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bugfix: add locker util and fix thread-unsafe problems for cdn
Signed-off-by: Starnop <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,64 @@ | ||
| /* | ||
| * Copyright The Dragonfly 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 util | ||
|
|
||
| import ( | ||
| "sync" | ||
|
|
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| cutil "github.com/dragonflyoss/Dragonfly/common/util" | ||
| ) | ||
|
|
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| type countRWMutex struct { | ||
| count *cutil.AtomicInt | ||
| sync.RWMutex | ||
| } | ||
|
|
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| func newCountRWMutex() *countRWMutex { | ||
| return &countRWMutex{ | ||
| count: cutil.NewAtomicInt(0), | ||
| } | ||
| } | ||
|
|
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| func (cr *countRWMutex) reset() { | ||
| cr.count.Set(0) | ||
| } | ||
|
|
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| func (cr *countRWMutex) increaseCount() int32 { | ||
| cr.count.Add(1) | ||
| return cr.count.Get() | ||
| } | ||
|
|
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| func (cr *countRWMutex) decreaseCount() int32 { | ||
| cr.count.Add(-1) | ||
| return cr.count.Get() | ||
| } | ||
|
|
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| func (cr *countRWMutex) lock(ro bool) { | ||
| if ro { | ||
| cr.RLock() | ||
| return | ||
| } | ||
| cr.Lock() | ||
| } | ||
|
|
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| func (cr *countRWMutex) unlock(ro bool) { | ||
| if ro { | ||
| cr.RUnlock() | ||
| return | ||
| } | ||
| cr.Unlock() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| * Copyright The Dragonfly 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 util | ||
|
|
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| import ( | ||
| "sync" | ||
| ) | ||
|
|
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| // LockerPool is a set of reader/writer mutual exclusion locks. | ||
| type LockerPool struct { | ||
| // use syncPool to cache allocated but unused *countRWMutex items for later reuse | ||
| syncPool *sync.Pool | ||
|
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| lockerMap map[string]*countRWMutex | ||
| sync.Mutex | ||
| } | ||
|
|
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| // NewLockerPool returns a *LockerPool with self-defined prefix. | ||
| func NewLockerPool() *LockerPool { | ||
| return &LockerPool{ | ||
| syncPool: &sync.Pool{ | ||
| New: func() interface{} { | ||
| return newCountRWMutex() | ||
| }, | ||
| }, | ||
| lockerMap: make(map[string]*countRWMutex), | ||
| } | ||
| } | ||
|
|
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| // GetLock locks key. | ||
| // If ro(readonly) is true, then it locks key for reading. | ||
| // Otherwise, locks key for writing. | ||
| func (l *LockerPool) GetLock(key string, ro bool) { | ||
| l.Lock() | ||
|
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| locker, ok := l.lockerMap[key] | ||
| if !ok { | ||
| locker = l.syncPool.Get().(*countRWMutex) | ||
| l.lockerMap[key] = locker | ||
| } | ||
|
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| locker.increaseCount() | ||
| l.Unlock() | ||
|
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| locker.lock(ro) | ||
| } | ||
|
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| // ReleaseLock unlocks key. | ||
| // If ro(readonly) is true, then it unlocks key for reading. | ||
| // Otherwise, unlocks key for writing. | ||
| func (l *LockerPool) ReleaseLock(key string, ro bool) { | ||
| l.Lock() | ||
| defer l.Unlock() | ||
|
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| locker, ok := l.lockerMap[key] | ||
| if !ok { | ||
| return | ||
| } | ||
|
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| locker.unlock(ro) | ||
| if locker.decreaseCount() < 1 { | ||
| locker.reset() | ||
| l.syncPool.Put(locker) | ||
| delete(l.lockerMap, key) | ||
| } | ||
| } |