mirror of
https://github.com/k3s-io/k3s.git
synced 2024-06-07 19:41:36 +00:00
77 lines
1.7 KiB
Go
77 lines
1.7 KiB
Go
// +build !providerless
|
|
|
|
/*
|
|
Copyright 2019 The Kubernetes 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 azure
|
|
|
|
import (
|
|
"context"
|
|
"sync"
|
|
)
|
|
|
|
// lockMap used to lock on entries
|
|
type lockMap struct {
|
|
sync.Mutex
|
|
mutexMap map[string]*sync.Mutex
|
|
}
|
|
|
|
// NewLockMap returns a new lock map
|
|
func newLockMap() *lockMap {
|
|
return &lockMap{
|
|
mutexMap: make(map[string]*sync.Mutex),
|
|
}
|
|
}
|
|
|
|
// LockEntry acquires a lock associated with the specific entry
|
|
func (lm *lockMap) LockEntry(entry string) {
|
|
lm.Lock()
|
|
// check if entry does not exists, then add entry
|
|
if _, exists := lm.mutexMap[entry]; !exists {
|
|
lm.addEntry(entry)
|
|
}
|
|
|
|
lm.Unlock()
|
|
lm.lockEntry(entry)
|
|
}
|
|
|
|
// UnlockEntry release the lock associated with the specific entry
|
|
func (lm *lockMap) UnlockEntry(entry string) {
|
|
lm.Lock()
|
|
defer lm.Unlock()
|
|
|
|
if _, exists := lm.mutexMap[entry]; !exists {
|
|
return
|
|
}
|
|
lm.unlockEntry(entry)
|
|
}
|
|
|
|
func (lm *lockMap) addEntry(entry string) {
|
|
lm.mutexMap[entry] = &sync.Mutex{}
|
|
}
|
|
|
|
func (lm *lockMap) lockEntry(entry string) {
|
|
lm.mutexMap[entry].Lock()
|
|
}
|
|
|
|
func (lm *lockMap) unlockEntry(entry string) {
|
|
lm.mutexMap[entry].Unlock()
|
|
}
|
|
|
|
func getContextWithCancel() (context.Context, context.CancelFunc) {
|
|
return context.WithCancel(context.Background())
|
|
}
|