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| author | Ross Lagerwall <rosslagerwall@gmail.com> | 2011-07-25 05:12:43 (GMT) |
|---|---|---|
| committer | Ross Lagerwall <rosslagerwall@gmail.com> | 2011-07-25 05:12:43 (GMT) |
| commit | 59c01edcaa4a973e159d2ed3a5084936d3fffa18 (patch) | |
| tree | d4ea70ea2ad7cdfea73ce8ae9942c6a92b3980dd /Doc/library | |
| parent | 749400a94d78bb714a8964c21f8979ab6b070708 (diff) | |
| download | cpython-59c01edcaa4a973e159d2ed3a5084936d3fffa18.zip cpython-59c01edcaa4a973e159d2ed3a5084936d3fffa18.tar.gz cpython-59c01edcaa4a973e159d2ed3a5084936d3fffa18.tar.bz2 | |
Issue #12102: Document that buffered files must be flushed before being used
with mmap. Patch by Steffen Daode Nurpmeso.
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/mmap.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst index 7a901c9..6a74a14 100644 --- a/Doc/library/mmap.rst +++ b/Doc/library/mmap.rst @@ -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` |