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lock_timeout.go
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lock_timeout.go
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// Copyright 2019 PayPal Inc.
//
// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 lib
import (
"sync/atomic"
)
// LockTimeout is a non-blocking best-effort mutex
type LockTimeout struct {
frontLock int32 // sync.Mutex
}
// TryLock is attempting to acquire the lock
// Returns
// 1 if lock acquired,
// 0 if lock no available
func (lt *LockTimeout) TryLock() int {
brv := atomic.CompareAndSwapInt32(<.frontLock, 0, 1)
if brv {
return 1
}
return 0
}
// Unlock releases the lock
func (lt *LockTimeout) Unlock() {
atomic.StoreInt32(<.frontLock, 0)
}