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

   1 //
   2 // System.Threading.WaitHandle.cs
   3 //
   4 // Author:
   5 //      Dick Porter (dick@ximian.com)
   6 //      Gonzalo Paniagua Javier (gonzalo@ximian.com
   7 //
   8 // (C) 2002,2003 Ximian, Inc.   (http://www.ximian.com)
   9 // Copyright (C) 2004-2005 Novell, Inc (http://www.novell.com)
  10 //
  11 // Permission is hereby granted, free of charge, to any person obtaining
  12 // a copy of this software and associated documentation files (the
  13 // "Software"), to deal in the Software without restriction, including
  14 // without limitation the rights to use, copy, modify, merge, publish,
  15 // distribute, sublicense, and/or sell copies of the Software, and to
  16 // permit persons to whom the Software is furnished to do so, subject to
  17 // the following conditions:
  18 //
  19 // The above copyright notice and this permission notice shall be
  20 // included in all copies or substantial portions of the Software.
  21 //
  22 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  23 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  24 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  25 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  26 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  27 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  28 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  29 //
  30
  31 using System;
  32 using System.Reflection;
  33 using System.Runtime.CompilerServices;
  34 using System.Runtime.Remoting.Contexts;
  35 using System.Security.Permissions;
  36 using System.Runtime.InteropServices;
  37 using Microsoft.Win32.SafeHandles;
  38 using System.Runtime.ConstrainedExecution;
  39
  40 namespace System.Threading
  41 {
  42         [StructLayout (LayoutKind.Sequential)]
  43         public abstract partial class WaitHandle
  44                 : MarshalByRefObject, IDisposable
  45         {
  46                 protected static readonly IntPtr InvalidHandle = (IntPtr) (-1);
  47
  48                 static int WaitMultiple(WaitHandle[] waitHandles, int millisecondsTimeout, bool exitContext, bool WaitAll)
  49                 {
  50 #if MONOTOUCH
  51                         if (exitContext)
  52                                 throw new NotSupportedException ("exitContext == true is not supported");
  53 #endif
  54
  55                         try {
  56                                 if (exitContext)
  57                                         SynchronizationAttribute.ExitContext ();
  58
  59                                 if (WaitAll)
  60                                         return WaitAll_internal (waitHandles, millisecondsTimeout, exitContext);
  61                                 else
  62                                         return WaitAny_internal (waitHandles, millisecondsTimeout, exitContext);
  63                         } finally {
  64                                 if (exitContext)
  65                                         SynchronizationAttribute.EnterContext ();
  66                         }
  67                 }
  68
  69                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  70                 private static extern int WaitAll_internal(WaitHandle[] handles, int ms, bool exitContext);
  71
  72                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  73                 private static extern int WaitAny_internal(WaitHandle[] handles, int ms, bool exitContext);
  74
  75                 static int WaitOneNative (SafeHandle waitableSafeHandle, uint millisecondsTimeout, bool hasThreadAffinity, bool exitContext)
  76                 {
  77 #if MONOTOUCH
  78                         if (exitContext)
  79                                 throw new NotSupportedException ("exitContext == true is not supported");
  80 #endif
  81
  82                         bool release = false;
  83                         try {
  84                                 if (exitContext)
  85                                         SynchronizationAttribute.ExitContext ();
  86
  87                                 waitableSafeHandle.DangerousAddRef (ref release);
  88
  89                                 return WaitOne_internal (waitableSafeHandle.DangerousGetHandle (), (int) millisecondsTimeout, exitContext);
  90                         } finally {
  91                                 if (release)
  92                                         waitableSafeHandle.DangerousRelease ();
  93
  94                                 if (exitContext)
  95                                         SynchronizationAttribute.EnterContext ();
  96                         }
  97                 }
  98
  99                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 100                 static extern int WaitOne_internal(IntPtr handle, int ms, bool exitContext);
 101
 102                 static int SignalAndWaitOne (SafeWaitHandle waitHandleToSignal,SafeWaitHandle waitHandleToWaitOn, int millisecondsTimeout, bool hasThreadAffinity,  bool exitContext)
 103                 {
 104                         bool releaseHandleToSignal = false, releaseHandleToWaitOn = false;
 105                         try {
 106                                 waitHandleToSignal.DangerousAddRef (ref releaseHandleToSignal);
 107                                 waitHandleToWaitOn.DangerousAddRef (ref releaseHandleToWaitOn);
 108
 109                                 return SignalAndWait_Internal (waitHandleToSignal.DangerousGetHandle (), waitHandleToWaitOn.DangerousGetHandle (), millisecondsTimeout, exitContext);
 110                         } finally {
 111                                 if (releaseHandleToSignal)
 112                                         waitHandleToSignal.DangerousRelease ();
 113                                 if (releaseHandleToWaitOn)
 114                                         waitHandleToWaitOn.DangerousRelease ();
 115                         }
 116                 }
 117
 118                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 119                 static extern int SignalAndWait_Internal (IntPtr toSignal, IntPtr toWaitOn, int ms, bool exitContext);
 120         }
 121 }