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key_rwlock.go
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key_rwlock.go
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// Copyright 2020-2023 Buf Technologies, 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 bandeps
import "sync"
// You can never hold more than one key at a time! We do not enforce lock ordering!
type keyRWLock struct {
keyToRWLock map[string]*sync.RWMutex
lock sync.Mutex
}
func newKeyRWLock() *keyRWLock {
return &keyRWLock{
keyToRWLock: make(map[string]*sync.RWMutex),
}
}
func (k *keyRWLock) RLock(key string) {
k.getRWLock(key).Lock()
}
func (k *keyRWLock) RUnlock(key string) {
k.getRWLock(key).Unlock()
}
func (k *keyRWLock) Lock(key string) {
k.getRWLock(key).Lock()
}
func (k *keyRWLock) Unlock(key string) {
k.getRWLock(key).Unlock()
}
func (k *keyRWLock) getRWLock(key string) *sync.RWMutex {
k.lock.Lock()
rwLock, ok := k.keyToRWLock[key]
if !ok {
rwLock = &sync.RWMutex{}
k.keyToRWLock[key] = rwLock
}
k.lock.Unlock()
return rwLock
}