[Python-Dev] wait time [was: Ext4 data loss]

Tino Wildenhain tino at wildenhain.de
Thu Mar 12 22:35:48 CET 2009

Jim Jewett wrote:
> On 3/12/09, "Martin v. Löwis" <martin at v.loewis.de> wrote:
>>> It is starting to look as though flush (and close?) should take an
>>> optional wait parameter, to indicate how much re-assurance you're
>>> willing to wait for.
>> Unfortunately, such a thing would be unimplementable on most of today's
>> operating systems.
> What am I missing?
> _file=file
> class file(_file): ...
>     def flush(self, wait=0):
>         super().flush(self)
>         if wait < 0.25:
>             return
>         if wait < 0.5 and os.fdatasync:
>             os.fdatasync(self.fileno())
>             return
>         os.fsync(self.fileno())
>         if wait < 0.75:
>             return
>         if os.ffullsync:
>             os.ffullsync(self.fileno())

What would be wrong with just making the f*sync calls
methods of the file object and that's about it?

alternatively when flush() should get an optional argument,
I'd call it sync and use a set of predefined and meaningful
constants (and no floating point value).

Just my 2ct.


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