ExecutorLocksHeldException.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 / cdf / src / WF / RunTime / ExecutorLocksHeldException.cs / 1305376 / ExecutorLocksHeldException.cs
                        

                        
                            // **************************************************************************** 
// Copyright (C) 2000-2001 Microsoft Corporation.  All rights reserved.
//
// CONTENTS
//     Workflow Base exception class 
//
// DESCRIPTION 
//     Base class for WINOE Runtime engine exception 
//
// REVISIONS 
// Date          Ver     By           Remarks
// ~~~~~~~~~~    ~~~     ~~~~~~~~     ~~~~~~~~~~~~~~
// 03/08/01      1.0     [....]       Created.
// *************************************************************************** 
using System;
using System.Runtime.Serialization; 
using System.Security.Permissions; 
using System.Collections.Generic;
using System.Globalization; 
using System.Threading;
using System.Workflow;
using System.Workflow.Runtime;
using System.Workflow.ComponentModel; 

namespace System.Workflow.Runtime 
{ 
    /*
     * The Unload() method has been changed so that 
     * any Unload requests made while in the middle of an atomic
     * transaction wait for the atomic transaction to complete.
     * This makes use of an ManualResetEvent. Unload() waits on the event:
     *      theEvent.WaitOne() 
     * But waiting with the executor and scheduler locks held
     * will block everything else. 
     * 
     * The solution is to have a custom internal exception class that has the
     * ManualResetEvent as an internal property. If Unload() finds itself in the middle 
     * of an atomic transaction, it throws the Exception. The Exception is propogated upwards
     * until we reach the method that was the first to grab the executor lock.
     *
     * We then drop that lock and wait on the event handle. As soon as the handle is 
     * Set() by DisposeTransaction(), we grab the executor lock and do everything all over.
     */ 
 
    internal class ExecutorLocksHeldException : Exception
    { 
        private ManualResetEvent handle;

        public ExecutorLocksHeldException(ManualResetEvent handle)
        { 
            this.handle = handle;
        } 
 
        internal ManualResetEvent Handle
        { 
            get
            {
                return handle;
            } 
        }
    } 
} 

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

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