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threads provide a useful paradigm for an application to do many things at once: if you have something to do, create a thread to do it. using threads can simplify the logic of the application and also take advantage of multiple processors, but creating too many threads can cause overall application performance problems due to contention for resources. creating a thread to do a small amount of work is wasteful. a thread pool manages a set of anonymous threads that perform work on request. the overhead of creating and destroying threads is limited to creating and destroying just the number of active worker threads in the pool. the application can have more tasks than there are worker threads, and this is usually the case. the submitted tasks are processed in order, usually faster than could be done by creating a thread per task.
the idle threads can only exit if they are extra threads, above the number of minimum threads. the thr_pool_queue() function can be used as a replacement for pthread_create() in existing applications. worker threads that are actively processing tasks are cancelled. the example illustrates cancellation and unexpected thread termination, which is one of the trickier aspects of programming with threads. the only harm done is that another worker thread must then be created. a caller of thr_pool_wait() or thr_pool_destroy() may be cancelled by the application while it is waiting. although the example package is useful as it is, an application might require some features that are missing here, such as:
example a–1 thr_pool.h. /* * declarations for the clients of a thread pool. */ # include
example.c. *. * created on: . * author: tomer heber (heber.tomer@ gmail.com). */. #include “threadpool.h”. example#. c++11 threading primitives are still relatively low level. they can be used to write a higher level construct, c++11,14,17,20,… below you will find a simple thread pool implementation usage example: , pthread, thread pool c 23, thread pool c 23, thread pool server c, oracle thread pool, pthread work queue
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