| // Licensed to Apache Software Foundation (ASF) under one or more contributor |
| // license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright |
| // ownership. Apache Software Foundation (ASF) licenses this file to you 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. |
| |
| //go:build !windows |
| |
| package mmap |
| |
| import "sync/atomic" |
| |
| func (q *Queue) lock(segmentID int64) { |
| index := q.GetIndex(segmentID) |
| q.lockByIndex(index) |
| } |
| |
| func (q *Queue) unlock(segmentID int64) { |
| index := q.GetIndex(segmentID) |
| q.unlockByIndex(index) |
| } |
| |
| func (q *Queue) lockByIndex(index int) { |
| for !atomic.CompareAndSwapInt32(&q.locker[index], 0, 1) { |
| } |
| } |
| |
| func (q *Queue) unlockByIndex(index int) { |
| for !atomic.CompareAndSwapInt32(&q.locker[index], 1, 0) { |
| } |
| } |
