63 lines
2.1 KiB
C#
63 lines
2.1 KiB
C#
// ****************************************************************************
|
|
// 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 Microsoft 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;
|
|
}
|
|
}
|
|
}
|
|
}
|