[Bug 27795] Half-Life 2 hangs with a black screen on launch

http://bugs.winehq.org/show_bug.cgi?id=27795

--- Comment #2 from Andrew Eikum  2011-07-18 11:24:45 CDT ---
Created an attachment (id=35593)
 --> (http://bugs.winehq.org/attachment.cgi?id=35593)
winmm: Perform Open and Close callbacks from client thread

There was a deadlock because the MCIAVI thread held a lock during waveOutOpen,
and acquires the lock again in its callback function. So, waveOutOpen needs to
do its callback on the client thread so the recursive lock can work. This
should be fixed by the attached patch.