Package marauroa.server

Class RWLock

java.lang.Object
marauroa.server.RWLock
public class RWLock extends Object
This class is a Reader/Writters lock A Reader Writer Lock is a synchronization mechanism allowing access to data.
It allows multiple threads to read the data simultaneously, but only one thread at a time to update it.

Controlling concurrent access to a shared, mutable resource is a classic problem. Clients request, and later release, either read-only or read-write access to the resource. To preserve consistency but minimize waiting, one usually wishes to allow either any number of readers or a single writer, but not both, to have access at any one time.

While a thread is updating, no other thread can read the data. The name is misleading. It may cause you to think there are two locks; in reality there is a single lock that restricts both reading and writing.

  • Constructor Details

    • RWLock

      public RWLock()
      Constructor

  • Method Details

    • requestReadLock

      public void requestReadLock()
      Request a reader lock.
      Readers can obtain a lock as long as there is no writer.

    • requestWriteLock

      public void requestWriteLock()
      Request a Writers lock. A writer can obtain the lock as long as there are no more writers nor readers using the lock.

    • releaseLock

      public void releaseLock()
      This releases the lock for both readers and writers.