47 lines
1.9 KiB
C#
47 lines
1.9 KiB
C#
//------------------------------------------------------------------------------
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// <copyright file="OdbcEnvironment.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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// <owner current="true" primary="true">[....]</owner>
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// <owner current="true" primary="false">[....]</owner>
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//------------------------------------------------------------------------------
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using System;
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using System.Data;
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using System.Data.Common;
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using System.Threading;
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namespace System.Data.Odbc {
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sealed internal class OdbcEnvironment {
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static private object _globalEnvironmentHandle;
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static private object _globalEnvironmentHandleLock = new object();
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private OdbcEnvironment () {} // default const.
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static internal OdbcEnvironmentHandle GetGlobalEnvironmentHandle() {
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OdbcEnvironmentHandle globalEnvironmentHandle = _globalEnvironmentHandle as OdbcEnvironmentHandle;
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if(null == globalEnvironmentHandle) {
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ADP.CheckVersionMDAC(true);
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lock(_globalEnvironmentHandleLock) {
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globalEnvironmentHandle = _globalEnvironmentHandle as OdbcEnvironmentHandle;
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if(null == globalEnvironmentHandle) {
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globalEnvironmentHandle = new OdbcEnvironmentHandle();
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_globalEnvironmentHandle = globalEnvironmentHandle;
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}
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}
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}
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return globalEnvironmentHandle;
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}
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static internal void ReleaseObjectPool() {
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object globalEnvironmentHandle = Interlocked.Exchange(ref _globalEnvironmentHandle, null);
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if(null != globalEnvironmentHandle) {
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(globalEnvironmentHandle as OdbcEnvironmentHandle).Dispose(); // internally refcounted so will happen correctly
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}
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}
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}
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}
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