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bpo-31854: Added mmap.ACCESS_DEFAULT to namespace. #4093

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Merged
vstinner merged 1 commit into from
Nov 7, 2017
Merged

bpo-31854: Added mmap.ACCESS_DEFAULT to namespace. #4093

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24 changes: 14 additions & 10 deletions Doc/library/mmap.rst
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Expand Up @@ -29,16 +29,20 @@ still needs to be closed when done).
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`
to specify read-only, write-through or copy-on-write memory respectively.
*access* can be used on both Unix and Windows. If *access* is not specified,
Windows mmap returns a write-through mapping. The initial memory values for
all three access types are taken from the specified file. Assignment to an
:const:`ACCESS_READ` memory map raises a :exc:`TypeError` exception.
Assignment to an :const:`ACCESS_WRITE` memory map affects both memory and the
underlying file. Assignment to an :const:`ACCESS_COPY` memory map affects
memory but does not update the underlying file.
specified as an optional keyword parameter. *access* accepts one of four
values: :const:`ACCESS_READ`, :const:`ACCESS_WRITE`, or :const:`ACCESS_COPY` to
specify read-only, write-through or copy-on-write memory respectively, or
:const:`ACCESS_DEFAULT` to defer to *prot*. *access* can be used on both Unix
and Windows. If *access* is not specified, Windows mmap returns a
write-through mapping. The initial memory values for all three access types
are taken from the specified file. Assignment to an :const:`ACCESS_READ`
memory map raises a :exc:`TypeError` exception. Assignment to an
:const:`ACCESS_WRITE` memory map affects both memory and the underlying file.
Assignment to an :const:`ACCESS_COPY` memory map affects memory but does not
update the underlying file.

.. versionchanged:: 3.7
Added :const:`ACCESS_DEFAULT` constant.

To map anonymous memory, -1 should be passed as the fileno along with the length.

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2017-10-23.bpo-31854.fh8334f.rst
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@@ -0,0 +1 @@
Add ``mmap.ACCESS_DEFAULT`` constant.
1 change: 1 addition & 0 deletions Modules/mmapmodule.c
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Expand Up @@ -1466,6 +1466,7 @@ PyInit_mmap(void)

setint(dict, "ALLOCATIONGRANULARITY", (long)my_getallocationgranularity());

setint(dict, "ACCESS_DEFAULT", ACCESS_DEFAULT);
setint(dict, "ACCESS_READ", ACCESS_READ);
setint(dict, "ACCESS_WRITE", ACCESS_WRITE);
setint(dict, "ACCESS_COPY", ACCESS_COPY);
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