mirror of https://github.com/kubernetes/kops.git
69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
/*
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Copyright 2023 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 mutexes
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import (
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"sync"
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)
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var InProcess LocalMutexes
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// LocalMutexes is a store of named mutexes, used to avoid concurrent local operations.
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// For example, GCE project IAM mutation uses a read / conditional-write approach,
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// so we try to avoid making two local concurrent calls to the same project.
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type LocalMutexes struct {
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mutex sync.Mutex
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mutexes map[string]*localMutex
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}
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func (m *LocalMutexes) Get(key string) LocalMutex {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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if m.mutexes == nil {
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m.mutexes = make(map[string]*localMutex)
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}
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l := m.mutexes[key]
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if l == nil {
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l = &localMutex{}
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m.mutexes[key] = l
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}
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return l
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}
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// LocalMutex is the interface for local mutexes.
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type LocalMutex interface {
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Lock()
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Unlock()
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}
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// localMutex implements LocalMutex.
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type localMutex struct {
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m sync.Mutex
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}
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// Lock implements LocalMutex.
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func (m *localMutex) Lock() {
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m.m.Lock()
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}
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// Unlock implements LocalMutex.
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func (m *localMutex) Unlock() {
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m.m.Unlock()
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}
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