OdbcEnvironment.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 / Data / System / Data / Odbc / OdbcEnvironment.cs / 1305376 / OdbcEnvironment.cs

                            //------------------------------------------------------------------------------ 
// 
//      Copyright (c) Microsoft Corporation.  All rights reserved.
// 
// [....] 
// [....]
//----------------------------------------------------------------------------- 
 
using System;
using System.Data; 
using System.Data.Common;
using System.Threading;

 
namespace System.Data.Odbc {
    sealed internal class OdbcEnvironment { 
        static private object _globalEnvironmentHandle; 
        static private object _globalEnvironmentHandleLock = new object();
 
        private OdbcEnvironment () {}  // default const.

        static internal OdbcEnvironmentHandle GetGlobalEnvironmentHandle() {
            OdbcEnvironmentHandle globalEnvironmentHandle = _globalEnvironmentHandle as OdbcEnvironmentHandle; 
            if(null == globalEnvironmentHandle) {
                ADP.CheckVersionMDAC(true); 
 
                lock(_globalEnvironmentHandleLock) {
                    globalEnvironmentHandle = _globalEnvironmentHandle as OdbcEnvironmentHandle; 
                    if(null == globalEnvironmentHandle) {
                        globalEnvironmentHandle = new OdbcEnvironmentHandle();
                        _globalEnvironmentHandle = globalEnvironmentHandle;
                    } 
                }
            } 
            return globalEnvironmentHandle; 
        }
 
        static internal void ReleaseObjectPool() {
            object globalEnvironmentHandle = Interlocked.Exchange(ref _globalEnvironmentHandle, null);
            if(null != globalEnvironmentHandle) {
                (globalEnvironmentHandle as OdbcEnvironmentHandle).Dispose(); // internally refcounted so will happen correctly 
            }
        } 
    } 
}
 

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

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