Alexey Kuznetsov updated IGNITE-637:
    Issue Type: Task  (was: Sub-task)
        Parent:     (was: IGNITE-641)

> Implement IgniteReentrantReadWriteLock data structure
> -----------------------------------------------------
>                 Key: IGNITE-637
>                 URL: https://issues.apache.org/jira/browse/IGNITE-637
>             Project: Ignite
>          Issue Type: Task
>          Components: data structures
>            Reporter: Dmitriy Setrakyan
>            Assignee: Alexey Kuznetsov
>            Priority: Major
> We need to add {{IgniteReentrantReadWriteLock}} data structure in addition to 
> other data structures provided by Ignite. {{IgniteReentrantReadWriteLock}} 
> should have similar API to 
> {{java.util.concurrent.locks.ReentrantReadWriteLock}} class in JDK.
> As an example, you can see how 
> [IgniteCountDownLatch|https://github.com/apache/incubator-ignite/blob/master/modules/core/src/main/java/org/apache/ignite/IgniteCountDownLatch.java]
>  is implemented in 
> [GridCacheCountDownLatchImpl|https://github.com/apache/incubator-ignite/blob/master/modules/core/src/main/java/org/apache/ignite/internal/processors/datastructures/GridCacheCountDownLatchImpl.java]
>  class.
> In general we need to have an entity in ATOMIC cache storing number of 
> readers and writers and allow user threads to block whenever needed to wait 
> for a lock.

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