mirror of https://github.com/k3s-io/k3s
77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
// +build !providerless
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/*
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Copyright 2019 The Kubernetes Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 azure
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import (
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"context"
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"sync"
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)
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// lockMap used to lock on entries
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type lockMap struct {
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sync.Mutex
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mutexMap map[string]*sync.Mutex
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}
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// NewLockMap returns a new lock map
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func newLockMap() *lockMap {
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return &lockMap{
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mutexMap: make(map[string]*sync.Mutex),
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}
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}
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// LockEntry acquires a lock associated with the specific entry
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func (lm *lockMap) LockEntry(entry string) {
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lm.Lock()
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// check if entry does not exists, then add entry
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if _, exists := lm.mutexMap[entry]; !exists {
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lm.addEntry(entry)
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}
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lm.Unlock()
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lm.lockEntry(entry)
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}
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// UnlockEntry release the lock associated with the specific entry
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func (lm *lockMap) UnlockEntry(entry string) {
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lm.Lock()
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defer lm.Unlock()
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if _, exists := lm.mutexMap[entry]; !exists {
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return
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}
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lm.unlockEntry(entry)
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}
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func (lm *lockMap) addEntry(entry string) {
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lm.mutexMap[entry] = &sync.Mutex{}
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}
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func (lm *lockMap) lockEntry(entry string) {
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lm.mutexMap[entry].Lock()
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}
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func (lm *lockMap) unlockEntry(entry string) {
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lm.mutexMap[entry].Unlock()
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}
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func getContextWithCancel() (context.Context, context.CancelFunc) {
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return context.WithCancel(context.Background())
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}
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