com.google.common.util.concurrent.OverflowAvoidingLockSupport Maven / Gradle / Ivy
/*
* Copyright (C) 2020 The Guava Authors
*
* 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.google.common.util.concurrent;
import static java.lang.Math.min;
import java.util.concurrent.locks.LockSupport;
import org.checkerframework.checker.nullness.qual.Nullable;
/**
* Works around an android bug, where parking for more than INT_MAX seconds can produce an abort
* signal on 32 bit devices running Android Q.
*/
final class OverflowAvoidingLockSupport {
// Represents the max nanoseconds representable on a linux timespec with a 32 bit tv_sec
static final long MAX_NANOSECONDS_THRESHOLD = (1L + Integer.MAX_VALUE) * 1_000_000_000L - 1L;
private OverflowAvoidingLockSupport() {}
static void parkNanos(@Nullable Object blocker, long nanos) {
// Even in the extremely unlikely event that a thread unblocks itself early after only 68 years,
// this is indistinguishable from a spurious wakeup, which LockSupport allows.
LockSupport.parkNanos(blocker, min(nanos, MAX_NANOSECONDS_THRESHOLD));
}
}