Small VibrationThread fixes.

    static final float RAMP_OFF_AMPLITUDE_MIN = 1e-3f;

    static final List<Step> EMPTY_STEP_LIST = new ArrayList<>();

    private final Object mLock = new Object();

    // Used within steps.

    public final VibrationSettings vibrationSettings;

    public final DeviceVibrationEffectAdapter deviceEffectAdapter;

    private final Queue<Step> mPendingOnVibratorCompleteSteps = new LinkedList<>();

    // Signalling fields.

    // Note that vibrator callback signals may happen inside vibrator HAL calls made by the

    // VibrationThread, or on an external executor, so this lock should not be held for anything

    // other than updating signalling state - particularly not during HAL calls or when invoking

    // other callbacks that may trigger calls into the thread.

    private final Object mLock = new Object();

    @GuardedBy("mLock")

    private final IntArray mSignalVibratorsComplete;

    @GuardedBy("mLock")

     * The state update is recorded for processing on the main execution thread (VibrationThread).

     */

    public void notifyVibratorComplete(int vibratorId) {

        if (Build.IS_DEBUGGABLE) {

            expectIsVibrationThread(false);

        }

        // HAL callbacks may be triggered directly within HAL calls, so these notifications

        // could be on the VibrationThread as it calls the HAL, or some other executor later.

        // Therefore no thread assertion is made here.

        if (DEBUG) {

            Slog.d(TAG, "Vibration complete reported by vibrator " + vibratorId);

     * (VibrationThread).

     */

    public void notifySyncedVibrationComplete() {

        if (Build.IS_DEBUGGABLE) {

            expectIsVibrationThread(false);

        }

        // HAL callbacks may be triggered directly within HAL calls, so these notifications

        // could be on the VibrationThread as it calls the HAL, or some other executor later.

        // Therefore no thread assertion is made here.

        if (DEBUG) {

            Slog.d(TAG, "Synced vibration complete reported by vibrator manager");

        int[] vibratorsToProcess = null;

        boolean doCancel = false;

        boolean doCancelImmediate = false;

        // Swap out the queue of completions to process.

        // Collect signals to process, but don't keep the lock while processing them.

        synchronized (mLock) {

            if (mSignalCancelImmediate) {

                if (mCancelledImmediately) {

                doCancel = true;

            }

            if (!doCancelImmediate && mSignalVibratorsComplete.size() > 0) {

                // Swap out the queue of completions to process.

                vibratorsToProcess = mSignalVibratorsComplete.toArray();  // makes a copy

                mSignalVibratorsComplete.clear();

            }

import android.os.PowerManager;

import android.os.Process;

import android.os.RemoteException;

import android.os.SystemClock;

import android.os.Trace;

import android.os.WorkSource;

import android.util.Slog;

     * @return true if the vibration completed, or false if waiting timed out.

     */

    public boolean waitForThreadIdle(long maxWaitMillis) {

        long now = System.currentTimeMillis();

        long now = SystemClock.elapsedRealtime();

        long deadline = now + maxWaitMillis;

        synchronized (mLock) {

            while (true) {

                } catch (InterruptedException e) {

                    Slog.w(TAG, "VibrationThread interrupted waiting to stop, continuing");

                }

                now = System.currentTimeMillis();

                now = SystemClock.elapsedRealtime();

            }

        }

    }