Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / SharedStatics.cs / 1305376 / 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 System.Diagnostics.Contracts; #if FEATURE_CAS_POLICY using StringMaker = System.Security.Util.Tokenizer.StringMaker; #endif // FEATURE_CAS_POLICY 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. #if FEATURE_CAS_POLICY _maker = null; #endif // FEATURE_CAS_POLICY } private String _Remoting_Identity_IDGuid; public static String Remoting_Identity_IDGuid { [System.Security.SecuritySafeCritical] // auto-generated 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); } } Contract.Assert(_sharedStatics._Remoting_Identity_IDGuid != null, "_sharedStatics._Remoting_Identity_IDGuid != null"); return _sharedStatics._Remoting_Identity_IDGuid; } } #if FEATURE_CAS_POLICY private StringMaker _maker; [System.Security.SecuritySafeCritical] // auto-generated static public StringMaker GetSharedStringMaker() { StringMaker maker = null; bool tookLock = false; RuntimeHelpers.PrepareConstrainedRegions(); try { Monitor.Enter(_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; } [System.Security.SecuritySafeCritical] // auto-generated static public void ReleaseSharedStringMaker(ref StringMaker maker) { // save this stringmaker so someone else can use it bool tookLock = false; RuntimeHelpers.PrepareConstrainedRegions(); try { Monitor.Enter(_sharedStatics, ref tookLock); _sharedStatics._maker = maker; maker = null; } finally { if (tookLock) Monitor.Exit(_sharedStatics); } } #endif // FEATURE_CAS_POLICY // 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 { Contract.Assert(_sharedStatics._memFailPointReservedMemory >= 0, "Process-wide MemoryFailPoint reserved memory was negative!"); return (ulong) _sharedStatics._memFailPointReservedMemory; } } #if FEATURE_CORECLR // Silverlight2 implementation restriction (all hosts must specify the same PLATFORM_ASSEMBLIES list.) internal static bool ConflictsWithPriorPlatformList(String platformListString) { if (platformListString == null) { platformListString = ""; // null is valid but collides with _platformListString sentinel so convert to semantically equivalent "". } String prior = Interlocked.CompareExchange(ref _sharedStatics._platformListString, platformListString, null); if (prior == null) { return false; } if (prior == platformListString) { return false; } return true; } private String _platformListString; #endif //FEATURE_CORECLR } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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