[vbox-dev] savestate still hangs sometimes (reported before)

[Huihong Luo]

when 2D acceleration is enabled
 
c:\virtualbox-dev\vbox\out\win.x86\release\bin>VBoxManage.exe controlvm vm1 savestate
0%...
 
hangs after 0% is displayed.
 
If doing from the Close menu, after dialog box is displayed, then choose Save State, then works well.
 
I tried to break the code, it seems stop inside some Windows message loop.
 
renderspu_init.c
renderSPUWindowThreadProc()
{
...
else
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
...
}
 
This is very annoying. need to fix these crash bugs when vm is shutting down.
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