HandleTable.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 / tx / System / Transactions / Oletx / HandleTable.cs / 1305376 / HandleTable.cs

                            using System; 
using System.Collections.Generic;
using System.Diagnostics;
using System.Threading;
using System.Transactions.Diagnostics; 

namespace System.Transactions.Oletx 
{ 
    static class HandleTable
    { 
        private static Dictionary handleTable = new Dictionary(256);
        private static object syncRoot = new object();
        private static int currentHandle;
 
        public static IntPtr AllocHandle(object target)
        { 
            lock(syncRoot) 
            {
                int handle = FindAvailableHandle(); 
                handleTable.Add(handle, target);

                return new IntPtr(handle);
            } 
        }
 
        public static bool FreeHandle(IntPtr handle) 
        {
            Debug.Assert(handle != IntPtr.Zero, "handle is invalid"); 
            lock(syncRoot)
            {
                return handleTable.Remove(handle.ToInt32());
            } 
        }
 
        public static object FindHandle(IntPtr handle) 
        {
            Debug.Assert(handle != IntPtr.Zero, "handle is invalid"); 
            lock(syncRoot)
            {
                object target;
                if (!handleTable.TryGetValue(handle.ToInt32(), out target)) 
                {
                    return null; 
                } 

                return target; 
            }
        }

        private static int FindAvailableHandle() 
        {
            int handle = 0; 
            do 
            {
                handle = (++currentHandle != 0) ? currentHandle : ++currentHandle; 
            } while(handleTable.ContainsKey(handle));

            Debug.Assert(handle != 0, "invalid handle selected");
            return handle; 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
                        

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