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process.cpython-39.pyc
a �DOg�z � @ 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� de�ZG dd� d�Z 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)�_closed�mp�Pipe�_reader�_writer��self� r �2/usr/lib64/python3.9/concurrent/futures/process.py�__init__C s z_ThreadWakeup.__init__c C s$ | j s d| _ | j�� | j�� d S �NT)r r �closer r r r r r G s z_ThreadWakeup.closec C s | j s| j�d� d S )N� )r r � send_bytesr r r r �wakeupM s z_ThreadWakeup.wakeupc C s | j s | j�� r | j�� qd 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 ]\}}|�� q*d S r )�_global_shutdown�list�_threads_wakeups�itemsr �join)r �_� thread_wakeup�tr r r � _python_exitW s r% � �= c @ s 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 @ s e Zd Zdd� Zdd� ZdS )�_ExceptionWithTracebackc C s8 t �t|�||�}d�|�}|| _d | j_d| | _d S )N� z """ %s""")� traceback�format_exception�typer! �exc� __traceback__r* )r r1 r* r r r r } s z _ExceptionWithTraceback.__init__c C s t | j| jffS r )� _rebuild_excr1 r* r r r r � __reduce__� s z"_ExceptionWithTraceback.__reduce__N)r r r r r4 r r r r r, | s r, c C s t |�| _| S r )r( � __cause__)r1 r* r r r r3 � s r3 c @ s e Zd Zdd� ZdS )� _WorkItemc C s || _ || _|| _|| _d S r )�future�fn�args�kwargs)r r7 r8 r9 r: r r r r � s z_WorkItem.__init__N�r r r r r r r r r6 � s r6 c @ s e Zd Zddd�ZdS )� _ResultItemNc C s || _ || _|| _d S r )�work_id� exception�result)r r= r> r? r r r r � s z_ResultItem.__init__)NNr; r r r r r< � s r< c @ s e Zd Zdd� ZdS )� _CallItemc C s || _ || _|| _|| _d S r )r= r8 r9 r: )r r= r8 r9 r: r r r r � s z_CallItem.__init__Nr; r r r r r@ � s r@ c s. e Zd ZdZd� fdd� Z� fdd�Z� 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_sizerB rC rD r# �� __class__r r r � s z_SafeQueue.__init__c s� t |t�r�t�t|�||j�}td�d�|���|_ | j � |j d �}| j � | j�� W d � n1 sj0 Y |d ur�|j�|� nt� �||� d S )Nz """ {}"""r- )� isinstancer@ r. r/ r0 r2 r( �formatr! r5 rC �popr= rD r# r r7 � set_exceptionrE �_on_queue_feeder_error)r �e�objr* � work_itemrG r r rM � s (z!_SafeQueue._on_queue_feeder_error)r )r r r �__doc__r rM � __classcell__r r rG r rA � s rA c g s, t |� }tt�|| ��}|s dS |V qdS )z, Iterates over zip()ed iterables in chunks. N)�zip�tuple� itertools�islice)� chunksize� iterables�it�chunkr r r � _get_chunks� s r[ 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 )�.0r9 �r8 r r � <listcomp>� r z"_process_chunk.<locals>.<listcomp>r )r8 rZ r r] r �_process_chunk� s r_ c C s` z| � t|||d�� W nB tyZ } z*t||j�}| � t||d�� W Y d}~n d}~0 0 dS )z.Safely send back the given result or exception)r? r> �r> N)�putr< � BaseExceptionr, r2 )� result_queuer= r? r> rN r1 r r r �_sendback_result� s � rd c C s� |dur:z ||� W n$ t y8 tjjddd� Y dS 0 | jdd�}|du r`|�t�� � dS z|j|j i |j ��}W n@ t y� } z(t ||j �}t ||j|d� W Y d}~n d}~0 0 t ||j|d� ~~q:dS )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_info��blockr` )r? )rb r �LOGGER�critical�getra �os�getpidr8 r9 r: r, r2 rd r= )� call_queuerc � initializer�initargs� call_item�rrN r1 r r r �_process_worker� s$ &rr c sp e Zd ZdZ� fdd�Zdd� 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 j�d� |� |�� W d � n1 s.0 Y d S )Nz?Executor collected: triggering callback for QueueManager wakeup)r �util�debugr )r" r# rD r r r � weakref_cb s z3_ExecutorManagerThread.__init__.<locals>.weakref_cb)� _executor_manager_thread_wakeupr# �_shutdown_lockrD �weakref�ref�executor_reference� _processes� processes� _call_queuerm � _result_queuerc � _work_ids�work_ids_queue�_pending_work_itemsrC rE r )r �executorrv rG r r r s � z _ExecutorManagerThread.__init__c C s� | � � | �� \}}}|r(| �|� d S |d urX| �|� ~| �� }|d urV|j�� ~| �� r | �� | j s | � � d S q d S r ) �add_call_item_to_queue� wait_result_broken_or_wakeup�terminate_broken�process_result_itemr{ �_idle_worker_semaphore�release�is_shutting_down�flag_executor_shutting_downrC �join_executor_internals)r � result_item� is_broken�causer� r r r �run: s" z_ExecutorManagerThread.runc C s~ | j �� rd S z| jjdd�}W n tjy6 Y d S 0 | j| }|j�� rn| j j t ||j |j |j �dd� q | j|= q q d S )NFrf T)rm �fullr� rj �queue�EmptyrC r7 � set_running_or_notify_cancelra r@ r8 r9 r: )r r= rP r r r r� Z s" ��z-_ExecutorManagerThread.add_call_item_to_queuec C s� | j j}| jjrJ �| jj}||g}dd� t| j�� �D �}tj� || �}d }d}d }||v r�z|� � }d}W q� t y� } z t � t| �| | j�}W Y d } ~ q�d } ~ 0 0 n ||v r�d}| j� | j�� W d � n1 s�0 Y |||fS )Nc S s g | ] }|j �qS r )�sentinel�r\ �pr r r r^ { r zG_ExecutorManagerThread.wait_result_broken_or_wakeup.<locals>.<listcomp>TF)rc r r# r r r} �valuesr � connection�wait�recvrb r. r/ r0 r2 rD r ) r � result_reader� wakeup_reader�readers�worker_sentinels�readyr� r� r� rN r r r r� q s( ,(z3_ExecutorManagerThread.wait_result_broken_or_wakeupc C s~ t |t�r>| �� sJ �| j�|�}|�� | jsz| �� d S n<| j�|jd �}|d urz|j rl|j � |j � n|j � |j � d S r )rI �intr� r} rK r! r� rC r= r> r7 rL � set_resultr? )r r� r� rP 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 ur d|_d|_d }td�}|d urHtdd�|�� d��|_| j�� D ]\}}|j � |� ~qR| 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! r5 rC r r7 rL r r} r� � terminater� )r r� r� �bper= rP r� r r r r� � s" � z'_ExecutorManagerThread.terminate_brokenc C s� | � � }|d ur|d|_|jr|i }| j�� D ]\}}|j�� s*|||< q*|| _z| j�� W qL t j yr Y qvY qL0 qLd|_d S )NTF) r{ r� �_cancel_pending_futuresrC r r7 �cancelr� � get_nowaitr� r� )r r� �new_pending_work_itemsr= rP r r r r� � s z2_ExecutorManagerThread.flag_executor_shutting_downc C sl | � � }d}||k rh| � � dkrht|| �D ]8}z| j�d � |d7 }W q, tjyb Y q Y q,0 q,q d S )Nr r& )�get_n_children_alive�rangerm � put_nowaitr� �Full)r �n_children_to_stop�n_sentinels_sent�ir r r �shutdown_workers� s � z'_ExecutorManagerThread.shutdown_workersc C sh | � � | j�� | j�� | j� | j�� W d � n1 sB0 Y | j�� D ] }|�� qVd S r ) r� rm r � join_threadrD 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> r 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 rQ r r� r� r� r� r� r� r� r� r� r� rR r r rG r rs s + & rs c C sh t rtrtt��da zt�d�} W n ttfy: Y d S 0 | dkrHd S | dkrTd S d| att��d S )NT�SC_SEM_NSEMS_MAX���� z@system provides too few semaphores (%d available, 256 necessary))�_system_limits_checked�_system_limited�NotImplementedErrorrk �sysconf�AttributeError� ValueError)� nsems_maxr r r �_check_system_limits s �r� c c s& | D ] }|� � |r|�� V qqdS )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)�reverserK )�iterable�elementr r r � _chain_from_iterable_of_lists, 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 rQ r r r r r� 8 s r� c s~ e Zd Zddd�Zdd� Zdd� Zd d � Zd d � Zd d� Ze j jj e_ ddd�� fdd� Z ddd�dd�Z e j j j e _ � ZS )�ProcessPoolExecutorNr c C sJ t � |du r6t�� pd| _tjdkrntt| j�| _n8|dkrHtd��n tjdkrh|tkrhtdt� ���|| _|du r~t � � }|| _ | j j dd�d k| _ |dur�t|�s�td ��|| _|| _d| _i | _d| _t�� | _t�d�| _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_none�forkz initializer must be a callable)rF rB rC rD r# T))r� rk � cpu_count� _max_workers�sys�platform�min�_MAX_WINDOWS_WORKERSr� r � get_context� _mp_context�get_start_method�#_safe_to_dynamically_spawn_children�callable� TypeError� _initializer� _initargs�_executor_manager_threadr| r� � threading�Lockrx � Semaphorer� r� � _queue_countr� r� r rw �EXTRA_QUEUED_CALLSrA r~ � _ignore_epipe� SimpleQueuer r� r r� )r � max_workers� mp_contextrn ro � queue_sizer r r r @ sZ � ��� � z ProcessPoolExecutor.__init__c C s< | j d u r8| js| �� t| �| _ | j �� | jt| j < d S r )r� r� �_launch_processesrs �startrw r r r r r � _start_executor_manager_thread� s �z2ProcessPoolExecutor._start_executor_manager_threadc C s2 | j jdd�rd S t| j�}|| jk r.| �� d S )NF)�blocking)r� �acquire�lenr| r� �_spawn_process)r � process_countr r r �_adjust_process_count� s z)ProcessPoolExecutor._adjust_process_countc C s2 | j rJ d��tt| j�| j�D ] }| �� q d 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)�targetr9 ) r� �Processrr r~ r r� r� r� r| �pidr� r r r r� � s ��z"ProcessPoolExecutor._spawn_processc O s� | j �� | jrt| j��| jr&td��tr2td��t�� }t||||�}|| j | j < | j � | j � | j d7 _ | j �� | jr�| �� | �� |W d � S 1 s�0 Y d S )Nz*cannot schedule new futures after shutdownz6cannot schedule new futures after interpreter shutdownr& )rx r� r� r� � RuntimeErrorr r �Futurer6 r� r� r� ra rw r r� r� r� )r r8 r9 r: �f�wr r r �submit� s" zProcessPoolExecutor.submitr& )�timeoutrW c s: |dk rt d��t� 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.rW )r� )r� rE �mapr r_ r[ r� )r r8 r� rW rX �resultsrG r r r� � s �zProcessPoolExecutor.mapTF)�cancel_futuresc C s� | j �0 || _d| _| jd ur(| j�� W d � n1 s<0 Y | jd ur^|r^| j�� d | _d | _| jd ur�|r�| j� � d | _d | _ d | _d S r ) rx r� r� rw 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 �ExecutorrQ r� r� rR r r rG r r� ? s � U r� )NN)1rQ � __author__rk �concurrent.futuresr r� �multiprocessingr �multiprocessing.connection�multiprocessing.queuesr r� ry � functoolsr rU r� r. �WeakKeyDictionaryr r r r% �_register_atexitr� r� � Exceptionr( r, r3 �objectr6 r< r@ rA r[ r_ rd rr �Threadrs r� r� r� r� �BrokenExecutorr� r� r� r r r r �<module> sP * )