1 // This source code is dual-licensed under the Apache License, version
2 // 2.0, and the Mozilla Public License, version 1.1.
6 //---------------------------------------------------------------------------
7 // Copyright (C) 2007-2009 LShift Ltd., Cohesive Financial
8 // Technologies LLC., and Rabbit Technologies Ltd.
10 // Licensed under the Apache License, Version 2.0 (the "License");
11 // you may not use this file except in compliance with the License.
12 // You may obtain a copy of the License at
14 // http://www.apache.org/licenses/LICENSE-2.0
16 // Unless required by applicable law or agreed to in writing, software
17 // distributed under the License is distributed on an "AS IS" BASIS,
18 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 // See the License for the specific language governing permissions and
20 // limitations under the License.
21 //---------------------------------------------------------------------------
25 //---------------------------------------------------------------------------
26 // The contents of this file are subject to the Mozilla Public License
27 // Version 1.1 (the "License"); you may not use this file except in
28 // compliance with the License. You may obtain a copy of the License at
29 // http://www.rabbitmq.com/mpl.html
31 // Software distributed under the License is distributed on an "AS IS"
32 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
33 // License for the specific language governing rights and limitations
36 // The Original Code is The RabbitMQ .NET Client.
38 // The Initial Developers of the Original Code are LShift Ltd,
39 // Cohesive Financial Technologies LLC, and Rabbit Technologies Ltd.
41 // Portions created before 22-Nov-2008 00:00:00 GMT by LShift Ltd,
42 // Cohesive Financial Technologies LLC, or Rabbit Technologies Ltd
43 // are Copyright (C) 2007-2008 LShift Ltd, Cohesive Financial
44 // Technologies LLC, and Rabbit Technologies Ltd.
46 // Portions created by LShift Ltd are Copyright (C) 2007-2009 LShift
47 // Ltd. Portions created by Cohesive Financial Technologies LLC are
48 // Copyright (C) 2007-2009 Cohesive Financial Technologies
49 // LLC. Portions created by Rabbit Technologies Ltd are Copyright
50 // (C) 2007-2009 Rabbit Technologies Ltd.
52 // All Rights Reserved.
54 // Contributor(s): ______________________________________.
56 //---------------------------------------------------------------------------
58 using System.Collections;
59 using System.Threading;
61 namespace RabbitMQ.Util {
62 ///<summary>A classic counting semaphore.</summary>
64 /// The .NET framework does not introduce a counting semaphore
65 /// until framework release 2.0. Consequently, we implement one
66 /// here, for the benefit of .NET 1.1.
68 public class Semaphore {
71 ///<summary>Create a Semaphore, with its counter initialized
77 ///<summary>Create a Semaphore, with its counter initialized
78 ///to the value passed in.</summary>
79 public Semaphore(int initialCount)
81 m_count = initialCount;
84 ///<summary>Acquire a single resource, decrementing the count by one.</summary>
86 /// Not interruptable - will retry forever until a resource comes available.
101 ///<summary>Acquire a single resource, decrementing the count
102 ///by one and returning true, if a resource is available;
103 ///otherwise, return false immediately.</summary>
104 public bool TryWait() {
115 ///<summary>Release a single resource, incrementing the count
117 public void Release() {
124 ///<summary>Retrieve the current semaphore value.</summary>
126 /// Consider carefully whether this property is actually what
127 /// you want - usually, using this property is wrong, and
128 /// either Wait() or TryWait() is the correct choice.