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process.cpython-310.pyc
o }5h| @ s d Z dZddlZddlmZ ddlZddlZddlZddl m Z ddl Z ddl Z ddl mZ ddlZddlZddlZe ZdaG dd d Zd d Ze e d Zd ZG dd deZG dd dZ dd Z G dd de Z G dd de Z G dd de Z!G dd de Z"d d Z#d d Z$d.d d!Z%d"d# Z&G d$d% d%e j'Z(da)da*d&d' Z+d(d) Z,G d*d+ d+ej-Z.G d,d- d-ej/Z0dS )/a- Implements ProcessPoolExecutor. The following diagram and text describe the data-flow through the system: |======================= In-process =====================|== Out-of-process ==| +----------+ +----------+ +--------+ +-----------+ +---------+ | | => | Work Ids | | | | Call Q | | Process | | | +----------+ | | +-----------+ | Pool | | | | ... | | | | ... | +---------+ | | | 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 "Result Q" z"Brian Quinlan (brian@sweetapp.com) N)_base)Queue)partialFc @ s, e Zd Zdd Zdd Zdd Zdd Zd S ) _ThreadWakeupc C s d| _ tjdd\| _| _d S )NF)duplex)_closedmpPipe_reader_writerself r 1/usr/lib/python3.10/concurrent/futures/process.py__init__C s z_ThreadWakeup.__init__c C s( | j sd| _ | j | j d S d S NT)r r closer r r r r r G s z_ThreadWakeup.closec C s | j s | jd d S d S )N )r r send_bytesr r r r wakeupM s z_ThreadWakeup.wakeupc C s0 | j s| j r| j | j sd S d S d S N)r r poll recv_bytesr r r r clearQ s z_ThreadWakeup.clearN)__name__ __module__ __qualname__r r r r r r r r r B s r c C s@ da tt } | D ]\}}| q | D ]\}}| qd S r )_global_shutdownlist_threads_wakeupsitemsr join)r _ thread_wakeuptr r r _python_exitW s r% = c @ e Zd Zdd Zdd ZdS )_RemoteTracebackc C s || _ d S r tb)r r+ r r r r w s z_RemoteTraceback.__init__c C s | j S r r* r r r r __str__y s z_RemoteTraceback.__str__N)r r r r r, r r r r r) v s r) c @ r( )_ExceptionWithTracebackc C s8 t t|||}d|}|| _d | j_d| | _d S )N z """ %s""") tracebackformat_exceptiontyper! exc __traceback__r+ )r r2 r+ r r r r } s z _ExceptionWithTraceback.__init__c C s t | j| jffS r ) _rebuild_excr2 r+ r r r r __reduce__ s z"_ExceptionWithTraceback.__reduce__N)r r r r r5 r r r r r- | s r- c C s t || _| S r )r) __cause__)r2 r+ r r r r4 s r4 c @ e Zd Zdd ZdS ) _WorkItemc C || _ || _|| _|| _d S r )futurefnargskwargs)r r: r; r< r= r r r r z_WorkItem.__init__Nr r r r r r r r r8 r8 c @ s e Zd ZdddZdS ) _ResultItemNc C s || _ || _|| _d S r )work_id exceptionresult)r rB rC rD r r r r s z_ResultItem.__init__NNr? r r r r rA s rA c @ r7 ) _CallItemc C r9 r )rB r; r< r= )r rB r; r< r= r r r r r> z_CallItem.__init__Nr? r r r r rF r@ rF c s. e Zd ZdZd fdd Z fddZ ZS ) _SafeQueuez=Safe Queue set exception to the future object linked to a jobr c s& || _ || _|| _t j||d d S )N)ctx)pending_work_items shutdown_lockr# superr )r max_sizerH rI rJ r# __class__r r r s z_SafeQueue.__init__c s t |trHtt|||j}tdd||_ | j |j d }| j | j W d n1 s5w Y |d urF|j| d S d S t || d S )Nz """ {}"""r. ) isinstancerF r/ r0 r1 r3 r) formatr! r6 rI poprB rJ r# r r: set_exceptionrK _on_queue_feeder_error)r eobjr+ work_itemrM r r rS s z!_SafeQueue._on_queue_feeder_error)r )r r r __doc__r rS __classcell__r r rM r rG s rG c g s, t | } tt|| }|sdS |V q)z, Iterates over zip()ed iterables in chunks. TN)ziptuple itertoolsislice) chunksize iterablesitchunkr r r _get_chunks s ra c s fdd|D S )z Processes a chunk of an iterable passed to map. Runs the function passed to map() on a chunk of the iterable passed to map. This function is run in a separate process. c s g | ]} | qS r r ).0r< r; r r <listcomp> s z"_process_chunk.<locals>.<listcomp>r )r; r` r rc r _process_chunk s re c C s` z | t|||d W dS ty/ } zt||j}| t||d W Y d}~dS d}~ww )z.Safely send back the given result or exception)rD rC rC N)putrA BaseExceptionr- r3 ) result_queuerB rD rC rT r2 r r r _sendback_result s rj c C s |dur z|| W n t y tjjddd Y dS w | jdd}|du r1|t dS z |j|j i |j }W n t y] } zt ||j }t ||j|d W Y d}~nd}~ww t ||j|d ~~q )a Evaluates calls from call_queue and places the results in result_queue. This worker is run in a separate process. Args: call_queue: A ctx.Queue of _CallItems that will be read and evaluated by the worker. result_queue: A ctx.Queue of _ResultItems that will written to by the worker. initializer: A callable initializer, or None initargs: A tuple of args for the initializer NzException in initializer:T)exc_infoblockrf )rD )rh r LOGGERcriticalgetrg osgetpidr; r< r= r- r3 rj rB ) call_queueri initializerinitargs call_itemrrT r2 r r r _process_worker s. rx c sp e Zd ZdZ fddZdd Zdd Zdd Zd d Zd d Z dd Z dd Z dd Z dd Z dd Z ZS )_ExecutorManagerThreadat Manages the communication between this process and the worker processes. The manager is run in a local thread. Args: executor: A reference to the ProcessPoolExecutor that owns this thread. A weakref will be own by the manager as well as references to internal objects used to introspect the state of the executor. c sf |j | _|j| _| j| jfdd}t||| _|j| _|j | _ |j | _ |j | _|j| _t d S )Nc S s> t jd | | W d d S 1 sw Y d S )Nz?Executor collected: triggering callback for QueueManager wakeup)r utildebugr )r" r# rJ r r r weakref_cb s "z3_ExecutorManagerThread.__init__.<locals>.weakref_cb) _executor_manager_thread_wakeupr# _shutdown_lockrJ weakrefrefexecutor_reference _processes processes _call_queuers _result_queueri _work_idswork_ids_queue_pending_work_itemsrI rK r )r executorr| rM r r r s z _ExecutorManagerThread.__init__c C s | | \}}}|r| | d S |d ur-| | ~| }|d ur,|j ~| rB| | | j sB| d S qr ) add_call_item_to_queue wait_result_broken_or_wakeupterminate_brokenprocess_result_itemr _idle_worker_semaphorereleaseis_shutting_downflag_executor_shutting_downrI join_executor_internals)r result_item is_brokencauser r r r run: s( z_ExecutorManagerThread.runc C s| | j rd S z | jjdd}W n tjy Y d S w | j| }|j r8| j j t ||j |j |j dd n| j|= q q)NTFrl )rs fullr rp queueEmptyrI r: set_running_or_notify_cancelrg rF r; r< r= )r rB rV r r r r _ s( z-_ExecutorManagerThread.add_call_item_to_queuec C s | j j}| jjr J | jj}||g}dd t| j D }tj || }d }d}d }||v rUz| }d}W n" t yT } zt t| | | j}W Y d } ~ n d } ~ ww ||v r[d}| j | j W d n1 snw Y |||fS )Nc S s g | ]}|j qS r )sentinelrb pr r r rd s zG_ExecutorManagerThread.wait_result_broken_or_wakeup.<locals>.<listcomp>TF)ri r r# r r r valuesr connectionwaitrecvrh r/ r0 r1 r3 rJ r ) r result_reader wakeup_readerreadersworker_sentinelsreadyr r r rT r r r r v s. z3_ExecutorManagerThread.wait_result_broken_or_wakeupc C s t |tr | s J | j|}| | js | d S d S | j|jd }|d urA|j r8|j |j d S |j |j d S d S r )rO intr r rQ r! r rI rB rC r: rR set_resultrD )r r r rV r r r r s z*_ExecutorManagerThread.process_result_itemc C s | }tp |d u p |jS r )r r _shutdown_thread)r r r r r r s z'_ExecutorManagerThread.is_shutting_downc C s | }|d urd|_d|_d }td}|d ur$tdd| d|_| j D ] \}}|j | ~q)| j | j D ]}| q?| d S )NzKA child process terminated abruptly, the process pool is not usable anymoreTz^A process in the process pool was terminated abruptly while the future was running or pending.z ''' r. z''')r _brokenr BrokenProcessPoolr) r! r6 rI r r: rR r r r terminater )r r r bperB rV r r r r r s" z'_ExecutorManagerThread.terminate_brokenc C s | }|d ur?d|_|jrAi }| j D ] \}}|j s"|||< q|| _ z| j W n t j y8 Y nw q'd|_d S d S d S )NTF) r r _cancel_pending_futuresrI r r: cancelr get_nowaitr r )r r new_pending_work_itemsrB rV r r r r s( z2_ExecutorManagerThread.flag_executor_shutting_downc C s | }d}||k r<| dkr>t|| D ]}z | jd |d7 }W q tjy/ Y nw ||k r@| dksd S d S d S d S )Nr r& )get_n_children_aliverangers put_nowaitr Full)r n_children_to_stopn_sentinels_sentir r r shutdown_workers s z'_ExecutorManagerThread.shutdown_workersc C sh | | j | j | j | j W d n1 s!w Y | j D ]}| q+d S r ) r rs r join_threadrJ r# r r r! r r r r r r s z._ExecutorManagerThread.join_executor_internalsc C s t dd | j D S )Nc s s | ]}| V qd S r )is_aliver r r r <genexpr> s z>_ExecutorManagerThread.get_n_children_alive.<locals>.<genexpr>)sumr r r r r r r s z+_ExecutorManagerThread.get_n_children_alive)r r r rW r r r r r r r r r r r rX r r rM r ry s +% & ry c C s t rtrttda zdd l} W n ty dattw ztd}W n ttfy1 Y d S w |dkr8d S |dkr>d S d| att)NTr zxThis Python build lacks multiprocessing.synchronize, usually due to named semaphores being unavailable on this platform.SC_SEM_NSEMS_MAX z@system provides too few semaphores (%d available, 256 necessary)) _system_limits_checked_system_limitedNotImplementedErrormultiprocessing.synchronize ImportErrorrq sysconfAttributeError ValueError)multiprocessing nsems_maxr r r _check_system_limits s0 r c c s* | D ]}| |r| V |s qdS )z Specialized implementation of itertools.chain.from_iterable. Each item in *iterable* should be a list. This function is careful not to keep references to yielded objects. N)reverserQ )iterableelementr r r _chain_from_iterable_of_lists9 s r c @ s e Zd ZdZdS )r zy Raised when a process in a ProcessPoolExecutor terminated abruptly while a future was in the running state. N)r r r rW r r r r r E s r c s e Zd Z dddZdd Zdd Zd d Zd d Zd d Ze j jj e_ ddd fdd Z dddddZ e j j j e _ ZS )ProcessPoolExecutorNr c C sH t |du rt p d| _tjdkrtt| j| _n|dkr#tdtjdkr3|tkr3tdt || _|du r>t }|| _ | j j ddd k| _ |durWt|sWtd || _|| _d| _i | _d| _t | _td| _d| _d| _i | _ d| _ t | _ | jt }t!|| j | j | j| j d | _"d | j"_#|$ | _%t&' | _(dS ) aS 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. mp_context: A multiprocessing context to launch the workers. This object should provide SimpleQueue, Queue and Process. initializer: A callable used to initialize worker processes. initargs: A tuple of arguments to pass to the initializer. Nr& win32r z"max_workers must be greater than 0zmax_workers must be <= F) allow_noneforkz initializer must be a callable)rL rH rI rJ r# T))r rq cpu_count _max_workerssysplatformmin_MAX_WINDOWS_WORKERSr r get_context _mp_contextget_start_method#_safe_to_dynamically_spawn_childrencallable TypeError _initializer _initargs_executor_manager_threadr r threadingLockr~ Semaphorer r _queue_countr r r r} EXTRA_QUEUED_CALLSrG r _ignore_epipe SimpleQueuer r r r )r max_workers mp_contextrt ru queue_sizer r r r M sZ z ProcessPoolExecutor.__init__c C s@ | j d u r | js | t| | _ | j | jt| j < d S d S r )r r _launch_processesry startr} r r r r r _start_executor_manager_thread s z2ProcessPoolExecutor._start_executor_manager_threadc C s6 | j jddr d S t| j}|| jk r| d S d S )NF)blocking)r acquirelenr r _spawn_process)r process_countr r r _adjust_process_count s z)ProcessPoolExecutor._adjust_process_countc C s2 | j rJ dtt| j| jD ]}| qd S )NzhProcesses cannot be fork()ed after the thread has started, deadlock in the child processes could result.)r r r r r r )r r" r r r r s z%ProcessPoolExecutor._launch_processesc C s8 | j jt| j| j| j| jfd}| || j|j < d S )N)targetr< ) r Processrx r r r r r r pidr r r r r s z"ProcessPoolExecutor._spawn_processc O s | j N | jr t| j| jrtdtrtdt }t||||}|| j | j < | j | j | j d7 _ | j | jrD| | |W d S 1 sTw Y d S )Nz*cannot schedule new futures after shutdownz6cannot schedule new futures after interpreter shutdownr& )r~ r r r RuntimeErrorr r Futurer8 r r r rg r} r r r r )r r; r< r= fwr r r submit s$ $zProcessPoolExecutor.submitr& )timeoutr] c s: |dk rt dt jtt|t|d|i|d}t|S )aj Returns an iterator equivalent to map(fn, iter). Args: fn: A callable that will take as many arguments as there are passed iterables. timeout: The maximum number of seconds to wait. If None, then there is no limit on the wait time. chunksize: If greater than one, the iterables will be chopped into chunks of size chunksize and submitted to the process pool. If set to one, the items in the list will be sent one at a time. Returns: An iterator equivalent to: map(func, *iterables) but the calls may be evaluated out-of-order. Raises: TimeoutError: If the entire result iterator could not be generated before the given timeout. Exception: If fn(*args) raises for any values. r& zchunksize must be >= 1.r] )r )r rK mapr re ra r )r r; r r] r^ resultsrM r r r s zProcessPoolExecutor.mapTF)cancel_futuresc C s | j || _d| _| jd ur| j W d n1 s w Y | jd ur/|r/| j d | _d | _| jd urA|rA| j d | _d | _ d | _d S r ) r~ r r r} r r r! r r r r )r r r r r r shutdown s z ProcessPoolExecutor.shutdown)NNNr )T)r r r r r r r r r r ExecutorrW r r rX r r rM r r L s U r rE )1rW __author__rq concurrent.futuresr r r r multiprocessing.connectionmultiprocessing.queuesr r r functoolsr r[ r r/ WeakKeyDictionaryr r r r% _register_atexitr r Exceptionr) r- r4 objectr8 rA rF rG ra re rj rx Threadry r r r r BrokenExecutorr r r r r r r <module> sR * )