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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
/*=============================================================================
**
**
** Purpose: Interface meant for CLR to participate in framework rundown.
** AppDomainPauseManager is the class that encapsulates all Fx rundown work.
**
**
=============================================================================*/
namespace System
{
using System;
using System.Threading;
using System.Security;
using System.Diagnostics.Contracts;
using System.Runtime.Versioning;
using System.Runtime.CompilerServices;
[System.Security.SecurityCritical]
internal class AppDomainPauseManager
{
[System.Security.SecurityCritical]
public AppDomainPauseManager()
{
isPaused = false;
}
[System.Security.SecurityCritical]
static AppDomainPauseManager()
{
}
static readonly AppDomainPauseManager instance = new AppDomainPauseManager();
internal static AppDomainPauseManager Instance
{
[System.Security.SecurityCritical]
get { return instance; }
}
// FAS: IAppDomainPauseConsumer interface implementation
// currently there is nothing we do here as the implementation
// of updating pause times have been moved to native CorHost2
[System.Security.SecurityCritical]
public void Pausing()
{
}
[System.Security.SecurityCritical]
public void Paused()
{
Contract.Assert(!isPaused);
if(ResumeEvent == null)
ResumeEvent = new ManualResetEvent(false);
else
ResumeEvent.Reset();
Timer.Pause();
// Set IsPaused at the last as other threads seeing it set, will expect a valid
// reset ResumeEvent. Also the requirement here is that only after Paused
// returns other threads should block on this event. So there is a race condition here.
isPaused = true;
}
[System.Security.SecurityCritical]
public void Resuming()
{
Contract.Assert(isPaused);
isPaused = false;
ResumeEvent.Set();
}
[System.Security.SecurityCritical]
public void Resumed()
{
Timer.Resume();
}
private static volatile bool isPaused;
internal static bool IsPaused
{
[System.Security.SecurityCritical]
get { return isPaused; }
}
internal static ManualResetEvent ResumeEvent
{
[System.Security.SecurityCritical]
get;
[System.Security.SecurityCritical]
set;
}
}
}
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