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71 lines
1.8 KiB
71 lines
1.8 KiB
/*
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* Minio Cloud Storage, (C) 2016 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package main
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import "sync"
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// nameSpaceParam - carries name space resource.
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type nameSpaceParam struct {
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volume string
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path string
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}
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// nameSpaceLock - provides primitives for locking critical namespace regions.
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type nameSpaceLock struct {
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rwMutex *sync.RWMutex
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count uint
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}
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func (nsLock *nameSpaceLock) InUse() bool {
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return nsLock.count != 0
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}
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// Lock acquires write lock and increments the namespace counter.
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func (nsLock *nameSpaceLock) Lock() {
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nsLock.rwMutex.Lock()
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nsLock.count++
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}
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// Unlock releases write lock and decrements the namespace counter.
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func (nsLock *nameSpaceLock) Unlock() {
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nsLock.rwMutex.Unlock()
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if nsLock.count != 0 {
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nsLock.count--
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}
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}
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// RLock acquires read lock and increments the namespace counter.
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func (nsLock *nameSpaceLock) RLock() {
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nsLock.rwMutex.RLock()
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nsLock.count++
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}
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// RUnlock release read lock and decrements the namespace counter.
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func (nsLock *nameSpaceLock) RUnlock() {
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nsLock.rwMutex.RUnlock()
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if nsLock.count != 0 {
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nsLock.count--
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}
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}
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// newNSLock - provides a new instance of namespace locking primitives.
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func newNSLock() *nameSpaceLock {
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return &nameSpaceLock{
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rwMutex: &sync.RWMutex{},
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count: 0,
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}
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}
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