Webrev : http://cr.openjdk.java.net/~prr/8184135/
Long ago JDK worked best on certain Solaris SPARC framebuffers by using
Solaris DGA.
This relied on a native library (libsunwdga) compiled from JDK sources
together with
some imported framebuffer-specific proprietary binary libraries
pre-compiled for SPARC v8 & v9.
All of the "isDgaAvailable" and DGA locking code in the open sources are
there only to support that.
However Oracle JDK9 has a silly state of affairs where it copies the
framebuffer-specific proprietary binary libraries
into the build but no longer builds the libsunwdga needed to work with
them because JDK 9 does not support
Solaris 10 .. the latest Solaris version which still supports these
framebuffers on what is now mostly obsolete
and unsupported hardware anyway.
So it makes sense to stop copying those libraries (not an openjdk
problem) but also to remove the
dead code that no longer is built. This has some ripple effect into
X11SurfaceData where the locking
code for DGA should then be removed as well as it demonstrably useless.
This code would only be interesting for the future if some very (very)
similar looking support
and even if the XFree86 DGA extension were interesting I don't think it
is sufficiently similar
to warrant keep the relatively few lines of around that might be relevant.
-phil.
