In a multi-threading application multiple reads can occur simultaneously for a shared resource. It is only when multiple writes happen simultaneously or INTERMIX of read and write that there is a chance of writing the wrong value or reading the wrong value.

ReadWriteLock USES the same idea in order to BOOST the performance by having separate PAIR of locks. A ReadWriteLock maintains a pair of associated locks -

• One for read-only OPERATIONS;
  and
• One for writing.

The read lock may be held simultaneously by multiple reader threads, so long as there are no writers. The write lock is exclusive.

In a multi-threading application multiple reads can occur simultaneously for a shared resource. It is only when multiple writes happen simultaneously or intermix of read and write that there is a chance of writing the wrong value or reading the wrong value.

ReadWriteLock uses the same idea in order to boost the performance by having separate pair of locks. A ReadWriteLock maintains a pair of associated locks -

The read lock may be held simultaneously by multiple reader threads, so long as there are no writers. The write lock is exclusive.