| #region Copyright notice and license |
| |
| // Copyright 2015 gRPC 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. |
| |
| #endregion |
| |
| using System; |
| using System.Threading; |
| |
| namespace Grpc.Core.Internal |
| { |
| internal class AtomicCounter |
| { |
| long counter = 0; |
| |
| public AtomicCounter(long initialCount = 0) |
| { |
| this.counter = initialCount; |
| } |
| |
| public long Increment() |
| { |
| return Interlocked.Increment(ref counter); |
| } |
| |
| public void IncrementIfNonzero(ref bool success) |
| { |
| long origValue = counter; |
| while (true) |
| { |
| if (origValue == 0) |
| { |
| success = false; |
| return; |
| } |
| long result = Interlocked.CompareExchange(ref counter, origValue + 1, origValue); |
| if (result == origValue) |
| { |
| success = true; |
| return; |
| }; |
| origValue = result; |
| } |
| } |
| |
| public long Decrement() |
| { |
| return Interlocked.Decrement(ref counter); |
| } |
| |
| public long Count |
| { |
| get |
| { |
| return Interlocked.Read(ref counter); |
| } |
| } |
| } |
| } |