From 557a68789b97bf281aa7b7e96f083982c01a5f7e Mon Sep 17 00:00:00 2001 From: "Miss Islington (bot)" <31488909+miss-islington@users.noreply.github.com> Date: Fri, 19 Oct 2018 17:48:05 -0700 Subject: [PATCH] bpo-32798: Add restriction on the offset parameter for mmap.flush in the docs (GH-5621) Add restriction on the offset parameter for mmap.flush. Explain that ALLOCATIONGRANULARITY is the same as PAGESIZE in Unix. (cherry picked from commit 027664a3d5ebad575aafe5fcc572e3b05f7f24e5) Co-authored-by: Pablo Galindo --- Doc/library/mmap.rst | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/Doc/library/mmap.rst b/Doc/library/mmap.rst index ca09a6a3ca99..f0d2071593d2 100644 --- a/Doc/library/mmap.rst +++ b/Doc/library/mmap.rst @@ -65,7 +65,7 @@ To map anonymous memory, -1 should be passed as the fileno along with the length *offset* may be specified as a non-negative integer offset. mmap references will be relative to the offset from the beginning of the file. *offset* - defaults to 0. *offset* must be a multiple of the ALLOCATIONGRANULARITY. + defaults to 0. *offset* must be a multiple of the :const:`ALLOCATIONGRANULARITY`. .. class:: mmap(fileno, length, flags=MAP_SHARED, prot=PROT_WRITE|PROT_READ, access=ACCESS_DEFAULT[, offset]) @@ -94,8 +94,8 @@ To map anonymous memory, -1 should be passed as the fileno along with the length *offset* may be specified as a non-negative integer offset. mmap references will be relative to the offset from the beginning of the file. *offset* - defaults to 0. *offset* must be a multiple of the PAGESIZE or - ALLOCATIONGRANULARITY. + defaults to 0. *offset* must be a multiple of :const:`ALLOCATIONGRANULARITY` + which is equal to :const:`PAGESIZE` on Unix systems. To ensure validity of the created memory mapping the file specified by the descriptor *fileno* is internally automatically synchronized @@ -189,7 +189,8 @@ To map anonymous memory, -1 should be passed as the fileno along with the length use of this call there is no guarantee that changes are written back before the object is destroyed. If *offset* and *size* are specified, only changes to the given range of bytes will be flushed to disk; otherwise, the - whole extent of the mapping is flushed. + whole extent of the mapping is flushed. *offset* must be a multiple of the + :const:`PAGESIZE` or :const:`ALLOCATIONGRANULARITY`. **(Windows version)** A nonzero value returned indicates success; zero indicates failure. -- 2.47.3