tree 1e2915d979cbd96ae0daeb2ef82cdf163723e197
parent 059aa2d79c8285ff768536a203e7b00adf248425
author Robert Wu <robertwu@google.com> 1646435845 +0000
committer Robert Wu <robertwu@google.com> 1647995154 +0000

AAudio: Use futex for waitForStateChange

WaitForStateChange currently waits in twenty millisecond intervals
for state changes. This is clearly inefficient and if apps use this
consistently, much extra latency is added. This CL adds futexes so
the callback fires almost immediately after a state change.

This CL also changes updateStateMachine so updates from non-callbacks
do not happen if a callback thread is running.

Bug: 70722092
Test: atest AAudioTests
Test: Oboe automated tests (./run_tests.sh)
Test: OboeTester Plug Latency Test
Change-Id: I186dc9ddac7f3897d82a5ed0043a5f45f1c19fe3