mirror of
https://gitee.com/milvus-io/milvus.git
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133 lines
2.7 KiB
Go
133 lines
2.7 KiB
Go
// Licensed to the LF AI & Data foundation under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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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package lock
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import (
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"sync"
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"go.uber.org/zap"
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"github.com/milvus-io/milvus/pkg/log"
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)
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type RefLock struct {
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mutex sync.RWMutex
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refCounter int
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}
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func (m *RefLock) ref() {
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m.refCounter++
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}
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func (m *RefLock) unref() {
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m.refCounter--
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}
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func newRefLock() *RefLock {
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c := RefLock{
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sync.RWMutex{},
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0,
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}
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return &c
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}
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type KeyLock struct {
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keyLocksMutex sync.Mutex
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refLocks map[string]*RefLock
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}
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func NewKeyLock() *KeyLock {
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keyLock := KeyLock{
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refLocks: make(map[string]*RefLock),
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}
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return &keyLock
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}
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func (k *KeyLock) Lock(key string) {
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k.keyLocksMutex.Lock()
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// update the key map
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if keyLock, ok := k.refLocks[key]; ok {
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keyLock.ref()
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k.keyLocksMutex.Unlock()
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keyLock.mutex.Lock()
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} else {
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newKLock := newRefLock()
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newKLock.mutex.Lock()
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k.refLocks[key] = newKLock
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newKLock.ref()
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k.keyLocksMutex.Unlock()
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return
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}
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}
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func (k *KeyLock) Unlock(lockedKey string) {
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k.keyLocksMutex.Lock()
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defer k.keyLocksMutex.Unlock()
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keyLock, ok := k.refLocks[lockedKey]
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if !ok {
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log.Warn("Unlocking non-existing key", zap.String("key", lockedKey))
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return
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}
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keyLock.unref()
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if keyLock.refCounter == 0 {
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delete(k.refLocks, lockedKey)
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}
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keyLock.mutex.Unlock()
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}
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func (k *KeyLock) RLock(key string) {
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k.keyLocksMutex.Lock()
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// update the key map
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if keyLock, ok := k.refLocks[key]; ok {
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keyLock.ref()
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k.keyLocksMutex.Unlock()
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keyLock.mutex.RLock()
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} else {
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newKLock := newRefLock()
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newKLock.mutex.RLock()
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k.refLocks[key] = newKLock
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newKLock.ref()
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k.keyLocksMutex.Unlock()
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return
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}
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}
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func (k *KeyLock) RUnlock(lockedKey string) {
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k.keyLocksMutex.Lock()
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defer k.keyLocksMutex.Unlock()
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keyLock, ok := k.refLocks[lockedKey]
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if !ok {
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log.Warn("Unlocking non-existing key", zap.String("key", lockedKey))
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return
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}
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keyLock.unref()
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if keyLock.refCounter == 0 {
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delete(k.refLocks, lockedKey)
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}
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keyLock.mutex.RUnlock()
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}
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func (k *KeyLock) size() int {
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k.keyLocksMutex.Lock()
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defer k.keyLocksMutex.Unlock()
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return len(k.refLocks)
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}
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