tree 6b8dac8ec17119ad5b661b85cff30bffe1d4a645
parent 0d96fa05bf3f22942c372ecc93a7f6a44ecda30a
author Eric Laurent <elaurent@google.com> 1480634909 -0800
committer Eric Laurent <elaurent@google.com> 1480710099 -0800

improve audio effect framwework thread safety

- Reorganize handle effect creation code to make sure the effect engine
is created with both thread and effect chain mutex held.
- Reorganize handle disconnect code to make sure the effect engine
is released with both thread and effect chain mutex held.
- Protect IEffect interface methods in EffectHande with a Mutex.
- Only pin effect if the session was acquired first.
- Do not use strong pointer to EffectModule in EffectHandles:
only the EffectChain has a single strong reference to the EffectModule.

Test: Tested with EffectTest app. Regression tests in main audio use cases.

Bug: 32707507
Change-Id: Ia1098cba2cd32cc2d1c9dfdff4adc2388dfed80e