Audio Effect Management EffectModule and EffectChain classes both have their own mutex to protect state changes or resource modifications. Always respect the following order if multiple mutexes must be acquired to avoid cross deadlock: AudioFlinger -> ThreadBase -> EffectChain -> EffectModule In addition, methods that lock the AudioPolicyService mutex (getOutputForEffect(), startOutput()...) should never be called with AudioFlinger or Threadbase mutex locked to avoid cross deadlock with other clients calling AudioPolicyService methods that in turn call AudioFlinger thus locking the same mutexes in the reverse order.

Effects.cpp
Effects.h

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