ó šßÈ[c@sFdZddlZddlZddlZddlZddlZddlmZddlm Z yddl Z Wne k r‘ddl Z nXdZ eƒZead„Zd „ZdZd efd „ƒYZd efd „ƒYZdefd„ƒYZd„Zd„Zd„Zdejfd„ƒYZejeƒdS(s Implements ProcessPoolExecutor. The follow diagram and text describe the data-flow through the system:: |==================== In-process ====================|== Out-of-process ==| +----------+ +-------+ +--------+ +----------+ +---------+ | | => | Work | => | | => | Call Q | => | | | | | Ids | | | | | | | | | +-------+ | | +----------+ | | | | | ... | | | |... | | | | | | 6 | | | |5, call() | | | | | | 7 | | | |... | | | | Process | | ... | | Local | +----------+ | Process | | Pool | +-------+ | Worker | | #1..n | | Executor | | Thread | | | | | +---------+ | | +----------+ | | | | <=> | Work | <=> | | <= | Result Q | <= | | | | | Items | | | | | | | | | +---------+ | | +----------+ | | | | |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' iÿÿÿÿNi(t_basei(tranges"Brian Quinlan (brian@sweetapp.com)cCs=tax0tD](}|ƒ}|dk r |jƒq q WdS(N(tTruet _shutdownt_thread_referencestNonetjoin(tthread_referencetthread((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt _python_exitUs    cCs:x3ttƒD]%}|ƒdkr tj|ƒq q WdS(sRemove inactive threads from _thread_references. Should be called periodically to prevent memory leaks in scenarios such as: >>> while True: ... t = ThreadPoolExecutor(max_workers=5) ... t.map(int, ['1', '2', '3', '4', '5']) N(tsetRRtdiscard(R((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt_remove_dead_thread_references^st _WorkItemcBseZd„ZRS(cCs(||_||_||_||_dS(N(tfuturetfntargstkwargs(tselfRRRR((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt__init__ss   (t__name__t __module__R(((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyR rst _ResultItemcBseZddd„ZRS(cCs||_||_||_dS(N(twork_idt exceptiontresult(RRRR((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyR{s  N(RRRR(((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyRzst _CallItemcBseZd„ZRS(cCs(||_||_||_||_dS(N(RRRR(RRRRR((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyR‚s   (RRR(((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyRscCsÌxÅtrÇy|jdtddƒ}Wn$tjk rK|jƒrÄdSqXy|j|j|jŽ}Wn=tk r§t j ƒd}|j t |j d|ƒƒqX|j t |j d|ƒƒqWdS(sEvaluates calls from call_queue and places the results in result_queue. This worker is run in a separate process. Parameters ---------- call_queue A `multiprocessing.Queue` of _CallItems that will be read and evaluated by the worker. result_queue A `multiprocessing.Queue` of _ResultItems that will written to by the worker. shutdown A `multiprocessing.Event` that will be set as a signal to the worker that it should exit when call_queue is empty. tblockttimeoutgš™™™™™¹?NiRR(RtgettqueuetEmptytis_setRRRt BaseExceptiontsystexc_infotputRR(t call_queuet result_queuetshutdownt call_itemtrte((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt_process_worker‰s   cCs x™tr›|jƒrdSy|jdtƒ}Wntjk rFdSX||}|jjƒrŽ|jt ||j |j |j ƒdtƒq||=qqWdS(sXFills call_queue with _WorkItems from pending_work_items. This function never blocks. Parameters ---------- pending_work_items A dict mapping work ids to _WorkItems e.g. {5: <_WorkItem...>, 6: <_WorkItem...>, ...} work_ids A queue.Queue of work ids e.g. Queue([5, 6, ...]). Work ids are consumed and the corresponding _WorkItems from pending_work_items are transformed into _CallItems and put in call_queue. call_queue A multiprocessing.Queue that will be filled with _CallItems derived from _WorkItems. NR( RtfullRtFalseRRRtset_running_or_notify_cancelR$RRRR(tpending_work_itemstwork_idsR%Rt work_item((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt_add_call_item_to_queue®s       c Csöxïtrñt|||ƒy|jdtddƒ}Wnmtjk r¤|ƒ}tsl|dksl|jrž|sž|jƒx|D]} | j ƒqƒWdSn~qX||j } ||j =|j rÛ| j j |j ƒq| j j|jƒqWdS(sIManages the communication between this process and the worker processes. This function is run in a local thread. Parameters ---------- 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. shutdown_process_event A multiprocessing.Event used to signal the process workers that they should exit when their work queue is empty. RRgš™™™™™¹?N(RR2RRRRRt_shutdown_threadR RRRRt set_exceptiont set_resultR( texecutor_referencet processesR/twork_ids_queueR%R&tshutdown_process_eventt result_itemtexecutortpR1((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt_queue_manangement_workerÚs(*       tProcessPoolExecutorcBs_eZdd„Zd„Zd„Zd„Zejjj e_ e d„Z ejj j e _ RS(cCs·tƒ|dkr%tjƒ|_n ||_tj|jtƒ|_tjƒ|_t jƒ|_ d|_ t ƒ|_ t|_tjƒ|_tjƒ|_d|_i|_dS(sFInitializes a new ProcessPoolExecutor instance. Parameters ---------- 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. iN(R Rtmultiprocessingt cpu_countt _max_workerstQueuetEXTRA_QUEUED_CALLSt _call_queuet _result_queueRt _work_idst_queue_management_threadR t _processesR-R3tEventt_shutdown_process_eventt threadingtLockt_shutdown_lockt _queue_countt_pending_work_items(Rt max_workers((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyR)s         c Cs“|jdkrtjdtdtj|ƒ|j|j|j |j |j |j fƒ|_t |j_|jjƒtjtj|jƒƒndS(NttargetR(RGRRKtThreadR=tweakreftrefRHRORFRDRERJRtdaemontstartRtadd(R((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt_start_queue_management_threadKs    cCsnxgtt|jƒ|jƒD]J}tjdtd|j|j|j fƒ}|j ƒ|jj |ƒqWdS(NRQR( RtlenRHRAR?tProcessR+RDRERJRVRW(Rt_R<((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt_adjust_process_countZs" c Os—|jˆ|jr"tdƒ‚ntjƒ}t||||ƒ}||j|j<|jj |jƒ|jd7_|j ƒ|j ƒ|SWdQXdS(Ns*cannot schedule new futures after shutdowni( RMR3t RuntimeErrorRtFutureR RORNRFR$RXR\(RRRRtftw((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pytsubmitcs      cCsl|jt|_WdQX|r;|jr;|jjƒq;nd|_d|_d|_d|_d|_ dS(N( RMRR3RGRRRDRERJRH(Rtwait((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyR'us      N( RRRRRXR\RaRtExecutort__doc__RR'(((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyR>(s "   (RdtatexitR?RKRSR"tRtextern.six.movesRRt ImportErrorRBt __author__R RR-RR R RCtobjectR RRR+R2R=RcR>tregister(((sClib/python2.7/site-packages/astropy/utils/compat/futures/process.pyt0s2         % , N]