Detailed explanation of ReentrantReadWriteLock

Introduction:

All operations in ReentrantLock are mutually exclusive. In reality, there is a scenario where reading is very frequent, but writing is very little.In such a scenario, if the read and the read are not mutually exclusive, then the concurrency efficiency can be greatly improved, so the corresponding ReentrantLReadWriteLock appears.ReentrantReadWriteLock can do: read-read sharing, read-write mutual exclusion, and write-write mutual exclusion.

The implementation method is: two locks are encapsulated internally, one exclusive lock and one shared lock, between the threads that acquire the exclusive lockTo be synchronized; the threads between acquiring the exclusive lock and acquiring the shared lock are also synchronized; the threads acquiring the shared lock do not need to be synchronized.

Example of use:

public class ReentrantReadWriteLockDemo {private ReentrantReadWriteLock rwLock = new ReentrantReadWriteLock();private ReentrantReadWriteLock.ReadLock readLock = rwLock.readLock();private ReentrantRead