Add comments explaining about SCHED_FIFO (47d55173) · Commits · e / os / android_frameworks_av

media/libaudioclient/AudioTrack.cpp

+4 −0

Original line number	Original line	Diff line number	Diff line
	@@ -1414,6 +1414,9 @@ status_t AudioTrack::createTrack_l()

	pid_t tid = -1;		pid_t tid = -1;
	if (mFlags & AUDIO_OUTPUT_FLAG_FAST) {		if (mFlags & AUDIO_OUTPUT_FLAG_FAST) {
			// It is currently meaningless to request SCHED_FIFO for a Java thread. Even if the
			// application-level code follows all non-blocking design rules, the language runtime
			// doesn't also follow those rules, so the thread will not benefit overall.
	if (mAudioTrackThread != 0 && !mThreadCanCallJava) {		if (mAudioTrackThread != 0 && !mThreadCanCallJava) {
	tid = mAudioTrackThread->getTid();		tid = mAudioTrackThread->getTid();
	}		}
	@@ -2948,6 +2951,7 @@ bool AudioTrack::AudioTrackThread::threadLoop()
	mPausedInt = false;		mPausedInt = false;
	}		}
	if (mPausedInt) {		if (mPausedInt) {
			// TODO use futex instead of condition, for event flag "or"
	if (mPausedNs > 0) {		if (mPausedNs > 0) {
	(void) mMyCond.waitRelative(mMyLock, mPausedNs);		(void) mMyCond.waitRelative(mMyLock, mPausedNs);
	} else {		} else {