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bpo-40611: Adds MAP_POPULATE to the mmap library #20061

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Merged
vstinner merged 8 commits into from
May 26, 2020
Merged

bpo-40611: Adds MAP_POPULATE to the mmap library #20061

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3b4ac22
Add MAP_POPULATE. Issue 40611.
EthanSteinberg May 13, 2020
5c268cd
📜🤖 Added by blurb_it.
blurb-it[bot] May 13, 2020
6df0464
Update docs
EthanSteinberg May 15, 2020
adac6af
Merge remote branch 'origin/map_populate' into map_populate
EthanSteinberg May 15, 2020
e31571c
Update Doc/library/mmap.rst
EthanSteinberg May 19, 2020
fb3dafe
Fix formatting
EthanSteinberg May 21, 2020
88817bf
Minor fix
EthanSteinberg May 21, 2020
ce19ec4
Update Misc/NEWS.d/next/Library/2020-05-13-16-28-33.bpo-40611.ZCk0_c.rst
EthanSteinberg May 22, 2020
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22 changes: 21 additions & 1 deletion Doc/library/mmap.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -81,7 +81,9 @@ To map anonymous memory, -1 should be passed as the fileno along with the length
private copy-on-write mapping, so changes to the contents of the mmap
object will be private to this process, and :const:`MAP_SHARED` creates a
mapping that's shared with all other processes mapping the same areas of
the file. The default value is :const:`MAP_SHARED`.
the file. The default value is :const:`MAP_SHARED`. Some systems have
additional possible flags with the full list specified in
:ref:`MAP_* constants <map-constants>`.

*prot*, if specified, gives the desired memory protection; the two most
useful values are :const:`PROT_READ` and :const:`PROT_WRITE`, to specify
Expand Down Expand Up @@ -342,3 +344,21 @@ MADV_* Constants
Availability: Systems with the madvise() system call.

.. versionadded:: 3.8

.. _map-constants:

MAP_* Constants
+++++++++++++++

.. data:: MAP_SHARED
MAP_PRIVATE
MAP_DENYWRITE
MAP_EXECUTABLE
MAP_ANON
MAP_ANONYMOUS
MAP_POPULATE

These are the various flags that can be passed to :meth:`mmap.mmap`. Note that some options might not be present on some systems.

.. versionchanged:: 3.10
Added MAP_POPULATE constant.
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2020-05-13-16-28-33.bpo-40611.ZCk0_c.rst
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@@ -0,0 +1 @@
:data:`~mmap.MAP_POPULATE` constant has now been added to the list of exported :mod:`mmap` module flags.
3 changes: 3 additions & 0 deletions Modules/mmapmodule.c
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Expand Up @@ -1574,6 +1574,9 @@ PyInit_mmap(void)
setint(dict, "MAP_ANON", MAP_ANONYMOUS);
setint(dict, "MAP_ANONYMOUS", MAP_ANONYMOUS);
#endif
#ifdef MAP_POPULATE
setint(dict, "MAP_POPULATE", MAP_POPULATE);
#endif

setint(dict, "PAGESIZE", (long)my_getpagesize());

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