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/*
KeePass Password Safe - The Open-Source Password Manager
Copyright (C) 2003-2025 Dominik Reichl <dominik.reichl@t-online.de>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Text;
using System.Threading;
namespace KeePass.Util
{
/// <summary>
/// Mechanism to synchronize access to an object.
/// In addition to a usual critical section (which locks an object
/// to a single thread), <c>CriticalSectionEx</c> also prevents
/// subsequent accesses from the same thread.
/// </summary>
public sealed class CriticalSectionEx
{
private int m_iLock = 0;
#if (DEBUG && !KeePassUAP)
private int m_iThreadId = -1;
#endif
public CriticalSectionEx() { }
#if DEBUG
~CriticalSectionEx()
{
// The object should be unlocked when the lock is disposed
Debug.Assert(Interlocked.CompareExchange(ref m_iLock, 0, 2) == 0);
}
#endif
public bool TryEnter()
{
bool b = (Interlocked.Exchange(ref m_iLock, 1) == 0);
#if (DEBUG && !KeePassUAP)
if(b) m_iThreadId = Thread.CurrentThread.ManagedThreadId;
#endif
return b;
}
public void Exit()
{
if(Interlocked.Exchange(ref m_iLock, 0) != 1)
{
Debug.Assert(false);
}
#if (DEBUG && !KeePassUAP)
else
{
// Lock should be released by the original thread
Debug.Assert(Thread.CurrentThread.ManagedThreadId == m_iThreadId);
m_iThreadId = -1;
}
#endif
}
}
}
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