A queue of structs that hold job descriptions is easy to implement. Using a thread pool immediately alleviates from the ails of manual creation of threads. The center of a thread pool will be how to assign work to the worker threads. 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. You can pass a single argument to the function if you wish. Now when a request comes, then it directly goes to the thread pool and checks whether there are any free threads available or not. 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). To request that a work item be handled by a thread in the thread pool, call the QueueUserWorkItem method. 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). If not, it is better to understand it here: … In practice, if it is required to access global variable by multiple threads, then they should be accessed using a mutex. 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. 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). Recently, I wrote a thread pool. If not, NULL should be passed. I would like to see your review of it. 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). 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. What open-source implementation(s) in C for a pthreads thread pool would you recommend ? Please note that above is simple example to show how threads work. It is assumed that the reader has a certain multithreading foundation. I wrote a simple thread pool, which works pretty well. A thread pool can be tuned for the size of the threads it holds. 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. Still maintained. thpool_wait(thpool) Will wait for all jobs (both in queue and currently running) to finish. Tested on several platforms (Linux, BSD, Mac OS X, etc.). Usually, thread pools are bound to a queue from which tasks are dequeued for execution by worker threads. Will return a new threadpool with 4 threads. 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. Accessing a global variable in a thread is generally a bad idea. A thread pool may also replace a thread if it dies of an unexpected exception. 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. In computer programming, a thread pool is a software design pattern for achieving concurrency of execution in a computer program. The thread queue continuously fetches the tasks in the task queue to execute. 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