Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / Util / SafeBitVector32.cs / 1 / SafeBitVector32.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- using System; using System.Threading; namespace System.Web.Util { // // This is a multithreadsafe version of System.Collections.Specialized.BitVector32. // [Serializable] internal struct SafeBitVector32 { private volatile int _data; internal SafeBitVector32(int data) { this._data = data; } #if UNUSED_CODE internal int IntegerValue { get { return _data; } set { #pragma warning disable 0420 Interlocked.Exchange(ref _data, value); #pragma warning restore 0420 } } #endif internal bool this[int bit] { get { int data = _data; return (data & bit) == bit; } set { for (;;) { int oldData = _data; int newData; if (value) { newData = oldData | bit; } else { newData = oldData & ~bit; } #pragma warning disable 0420 int result = Interlocked.CompareExchange(ref _data, newData, oldData); #pragma warning restore 0420 if (result == oldData) { break; } } } } internal bool ChangeValue(int bit, bool value) { for (;;) { int oldData = _data; int newData; if (value) { newData = oldData | bit; } else { newData = oldData & ~bit; } if (oldData == newData) { return false; } #pragma warning disable 0420 int result = Interlocked.CompareExchange(ref _data, newData, oldData); #pragma warning restore 0420 if (result == oldData) { return true; } } } } }
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