Redirecting output from running proc doesn't modify the "last modified time" field for target file

[ajshower <ajshower at gmail dot com>]

I've got a bash script running in Cygwin whose output has been redirected to
another file.  MS-DOS exhibits this same behavior if I run the bash script
as a batch job.

    bash.exe &> log.txt

Adding content to log.txt through redirection does not change log.txt's last
modified time while bash.exe is executing.  

Baseline:
    # ls -la --full-time log.txt
    -r-xr-x---+ 1 user Domain Users 66455 2011-11-30 16:16:45.246664800
-0500 log.txt

Some time later:
    # ls -la --full-time log.txt
    -r-xr-x---+ 1 user Domain Users 66838 2011-11-30 16:16:45.246664800
-0500 log.txt

Note that even though log.txt has gotten larger, the last modified time has
not changed.  The last modified time is updated only when bash.exe
terminates.

Ubuntu 11.04 handles this scenario, IMO, correctly.  Is there a way I can
get the last modified time to be updated when the content of the file
changes and while bash.exe is executing?

Cygwin:  CYGWIN_NT-6.1  
MS-DOS:  Microsoft Windows [Version 6.1.7601]

Thanks
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