Code review request: 7082769: FileInputStream/FileOutputStream/RandomAccessFile allow file descriptor be closed when still in use

[Alan Bateman]

Seán Coffey wrote:
> http://bugs.sun.com/view_bug.do?bug_id=7082769
>
> webrev : http://cr.openjdk.java.net/~coffeys/webrev.7082769.7087019.jdk8/
>
> Bug fix where we ensure that the fd object is not disposed of until 
> all streams are closed out.
>
> Testcase is a bulked up version of CR 6322678 (which wasn't committed  
> at time of 6322678 fix). It includes create/close() calls for 
> FileInputStream/FileOutputStream/RandomAccessFile which all reference 
> the same file descriptor. Multi threaded access to the same file 
> descriptor is also tested.
>
> Typo fix also as per http://bugs.sun.com/view_bug.do?bug_id=7087019 
> also included.
>
I think the change are okay. There are other issues with sharing file 
descriptors between streams but your changes are a good improvement and 
eliminate the messy runningFinalizer code (which I think someone added 
to address a regression from a previous fix to an address another issue 
with sharing file descriptors).

The coverage in the new test looks good but I think the code could be a 
bit cleaner. For example in TestFinalizer then it uses 
try-with-resources at L64 but not at L55. It uses /**/ style comments at 
L63 but // style at L76. Temporary file usage is also inconsistent, 
Test_ is created in the system temporary directory, Test6322678 in the 
working directory. Also the temporary file name is duplicated at L97. I 
think TestMultipleFD would be a lot cleaner with try-with-resources too. 
I also suspect the deletes at L138 and L156 may be failing on Windows. 
If you have time to do a bit of clean-up in the test then I think you 
are good to go.

-Alan.