3 // SimpleConcurrentBag.cs
6 // Jérémie "Garuma" Laval <jeremie.laval@gmail.com>
8 // Copyright (c) 2009 Jérémie "Garuma" Laval
10 // Permission is hereby granted, free of charge, to any person obtaining a copy
11 // of this software and associated documentation files (the "Software"), to deal
12 // in the Software without restriction, including without limitation the rights
13 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
14 // copies of the Software, and to permit persons to whom the Software is
15 // furnished to do so, subject to the following conditions:
17 // The above copyright notice and this permission notice shall be included in
18 // all copies or substantial portions of the Software.
20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
23 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
24 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
25 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
29 using System.Threading;
31 namespace System.Threading.Tasks
34 internal class SimpleConcurrentBag<T>
36 readonly IDequeOperations<T>[] deques;
43 public SimpleConcurrentBag (int num)
45 deques = new CyclicDeque<T>[num];
46 for (int i = 0; i < deques.Length; i++) {
47 deques[i] = new CyclicDeque<T> ();
52 public int GetNextIndex ()
54 return Interlocked.Increment (ref index);
57 public bool TryTake (int index, out T value)
61 return deques[index].PopBottom (out value) == PopResult.Succeed;
64 public bool TrySteal (int index, out T value)
71 const int roundThreshold = 3;
73 for (int round = 0; round < roundThreshold; ++round) {
74 if (stealIndex == index)
75 stealIndex = (stealIndex + 1) % deques.Length;
77 if (deques[(stealIndex = (stealIndex + 1) % deques.Length)].PopTop (out value) == PopResult.Succeed)
84 public void Add (int index, T value)
86 deques[index].PushBottom (value);