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# -*- test-case-name: twisted._threads.test -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Interfaces related to threads. """ from zope.interface import Interface class AlreadyQuit(Exception): """ This worker worker is dead and cannot execute more instructions. """ class IWorker(Interface): """ A worker that can perform some work concurrently. All methods on this interface must be thread-safe. """ def do(task): """ Perform the given task. As an interface, this method makes no specific claims about concurrent execution. An L{IWorker}'s C{do} implementation may defer execution for later on the same thread, immediately on a different thread, or some combination of the two. It is valid for a C{do} method to schedule C{task} in such a way that it may never be executed. It is important for some implementations to provide specific properties with respect to where C{task} is executed, of course, and client code may rely on a more specific implementation of C{do} than L{IWorker}. @param task: a task to call in a thread or other concurrent context. @type task: 0-argument callable @raise AlreadyQuit: if C{quit} has been called. """ def quit(): """ Free any resources associated with this L{IWorker} and cause it to reject all future work. @raise AlreadyQuit: if this method has already been called. """ class IExclusiveWorker(IWorker): """ Like L{IWorker}, but with the additional guarantee that the callables passed to C{do} will not be called exclusively with each other. """