Charles Duffy (Indeed.com) created IVY-1424:
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Summary: NIO FileLocker releases locks while still within
tryLock() call
Key: IVY-1424
URL: https://issues.apache.org/jira/browse/IVY-1424
Project: Ivy
Issue Type: Bug
Reporter: Charles Duffy (Indeed.com)
Attachments: ivy-nio-locker-fix.diff
The notes about NIOFileLocker being deprecated due to unreliability have an
obvious cause -- locks it grabs have already been released before the tryLock
method has even exited due to the finally block closing the file descriptor on
which the lock is held!
(flock() or fcntl()-based locks, into one of which categories those created by
NIO fall on modern Unixlike operating systems, are implicitly closed whenever
the file handle on which they're held exits. This is highly desirable behavior,
because it means that a lock is implicitly cleared on unclean shutdown of any
sort -- power failure, SIGKILL to the JVM, etc; this behavior is also perhaps
the primary reason to prefer NIO locks to the approach taken by
CreateFileLocker).
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