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Upcoming Presentations

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User Group’s Web Site New web site for the user group. Bunch of new features List of latest news and events Details of upcoming presentations Code Zone – code download area Presentations submitted by the user group’s members Threaded discussion lists. The more you use it, the better it gets  Volunteers needed to provide content. Send email to farhan@ilmlearning.com

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Attend Get.NET! For Free Drawing for a free Get.NET! seminar Remember to turn-in your evaluation form Drawing will be conducted after the presentation One lucky person will walk away with free registration to the Get.NET! seminar on March 6th Everyone else gets a 25% discount by using the coupon code “tcnug” during registration

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Multi Threading What is multi threaded programming Allows you to run several sections of your code simultaneously On a single CPU machine Operating system balances the use of processor among all threads Operating system simulates parallel processing by constantly switching between threads

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Multi Threading When to use multi threading ? When you need to quickly respond to users’ interactions You can leverage .NET Remoting or ASP.NET web service to distribute processing load to multiple computers Consider multi threading when you need to process several independent transactions

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Multi Threading Meet Minne-500 Simple car racing game. An old car “Oldie” races with a new car “newbie” Shows multi-threaded programming Change thread priorities and watch its effect

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Multi Threading Considerations while using multiple threads Creates memory overhead because the context for each thread needs to be saved separately Creates more work for the processor because it needs to switch frequently between multiple threads of execution Can slow down your application if operated in a single processor environment Multi threading works best in parallel processor systems, or in a distributed computing environment

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Multi Threading Creating threads Using ThreadPool class Contained inside System.Threading namespace Only contains static methods By default, contains a pool of 25 threads Processing can not be aborted after its started Can not set priority on the thread Use “QueueUserWorkItem” method to start parallel processing “QueueUserWorkItem” receives a “WaitCallBack” delegate. “WaitCallBack” delegate receives an object as a parameter, which can be used to pass state info.

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Multi Threading Creating threads Creating custom threads Threads are created by instantiating Thread class Contained in System.Threading namespace Complete control over prioritizing, aborting threads. Thread class receives a “ThreadStart” delegate as a parameter to the constructor “ThreadStart” delegate does not receive any parameter and does not return any value

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Multi Threading Starting a thread Use the Start method of the Thread class to start its execution Stopping a thread Use the Abort method of the Thread class to stop its execution Handling thread abortion When a thread is aborted, .NET runtime throws “ThreadAbortException” This exception can be handled to perform any necessary cleanup

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Multi Threading Suspending a thread Use the “Suspend” method of the Thread class to halt its execution. Its like pushing the pause button on VCR. Resuming a thread Use the “Resume method of the Thread to resume its execution. Sleeping a thread Use the static method “Sleep” of the Thread class to cause the thread to become dormant for a specified period of time.

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Multi Threading Waiting for another thread Use the “Join” method of the Thread class to specify that you intend to wait for another thread to finish running. Synchronizing threads Meet the “Thread Pull”, designed to simulate multiple threads working together Use Interlocked class for simple increment and decrement operations Use “lock” keyword to synchronize access to a code block. This keyword will cause all threads accessing the code block to queue up and execute in a sequence

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Multi Threading Synchronizing threads Using Monitor Use the “Wait” method of the Monitor class to suspend a thread until another event occurs in the system. Use the “Pulse” or “PulseAll” method of the Monitor class to activate thread(s) sitting in wait mode.