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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*=============================================================================
**
**
**
** Purpose: Container for statics that are shared across AppDomains.
**
**
=============================================================================*/
namespace System
{
using System.Threading;
using System.Runtime.Remoting;
using System.Security;
using System.Security.Util;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
using System.Diagnostics;
using System.Diagnostics.Contracts;
internal sealed class SharedStatics
{
// this is declared static but is actually forced to be the same object
// for each AppDomain at AppDomain create time.
private static SharedStatics _sharedStatics;
// Note: Do not add any code in this ctor because it is not called
// when we set up _sharedStatics via AppDomain::SetupSharedStatics
private SharedStatics()
{
BCLDebug.Assert(false, "SharedStatics..ctor() is never called.");
}
private volatile String _Remoting_Identity_IDGuid;
public static String Remoting_Identity_IDGuid
{
get
{
if (_sharedStatics._Remoting_Identity_IDGuid == null)
{
bool tookLock = false;
RuntimeHelpers.PrepareConstrainedRegions();
try {
Monitor.Enter(_sharedStatics, ref tookLock);
if (_sharedStatics._Remoting_Identity_IDGuid == null)
{
_sharedStatics._Remoting_Identity_IDGuid = Guid.NewGuid().ToString().Replace('-', '_');
}
}
finally {
if (tookLock)
Monitor.Exit(_sharedStatics);
}
}
Debug.Assert(_sharedStatics._Remoting_Identity_IDGuid != null,
"_sharedStatics._Remoting_Identity_IDGuid != null");
return _sharedStatics._Remoting_Identity_IDGuid;
}
}
// Note this may not need to be process-wide.
private int _Remoting_Identity_IDSeqNum;
internal static int Remoting_Identity_GetNextSeqNum()
{
return Interlocked.Increment(ref _sharedStatics._Remoting_Identity_IDSeqNum);
}
// This is the total amount of memory currently "reserved" via
// all MemoryFailPoints allocated within the process.
// Stored as a long because we need to use Interlocked.Add.
private long _memFailPointReservedMemory;
[ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
internal static long AddMemoryFailPointReservation(long size)
{
// Size can legitimately be negative - see Dispose.
return Interlocked.Add(ref _sharedStatics._memFailPointReservedMemory, (long) size);
}
internal static ulong MemoryFailPointReservedMemory {
get {
Debug.Assert(Volatile.Read(ref _sharedStatics._memFailPointReservedMemory) >= 0, "Process-wide MemoryFailPoint reserved memory was negative!");
return (ulong) Volatile.Read(ref _sharedStatics._memFailPointReservedMemory);
}
}
}
}
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