[Bug 29657] winecoreaudio memory management and locking seems to be broken

http://bugs.winehq.org/show_bug.cgi?id=29657

--- Comment #2 from Jörg Höhle  2012-01-23 08:29:34 CST ---
I had not enough time with the Mac over the week-end. The sketch is:
1. Introduce lock-less callbacks and remove mid-function unlocks,
   adding This->queued_buffers and a boolean "used" slot to each AQBuf;
   The new cb is merely: buf->used = 0;
   Requires code to move from queued_buffers to This->avail_buffers;
2. Change remaining OSSpinLock to CriticalSection;
3. Later perhaps merge the current GetPosition queued_bufinfos into
queued_buffers.
   The timestamp therein would benefit capture too.