[Bug 1901] New: sun.awt.Win32FontManager.populateFontFileNameMap0() violates thread safety

[bugzilla-daemon at icedtea.classpath.org]

http://icedtea.classpath.org/bugzilla/show_bug.cgi?id=1901

            Bug ID: 1901
           Summary: sun.awt.Win32FontManager.populateFontFileNameMap0()
                    violates thread safety
           Product: IcedTea
           Version: unspecified
          Hardware: all
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P5
         Component: IcedTea
          Assignee: gnu.andrew at redhat.com
          Reporter: gitne at excite.co.jp
                CC: unassigned at icedtea.classpath.org

This is a followup to JDK-7131153.

sun.awt.Win32FontManager.populateFontFileNameMap0() in
jdk/src/windows/native/sun/font/fontpath.c violates thread safety. It calls
GetDC() and uses the returned DC handle to enumerate installed fonts. Calling
sun.awt.Win32FontManager.populateFontFileNameMap0() from multiple threads
simultaneously will lead to undefined results. Therefore, it should be
synchronized.

The MSDN documentation on GetDC()
(http://msdn.microsoft.com/en-us/library/dd144871%28v=vs.85%29.aspx) is pretty
clear about this:
Note that the handle to the DC can only be used by a single thread at any one
time.

Use of DC handles in other code locations may require additional review
regarding thread-safety.

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