[Python-Dev] requirements for moving __import__ over to importlib?

[Tres Seaver]

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On 02/10/2012 04:42 PM, Brett Cannon wrote:
> On Fri, Feb 10, 2012 at 16:29, Tres Seaver <tseaver at palladion.com>
> wrote:
> 
>> On 02/10/2012 03:38 PM, Brett Cannon wrote:
>>> Changes in any fashion to the directory. Do filesystems
>>> atomically update the mtime of a directory when they commit a
>>> change? Otherwise we have a potential race condition.
>> 
>> Hmm, maybe I misundersand you.  In POSIX land, the only thing which 
>> changes the mtime of a directory is linking / unlinking / renaming
>> a file:  changes to individual files aren't detectable by examining
>> their containing directory's stat().
>> 
> 
> Individual file changes are not important; either the module is
> already in sys.modules so no attempt is made to detect a change or it
> hasn't been loaded and so it will have to be read regardless. All I'm
> asking is whether filesystems typically update the filesystem for a
> e.g. file deletion atomically with the mtime for the containing
> directory or not.

In POSIX land, most certainly.


Tres.
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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