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using System;
using System.Diagnostics;
using System.Threading;
namespace Pfz.Threading
{
/// <summary>
/// Class returned by ReaderWriterLockExtensions when acquiring an
/// upgradeable lock.
/// </summary>
public sealed class UpgradeableLockDisposer:
IDisposable
{
#region Fields
internal ReaderWriterLockSlim _readerWriterLock;
#if DEBUG
private Thread _thread;
private StackTrace _stackTrace;
#endif
#endregion
#region Constructor
internal UpgradeableLockDisposer(ReaderWriterLockSlim readerWriterLock, int timeout)
{
#if DEBUG
GC.SuppressFinalize(this);
_thread = Thread.CurrentThread;
_stackTrace = new StackTrace(true);
GC.ReRegisterForFinalize(this);
#endif
_readerWriterLock = readerWriterLock;
if (!readerWriterLock.TryEnterUpgradeableReadLock(timeout))
{
GC.SuppressFinalize(this);
_readerWriterLock = null;
}
}
#endregion
#region Destructor
/// <summary>
/// Throws an exception, as we can simple release the lock (destructors runs from another thread).
/// </summary>
~UpgradeableLockDisposer()
{
LockConfiguration._ThrowLockDisposerException("UpgradeableLock");
}
#endregion
#region Dispose
/// <summary>
/// Releases the lock if it is still hold.
/// </summary>
public void Dispose()
{
ReaderWriterLockSlim lockObject = _readerWriterLock;
if (lockObject != null)
{
lockObject.ExitUpgradeableReadLock();
_readerWriterLock = null;
GC.SuppressFinalize(this);
}
}
#endregion
#region SwitchLock
/// <summary>
/// First locks the new object and then releases the old lock.
/// This is NOT abort-safe.
/// </summary>
public void SwitchLock(ReaderWriterLockSlim newReaderWriterLock)
{
if (newReaderWriterLock == null)
throw new ArgumentNullException("newReaderWriterLock");
newReaderWriterLock.EnterUpgradeableReadLock();
_readerWriterLock.ExitUpgradeableReadLock();
_readerWriterLock = newReaderWriterLock;
}
#endregion
}
}
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I started to program computers when I was 11 years old, as a hobbyist, programming in AMOS Basic and Blitz Basic for Amiga.
At 12 I had my first try with assembler, but it was too difficult at the time. Then, in the same year, I learned C and, after learning C, I was finally able to learn assembler (for Motorola 680x0).
Not sure, but probably between 12 and 13, I started to learn C++. I always programmed "in an object oriented way", but using function pointers instead of virtual methods.
At 15 I started to learn Pascal at school and to use Delphi. At 16 I started my first internship (using Delphi). At 18 I started to work professionally using C++ and since then I've developed my programming skills as a professional developer in C++ and C#, generally creating libraries that help other developers do their work easier, faster and with less errors.
Want more info or simply want to contact me?
Take a look at:
http://paulozemek.azurewebsites.net/
Or e-mail me at: paulozemek@outlook.com
Codeproject MVP 2012, 2015 & 2016
Microsoft MVP 2013-2014 (in October 2014 I started working at Microsoft, so I can't be a Microsoft MVP anymore).