On Thu, 12 Mar 2009 at 17:01, Jim Jewett wrote:
On 3/12/09, "Martin v. L?wis" <mar...@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?

A less confusing name for your proposed parameter :)

Maybe 'reliability'?

_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())

(To be honest, I'm not even seeing why it couldn't be done in
Objects/fileobject.c, though I realize extension modules would need to
go through the python interface to take advantage of it.)
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