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#: ../Doc/library/multiprocessing.shared_memory.rst:2
msgid ""
":mod:`multiprocessing.shared_memory` ---  Provides shared memory for direct "
"access across processes"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:7
msgid "**Source code:** :source:`Lib/multiprocessing/shared_memory.py`"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:18
msgid ""
"This module provides a class, :class:`SharedMemory`, for the allocation and "
"management of shared memory to be accessed by one or more processes on a "
"multicore or symmetric multiprocessor (SMP) machine.  To assist with the "
"life-cycle management of shared memory especially across distinct processes, "
"a :class:`~multiprocessing.managers.BaseManager` subclass, :class:"
"`SharedMemoryManager`, is also provided in the ``multiprocessing.managers`` "
"module."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:26
msgid ""
"In this module, shared memory refers to \"System V style\" shared memory "
"blocks (though is not necessarily implemented explicitly as such) and does "
"not refer to \"distributed shared memory\".  This style of shared memory "
"permits distinct processes to potentially read and write to a common (or "
"shared) region of volatile memory.  Processes are conventionally limited to "
"only have access to their own process memory space but shared memory permits "
"the sharing of data between processes, avoiding the need to instead send "
"messages between processes containing that data.  Sharing data directly via "
"memory can provide significant performance benefits compared to sharing data "
"via disk or socket or other communications requiring the serialization/"
"deserialization and copying of data."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:41
msgid ""
"Creates a new shared memory block or attaches to an existing shared memory "
"block.  Each shared memory block is assigned a unique name. In this way, one "
"process can create a shared memory block with a particular name and a "
"different process can attach to that same shared memory block using that "
"same name."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:47
msgid ""
"As a resource for sharing data across processes, shared memory blocks may "
"outlive the original process that created them.  When one process no longer "
"needs access to a shared memory block that might still be needed by other "
"processes, the :meth:`close()` method should be called. When a shared memory "
"block is no longer needed by any process, the :meth:`unlink()` method should "
"be called to ensure proper cleanup."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:54
msgid ""
"*name* is the unique name for the requested shared memory, specified as a "
"string.  When creating a new shared memory block, if ``None`` (the default) "
"is supplied for the name, a novel name will be generated."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:58
msgid ""
"*create* controls whether a new shared memory block is created (``True``) or "
"an existing shared memory block is attached (``False``)."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:61
msgid ""
"*size* specifies the requested number of bytes when creating a new shared "
"memory block.  Because some platforms choose to allocate chunks of memory "
"based upon that platform's memory page size, the exact size of the shared "
"memory block may be larger or equal to the size requested.  When attaching "
"to an existing shared memory block, the ``size`` parameter is ignored."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:69
msgid ""
"Closes access to the shared memory from this instance.  In order to ensure "
"proper cleanup of resources, all instances should call ``close()`` once the "
"instance is no longer needed.  Note that calling ``close()`` does not cause "
"the shared memory block itself to be destroyed."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:77
msgid ""
"Requests that the underlying shared memory block be destroyed.  In order to "
"ensure proper cleanup of resources, ``unlink()`` should be called once (and "
"only once) across all processes which have need for the shared memory "
"block.  After requesting its destruction, a shared memory block may or may "
"not be immediately destroyed and this behavior may differ across platforms.  "
"Attempts to access data inside the shared memory block after ``unlink()`` "
"has been called may result in memory access errors.  Note: the last process "
"relinquishing its hold on a shared memory block may call ``unlink()`` and :"
"meth:`close()` in either order."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:90
msgid "A memoryview of contents of the shared memory block."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:94
msgid "Read-only access to the unique name of the shared memory block."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:98
msgid "Read-only access to size in bytes of the shared memory block."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:101
msgid ""
"The following example demonstrates low-level use of :class:`SharedMemory` "
"instances::"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:127
msgid ""
"The following example demonstrates a practical use of the :class:"
"`SharedMemory` class with `NumPy arrays <https://www.numpy.org/>`_, "
"accessing the same ``numpy.ndarray`` from two distinct Python shells:"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:181
msgid ""
"A subclass of :class:`~multiprocessing.managers.BaseManager` which can be "
"used for the management of shared memory blocks across processes."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:184
msgid ""
"A call to :meth:`~multiprocessing.managers.BaseManager.start` on a :class:"
"`SharedMemoryManager` instance causes a new process to be started. This new "
"process's sole purpose is to manage the life cycle of all shared memory "
"blocks created through it.  To trigger the release of all shared memory "
"blocks managed by that process, call :meth:`~multiprocessing.managers."
"BaseManager.shutdown()` on the instance. This triggers a :meth:`SharedMemory."
"unlink()` call on all of the :class:`SharedMemory` objects managed by that "
"process and then stops the process itself.  By creating ``SharedMemory`` "
"instances through a ``SharedMemoryManager``, we avoid the need to manually "
"track and trigger the freeing of shared memory resources."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:196
msgid ""
"This class provides methods for creating and returning :class:`SharedMemory` "
"instances and for creating a list-like object (:class:`ShareableList`) "
"backed by shared memory."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:200
msgid ""
"Refer to :class:`multiprocessing.managers.BaseManager` for a description of "
"the inherited *address* and *authkey* optional input arguments and how they "
"may be used to connect to an existing ``SharedMemoryManager`` service from "
"other processes."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:207
msgid ""
"Create and return a new :class:`SharedMemory` object with the specified "
"``size`` in bytes."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:212
msgid ""
"Create and return a new :class:`ShareableList` object, initialized by the "
"values from the input ``sequence``."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:216
msgid ""
"The following example demonstrates the basic mechanisms of a :class:"
"`SharedMemoryManager`:"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:234
msgid ""
"The following example depicts a potentially more convenient pattern for "
"using :class:`SharedMemoryManager` objects via the :keyword:`with` statement "
"to ensure that all shared memory blocks are released after they are no "
"longer needed:"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:253
msgid ""
"When using a :class:`SharedMemoryManager` in a :keyword:`with` statement, "
"the shared memory blocks created using that manager are all released when "
"the :keyword:`with` statement's code block finishes execution."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:260
msgid ""
"Provides a mutable list-like object where all values stored within are "
"stored in a shared memory block.  This constrains storable values to only "
"the ``int``, ``float``, ``bool``, ``str`` (less than 10M bytes each), "
"``bytes`` (less than 10M bytes each), and ``None`` built-in data types. It "
"also notably differs from the built-in ``list`` type in that these lists can "
"not change their overall length (i.e. no append, insert, etc.) and do not "
"support the dynamic creation of new :class:`ShareableList` instances via "
"slicing."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:269
msgid ""
"*sequence* is used in populating a new ``ShareableList`` full of values. Set "
"to ``None`` to instead attach to an already existing ``ShareableList`` by "
"its unique shared memory name."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:273
msgid ""
"*name* is the unique name for the requested shared memory, as described in "
"the definition for :class:`SharedMemory`.  When attaching to an existing "
"``ShareableList``, specify its shared memory block's unique name while "
"leaving ``sequence`` set to ``None``."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:280
msgid "Returns the number of occurrences of ``value``."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:284
msgid ""
"Returns first index position of ``value``.  Raises :exc:`ValueError` if "
"``value`` is not present."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:289
msgid ""
"Read-only attribute containing the :mod:`struct` packing format used by all "
"currently stored values."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:294
msgid "The :class:`SharedMemory` instance where the values are stored."
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:297
msgid ""
"The following example demonstrates basic use of a :class:`ShareableList` "
"instance:"
msgstr ""

#: ../Doc/library/multiprocessing.shared_memory.rst:330
msgid ""
"The following example depicts how one, two, or many processes may access the "
"same :class:`ShareableList` by supplying the name of the shared memory block "
"behind it:"
msgstr ""
