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Concurrent Affairs: The ReaderWriterGate Lock

Posted By:      Posted Date: August 21, 2010    Points: 0   Category :ASP.Net

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Concurrent Affairs: Build a Richer Thread Synchronization Lock


In my last column, I showed the various thread synchronization mechanisms employed by the Microsoft® . NET Framework (see Concurrent Affairs: Performance-Conscious Thread Synchronization). I then examined the performance characteristics of all these mechanisms and determined that the Interlocked methods performed the best because the calling thread never has to transition to kernel mode.

Jeffrey Richter

MSDN Magazine March 2006

Concurrent Affairs: Data-Parallel Patterns and PLINQ


Multicore processors are now ubiquitous on mainstream desktop computers, but applications that use their full potential are still difficult to write. Version 4 of the .NET Framework will deliver several tools that programmers can employ to make this task easier. This article explores the use of one of those tools: Parallel LINQ (PLINQ).

Igor Ostrovsky

MSDN Magazine December 2009

Concurrent Affairs: Four Ways to Use the Concurrency Runtime in Your C++ Projects


This article describes how to integrate the new parallel computing libraries in the Visual Studio 2010 Beta into existing C++ projects. Based on four common scenarios, the column explains a few of the ways developers can use the APIs and classes that are part of the Parallel Pattern Library (PPL), Asynchronous Agents Library, and Concurrency Runtime.

Rick Molloy

MSDN Magazine October 2009

Concurrent Affairs: Solving The Dining Philosophers Problem With Asynchronous Agents


We use the new Asynchronous Agents Library in Visual C++ 2010 to solve the classic Dining Philosophers concurrency problem.

Rick Molloy

MSDN Magazine June 2009

Concurrent Affairs: More AsyncEnumerator Features


Jeffrey Richter shows you some additional cool features of his AsyncEnumerator class.

Jeffrey Richter

MSDN Magazine August 2008

Concurrent Affairs: Simplified APM with the AsyncEnumerator


Here Jeffrey Richter introduces his AsyncEnumerator class, which drives an iterator so that different thread pool threads can execute the same code at different times.

Jeffrey Richter

MSDN Magazine June 2008

Concurrent Affairs: Simplified APM with C#


Jeffrey Richter introduces his AsyncEnumerator class and explains how it harnesses some recent additions to the C# programming language that make working with the asynchronous programming model significantly easier.

Jeffrey Richter

MSDN Magazine November 2007

Concurrent Affairs: Asynchronous Device Operations


Jeff Richter uses the AsyncResult class to implement the CLR's Asynchronous Programming Model to perform hardware device operations asynchronously.

Jeffrey Richter

MSDN Magazine June 2007

Concurrent Affairs: Concurrency and Coordination Runtime


What can a robot-programming toolkit do for you? Read on and find out.

Jeffrey Richter

MSDN Magazine September 2006

Concurrent Affairs: Reader/Writer Locks and the ResourceLock Library


If multiple threads concurrently execute code that writes to or modifies a resource, then obviously the resource must be protected with a thread synchronization lock to ensure that the resource doesn't get corrupted.

Jeffrey Richter

MSDN Magazine June 2006

Concurrent Affairs: Performance-Conscious Thread Synchronization


In my career, I have architected and implemented many thread synchronization techniques. This has provided me with a lot of experience that has shaped the way I now think about thread synchronization problems.

Jeffrey Richter

MSDN Magazine October 2005

Easy Async: Build Concurrent Apps From Simple F# Expressions


In this article, the author explores how the F# language helps you create asynchronous function libraries that can be called seamlessly from any other .NET-compliant language.

Chance Coble

MSDN Magazine October 2008

Memory Models: Understand the Impact of Low-Lock Techniques in Multithreaded Apps


Because the use of low-lock techniques in your application significantly increases the likelihood of introducing hard-to-find bugs, it is best to use them only when absolutely necessary. Here Vance Morrison demonstrates the limitations and subtleties low-lock techniques so that if you are forced to use them you have a better chance of using them correctly.

Vance Morrison

MSDN Magazine October 2005

C++ Q&A: Performance Monitoring, Managed Extensions, and Lock Toolbars


In the June 2004 issue of MSDN®Magazine, I described a class called ShowTime that you can use to do simple performance monitoring for your app. ShowTime uses its constructor/destructor to record the start/stop times of its existence so you can instantiate it in a block of code like so: { ShowTime st(_T("Total time is:")); // some lengthy operation } .

Paul DiLascia

MSDN Magazine September 2004

Multiprocessor Optimizations: Fine-Tuning Concurrent Access to Large Data Collections


Application performance involves more than just speed. In a Web server environment, top performance also means ensuring that the maximum numbers of users can be served concurrently. This can be accomplished through efficient use of multiprocessor machines and thread management. This article presents techniques that can solve a number of concurrency problems. One approach, using thread management, controls access to a database on a per-thread basis, which protects the integrity of the data. In the article, reusable thread classes are built and presented. The classes are then tested and their performance in a live environment is examined.

Ian Emmons

MSDN Magazine August 2001

Prevent Concurrent Logins ? [ Already logged in or currest session is still active implementation] ?


Hi Experts ,

I searched over the web but no luck so far and thought of getting some help form gurus .

Did any out really implemented a way to handle concurrent logins ?

Please not that i'm no using either forms authentication or Roles/Memberships , I do have custom authentication for my website .

I'm sure it is someway related  with global.asax file handling something in application events and session events but unable to figure this one out .

Any pointers will highly be valued and appreciated .

Thanks a tonne in advance .

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