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What open-source implementation(s) in C for a pthreads thread pool would you recommend ?
Additional points if this implementation is :
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shutdownNow() should be used to shutdown the thread pool to gracefully exiting the application.
Thread pools do not make sense when you need thread which perform entirely dissimilar and unrelated actions, which cannot be considered "jobs"; e.g., One thread for GUI event handling, another for backend processing. Thread pools also don't make sense when processing forms a pipeline.
A thread pool helps mitigate the issue of performance by reducing the number of threads needed and managing their lifecycle. Essentially, threads are kept in the thread pool until they're needed, after which they execute the task and return the pool to be reused later.
The thread pool implementation consists of two parts. A ThreadPool class which is the public interface to the thread pool, and a PoolThread class which implements the threads that execute the tasks. To execute a task the method ThreadPool. execute(Runnable r) is called with a Runnable implementation as parameter.
I worked on making something I'd be able to use and I've published it on github: it's unimaginably called threadpool.
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If your goal is light-weight, then the last thing you want is a prewritten, super-general-purpose, high-level-abstraction-based implementation. Implementing a thread pool yourself, suited to your particular task, is fairly trivial, but you might also question whether you actually need a thread pool or whether you'd be fine just creating and destroying threads as needed.
Without knowing more details about your application, I can't give much more specific advice. But the tools you might find useful are:
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