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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.
**
**
=============================================================================*/
using System.Threading;
using System.Runtime.Remoting;
using System.Security;
using System.Runtime.CompilerServices;
using System.Runtime.ConstrainedExecution;
using System.Diagnostics;
using System.Diagnostics.Contracts;
namespace System
{
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.");
}
// 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;
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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