Fix occasional audio interface deadlock#4450
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Review please! I want to merge this soon, but I think it'd be better to wait for reviews. |
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Merging since there was no review and I can find any regressions. |
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Fixes #4406 by ensuring audio thread has read the
NULLbuffer before stop processing. Dropping them have caused several regressions(#4406, #3397, #3396, etc.) becausestopProcessingof backend can be called before it receivesNULLbuffer.Instead of relying on per-backend semaphores(Dropped for SDL in 98346f7, for JACK in 1dcacbb),
Mixer::fifoWriternow checks it.