[PATCH] 8153925: WindowsWatchService hangs on GetOverlappedResult and locks directory

[Alex Kashchenko]

Hi,

Please review a fix for the windows-specific WatchService problem:

  - issue: https://bugs.openjdk.java.net/browse/JDK-8153925
  - patch: http://cr.openjdk.java.net/~akasko/jdk8u/8153925/webrev.00/
  - reproducer: 
http://cr.openjdk.java.net/~akasko/jdk8u/8153925/reproducer.00/GetOverlappedResultHangsTest.java
  - original JBoss Tools issue: https://issues.jboss.org/browse/JBIDE-22078

The patch adds an additional flag to WindowsWatchKey that is set to true 
when ReadDirectoryChangesW call fails. If the flag is set then 
GetOverlappedResult won't be called after CancelIo call during key 
invalidation.

-- 
-Alex