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How to find out who owns ReaderWriterLockSlim?

I am writing an application that makes extensive use of multithreading. Some of the threads share an observable collection using ReaderWriterLockSlim.

I get a dead end from time to time, and I need to know which thread holds the lock at the time of the dead end. How can I know this? I looked at the properties of the object, and there was nothing obvious. Currently, all I know is which threads are waiting for a lock.

Thank you for your help!

EDIT: Of course, I'm talking about finding it during debugging with all the debugging information available.

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5 answers

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public class ReaderWriterLockSlimExtended : ReaderWriterLockSlim
{
    private Thread m_currentOwnerThread = null;
    private object m_syncRoot = new object();

    public Thread CurrentOwnerThread
    {
        get
        {
            lock (m_syncRoot)
            {
                return m_currentOwnerThread;
            }
        }
    }

    public Thread CurrentOwnerThreadUnsafe
    {
        get
        {
            return m_currentOwnerThread;
        }
    }

    public new void EnterWriteLock()
    {
        lock (m_syncRoot)
        {
            base.EnterWriteLock();
            m_currentOwnerThread = Thread.CurrentThread;
        }
        Debug.WriteLine("Enter Write Lock - Current Thread : {0} ({1})", CurrentOwnerThread.Name, CurrentOwnerThread.ManagedThreadId);
    }

    public new void ExitWriteLock()
    {
        Debug.WriteLine("Exit Write Lock - Current Thread : {0} ({1})", CurrentOwnerThread.Name, CurrentOwnerThread.ManagedThreadId);
        lock (m_syncRoot)
        {
            m_currentOwnerThread = null; //Must be null before exit!
            base.ExitWriteLock();
        }
    }  
}
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, , :

using System;
using System.Threading;

namespace Utils
{
public class ReaderWriterLockSlim2
{
    #region Attributes

    private readonly TimeSpan _maxWait;
    private readonly ReaderWriterLockSlim _lock;

    #endregion

    #region Properties

    public int CurrentWriteOwnerId { get; private set; }
    public string CurrentWriteOwnerName { get; private set; }

    #endregion

    #region Public Methods

    public ReaderWriterLockSlim2(LockRecursionPolicy policy, TimeSpan maxWait)
    {
        _maxWait = maxWait;
        _lock = new ReaderWriterLockSlim(policy);
    }

    public void EnterWriteLock()
    {
        if (!_lock.TryEnterWriteLock(_maxWait))
        {
            throw new TimeoutException(string.Format("Timeout while waiting to enter a WriteLock. Lock adquired by Id {0} - Name {1}", this.CurrentWriteOwnerId, this.CurrentWriteOwnerName));
        }
        else
        {
            this.CurrentWriteOwnerId = Thread.CurrentThread.ManagedThreadId;
            this.CurrentWriteOwnerName = Thread.CurrentThread.Name; 
        }
    }

    public void ExitWriteLock()
    {
        _lock.ExitWriteLock();
        this.CurrentWriteOwnerId = 0;
        this.CurrentWriteOwnerName = null;  
    }

    public void EnterReadLock()
    {
        _lock.EnterReadLock();
    }

    public void ExitReadLock()
    {
        _lock.ExitReadLock();
    }

    #endregion
}
}
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