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# SOME DESCRIPTIVE TITLE.
# Copyright (C) 2001-2025, Python Software Foundation
# This file is distributed under the same license as the Python package.
# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
# Translators:
# python-doc bot, 2025
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#: ../../library/concurrent.futures.rst:2
msgid ":mod:`concurrent.futures` --- Launching parallel tasks"
#: ../../library/concurrent.futures.rst:9
"**Source code:** :source:`Lib/concurrent/futures/thread.py` and "
":source:`Lib/concurrent/futures/process.py`"
#: ../../library/concurrent.futures.rst:14
"The :mod:`concurrent.futures` module provides a high-level interface for "
"asynchronously executing callables."
#: ../../library/concurrent.futures.rst:17
"The asynchronous execution can be performed with threads, using "
":class:`ThreadPoolExecutor`, or separate processes, using "
":class:`ProcessPoolExecutor`.  Both implement the same interface, which is "
"defined by the abstract :class:`Executor` class."
#: ../../library/concurrent.futures.rst:24
msgid "Executor Objects"
#: ../../library/concurrent.futures.rst:28
"An abstract class that provides methods to execute calls asynchronously.  It"
" should not be used directly, but through its concrete subclasses."
#: ../../library/concurrent.futures.rst:33
"Schedules the callable, *fn*, to be executed as ``fn(*args, **kwargs)`` and "
"returns a :class:`Future` object representing the execution of the callable."
#: ../../library/concurrent.futures.rst:43
msgid "Similar to :func:`map(func, *iterables) <map>` except:"
#: ../../library/concurrent.futures.rst:45
msgid "the *iterables* are collected immediately rather than lazily;"
#: ../../library/concurrent.futures.rst:47
"*func* is executed asynchronously and several calls to *func* may be made "
"concurrently."
#: ../../library/concurrent.futures.rst:50
"The returned iterator raises a :exc:`concurrent.futures.TimeoutError` if "
":meth:`~iterator.__next__` is called and the result isn't available after "
"*timeout* seconds from the original call to :meth:`Executor.map`. *timeout* "
"can be an int or a float.  If *timeout* is not specified or ``None``, there "
"is no limit to the wait time."
#: ../../library/concurrent.futures.rst:56
"If a *func* call raises an exception, then that exception will be raised "
"when its value is retrieved from the iterator."
#: ../../library/concurrent.futures.rst:59
"When using :class:`ProcessPoolExecutor`, this method chops *iterables* into "
"a number of chunks which it submits to the pool as separate tasks.  The "
"(approximate) size of these chunks can be specified by setting *chunksize* "
"to a positive integer.  For very long iterables, using a large value for "
"*chunksize* can significantly improve performance compared to the default "
"size of 1.  With :class:`ThreadPoolExecutor`, *chunksize* has no effect."
#: ../../library/concurrent.futures.rst:67
msgid "Added the *chunksize* argument."
#: ../../library/concurrent.futures.rst:72
"Signal the executor that it should free any resources that it is using when "
"the currently pending futures are done executing.  Calls to "
":meth:`Executor.submit` and :meth:`Executor.map` made after shutdown will "
"raise :exc:`RuntimeError`."
#: ../../library/concurrent.futures.rst:77
"If *wait* is ``True`` then this method will not return until all the pending"
" futures are done executing and the resources associated with the executor "
"have been freed.  If *wait* is ``False`` then this method will return "
"immediately and the resources associated with the executor will be freed "
"when all pending futures are done executing.  Regardless of the value of "
"*wait*, the entire Python program will not exit until all pending futures "
"are done executing."
#: ../../library/concurrent.futures.rst:85
"If *cancel_futures* is ``True``, this method will cancel all pending futures"
" that the executor has not started running. Any futures that are completed "
"or running won't be cancelled, regardless of the value of *cancel_futures*."
#: ../../library/concurrent.futures.rst:90
"If both *cancel_futures* and *wait* are ``True``, all futures that the "
"executor has started running will be completed prior to this method "
"returning. The remaining futures are cancelled."
#: ../../library/concurrent.futures.rst:94
"You can avoid having to call this method explicitly if you use the "
":keyword:`with` statement, which will shutdown the :class:`Executor` "
"(waiting as if :meth:`Executor.shutdown` were called with *wait* set to "
"``True``)::"
#: ../../library/concurrent.futures.rst:106
msgid "Added *cancel_futures*."
#: ../../library/concurrent.futures.rst:111
msgid "ThreadPoolExecutor"
#: ../../library/concurrent.futures.rst:113
":class:`ThreadPoolExecutor` is an :class:`Executor` subclass that uses a "
"pool of threads to execute calls asynchronously."
#: ../../library/concurrent.futures.rst:116
"Deadlocks can occur when the callable associated with a :class:`Future` "
"waits on the results of another :class:`Future`.  For example::"
#: ../../library/concurrent.futures.rst:135
msgid "And::"
#: ../../library/concurrent.futures.rst:149
"An :class:`Executor` subclass that uses a pool of at most *max_workers* "
"threads to execute calls asynchronously."
#: ../../library/concurrent.futures.rst:152
"*initializer* is an optional callable that is called at the start of each "
"worker thread; *initargs* is a tuple of arguments passed to the initializer."
"  Should *initializer* raise an exception, all currently pending jobs will "
"raise a :exc:`~concurrent.futures.thread.BrokenThreadPool`, as well as any "
"attempt to submit more jobs to the pool."
#: ../../library/concurrent.futures.rst:158
"If *max_workers* is ``None`` or not given, it will default to the number of "
"processors on the machine, multiplied by ``5``, assuming that "
":class:`ThreadPoolExecutor` is often used to overlap I/O instead of CPU work"
" and the number of workers should be higher than the number of workers for "
":class:`ProcessPoolExecutor`."
#: ../../library/concurrent.futures.rst:166
"The *thread_name_prefix* argument was added to allow users to control the "
":class:`threading.Thread` names for worker threads created by the pool for "
"easier debugging."
#: ../../library/concurrent.futures.rst:171
#: ../../library/concurrent.futures.rst:265
msgid "Added the *initializer* and *initargs* arguments."
#: ../../library/concurrent.futures.rst:174
"Default value of *max_workers* is changed to ``min(32, os.cpu_count() + "
"4)``. This default value preserves at least 5 workers for I/O bound tasks. "
"It utilizes at most 32 CPU cores for CPU bound tasks which release the GIL. "
"And it avoids using very large resources implicitly on many-core machines."
#: ../../library/concurrent.futures.rst:180
"ThreadPoolExecutor now reuses idle worker threads before starting "
"*max_workers* worker threads too."
#: ../../library/concurrent.futures.rst:187
msgid "ThreadPoolExecutor Example"
#: ../../library/concurrent.futures.rst:219
msgid "ProcessPoolExecutor"
#: ../../library/concurrent.futures.rst:221
"The :class:`ProcessPoolExecutor` class is an :class:`Executor` subclass that"
" uses a pool of processes to execute calls asynchronously. "
":class:`ProcessPoolExecutor` uses the :mod:`multiprocessing` module, which "
"allows it to side-step the :term:`Global Interpreter Lock <global "
"interpreter lock>` but also means that only picklable objects can be "
"executed and returned."
#: ../../library/concurrent.futures.rst:228
"The ``__main__`` module must be importable by worker subprocesses. This "
"means that :class:`ProcessPoolExecutor` will not work in the interactive "
"interpreter."
#: ../../library/concurrent.futures.rst:231
"Calling :class:`Executor` or :class:`Future` methods from a callable "
"submitted to a :class:`ProcessPoolExecutor` will result in deadlock."
#: ../../library/concurrent.futures.rst:236
"An :class:`Executor` subclass that executes calls asynchronously using a "
"pool of at most *max_workers* processes.  If *max_workers* is ``None`` or "
"not given, it will default to the number of processors on the machine. If "
"*max_workers* is less than or equal to ``0``, then a :exc:`ValueError` will "
"be raised. On Windows, *max_workers* must be less than or equal to ``61``. "
"If it is not then :exc:`ValueError` will be raised. If *max_workers* is "
"``None``, then the default chosen will be at most ``61``, even if more "
"processors are available. *mp_context* can be a multiprocessing context or "
"None. It will be used to launch the workers. If *mp_context* is ``None`` or "
"not given, the default multiprocessing context is used."
#: ../../library/concurrent.futures.rst:249
"*initializer* is an optional callable that is called at the start of each "
"worker process; *initargs* is a tuple of arguments passed to the "
"initializer.  Should *initializer* raise an exception, all currently pending"
" jobs will raise a :exc:`~concurrent.futures.process.BrokenProcessPool`, as "
"well as any attempt to submit more jobs to the pool."
#: ../../library/concurrent.futures.rst:255
"When one of the worker processes terminates abruptly, a "
":exc:`BrokenProcessPool` error is now raised.  Previously, behaviour was "
"undefined but operations on the executor or its futures would often freeze "
"or deadlock."
#: ../../library/concurrent.futures.rst:261
"The *mp_context* argument was added to allow users to control the "
"start_method for worker processes created by the pool."
#: ../../library/concurrent.futures.rst:271
msgid "ProcessPoolExecutor Example"
#: ../../library/concurrent.futures.rst:309
msgid "Future Objects"
#: ../../library/concurrent.futures.rst:311
"The :class:`Future` class encapsulates the asynchronous execution of a "
"callable. :class:`Future` instances are created by :meth:`Executor.submit`."
#: ../../library/concurrent.futures.rst:316
"Encapsulates the asynchronous execution of a callable.  :class:`Future` "
"instances are created by :meth:`Executor.submit` and should not be created "
"directly except for testing."
#: ../../library/concurrent.futures.rst:322
"Attempt to cancel the call.  If the call is currently being executed or "
"finished running and cannot be cancelled then the method will return "
"``False``, otherwise the call will be cancelled and the method will return "
"``True``."
#: ../../library/concurrent.futures.rst:329
msgid "Return ``True`` if the call was successfully cancelled."
#: ../../library/concurrent.futures.rst:333
"Return ``True`` if the call is currently being executed and cannot be "
"cancelled."
#: ../../library/concurrent.futures.rst:338
"Return ``True`` if the call was successfully cancelled or finished running."
#: ../../library/concurrent.futures.rst:343
"Return the value returned by the call. If the call hasn't yet completed then"
" this method will wait up to *timeout* seconds.  If the call hasn't "
"completed in *timeout* seconds, then a "
":exc:`concurrent.futures.TimeoutError` will be raised. *timeout* can be an "
"int or float.  If *timeout* is not specified or ``None``, there is no limit "
"to the wait time."
#: ../../library/concurrent.futures.rst:350
#: ../../library/concurrent.futures.rst:364
"If the future is cancelled before completing then :exc:`.CancelledError` "
"will be raised."
#: ../../library/concurrent.futures.rst:353
"If the call raised an exception, this method will raise the same exception."
#: ../../library/concurrent.futures.rst:357
"Return the exception raised by the call.  If the call hasn't yet completed "
"then this method will wait up to *timeout* seconds.  If the call hasn't "
"completed in *timeout* seconds, then a "
":exc:`concurrent.futures.TimeoutError` will be raised.  *timeout* can be an "
"int or float.  If *timeout* is not specified or ``None``, there is no limit "
"to the wait time."
#: ../../library/concurrent.futures.rst:367
msgid "If the call completed without raising, ``None`` is returned."
#: ../../library/concurrent.futures.rst:371
"Attaches the callable *fn* to the future.  *fn* will be called, with the "
"future as its only argument, when the future is cancelled or finishes "
#: ../../library/concurrent.futures.rst:375
"Added callables are called in the order that they were added and are always "
"called in a thread belonging to the process that added them.  If the "
"callable raises an :exc:`Exception` subclass, it will be logged and ignored."
"  If the callable raises a :exc:`BaseException` subclass, the behavior is "
"undefined."
#: ../../library/concurrent.futures.rst:381
"If the future has already completed or been cancelled, *fn* will be called "
"immediately."
#: ../../library/concurrent.futures.rst:384
"The following :class:`Future` methods are meant for use in unit tests and "
":class:`Executor` implementations."
#: ../../library/concurrent.futures.rst:389
"This method should only be called by :class:`Executor` implementations "
"before executing the work associated with the :class:`Future` and by unit "
#: ../../library/concurrent.futures.rst:393
"If the method returns ``False`` then the :class:`Future` was cancelled, i.e."
" :meth:`Future.cancel` was called and returned `True`.  Any threads waiting "
"on the :class:`Future` completing (i.e. through :func:`as_completed` or "
":func:`wait`) will be woken up."
#: ../../library/concurrent.futures.rst:398
"If the method returns ``True`` then the :class:`Future` was not cancelled "
"and has been put in the running state, i.e. calls to :meth:`Future.running` "
"will return `True`."
#: ../../library/concurrent.futures.rst:402
"This method can only be called once and cannot be called after "
":meth:`Future.set_result` or :meth:`Future.set_exception` have been called."
#: ../../library/concurrent.futures.rst:408
"Sets the result of the work associated with the :class:`Future` to *result*."
#: ../../library/concurrent.futures.rst:411
#: ../../library/concurrent.futures.rst:424
"This method should only be used by :class:`Executor` implementations and "
"unit tests."
#: ../../library/concurrent.futures.rst:414
#: ../../library/concurrent.futures.rst:427
"This method raises :exc:`concurrent.futures.InvalidStateError` if the "
":class:`Future` is already done."
#: ../../library/concurrent.futures.rst:421
"Sets the result of the work associated with the :class:`Future` to the "
":class:`Exception` *exception*."
#: ../../library/concurrent.futures.rst:433
msgid "Module Functions"
#: ../../library/concurrent.futures.rst:437
"Wait for the :class:`Future` instances (possibly created by different "
":class:`Executor` instances) given by *fs* to complete. Duplicate futures "
"given to *fs* are removed and will be returned only once. Returns a named "
"2-tuple of sets.  The first set, named ``done``, contains the futures that "
"completed (finished or cancelled futures) before the wait completed.  The "
"second set, named ``not_done``, contains the futures that did not complete "
"(pending or running futures)."
#: ../../library/concurrent.futures.rst:445
"*timeout* can be used to control the maximum number of seconds to wait "
"before returning.  *timeout* can be an int or float.  If *timeout* is not "
"specified or ``None``, there is no limit to the wait time."
#: ../../library/concurrent.futures.rst:449
"*return_when* indicates when this function should return.  It must be one of"
" the following constants:"
#: ../../library/concurrent.futures.rst:455
msgid "Constant"
msgstr "常量"
#: ../../library/concurrent.futures.rst:455
msgid "Description"
msgstr "描述"
#: ../../library/concurrent.futures.rst:457
msgid ":const:`FIRST_COMPLETED`"
#: ../../library/concurrent.futures.rst:457
msgid "The function will return when any future finishes or is cancelled."
#: ../../library/concurrent.futures.rst:460
msgid ":const:`FIRST_EXCEPTION`"
#: ../../library/concurrent.futures.rst:460
"The function will return when any future finishes by raising an exception.  "
"If no future raises an exception then it is equivalent to "
":const:`ALL_COMPLETED`."
#: ../../library/concurrent.futures.rst:466
msgid ":const:`ALL_COMPLETED`"
#: ../../library/concurrent.futures.rst:466
msgid "The function will return when all futures finish or are cancelled."
#: ../../library/concurrent.futures.rst:472
"Returns an iterator over the :class:`Future` instances (possibly created by "
"different :class:`Executor` instances) given by *fs* that yields futures as "
"they complete (finished or cancelled futures). Any futures given by *fs* "
"that are duplicated will be returned once. Any futures that completed before"
" :func:`as_completed` is called will be yielded first.  The returned "
"iterator raises a :exc:`concurrent.futures.TimeoutError` if "
":meth:`~iterator.__next__` is called and the result isn't available after "
"*timeout* seconds from the original call to :func:`as_completed`.  *timeout*"
" can be an int or float. If *timeout* is not specified or ``None``, there is"
" no limit to the wait time."
#: ../../library/concurrent.futures.rst:486
msgid ":pep:`3148` -- futures - execute computations asynchronously"
#: ../../library/concurrent.futures.rst:486
"The proposal which described this feature for inclusion in the Python "
"standard library."
#: ../../library/concurrent.futures.rst:491
msgid "Exception classes"
#: ../../library/concurrent.futures.rst:497
msgid "Raised when a future is cancelled."
#: ../../library/concurrent.futures.rst:501
msgid "Raised when a future operation exceeds the given timeout."
#: ../../library/concurrent.futures.rst:505
"Derived from :exc:`RuntimeError`, this exception class is raised when an "
"executor is broken for some reason, and cannot be used to submit or execute "
"new tasks."
#: ../../library/concurrent.futures.rst:513
"Raised when an operation is performed on a future that is not allowed in the"
" current state."
#: ../../library/concurrent.futures.rst:522
"Derived from :exc:`~concurrent.futures.BrokenExecutor`, this exception class"
" is raised when one of the workers of a :class:`ThreadPoolExecutor` has "
"failed initializing."
#: ../../library/concurrent.futures.rst:532
"Derived from :exc:`~concurrent.futures.BrokenExecutor` (formerly "
":exc:`RuntimeError`), this exception class is raised when one of the workers"
" of a :class:`ProcessPoolExecutor` has terminated in a non-clean fashion "
"(for example, if it was killed from the outside)."
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