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Issue #12102: Document that buffered files must be flushed before being used

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with mmap. Patch by Steffen Daode Nurpmeso.
This commit is contained in:
Ross Lagerwall 2011-07-25 07:12:43 +02:00
parent 749400a94d
commit 59c01edcaa
3 changed files with 10 additions and 0 deletions
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6
Doc/library/mmap.rst
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@ -21,6 +21,12 @@ file object, use its :meth:`fileno` method to obtain the correct value for the
:func:`os.open` function, which returns a file descriptor directly (the file
still needs to be closed when done).
.. note::
If you want to create a memory-mapping for a writable, buffered file, you
should :func:`~io.IOBase.flush` the file first. This is necessary to ensure
that local modifications to the buffers are actually available to the
mapping.
For both the Unix and Windows versions of the constructor, *access* may be
specified as an optional keyword parameter. *access* accepts one of three
values: :const:`ACCESS_READ`, :const:`ACCESS_WRITE`, or :const:`ACCESS_COPY`