mcs/class/referencesource/mscorlib/microsoft/win32/safehandles/safewaithandle.cs

   1 // ==++==
   2 //
   3 //   Copyright (c) Microsoft Corporation.  All rights reserved.
   4 //
   5 // ==--==
   6 /*============================================================
   7 **
   8 ** Class:  SafeWaitHandle
   9 **
  10 **
  11 ** A wrapper for Win32 events (mutexes, auto reset events, and
  12 ** manual reset events).  Used by WaitHandle.
  13 **
  14 **
  15 ===========================================================*/
  16
  17 using System;
  18 using System.Security;
  19 using System.Security.Permissions;
  20 using System.Runtime.InteropServices;
  21 using System.Runtime.CompilerServices;
  22 using System.Runtime.ConstrainedExecution;
  23 using System.Runtime.Versioning;
  24 using Microsoft.Win32;
  25 using System.Threading;
  26
  27 namespace Microsoft.Win32.SafeHandles {
  28
  29     [System.Security.SecurityCritical]  // auto-generated_required
  30     public sealed class SafeWaitHandle : SafeHandleZeroOrMinusOneIsInvalid
  31     {
  32         // Called by P/Invoke marshaler
  33         private SafeWaitHandle() : base(true)
  34         {
  35         }
  36
  37         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.MayFail)]
  38         public SafeWaitHandle(IntPtr existingHandle, bool ownsHandle) : base(ownsHandle)
  39         {
  40             SetHandle(existingHandle);
  41         }
  42
  43         [System.Security.SecurityCritical]
  44         [ResourceExposure(ResourceScope.Machine)]
  45         [ResourceConsumption(ResourceScope.Machine)]
  46         override protected bool ReleaseHandle()
  47         {
  48 #if MONO
  49             NativeEventCalls.CloseEvent_internal (handle);
  50             return true;
  51 #else
  52             return Win32Native.CloseHandle(handle);
  53 #endif
  54         }
  55     }
  56 }