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                         int release_last = -1;
  56
  57                         try {
  58                                 if (exitContext)
  59                                         SynchronizationAttribute.ExitContext ();
  60
  61                                 for (int i = 0; i < waitHandles.Length; ++i) {
  62                                         try {
  63                                         } finally {
  64                                                 /* we have to put it in a finally block, to avoid having a ThreadAbortException
  65                                                  * between the return from DangerousAddRef and the assignement to release_last */
  66                                                 bool release = false;
  67                                                 waitHandles [i].SafeWaitHandle.DangerousAddRef (ref release);
  68                                                 release_last = i;
  69                                         }
  70                                 }
  71
  72                                 if (WaitAll)
  73                                         return WaitAll_internal (waitHandles, millisecondsTimeout, exitContext);
  74                                 else
  75                                         return WaitAny_internal (waitHandles, millisecondsTimeout, exitContext);
  76                         } finally {
  77                                 for (int i = release_last; i >= 0; --i) {
  78                                         waitHandles [i].SafeWaitHandle.DangerousRelease ();
  79                                 }
  80
  81                                 if (exitContext)
  82                                         SynchronizationAttribute.EnterContext ();
  83                         }
  84                 }
  85
  86                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  87                 private static extern int WaitAll_internal(WaitHandle[] handles, int ms, bool exitContext);
  88
  89                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
  90                 private static extern int WaitAny_internal(WaitHandle[] handles, int ms, bool exitContext);
  91
  92                 static int WaitOneNative (SafeHandle waitableSafeHandle, uint millisecondsTimeout, bool hasThreadAffinity, bool exitContext)
  93                 {
  94 #if MONOTOUCH
  95                         if (exitContext)
  96                                 throw new NotSupportedException ("exitContext == true is not supported");
  97 #endif
  98
  99                         bool release = false;
 100                         try {
 101                                 if (exitContext)
 102                                         SynchronizationAttribute.ExitContext ();
 103
 104                                 waitableSafeHandle.DangerousAddRef (ref release);
 105
 106                                 return WaitOne_internal (waitableSafeHandle.DangerousGetHandle (), (int) millisecondsTimeout, exitContext);
 107                         } finally {
 108                                 if (release)
 109                                         waitableSafeHandle.DangerousRelease ();
 110
 111                                 if (exitContext)
 112                                         SynchronizationAttribute.EnterContext ();
 113                         }
 114                 }
 115
 116                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 117                 static extern int WaitOne_internal(IntPtr handle, int ms, bool exitContext);
 118
 119                 static int SignalAndWaitOne (SafeWaitHandle waitHandleToSignal,SafeWaitHandle waitHandleToWaitOn, int millisecondsTimeout, bool hasThreadAffinity,  bool exitContext)
 120                 {
 121                         bool releaseHandleToSignal = false, releaseHandleToWaitOn = false;
 122                         try {
 123                                 waitHandleToSignal.DangerousAddRef (ref releaseHandleToSignal);
 124                                 waitHandleToWaitOn.DangerousAddRef (ref releaseHandleToWaitOn);
 125
 126                                 return SignalAndWait_Internal (waitHandleToSignal.DangerousGetHandle (), waitHandleToWaitOn.DangerousGetHandle (), millisecondsTimeout, exitContext);
 127                         } finally {
 128                                 if (releaseHandleToSignal)
 129                                         waitHandleToSignal.DangerousRelease ();
 130                                 if (releaseHandleToWaitOn)
 131                                         waitHandleToWaitOn.DangerousRelease ();
 132                         }
 133                 }
 134
 135                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 136                 static extern int SignalAndWait_Internal (IntPtr toSignal, IntPtr toWaitOn, int ms, bool exitContext);
 137         }
 138 }