/*
 * Minio Cloud Storage, (C) 2016 Minio, Inc.
 *
 * 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 main

import "sync"

type nameSpaceParam struct {
	volume string
	path   string
}

type nameSpaceLock struct {
	rwMutex *sync.RWMutex
	count   uint
}

func (nsLock nameSpaceLock) InUse() bool {
	return nsLock.count != 0
}

func (nsLock nameSpaceLock) Lock() {
	nsLock.Lock()
	nsLock.count++
}

func (nsLock nameSpaceLock) Unlock() {
	nsLock.Unlock()
	if nsLock.count != 0 {
		nsLock.count--
	}
}

func (nsLock nameSpaceLock) RLock() {
	nsLock.RLock()
	nsLock.count++
}

func (nsLock nameSpaceLock) RUnlock() {
	nsLock.RUnlock()
	if nsLock.count != 0 {
		nsLock.count--
	}
}

func newNameSpaceLock() nameSpaceLock {
	return nameSpaceLock{rwMutex: &sync.RWMutex{}, count: 0}
}