1 #if NET_4_0 || BOOTSTRAP_NET_4_0
4 // Copyright (c) 2008 Jérémie "Garuma" Laval
6 // Permission is hereby granted, free of charge, to any person obtaining a copy
7 // of this software and associated documentation files (the "Software"), to deal
8 // in the Software without restriction, including without limitation the rights
9 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 // copies of the Software, and to permit persons to whom the Software is
11 // furnished to do so, subject to the following conditions:
13 // The above copyright notice and this permission notice shall be included in
14 // all copies or substantial portions of the Software.
16 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
28 namespace System.Threading
30 internal class AtomicBoolean
36 public bool CompareAndExchange (bool expected, bool newVal)
38 int newTemp = newVal ? Set : UnSet;
39 int expectedTemp = expected ? Set : UnSet;
41 return Interlocked.CompareExchange (ref flag, newTemp, expectedTemp) == expectedTemp;
44 public static AtomicBoolean FromValue (bool value)
46 AtomicBoolean temp = new AtomicBoolean ();
54 return !Exchange (true);
57 public bool Exchange (bool newVal)
59 int newTemp = newVal ? Set : UnSet;
60 return Interlocked.Exchange (ref flag, newTemp) == Set;
72 public bool Equals (AtomicBoolean rhs)
74 return this.flag == rhs.flag;
77 public override bool Equals (object rhs)
79 return rhs is AtomicBoolean ? Equals ((AtomicBoolean)rhs) : false;
82 public override int GetHashCode ()
84 return flag.GetHashCode ();
87 public static explicit operator bool (AtomicBoolean rhs)
92 public static implicit operator AtomicBoolean (bool rhs)
94 return AtomicBoolean.FromValue (rhs);