Now when a request comes, then it directly goes to the thread pool and checks whether there are any free threads available or not. 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. I would like to see your review of it. A queue of structs that hold job descriptions is easy to implement. 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. The thread queue continuously fetches the tasks in the task queue to execute. To request that a work item be handled by a thread in the thread pool, call the QueueUserWorkItem method. You can also queue work items that are not related to a wait operation to the thread pool. If not, NULL should be passed. When the task queue is empty, the thread blocks and waits for new tasks to be added. thpool_wait(thpool) Will wait for all jobs (both in queue and currently running) to finish. 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. thpool_add_work(thpool, (void*)function_p, (void*)arg_p) Will add new work to the pool. A thread pool can be tuned for the size of the threads it holds. Please note that above is simple example to show how threads work. Recently, I wrote a thread pool. A thread pool may contain a number of threads each performing a specific task. What if thread 2 has priority over thread 1 and thread 1 needs to change the variable. What open-source implementation(s) in C for a pthreads thread pool would you recommend ? Usually, thread pools are bound to a queue from which tasks are dequeued for execution by worker threads. The center of a thread pool will be how to assign work to the worker threads. Will return a new threadpool with 4 threads. Additional points if this implementation is : Light-weight: glib, APR, NSPR and others come with a big buy-in, I'd rather have just 2 files (header and implementation). Generally speaking, the thread pool has a task queue and a thread queue. A thread pool may also replace a thread if it dies of an unexpected exception. 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). Accessing a global variable in a thread is generally a bad idea. 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). It is assumed that the reader has a certain multithreading foundation. In practice, if it is required to access global variable by multiple threads, then they should be accessed using a mutex. I wrote a simple thread pool, which works pretty well. I … In computer programming, a thread pool is a software design pattern for achieving concurrency of execution in a computer program. Still maintained. 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. 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). If not, it is better to understand it here: … 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. 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