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//
// System.Runtime.InteropServices.CriticalHandle
//
// Author:
// Kazuki Oikawa (kazuki@panicode.com)
//
#if NET_2_0
using System;
using System.Runtime.ConstrainedExecution;
using System.Runtime.Serialization;
namespace System.Runtime.InteropServices
{
public abstract class CriticalHandle : CriticalFinalizerObject, IDisposable
{
protected IntPtr handle;
bool _disposed = false;
protected CriticalHandle (IntPtr invalidHandleValue)
{
handle = invalidHandleValue;
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
~CriticalHandle ()
{
Dispose ();
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
public void Close ()
{
Dispose ();
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
public void Dispose ()
{
if (_disposed)
return;
_disposed = true;
if (IsInvalid)
return;
if (ReleaseHandle ()) {
GC.SuppressFinalize (this);
} else {
// Failed in release...
}
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
protected abstract bool ReleaseHandle ();
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
protected void SetHandle (IntPtr handle)
{
this.handle = handle;
}
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
public void SetHandleAsInvalid()
{
_disposed = true;
}
public bool IsClosed {
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
get { return _disposed; }
}
public abstract bool IsInvalid {
[ReliabilityContract (Consistency.WillNotCorruptState, Cer.Success)]
get;
}
}
}
#endif
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