foundation, today I'll continue to discuss spin locks in SQL Server and show you how to troubleshoot them.Why do we need a spin lock? as I have pointed out in the previous article, it is meaningless to place a latch on each shared data structure by using a latch to synchronize access bet

The following is a summary of Oracle locking policies:· Oracle only adds row-level locks to data when it is modified. Under normal circumstances, it will not be upgraded to block-level locks or table-level locks.· Oracle will never lock data if it only reads data. It will not be locked on the Data row because of simple read operations.· Writer does not block the