| /* |
| * 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.compatqual.NullableDecl; |
| |
| /** |
| * 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(@NullableDecl 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)); |
| } |
| } |