SharedStatics.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / SharedStatics.cs / 1 / SharedStatics.cs
                        

                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*==============================================================================
** 
** Class: SharedStatics 
**
** 
** 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 StringMaker = System.Security.Util.Tokenizer.StringMaker;
 
    internal sealed class SharedStatics 
    {
        // this is declared static but is actually forced to be the same object 
        // for each AppDomain at AppDomain create time.
        internal static SharedStatics _sharedStatics;

        // when we create the single object we can construct anything we will need 
        // here. If not too many, then just create them all in the constructor, otherwise
        // can have the property check & create. Need to be aware of threading issues 
        // when do so though. 
        // Note: This ctor is not called when we setup _sharedStatics via AppDomain::SetupSharedStatics
        SharedStatics() { 
            _Remoting_Identity_IDGuid = null;
            _Remoting_Identity_IDSeqNum = 0x40; // Reserve initial numbers for well known objects.
            _maker = null;
        } 

        private String _Remoting_Identity_IDGuid; 
        public static String Remoting_Identity_IDGuid 
        {
            get 
            {
                if (_sharedStatics._Remoting_Identity_IDGuid == null)
                {
                    bool tookLock = false; 
                    RuntimeHelpers.PrepareConstrainedRegions();
                    try { 
                        Monitor.ReliableEnter(_sharedStatics, ref tookLock); 

                        if (_sharedStatics._Remoting_Identity_IDGuid == null) 
                        {
                            _sharedStatics._Remoting_Identity_IDGuid = Guid.NewGuid().ToString().Replace('-', '_');
                        }
                    } 
                    finally {
                        if (tookLock) 
                            Monitor.Exit(_sharedStatics); 
                    }
                } 

                BCLDebug.Assert(_sharedStatics._Remoting_Identity_IDGuid != null,
                                "_sharedStatics._Remoting_Identity_IDGuid != null");
                return _sharedStatics._Remoting_Identity_IDGuid; 
            }
        } 
 
        private StringMaker _maker;
        static public StringMaker GetSharedStringMaker() 
        {
            StringMaker maker = null;

            bool tookLock = false; 
            RuntimeHelpers.PrepareConstrainedRegions();
            try { 
                Monitor.ReliableEnter(_sharedStatics, ref tookLock); 

                if (_sharedStatics._maker != null) 
                {
                    maker = _sharedStatics._maker;
                    _sharedStatics._maker = null;
                } 
            }
            finally { 
                if (tookLock) 
                    Monitor.Exit(_sharedStatics);
            } 

            if (maker == null)
            {
                maker = new StringMaker(); 
            }
 
            return maker; 
        }
 
        static public void ReleaseSharedStringMaker(ref StringMaker maker)
        {
            // save this stringmaker so someone else can use it
            bool tookLock = false; 
            RuntimeHelpers.PrepareConstrainedRegions();
            try 
            { 
                Monitor.ReliableEnter(_sharedStatics, ref tookLock);
 
                _sharedStatics._maker = maker;
                maker = null;
            }
            finally { 
                if (tookLock)
                    Monitor.Exit(_sharedStatics); 
            } 
        }
 
        // 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 { 
                BCLDebug.Assert(_sharedStatics._memFailPointReservedMemory >= 0, "Process-wide MemoryFailPoint reserved memory was negative!");
                return (ulong) _sharedStatics._memFailPointReservedMemory; 
            } 
        }
    } 
}

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