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The common language runtime or a host process terminates the thread.įor more information, see Exceptions in Managed Threads.A System.AppDomainUnloadedException is thrown in a thread pool thread because the application domain is being unloaded.A is thrown in a thread pool thread because Thread.Abort was called.Unhandled exceptions in thread pool threads terminate the process. There is only one thread pool per process. This reuse enables applications to avoid the cost of creating a new thread for each task.

Once a thread in the thread pool completes its task, it's returned to a queue of waiting threads. Each thread uses the default stack size, runs at the default priority, and is in the multithreaded apartment. Thread pool threads are background threads. NET uses thread pool threads for many purposes, including Task Parallel Library (TPL) operations, asynchronous I/O completion, timer callbacks, registered wait operations, asynchronous method calls using delegates, and System.Net socket connections. Use of the thread pool is significantly easier in Framework 4 and later, since you can create Task and Task objects that perform asynchronous tasks on thread pool threads. If you have short tasks that require background processing, the managed thread pool is an easy way to take advantage of multiple threads. The class provides your application with a pool of worker threads that are managed by the system, allowing you to concentrate on application tasks rather than thread management.

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