Working With Thread Local Storage (TLS) in C#

using System;
using System.Threading;
namespace ThreadLocalStorage
{
class akshay
{
public static void WriteError()
{
Console.WriteLine("Error number = " + Thread.GetData(Thread.GetNamedDataSlot("ErrNo")));
Console.WriteLine("Error source = " + Thread.GetData(Thread.GetNamedDataSlot("ErrSource"))
}
public static void SetError()
{
Random r = new Random();
Thread.SetData(Thread.GetNamedDataSlot("ErrNo"), r.Next(100));
Thread.SetData(Thread.GetNamedDataSlot("ErrSource"), Thread.CurrentThread.Name);
WriteError();
}
public static void Main()
{
Thread.AllocateNamedDataSlot("ErrNo");
Thread.AllocateNamedDataSlot("ErrSource");
Thread th2 = new Thread(new ThreadStart(SetError));
th2.Name = "t2";
th2.Start();
Thread th3 = new Thread(new ThreadStart(SetError));
th3.Name = "t3";
th3.Start();
Thread.FreeNamedDataSlot("ErrNo");
Thread.FreeNamedDataSlot("ErrSource");
Console.Read();
}
}
}

Output



We can create thread local storage in the managed environment. Depending on your application, it may be necessary for you to have a static field of a class that is unique for each thread that the class is used in. Doing so is trivially easy in the majority of the cases in C#. If you have a static field that must be thread relative, simply adorn it with the ThreadStaticAttribute attribute. Once you do that, the field will be initialized for each thread that accesses it. Under the covers, each thread is given its own thread relative location to save the value or reference. However, when using references to objects, be careful with your assumptions about the object's creation. The following code shows a pitfall to avoid.

using System;
using System.Threading;
namespace ThreadLocalStorage
{
public class TLS
{
public TLS()
{
Console.WriteLine("Creating TLS Class");
}
}
public class TLSFlied
{
[ThreadStatic]
public static TLS Tdata = new TLS();
}
public class EntryPoint
{
private static void ThreadFun()
{
Console.WriteLine("Thread {0} starting.....",Thread.CurrentThread.ManagedThreadId);
Console.WriteLine("TData for this thread is \"{0}\"",TLSFlied.Tdata);
Console.WriteLine("thread {0} exiting",Thread.CurrentThread.ManagedThreadId);
}
static void Main()
{
Thread t1 = new Thread(new ThreadStart(EntryPoint.ThreadFun));
Thread t2 = new Thread(new ThreadStart(EntryPoint.ThreadFun));
t1.Start();
t2.Start();
Console.Read();
}
}
}

Output

Resources

Thread- local storage of data in .NET
Use Thread Local Storage to Thread Specific Data
Storing Data in C#
Windows Azure - Local Storage Feature