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__init__.py
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__init__.pyc
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__init__.pyo
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_base.py
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_base.pyc
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_base.pyo
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process.py
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process.pyc
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process.pyo
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thread.py
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thread.pyc
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thread.pyo
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� i��Xc @ s! d Z d d l Z d d l m Z d d l Z d d l Z d d l Z d d l Z d d l Z d Z e j � Z e a d � Z d Z d e f d � � YZ d e f d � � YZ d e f d � � YZ d � Z d � Z d � Z e a d a d � Z d e j f d � � YZ e j e � d S( s+ Implements ProcessPoolExecutor. The follow diagram and text describe the data-flow through the system: |======================= In-process =====================|== Out-of-process ==| +----------+ +----------+ +--------+ +-----------+ +---------+ | | => | Work Ids | => | | => | Call Q | => | | | | +----------+ | | +-----------+ | | | | | ... | | | | ... | | | | | | 6 | | | | 5, call() | | | | | | 7 | | | | ... | | | | Process | | ... | | Local | +-----------+ | Process | | Pool | +----------+ | Worker | | #1..n | | Executor | | Thread | | | | | +----------- + | | +-----------+ | | | | <=> | Work Items | <=> | | <= | Result Q | <= | | | | +------------+ | | +-----------+ | | | | | 6: call() | | | | ... | | | | | | future | | | | 4, result | | | | | | ... | | | | 3, except | | | +----------+ +------------+ +--------+ +-----------+ +---------+ Executor.submit() called: - creates a uniquely numbered _WorkItem and adds it to the "Work Items" dict - adds the id of the _WorkItem to the "Work Ids" queue Local worker thread: - reads work ids from the "Work Ids" queue and looks up the corresponding WorkItem from the "Work Items" dict: if the work item has been cancelled then it is simply removed from the dict, otherwise it is repackaged as a _CallItem and put in the "Call Q". New _CallItems are put in the "Call Q" until "Call Q" is full. NOTE: the size of the "Call Q" is kept small because calls placed in the "Call Q" can no longer be cancelled with Future.cancel(). - reads _ResultItems from "Result Q", updates the future stored in the "Work Items" dict and deletes the dict entry Process #1..n: - reads _CallItems from "Call Q", executes the calls, and puts the resulting _ResultItems in "Request Q" i����N( t _bases" Brian Quinlan (brian@sweetapp.com)c C ss t a t r t t j � � n d } x! | D] \ } } | j d � q+ Wx$ | D] \ } } | j t j � qO Wd S( N( ( t Truet _shutdownt _threads_queuest listt itemst putt Nonet joint syst maxint( R t tt q( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _python_exitI s i t _WorkItemc B s e Z d � Z RS( c C s( | | _ | | _ | | _ | | _ d S( N( t futuret fnt argst kwargs( t selfR R R R ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt __init__Y s ( t __name__t __module__R ( ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyR X s t _ResultItemc B s e Z d d d � Z RS( c C s | | _ | | _ | | _ d S( N( t work_idt exceptiont result( R R R R ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyR ` s N( R R R R ( ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyR _ s t _CallItemc B s e Z d � Z RS( c C s( | | _ | | _ | | _ | | _ d S( N( R R R R ( R R R R R ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyR f s ( R R R ( ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyR e s c C s� x� t r� | j d t � } | d k r8 | j d � d Sy | j | j | j � } Wn3 t j � d } | j t | j d | �� q X| j t | j d | �� q Wd S( s� Evaluates calls from call_queue and places the results in result_queue. This worker is run in a separate process. Args: call_queue: A multiprocessing.Queue of _CallItems that will be read and evaluated by the worker. result_queue: A multiprocessing.Queue of _ResultItems that will written to by the worker. shutdown: A multiprocessing.Event that will be set as a signal to the worker that it should exit when call_queue is empty. t blockNi R R ( R t getR R R R R R t exc_infoR R ( t call_queuet result_queuet call_itemt rt e( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _process_workerl s c C s� x� t r� | j � r d Sy | j d t � } Wn t j k rF d SX| | } | j j � r� | j t | | j | j | j � d t �q | | =q q Wd S( sM Fills call_queue with _WorkItems from pending_work_items. This function never blocks. Args: pending_work_items: A dict mapping work ids to _WorkItems e.g. {5: <_WorkItem...>, 6: <_WorkItem...>, ...} work_ids: A queue.Queue of work ids e.g. Queue([5, 6, ...]). Work ids are consumed and the corresponding _WorkItems from pending_work_items are transformed into _CallItems and put in call_queue. call_queue: A multiprocessing.Queue that will be filled with _CallItems derived from _WorkItems. NR ( R t fullR t Falset queuet EmptyR t set_running_or_notify_cancelR R R R R ( t pending_work_itemst work_idsR R t work_item( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _add_call_item_to_queue� s c s& d g � � � f d � } xt r!t | | � � | j d t � } | d k r� | | j } | | j =| j r� | j j | j � n | j j | j � ~ n | � } t s� | d k s� | j r| sx! � d t | � k r� | � q� Wx | D] } | j � q� W� j � d Sn ~ q Wd S( s� Manages the communication between this process and the worker processes. This function is run in a local thread. Args: executor_reference: A weakref.ref to the ProcessPoolExecutor that owns this thread. Used to determine if the ProcessPoolExecutor has been garbage collected and that this function can exit. process: A list of the multiprocessing.Process instances used as workers. pending_work_items: A dict mapping work ids to _WorkItems e.g. {5: <_WorkItem...>, 6: <_WorkItem...>, ...} work_ids_queue: A queue.Queue of work ids e.g. Queue([5, 6, ...]). call_queue: A multiprocessing.Queue that will be filled with _CallItems derived from _WorkItems for processing by the process workers. result_queue: A multiprocessing.Queue of _ResultItems generated by the process workers. i c s! � j d � � d c d 7<d S( s< Tell a worker to terminate, which will in turn wake us againi i N( R R ( ( R t nb_shutdown_processes( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt shutdown_one_process� s R N( R R- R R R R R t set_exceptiont set_resultR R t _shutdown_threadt lenR t close( t executor_referencet processesR* t work_ids_queueR R R/ t result_itemR, t executort p( ( R R. s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _queue_management_worker� s0 c C s� t r t r t t � � q n t a y d d l } | j d � } Wn t t f k r] d SX| d k rn d S| d k r~ d Sd | a t t � � d S( Ni����t SC_SEM_NSEMS_MAXi s@ system provides too few semaphores (%d available, 256 necessary)( t _system_limits_checkedt _system_limitedt NotImplementedErrorR t ost sysconft AttributeErrort ValueError( R@ t nsems_max( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _check_system_limits� s t ProcessPoolExecutorc B s_ e Z d d � Z d � Z d � Z d � Z e j j j e _ e d � Z e j j j e _ RS( c C s� t � | d k r% t j � | _ n$ | d k r@ t d � � n | | _ t j | j t � | _ t j � | _ t j � | _ d | _ t � | _ t | _ t j � | _ d | _ i | _ d S( s/ Initializes a new ProcessPoolExecutor instance. Args: max_workers: The maximum number of processes that can be used to execute the given calls. If None or not given then as many worker processes will be created as the machine has processors. i s" max_workers must be greater than 0N( RE R t multiprocessingt cpu_countt _max_workersRC t Queuet EXTRA_QUEUED_CALLSt _call_queuet _result_queueR' t _work_idst _queue_management_threadt sett _processesR& R2 t threadingt Lockt _shutdown_lockt _queue_countt _pending_work_items( R t max_workers( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyR s c C s� | j d � } | j d k r� t j d t d t j | | � | j | j | j | j | j f � | _ t | j _ | j j � | j t | j <n d S( Nc S s | j d � d S( N( R R ( t _R ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt weakref_cb0 s t targetR ( RM RO R RR t ThreadR; t weakreft refRQ RV RN RL R t daemont startR ( R RY ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _start_queue_management_thread- s c C sh xa t t | j � | j � D]D } t j d t d | j | j f � } | j � | j j | � q Wd S( NRZ R ( t rangeR3 RQ RI RG t ProcessR$ RL RM R_ t add( R RX R: ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt _adjust_process_count? s " c O s� | j �� | j r" t d � � n t j � } t | | | | � } | | j | j <| j j | j � | j d 7_ | j j d � | j � | j � | SWd QXd S( Ns* cannot schedule new futures after shutdowni ( RT R2 t RuntimeErrorR t FutureR RV RU RN R RM R R` Rd ( R R R R t ft w( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt submitH s c C sy | j � t | _ Wd QX| j rQ | j j d � | rQ | j j t j � qQ n d | _ d | _ d | _ d | _ d S( N( RT R R2 RO RM R R R R R RL RQ ( R t wait( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt shutdown[ s N( R R R R R` Rd Ri R t Executort __doc__R Rk ( ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyRF s " ( Rm t atexitt concurrent.futuresR RJ R' RG RR R\ R t __author__t WeakKeyDictionaryR R& R R RK t objectR R R R$ R- R; R= R R> RE Rl RF t register( ( ( s> /usr/lib/python2.7/site-packages/concurrent/futures/process.pyt <module>, s. % B a