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\P�@sbdZdZddlZddlZddlmZddlZddlmZddlZddlm Z ddl
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d�de�ZGdd�d�Zdd�ZGdd�de�ZGdd�de�ZGdd�de�Zdd�Zdd�Z dd�Z!dd �Z"d!d"�Z#d a$da%d#d$�Z&d%d&�Z'Gd'd(�d(e(�Z)Gd)d*�d*ej*�Z+ej,e�dS)+a* 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 "Result Q"
z"Brian Quinlan (brian@sweetapp.com)�N)�_base)�Full)�SimpleQueue)�wait)�partialFcCsJdattj��}x|D]\}}|jd�qWx|D]\}}|j�q2WdS)NT)� _shutdown�list�_threads_queues�items�put�join)r
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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
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work_ids: A queue.Queue of work ids e.g. Queue([5, 6, ...]). Work ids
are consumed and the corresponding _WorkItems from
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call_queue: A multiprocessing.Queue that will be filled with _CallItems
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a�Manages the communication between this process and the worker processes.
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process: A list of the multiprocessing.Process instances used as
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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
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�|SQRXdS)NzKA child process terminated abruptly, the process pool is not usable anymorez*cannot schedule new futures after shutdownr)rxrVrWrI�RuntimeErrorrZFuturer$rzryrtrrsr�)rr&r'r(�f�wrrr�submit�szProcessPoolExecutor.submitr)�timeoutr2cs:|dkrtd��t�jtt|�t|d|i�|d�}t|�S)ajReturns an iterator equivalent to map(fn, iter).
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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
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Raises:
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Exception: If fn(*args) raises for any values.
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