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Tested on several platforms (Linux, BSD, Mac OS X, etc.). To request that a work item be handled by a thread in the thread pool, call the QueueUserWorkItem method. A queue of structs that hold job descriptions is easy to implement. I wrote a simple thread pool, which works pretty well. Work is simply a function. Thread Pool in C#: Thread pool in C# is nothing but a collection of threads that can be reused to perform no of tasks in the background. This method takes as a parameter a reference to the method or delegate that will be called by the thread selected from the thread pool. You need to protect access of the queue by multiple threads and be able to know when the queue is empty (and pause pool threads) and full (if needed). One important feature that I needed in the pool is the ability to wait until all the tasks that I sent to the pool are complete (so that later I could send other tasks that are dependent on the result of the previous tasks). When the task queue is empty, the thread blocks and waits for new tasks to be added. thpool_add_work(thpool, (void*)function_p, (void*)arg_p) Will add new work to the pool. I … In computer programming, a thread pool is a software design pattern for achieving concurrency of execution in a computer program. You can pass a single argument to the function if you wish. Generally speaking, the thread pool has a task queue and a thread queue. Accessing a global variable in a thread is generally a bad idea. Now when a request comes, then it directly goes to the thread pool and checks whether there are any free threads available or not. threadpool-a simple thread pool based on pthread Introduction to Thread Pool Thread pool can be said to be a component that is often used in projects. Using a thread pool immediately alleviates from the ails of manual creation of threads. What if thread 2 has priority over thread 1 and thread 1 needs to change the variable. If not, NULL should be passed. Usually, thread pools are bound to a queue from which tasks are dequeued for execution by worker threads. A thread pool may also replace a thread if it dies of an unexpected exception. If not, it is better to understand it here: … Will return a new threadpool with 4 threads. A thread pool can be tuned for the size of the threads it holds. thpool_wait(thpool) Will wait for all jobs (both in queue and currently running) to finish. The thread queue continuously fetches the tasks in the task queue to execute. Still maintained. Recently, I wrote a thread pool. In practice, if it is required to access global variable by multiple threads, then they should be accessed using a mutex. Threadpool in C++ is basically a pool having a fixed number of threads used when we want to work multiple tasks together (run multiple threads concurrently). Often also called a replicated workers or worker-crew model, a thread pool maintains multiple threads waiting for tasks to be allocated for concurrent execution by the supervising program. A thread pool may contain a number of threads each performing a specific task. if all the threads in a thread pool are occupied in performing there task then a new task, which need to be processed wait in a queue until a thread becomes free.net framework provides thread pool through the threadpool class. I would like to see your review of it. You can also queue work items that are not related to a wait operation to the thread pool. This thread sits idle in the thread pool when there are no tasks and when a task arrives, it is sent to the thread pool and gets assigned to the thread. What open-source implementation(s) in C for a pthreads thread pool would you recommend ? The center of a thread pool will be how to assign work to the worker threads. 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