AudioTrack and AudioRecord: add stopAndJoinCallbacks()
Explicitly force callbacks to stop running.
This is needed to prevent a race condition with
the callbacks running after a close.
Bug: 164411271
Bug: 143305727
Bug: 182954108
Test: atest CtsNativeMediaAAudioTestCases
Test: libaaudio/tests/test_callback_race.cpp
Change-Id: Ia86c758d7f1c281a5d933bc384283440e1f1a756
diff --git a/media/libaudioclient/AudioTrack.cpp b/media/libaudioclient/AudioTrack.cpp
index 6c9e85c..1bc3baa 100644
--- a/media/libaudioclient/AudioTrack.cpp
+++ b/media/libaudioclient/AudioTrack.cpp
@@ -327,21 +327,9 @@
.set(AMEDIAMETRICS_PROP_STATUS, (int32_t)mStatus)
.record();
+ stopAndJoinCallbacks(); // checks mStatus
+
if (mStatus == NO_ERROR) {
- // Make sure that callback function exits in the case where
- // it is looping on buffer full condition in obtainBuffer().
- // Otherwise the callback thread will never exit.
- stop();
- if (mAudioTrackThread != 0) {
- mProxy->interrupt();
- mAudioTrackThread->requestExit(); // see comment in AudioTrack.h
- mAudioTrackThread->requestExitAndWait();
- mAudioTrackThread.clear();
- }
- // No lock here: worst case we remove a NULL callback which will be a nop
- if (mDeviceCallback != 0 && mOutput != AUDIO_IO_HANDLE_NONE) {
- AudioSystem::removeAudioDeviceCallback(this, mOutput, mPortId);
- }
IInterface::asBinder(mAudioTrack)->unlinkToDeath(mDeathNotifier, this);
mAudioTrack.clear();
mCblkMemory.clear();
@@ -355,6 +343,29 @@
}
}
+void AudioTrack::stopAndJoinCallbacks() {
+ // Prevent nullptr crash if it did not open properly.
+ if (mStatus != NO_ERROR) return;
+
+ // Make sure that callback function exits in the case where
+ // it is looping on buffer full condition in obtainBuffer().
+ // Otherwise the callback thread will never exit.
+ stop();
+ if (mAudioTrackThread != 0) { // not thread safe
+ mProxy->interrupt();
+ mAudioTrackThread->requestExit(); // see comment in AudioTrack.h
+ mAudioTrackThread->requestExitAndWait();
+ mAudioTrackThread.clear();
+ }
+ // No lock here: worst case we remove a NULL callback which will be a nop
+ if (mDeviceCallback != 0 && mOutput != AUDIO_IO_HANDLE_NONE) {
+ // This may not stop all of these device callbacks!
+ // TODO: Add some sort of protection.
+ AudioSystem::removeAudioDeviceCallback(this, mOutput, mPortId);
+ mDeviceCallback.clear();
+ }
+}
+
status_t AudioTrack::set(
audio_stream_type_t streamType,
uint32_t sampleRate,