On Wed, 2015-10-21 at 18:04 +0200, casper....@oracle.com wrote:
> It is only expensive within the process itself.
thread synchro would require additional barriers to maintain this state,
for a very unlikely case.
The atomic_{inc|dec}() on file refcount are already a problem.
We certainly do not use/take a lock to find a file pointer into file
descriptor table.
(This lock is only used at open() or close() time)
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