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Posted 17 Jan 2006

Synchronizing Multiple Threads in the ThreadPool

, 17 Jan 2006
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An article on thread synchronization and usage of ThreadPool
Sample Image - PoolSynchronization.jpg


This snippet demonstrates one way of synchronizing multiple user worker threads by means of ManualResetEvents. I came across the question wherein you might have a number of computational threads and each thread has a number of computational stages. The constraint was that none of the threads can proceed to the next stage 'n+1' unless all threads completed stage 'n'.


ThreadPool is beneficial in cases when the threads are not highly CPU intensive and are not prioritized. By using the thread pool, you save valuable resources on the actual thread creation.

Using the Code

The project consists of three main objects:

  • The GUI frmSwitchBoard
  • The synchronizing object CPoolSynchronizer
  • The object CComputeItem containing compute functions 'func'

From the GUI, you can control how many compute threads you wish to place in the ThreadPool.

You might also find it useful how to interact with WinForm controls asynchronously. CComputeItems update the progress independently from each other by calling Invoke() on the control.


  • 17th January, 2006 - Initial version submitted


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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