Request for review: 7197627: There are issues with shared data on windows

[harold seigel]

Hi,

Please review the following change to fix bug 7197627.

Summary:
The original fix for this bug created the CDS classes.jsa file with 
read/write protection.  This change creates the file with read-only 
protection and only changes the file/s protection to read/write when 
deleting the file.  This is a safer implementation.

This was tested on Windows 7 and Windows XP and sanity tested on Linux.

Open webrev at http://cr.openjdk.java.net/~hseigel/bug_7197672/ 
<http://cr.openjdk.java.net/%7Ehseigel/bug_7197672/>

Bug link at http://bugs.sun.com/view_bug.do?bug_id=7197672

Thanks!  Harold