[ros-kernel] GDI Handle Issues

[Rex J. <re...@lv...>]

I just checked in some code to deal with GDI handles.  At least a few
things remain to be done:

When a process exits, a win32k function will need to be called that will
clean up all outstanding handles in the table.  This can be called from GDI32
DLL rundown I think.

I used a fast mutex to protect access to the table.  Is this a reasonable
sync object to use across processes?

GDI handles keep the process id as a field, but PsGetCurrentProcess does
not seem to be available to a kernel mode dll.  Which function is available
that returns the current process id?

Accoring to all I can find, GDI handles (and GDI functions) are not thread 
safe.
So I removed all the code that was locking and unlocking individual handles.
I originally added the handle locking code based on a hint from Wine.  However,
is code involving User handles expected to be thread safe?  I dont see how if
the underlying GDI calls are not, but its possible.  If so we cannot reuse the
GDI handle routines for User handles as I would like to.


Rex Jolliff
re...@lv...

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