SafeBitVector32.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / Util / SafeBitVector32.cs / 1305376 / 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; 
        }

        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; 
                } 
            }
        } 
    }
}


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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