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/*
* Copyright (C) 2021 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.internal.util;
import android.util.Slog;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
* A helper class to handle gc'ing a process, mainly used for testing.
*
* @hide
*/
public final class GcUtils {
private static final String TAG = GcUtils.class.getSimpleName();
/**
* Runs a GC and attempts to wait for finalization.
*/
public static void runGcAndFinalizersSync() {
Runtime.getRuntime().gc();
Runtime.getRuntime().runFinalization();
final CountDownLatch fence = new CountDownLatch(1);
createFinalizationObserver(fence);
try {
do {
Runtime.getRuntime().gc();
Runtime.getRuntime().runFinalization();
} while (!fence.await(100, TimeUnit.MILLISECONDS));
} catch (InterruptedException ex) {
throw new RuntimeException(ex);
}
Slog.v(TAG, "Running gc and finalizers");
}
/**
* Create the observer in the scope of a method to minimize the chance that
* it remains live in a DEX/machine register at the point of the fence guard.
* This must be kept to avoid R8 inlining it.
*/
private static void createFinalizationObserver(CountDownLatch fence) {
new Object() {
@Override
protected void finalize() throws Throwable {
try {
fence.countDown();
} finally {
super.finalize();
}
}
};
}
// Uninstantiable
private GcUtils() {}
}
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