3 // Copyright (c) 2011 Novell
6 // Jérémie "garuma" Laval
8 // Permission is hereby granted, free of charge, to any person obtaining a copy
9 // of this software and associated documentation files (the "Software"), to deal
10 // in the Software without restriction, including without limitation the rights
11 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 // copies of the Software, and to permit persons to whom the Software is
13 // furnished to do so, subject to the following conditions:
15 // The above copyright notice and this permission notice shall be included in
16 // all copies or substantial portions of the Software.
18 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
28 #if NET_4_0 || MOBILE || BOOTSTRAP_NET_4_0 || INSIDE_SYSTEM_WEB
31 using System.Threading;
32 using System.Collections;
33 using System.Collections.Generic;
34 using System.Runtime.Serialization;
36 namespace System.Collections.Concurrent
38 internal abstract class ObjectPool<T> where T : class
40 const int capacity = 20;
41 const int bit = 0x8000000;
49 buffer = new T[capacity];
50 for (int i = 0; i < capacity; i++)
51 buffer[i] = Creator ();
52 addIndex = capacity - 1;
55 protected abstract T Creator ();
59 if ((addIndex & ~bit) - 1 == removeIndex)
68 if ((addIndex & ~bit) - 1 == i || tries == 0)
70 result = buffer[i % capacity];
71 } while (Interlocked.CompareExchange (ref removeIndex, i + 1, i) != i && --tries > -1);
76 public void Release (T obj)
78 if (obj == null || addIndex - removeIndex >= capacity - 1)
86 } while ((i & bit) > 0);
87 if (i - removeIndex >= capacity - 1)
89 } while (Interlocked.CompareExchange (ref addIndex, i + 1 + bit, i) != i && --tries > 0);
91 buffer[i % capacity] = obj;
92 addIndex = addIndex - bit;