mcs/class/corlib/System.Threading/Interlocked.cs

   1 //
   2 // System.Threading.Interlocked.cs
   3 //
   4 // Author:
   5 //        Patrik Torstensson (patrik.torstensson@labs2.com)
   6 //   Dick Porter (dick@ximian.com)
   7 //
   8 // (C) Ximian, Inc.  http://www.ximian.com
   9 //
  10
  11 //
  12 // Copyright (C) 2004, 2005 Novell, Inc (http://www.novell.com)
  13 //
  14 // Permission is hereby granted, free of charge, to any person obtaining
  15 // a copy of this software and associated documentation files (the
  16 // "Software"), to deal in the Software without restriction, including
  17 // without limitation the rights to use, copy, modify, merge, publish,
  18 // distribute, sublicense, and/or sell copies of the Software, and to
  19 // permit persons to whom the Software is furnished to do so, subject to
  20 // the following conditions:
  21 //
  22 // The above copyright notice and this permission notice shall be
  23 // included in all copies or substantial portions of the Software.
  24 //
  25 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  29 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  30 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  31 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  32 //
  33
  34 using System;
  35 using System.Runtime.CompilerServices;
  36 using System.Runtime.InteropServices;
  37 using System.Runtime.ConstrainedExecution;
  38
  39 namespace System.Threading
  40 {
  41         public static class Interlocked
  42         {
  43                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  44                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  45                 public extern static int CompareExchange(ref int location1, int value, int comparand);
  46
  47                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  48                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  49                 internal extern static int CompareExchange(ref int location1, int value, int comparand, ref bool succeeded);
  50
  51                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  52                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  53                 public extern static object CompareExchange(ref object location1, object value, object comparand);
  54
  55                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  56                 public extern static float CompareExchange(ref float location1, float value, float comparand);
  57
  58                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  59                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  60                 public extern static int Decrement(ref int location);
  61
  62                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  63                 public extern static long Decrement(ref long location);
  64
  65                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  66                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  67                 public extern static int Increment(ref int location);
  68
  69                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  70                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  71                 public extern static long Increment(ref long location);
  72
  73                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  74                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  75                 public extern static int Exchange(ref int location1, int value);
  76
  77                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  78                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  79                 public extern static object Exchange(ref object location1, object value);
  80
  81                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  82                 public extern static float Exchange(ref float location1, float value);
  83
  84                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  85                 public extern static long CompareExchange(ref long location1, long value, long comparand);
  86
  87                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
  88                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  89                 public extern static IntPtr CompareExchange(ref IntPtr location1, IntPtr value, IntPtr comparand);
  90
  91                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  92                 public extern static double CompareExchange(ref double location1, double value, double comparand);
  93
  94                 [ComVisible (false)]
  95                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  96                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
  97                 public extern static T CompareExchange<T> (ref T location1, T value, T comparand) where T:class;
  98
  99                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 100                 public extern static long Exchange(ref long location1, long value);
 101
 102                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 103                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 104                 public extern static IntPtr Exchange(ref IntPtr location1, IntPtr value);
 105
 106                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 107                 public extern static double Exchange(ref double location1, double value);
 108
 109                 [ComVisible (false)]
 110                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 111                 [ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
 112                 public extern static T Exchange<T> (ref T location1, T value) where T:class;
 113
 114                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 115                 public extern static long Read(ref long location);
 116
 117                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 118                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 119                 public extern static int Add(ref int location1, int value);
 120
 121                 [ReliabilityContractAttribute (Consistency.WillNotCorruptState, Cer.Success)]
 122                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 123                 public extern static long Add(ref long location1, long value);
 124
 125                 public static void MemoryBarrier () {
 126                         Thread.MemoryBarrier ();
 127                 }
 128         }
 129 }