new directio module

[oaitmous]

BPO	1545275
Nosy	@loewis
Files	directio.patch: patch v1

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2006-08-25.00:24:59.000>
created_at = <Date 2006-08-23.13:12:09.000>
labels = ['extension-modules']
title = 'new directio module'
updated_at = <Date 2006-08-25.00:24:59.000>
user = 'https://bugs.python.org/oaitmous'

bugs.python.org fields:

activity = <Date 2006-08-25.00:24:59.000>
actor = 'loewis'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2006-08-23.13:12:09.000>
creator = 'oaitmous'
dependencies = []
files = ['7497']
hgrepos = []
issue_num = 1545275
keywords = ['patch']
message_count = 2.0
messages = ['50980', '50981']
nosy_count = 2.0
nosy_names = ['loewis', 'oaitmous']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1545275'
versions = []

[oaitmous]

This module is an interface to the
open(),read(),write() and close() system calls on a
Direct I/O context (O_DIRECT flag to the open() system
call).
The O_DIRECT flag allows to open a file in "direct"
mode -- effectively bypassing the buffer-cache. This
behaviour is generally not a good thing since it will
strongly degrade performances, but it can be desirable
for some purposes (benchmark, or optimized read of many
concurrent video streams, for instance). A special
interface is needed, since the read() system calls
requires aligned buffers when used on O_DIRECT file
descriptors. And since the flag O_DIRECT is not
available with the os module, we decided to write this
module.

We would like to know if this is worth for inclusion
in the standard Python distribution? What should be
modified to make it more "compliant" to the python
rules? This file will probably need to be updated to
conform to python style standards.

[loewis]

Logged In: YES
user_id=21627

The major problem with this module is that it is LGPL; for inclusion in the
library, a contribution form to the PSF would be required and your license be
changed.

In any case, it's not clear what the applicability of this specialized API is. My
suggestion would be to package it up with distutils and put it on the
Cheeseshop (cheeseshop.python.org). When there is an established user
base, and demand that it be included in the standard distribution, inclusion
should be discussed on python-dev.